Patent Grant
8840695
1. Field of the Disclosure
The following is directed to shaped abrasive particles, and more particularly, to shaped abrasive particles having certain features and methods of forming such shaped abrasive particles.
2. Description of the Related Art
Abrasive articles incorporating abrasive particles are useful for various material removal operations including grinding, finishing, polishing, and the like. Depending upon the type of abrasive material, such abrasive particles can be useful in shaping or grinding various materials in the manufacturing of goods. Certain types of abrasive particles have been formulated to date that have particular geometries, such as triangular shaped abrasive particles and abrasive articles incorporating such objects. See, for example, U.S. Pat. Nos. 5,201,916; 5,366,523; and 5,984,988.
Previously, three basic technologies that have been employed to produce abrasive particles having a specified shape, which are fusion, sintering, and chemical ceramic. In the fusion process, abrasive particles can be shaped by a chill roll, the face of which may or may not be engraved, a mold into which molten material is poured, or a heat sink material immersed in an aluminum oxide melt. See, for example, U.S. Pat. No. 3,377,660. In sintering processes, abrasive particles can be formed from refractory powders having a particle size of up to 10 micrometers in diameter. Binders can be added to the powders along with a lubricant and a suitable solvent to form a mixture that can be shaped into platelets or rods of various lengths and diameters. See, for example, U.S. Pat. No. 3,079,242. Chemical ceramic technology involves converting a colloidal dispersion or hydrosol (sometimes called a sol) to a gel or any other physical state that restrains the mobility of the components, drying, and firing to obtain a ceramic material. See, for example, U.S. Pat. Nos. 4,744,802 and 4,848,041.
The industry continues to demand improved abrasive materials and abrasive articles.
According to a first aspect, a method of forming a shaped abrasive particle comprises forming a mixture comprising a ceramic material into a sheet, sectioning at least a portion of the sheet with a mechanical object, and forming a shaped abrasive particle from the mixture, wherein the shaped abrasive particle comprises a two-dimensional shape as viewed in a plane defined by a length and a width of the shaped abrasive particle selected from the group consisting of polygons, ellipsoids, numerals, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, complex shapes having a combination of polygonal shapes, and a combination thereof.
In a second aspect, a particulate material comprises a batch of shaped abrasive particles comprising a first type of shaped abrasive particle comprising a length (l), a width (w), and a height (h), wherein the first type of shaped abrasive particle comprises a first polygonal shape as viewed in a plane defined by the length and width, a second type of shaped abrasive particle comprising a length (l), a width (w), and a height (h), wherein the second type of shaped abrasive particle comprises a second polygonal shape as viewed in a plane defined by the length and width, the second polygonal shape different than the first polygonal shape.
According to a third aspect, a particulate material comprises a shaped abrasive particle having a body comprising a corner-truncated polygonal shape including a first long side, a second long side, and a first short side disposed between the first long side and second long side having a length shorter than the first long side and shorter than the second long side, and a first angle between the first short side and the first long side greater than 90°.
In another aspect, a coated abrasive article includes a substrate, a first type of abrasive particulate material coupled to the substrate having a body comprising a length (l), a width (w), and a height (h), the first type of abrasive particulate material having a first polygonal shape as viewed in a plane defined by the length and width and a second type of shaped abrasive particle coupled to the substrate having a body comprising a length (l), a width (w), and a height (h), the second type of abrasive particulate material having a second polygonal shape as viewed in a plane defined by the length and width different than the first polygonal shape.
For another aspect, a particulate material includes a shaped abrasive particle having a body and including a first major surface, a second major surface, and a side surface extending between the first and second major surfaces, wherein the side surface has a ripple feature.
In yet another aspect, a batch of particulate material includes a first portion having a first type of shaped abrasive particle and a second portion including a second type of shaped abrasive particle having a body defining a length (l), a width (w), and a height (h), wherein the second type of shaped abrasive particle is different than the first type and includes a corner-truncated shape.
According to one aspect, a particulate material includes a shaped abrasive particle having a body including a first major surface, a second major surface, and at least one side surface extending between the first major surface and the second major surface, wherein the side surface has a fractured region intersecting at least a portion of an edge defining the second major surface.
In yet another aspect, a method of forming a shaped abrasive particle comprises forming a mixture comprising a ceramic material into a sheet, sectioning at least a portion of the sheet with a mechanical object, and maintaining the opening in the sheet after sectioning and forming a precursor shaped abrasive particle.
The present disclosure may be better understood, and its numerous features and advantages made apparent to those skilled in the art by referencing the accompanying drawings.
The following is directed to methods of forming shaped abrasive particles and features of such shaped abrasive particles. The shaped abrasive particles may be used in various abrasive articles, including for example bonded abrasive articles, coated abrasive articles, and the like. Alternatively, the shaped abrasive particles of the embodiments herein may be utilized in free abrasive technologies, including for example grinding and/or polishing slurries.
The mixture 101 can be formed to have a particular content of solid material, such as the ceramic powder material. For example, in one embodiment, the mixture 101 can have a solids content of at least about 25 wt %, such as at least about 35 wt %, at least about 38 wt %, or even at least about 42 wt % for the total weight of the mixture 101. Still, in at least one non-limiting embodiment, the solid content of the mixture 101 can be not greater than about 75 wt %, such as not greater than about 70 wt %, not greater than about 65 wt %, or even not greater than about 55 wt %. It will be appreciated that the content of the solids materials in the mixture 101 can be within a range between any of the minimum and maximum percentages noted above.
According to one embodiment, the ceramic powder material can include an oxide, a nitride, a carbide, a boride, an oxycarbide, an oxynitride, and a combination thereof. In particular instances, the ceramic material can include alumina. More specifically, the ceramic material may include a boehmite material, which may be a precursor of alpha alumina. The term “boehmite” is generally used herein to denote alumina hydrates including mineral boehmite, typically being Al2O3.H20 and having a water content on the order of 15%, as well as psuedoboehmite, having a water content higher than 15%, such as 20-38% by weight. It is noted that boehmite (including psuedoboehmite) has a particular and identifiable crystal structure, and accordingly unique X-ray diffraction pattern, and as such, is distinguished from other aluminons materials including other hydrated aluminas such as ATH (aluminum trihydroxide) a common precursor material used herein for the fabrication of boehmite particulate materials.
Furthermore, the mixture 101 can be formed to have a particular content of liquid material. Some suitable liquids may include organic materials, such as water. In accordance with one embodiment, the mixture 101 can be formed to have a liquid content less than the solids content of the mixture 101. In more particular instances, the mixture 101 can have a liquid content of at least about 25 wt % for the total weight of the mixture 101. In other instances, the amount of liquid within the mixture 101 can be greater, such as at least about 35 wt %, at least about 45 wt %, at least about 50 wt %, or even at least about 58 wt %. Still, in at least one non-limiting embodiment, the liquid content of the mixture can be not greater than about 75 wt %, such as not greater than about 70 wt %, not greater than about 65 wt %, not greater than about 60 wt %, or even not greater than about 55 wt %. It will be appreciated that the content of the liquid in the mixture 101 can be within a range between any of the minimum and maximum percentages noted above.
Furthermore, to facilitate processing and forming shaped abrasive particles according to embodiments herein, the mixture 101 can have a particular storage modulus. For example, the mixture 101 can have a storage modulus of at least about 1×104 Pa, such as at least about 4×104 Pa, or even at least about 5×104 Pa. However, in at least one non-limiting embodiment, the mixture 101 may have a storage modulus of not greater than about 1×107 Pa , such as not greater than about 1×106 Pa. It will be appreciated that the storage modulus of the mixture 101 can be within a range between any of the minimum and maximum values noted above. The storage modulus can be measured via a parallel plate system using ARES or AR-G2 rotational rheometers, with Peltier plate temperature control systems. For testing, the mixture 101 can be extruded within a gap between two plates that are set to be approximately 8 mm apart from each other. After extruding the get into the gap, the distance between the two plates defining the gap is reduced to 2 mm until the mixture 101 completely fills the gap between the plates. After wiping away excess mixture, the gap is decreased by 0.1 mm and the test is initiated. The test is an oscillation strain sweep test conducted with instrument settings of a strain range between 0.1% to 100%, at 6.28 rad/s (1 Hz), using 25-mm parallel plate and recording 10 points per decade. Within 1 hour after the test completes, lower the gap again by 0.1 mm and repeat the test. The test can be repeated at least 6 times. The first test may differ from the second and third tests. Only the results from the second and third tests for each specimen should be reported. The viscosity can be calculated by dividing the storage modulus value by 6.28 s-1.
Furthermore, to facilitate processing and forming shaped abrasive particles according to embodiments herein, the mixture 101 can have a particular viscosity. For example, the mixture 101 can have a viscosity of at least about 4×103 Pa s, at least about 5×103 Pa s, at least about 6×103 Pa s, at least about 8×103 Pa s, at least about 10×103 Pa s, at least about 20×103 Pa s, at least about 30×103 Pa s, at least about 40×103 Pa s, at least about 50×103 Pa s, at least about 60×103 Pa s, or even at least about 65×103 Pa s. In at least one non-limiting embodiment, the mixture 101 may have a viscosity of not greater than about 1×106 Pa s, not greater than about 5×105 Pa s, not greater than about 3×105 Pa s, or even not greater than about 2×105 Pa s. It will be appreciated that the viscosity of the mixture 101 can be within a range between any of the minimum and maximum values noted above.
Moreover, the mixture 101 can be formed to have a particular content of organic materials, including for example, organic additives that can be distinct from the liquid, to facilitate processing and formation of shaped abrasive particles according to the embodiments herein. Some suitable organic additives can include stabilizers, binders, such as fructose, sucrose, lactose, glucose, UV curable resins, and the like.
Notably, the embodiments herein may utilize a mixture 101 that is distinct from slurries used in conventional tape casting operations. For example, the content of organic materials within the mixture 101, particularly, any of the organic additives noted above may be a minor amount as compared to other components within the mixture 101. In at least one embodiment, the mixture 101 can be formed to have not greater than about 30 wt % organic material for the total weight of the mixture 101. In other instances, the amount of organic materials may be less, such as not greater than about 15 wt %, not greater than about 10 wt %, or even not greater than about 5 wt %. Still, in at least one non-limiting embodiment, the amount of organic materials within the mixture 101 can be at least about 0.1 wt %, such as at least about 0.5 wt % for the total weight of the mixture 101. It will be appreciated that the amount of organic materials in the mixture 101 can be within a range between any of the minimum and maximum values noted above.
Moreover, the mixture 101 can be formed to have a particular content of acid or base distinct from the liquid, to facilitate processing and formation of shaped abrasive particles according to the embodiments herein. Some suitable acids or bases can include nitric acid, sulfuric acid, citric acid, chloric acid, tartaric acid, phosphoric acid, ammonium nitrate, ammonium citrate. According to one particular embodiment, the mixture 101 can have a pH of less than about 5, and more particularly, within a range between about 2 and about 4, using a nitric acid additive.
Referencing
In certain systems, the die 103 can include a die opening 105 having a particular shape. It will be appreciated that the die opening 105 may be shaped to impart a particular shape to the mixture 101 during extrusion. In accordance with an embodiment, the die opening 105 can have a rectangular shape. Furthermore, the mixture 101 extruded through the die opening 105 can have essentially the same cross-sectional shape as the die opening 105. As further illustrated, the mixture 101 may be extruded in the form of a sheet 111 and onto a belt 109 underlying the die 103. In specific instances, the mixture 101 can be extruded in the form of a sheet 111 directly onto the belt 109, which may facilitate continuous processing.
According to one particular embodiment, the belt can be formed to have a film overlying a substrate, wherein the film can be a discrete and separate layer of material configured to facilitate processing and forming of shaped abrasive particles. The process can include providing the mixture 101 directly onto the film of the belt to form the sheet 111. In certain instances, the film can include a polymer material, such as polyester. In at least one particular embodiment, the film can consist essentially of polyester.
In some embodiments, the belt 109 can be translated while moving the mixture 101 through the die opening 105. As illustrated in the system 100, the mixture 101 may be extruded in a direction 191. The direction of translation 110 of the belt 109 can be angled relative to the direction of extrusion 191 of the mixture. While the angle between the direction of translation 110 and the direction of extrusion 191 are illustrated as substantially orthogonal in the system 100, other angles are contemplated, including for example, an acute angle or an obtuse angle. Moreover, while the mixture 101 is illustrated as being extruded in a direction 191, which is angled relative to the direction of translation 110 of the belt 109, in an alternative embodiment, the belt 109 and mixture 101 may be extruded in substantially the same direction.
The belt 109 may be translated at a particular rate to facilitate processing. For example, the belt 109 may be translated at a rate of at least about 3 cm/s. In other embodiments, the rate of translation of the belt 109 may be greater, such as at least about 4 cm/s, at least about 6 cm/s, at least about 8 cm/s, or even at least about 10 cm/s. Still, in at least one non-limiting embodiment, the belt 109 may be translated in a direction 110 at a rate of not greater than about 5 m/s, not greater than about 1 m/s, or even not greater than about 0.5 m/s. It will be appreciated that the screen 151 may be translated at a rate within a range between any of the minimum and maximum values noted above.
For certain processes according to embodiments herein, the rate of translation of the belt 109 as compared to the rate of extrusion of the mixture 101 in the direction 191 may be controlled to facilitate proper processing. For example, the rate of translation of the belt 109 can be essentially the same as the rate of extrusion to ensure formation of a suitable sheet 111.
After the mixture 101 is extruded through the die opening 105, the mixture 101 may be translated along the belt 109 under a knife edge 107 attached to a surface of the die 103. The knife edge 107 may facilitate forming a sheet 111. More particularly, the opening defined between the surface of the knife edge 107 and belt 109 may define particular dimensions of the extruded mixture 101. For certain embodiments, the mixture 101 may be extruded in the form of a sheet 111 having a generally rectangular cross-sectional shape as viewed in a plane defined by a height and width of the sheet 111. While the extrudate is illustrated as a sheet, other shapes can be extruded, including for example cylindrical shapes and the like.
The process of forming the sheet 111 from the mixture 101 can include control of particular features and process parameters to facilitate suitable formation of shaped abrasive particles having one or more features as provided in the embodiments herein. For example, in certain instances, the process of forming a sheet 111 from the mixture 101 can include forming a sheet 111 having a particular height 181 controlled in part by a distance between the knife edge 107 and a surface of the belt 109. Moreover, it is noted that the height 181 of the sheet 111 can be controlled by varying a distance between the knife edge 107 and the surface of the belt 109. Additionally, forming the mixture 101 into the sheet 111 can include controlling the dimensions of the sheet 111 based in part upon the viscosity of the mixture 101. In particular, forming the sheet 111 can include adjusting the height 181 of the sheet 111 based on the viscosity of the mixture 101.
Furthermore, to facilitate processing and forming shaped abrasive particles according to embodiments herein, the mixture 101, and thus the sheet 111, can have a particular viscosity. For example, the mixture 101 can have a viscosity of at least about 4×103 Pa s, at least about 5×103 Pa s, at least about 6×103 Pa s, at least about 8×103 Pa s, at least about 10×103 Pa s, at least about 20×103 Pa s, at least about 30×103 Pa s, at least about 40×103 Pa s, at least about 50×103 Pa s, at least about 60×103 Pa s, or even at least about 65×103 Pa s. In at least one non-limiting embodiment, the mixture 101 may have a viscosity of not greater than about 1×106 Pa s, not greater than about 5×105 Pa s, not greater than about 3×105 Pa s, or even not greater than about 2×105 Pa s. It will be appreciated that the viscosity of the mixture 101 can be within a range between any of the minimum and maximum values noted above. The viscosity can be measured in the same manner as the storage modulus as described above.
The sheet 11 can have particular dimensions, including for example a length (l), a width (w), and a height (h). In accordance with an embodiment, the sheet 111 may have a length that extends in the direction of the translating belt 109, which can be greater than the width, wherein the width of the sheet 111 is a dimension extending in a direction perpendicular to the length of the belt 109 and to the length of the sheet. The sheet 111 can have a height 181, wherein the length and width are greater than the height 181 of the sheet 111.
Notably, the height 181 of the sheet 111 can be the dimension extending vertically from the surface of the belt 109. In accordance with an embodiment, the sheet 111 can be formed to have a particular dimension of height 181, wherein the height may be an average height of the sheet 111 derived from multiple measurements. For example, the height 181 of the sheet 111 can be at least about 0.1 mm, such as at least about 0.5 mm. In other instances, the height 181 of the sheet 111 can be greater, such as at least about 0.8 mm, at least about 1 mm, at least about 1.2 mm, at least about 1.6 mm, or even at least about 2 mm. Still, in one non-limiting embodiment, the height 181 of the sheet 111 may be not greater than about 10 mm, not greater than about 5 mm, or even not greater than about 2 mm. It will be appreciated that the sheet 111 may have an average height within a range between any of the minimum and maximum values noted above.
According to one embodiment, the sheet 111 can have a length (l), a width (w), and a height (h), wherein the length≧width≧height. Moreover, the sheet 111 can have a secondary aspect ratio of length:height of at least about 10, such as at least about 100, at least about 1000, or even at least about 1000.
After extruding the mixture 101 from the die 103, the sheet 111 may be translated in a direction 112 along the surface of the belt 109. Translation of the sheet 111 along the belt 109 may facilitate further processing to form precursor shaped abrasive particles. For example, the sheet 111 may undergo a shaping process within the shaping zone 113. In particular instances, the process of shaping can include shaping a surface of the sheet 111, including for example, an upper major surface 117 of the sheet 111. In other embodiments, other major surfaces of the sheet may undergo shaping, including for example, the bottom surface or side surfaces. For certain processes, shaping can include altering a contour of the sheet through one or more processes, such as, embossing, rolling, cutting, engraving, patterning, stretching, twisting, and a combination thereof.
In one particular embodiment, the process of shaping can include forming a feature 119 in the upper major surface 117 of the sheet 111. More particularly, a shaping structure 115 may be contacted to the upper major surface 117 of the sheet 111 facilitating the formation of a feature 119 or a pattern of features in the upper major surface 117. It will be appreciated that the shaping structure 115 can take various forms, including for example, a roller having various features on its surface, wherein such features may be imparted to the upper major surface 117 of the sheet 111 upon contact between the shaping structure 115 and the upper major surface 117.
Still, it will be appreciated that alternative shaping structures and methods of shaping a sheet may be utilized. For example, the surface of the belt 109 may be textured such that features of the texture are imparted to the sheet 111, and the finally-formed shaped abrasive particles. Moreover, various devices may be used to impart a feature or pattern of features on the side surfaces of the sheet 111.
In accordance with an embodiment, the process of forming a shaped abrasive particle can further include translation of the sheet along the belt 109 through a forming zone 121. In accordance with an embodiment, the process of forming a shaped abrasive particle can include sectioning the sheet 111 to form precursor shaped abrasive particles 123. For example, in certain instances, forming can include perforating a portion of the sheet 111. In other instances, the process of forming can include patterning the sheet 111 to form a patterned sheet and extracting shapes from the patterned sheet.
Particular processes of forming can include cutting, pressing, punching, crushing, rolling, twisting, bending, drying, and a combination thereof. In one embodiment, the process of forming can include sectioning of the sheet 111. Sectioning of the sheet 111 can include the use of at least one mechanical object, which may be in the form of a gas, liquid, or solid material. The process of sectioning can include at least one or a combination of cutting, pressing, punching, crushing, rolling, twisting, bending, and drying. Moreover, it will be appreciated that sectioning can include perforating or creating a partial opening through a portion of the sheet 111, which may not extend through the entire height of the sheet 111.
For example, sectioning can include a water jet cutting process. In another embodiment, sectioning of the sheet 111 can include use of a mechanical object including one or a plurality of a blade, a wire, a disc, and a combination thereof. The blades may be oriented relative to each other in a variety of configurations to achieve the desired sectioning. For example, the blades may be arranged parallel to each other, such as in a gang configuration. Alternatively, the mechanical object may include a set of spiral blades connected to each other or independent of each other.
Alternatively, the process of forming shaped abrasive particles can include the use of radiation to section the sheet 111 into discrete precursor shaped abrasive particles. For example, use of radiation may include the use of a laser to score or otherwise cut discrete shaped abrasive particles from the sheet 111.
It will be appreciated that at least one blade may be translated through the sheet 111 to facilitate sectioning. In particular instances, a sectioning process using a blade can include translating a blade in multiple directions including a first direction, and a second direction different than the first direction through the sheet 111. More notably, certain sectioning processes may utilize a plurality of blades that can be translated across and through the sheet 111 in multiple directions to facilitate the formation of precursor shaped abrasive particles 123.
The process of sectioning can create different types of shaped abrasive particles in a single sectioning process. Different types of shaped abrasive particles can be formed from the same processes of the embodiments herein. Different types of shaped abrasive particles include a first type of shaped abrasive particle having a first two-dimensional shape and a second type of shaped abrasive particle having a different two-dimensional shape as compared to the first two-dimensional shape. Furthermore, different types of shaped abrasive particles may differ from each other in size. For example, different types of shaped abrasive particles may have different volumes as compared to each other. A single process which is capable of forming different types of shaped abrasive particles may be particularly suited for producing certain types of abrasive articles.
As further illustrated, upon sectioning of the sheet 111 with a cutting device 201, a plurality of precursor shaped abrasive particles may be formed in the sheet 111. In particular instances, as illustrated in
Furthermore, the sectioning process may form another type of precursor shaped abrasive particles 243 approximate to, and even abutting, the edge of the sheet 111. The precursor shaped abrasive particles 243 can have a triangular two-dimensional shape as viewed in a plane defined by the length (l) and width (w) of the sheet 111. However, the precursor shaped abrasive particles 243 can be smaller in size as compared to the precursor shaped abrasive particles 240. In particular instances, the precursor shaped abrasive particles 243 can have a volume that is not greater than about 95% of the volume of the precursor shaped abrasive particles 240. Volume may be an average value calculated by the measurement of volume for at least 20 shaped abrasive particles of the same type. In other instances, the precursor shaped abrasive particles 243 can have a volume that is not greater than about 92%, not greater than about 90%, not greater than about 85%, such as not greater than about 80%, not greater than about 75%, not greater than about 60%, or even not greater than about 50% of the volume of the precursor shaped abrasive particles 240. Still, in one non-limiting embodiment, the precursor shaped abrasive particles 243 can have a volume that is at least about 10%, such as at least about 20%, at least about 30%, or even at least about 40% of the volume of the precursor shaped abrasive particles 240. The difference in volume between the precursor shaped abrasive particles 243 and precursor shaped abrasive particles 240 can be within a range between any of the minimum and maximum percentages noted above.
Another type of precursor shaped abrasive particles 242 may be formed in the same sectioning process used to form the precursor shaped abrasive particles 240 and 243 from the sheet 111. Notably, the precursor shaped abrasive particles 242 can have a quadrilateral two-dimensional shape as viewed in a plane defined by the width (w) and length (l) of the sheet 111. According to one particular embodiment, the precursor shaped abrasive particles 242 may have a two-dimensional shape of a parallelogram. It will be appreciated that the precursor shaped abrasive particles 242 can have a difference in volume as compared to the other precursor shaped abrasive particles as described in other embodiments herein.
The sectioning process may create another type of shaped abrasive particle 244 used to form the precursor shaped abrasive particles 240, 242, and 243 from the same sheet 111. Notably, the precursor shaped abrasive particles 244 can have a different two-dimensional polygonal shape as compared to the precursor shaped abrasive particles 240, 242, or 243. As illustrated in the embodiment of
Sectioning can include moving the mechanical object through a portion of a sheet 111 and creating an opening within the sheet 111. Referring briefly to
In certain instances, the method of sectioning can include maintaining the opening 415 in the sheet 111. Maintaining the opening 415 after sectioning the sheet 111 has been sectioned by a mechanical object may facilitate suitable formation of shaped abrasive particles and features of shaped abrasive particles and features of a batch of shaped abrasive particles. Maintaining the opening 415 can include at least partially drying at least one surface of the sheet 111 defining the opening 415, including for example, one of the surfaces 416 and 417. The process of at least partially drying can include directing a drying material at the opening 415. A drying material may include a liquid, a solid, or even a gas. According to one particular embodiment, the drying material can include air.
Furthermore, the process of maintaining the opening 415 can include selectively directing a drying material, such as a gas, at the opening 415 and limiting the impingement of gas on other surfaces of the sheet 111, such as the surfaces 418 and 419 substantially spaced apart from the opening 415.
In certain instances, the process of sectioning can be conducted prior to sufficient drying of the sheet. For example, sectioning can be conducted prior to volatilization of not greater than about 20% of the liquid from the sheet 111 as compared to the original liquid content of the sheet during initial formation of the sheet 111. In other embodiments, the amount of volatilization allowed to occur before or during sectioning can be less, such as, not greater than about 15%, not greater than about 12%, not greater than about 10%, not greater than about 8%, or even not greater than about 4% of the original liquid content of the sheet.
As indicated by the description of embodiments herein, sectioning can be conducted simultaneously with the process of forming. Moreover, sectioning can be conducted continuously during the process of forming. Sectioning may not necessarily include a change in composition to the sheet, such as in the case of ablation processes, which rely upon vaporization.
According to one embodiment, sectioning can be conducted at particular conditions to facilitate the forming process. For example, sectioning can be conducted at controlled sectioning conditions including at least one of a controlled humidity, a controlled temperature, a controlled air pressure, a controlled air flow, a controlled environmental gas composition, and a combination thereof. Control of such conditions may facilitate control of the drying of the sheet and facilitate formation of shaped abrasive particles having particular features. According to a particular embodiment, sectioning can include monitoring and control of one or more certain environmental conditions, including but not limited to humidity, temperature, air pressure, air flow, environmental gas composition, and a combination thereof,
For at least one embodiment, the temperature of the environment used for sectioning (i.e., sectioning temperature) that can be controlled relative to the temperature of the environment used in other processes. For example, the sectioning temperature can be conducted at a substantially different temperature as compared to the temperature used during forming (e.g., extruding) of the sheet. Alternatively, the temperature used during forming of the sheet can be substantially the same as the sectioning temperature. Moreover, in another embodiment, the mechanical object can have a temperature greater than a temperature of the sheet 111 during sectioning. In an alternative condition, the mechanical object can have a temperature less than a temperature of the sheet 111.
For another aspect, the process of sectioning can include providing at least one opening agent to an opening formed in the sheet 111 after sectioning, wherein the opening agent is sufficient to maintain an opening in the sheet after sectioning. Some suitable methods of providing the opening agent can include depositing, coating, spraying, printing, rolling, transferring, and a combination thereof. In one particular embodiment, the mechanical object can be coated with a least one opening agent, wherein the opening agent can be transferred from a surface of the mechanical object to a surface of the sheet defining the opening. The opening agent can include a material selected from the group of inorganic materials, organic materials, polymers, and a combination thereof. In one embodiment, the opening agent may be a foaming agent, surfactant, and a combination thereof.
Referring again to
In one embodiment, the post-forming zone 125 includes a heating process, wherein the precursor shaped abrasive particles 123 may be dried. Drying may include removal of a particular content of material, including volatiles, such as water. In accordance with an embodiment, the drying process can be conducted at a drying temperature of not greater than 300° C. such as not greater than 280° C. or even not greater than about 250° C. Still, in one non-limiting embodiment, the drying process may be conducted at a drying temperature of at least 50° C. It will be appreciated that the drying temperature may be within a range between any of the minimum and maximum temperatures noted above.
Furthermore, the precursor shaped abrasive particles 123 may be translated through a post-forming zone at a particular rate, such as at least about 0.2 feet/min and not greater than about 8 feet/min. Furthermore, the drying process may be conducted for a particular duration. For example, the drying process may be not greater than about six hours.
After the precursor shaped abrasive particles 123 are translated through the post-forming zone 125, the particles may be removed from the belt 109. The precursor shaped abrasive particles 123 may be collected in a bin 127 for further processing.
In accordance with an embodiment, the process of forming shaped abrasive particles may further comprise a sintering process. The sintering process can be conducted after collecting the precursor shaped abrasive particles 123 from the belt 109. Sintering of the precursor shaped abrasive particles 123 may be utilized to densify the particles, which are generally in a green state. In a particular instance, the sintering process can facilitate the formation of a high-temperature phase of the ceramic material. For example, in one embodiment, the precursor shaped abrasive particles 123 may be sintered such that a high-temperature phase of alumina, such as alpha alumina is formed. In one instance, a shaped abrasive particle can comprise at least about 90 wt % alpha alumina for the total weight of the particle. In other instances, the content of alpha alumina may be greater, such that the shaped abrasive particle may consist essentially of alpha alumina.
The body of the shaped abrasive particles may include additives, such as dopants, which may be in the form of elements or compounds (e.g., oxides). Certain suitable additives can include alkali elements, alkaline earth elements, rare-earth elements, hafnium (Hf), zirconium (Zr), niobium (Nb), tantalum (Ta), molybdenum (Mo), and a combination thereof. In particular instances, the additive can include an element such as lithium (Li), sodium (Na), potassium (K), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), scandium (Sc), yttrium (Y), lanthanum (La), cesium (Ce), praseodymium (Pr), niobium (Nb), hafnium (Hf), zirconium (Zr), tantalum (Ta), molybdenum (Mo), vanadium (V), chromium (Cr), cobalt (Co), iron (Fe), germanium (Ge), manganese (Mn), nickel (Ni), titanium (Ti), zinc (Zn), and a combination thereof.
The body of a shaped abrasive article may include a specific content of additive (e.g., dopant). For example, the body of a shaped abrasive particle may include not greater than about 12 wt % additive for the total weight of the body. In still other embodiments, they amount of additive may be less, such as not greater than about 11 wt %, not greater than about 10 wt %, not greater than about 9 wt %, not greater than about 8 wt %, not greater than about 7 wt %, not greater than about 6 wt %, or even not greater than about 5 wt %. Still, the amount of additive in at least one non-limiting embodiment can be at least about 0.5 wt %, such as at least about 1 wt %, at least about 1.3 wt %, at least about 1.8 wt %, at least about 2 wt %, at least about 2.3 wt %, at least about 2.8 wt %, or even at least about 3 wt %. It will be appreciated that the amount of additive within a body of a shaped abrasive particle may be within a range between any of the minimum and maximum percentages noted above.
While the process illustrated in the system 100 has described a shaping process conducted in a shaping zone 113 followed by a forming process at the forming zone 121, and a post-forming process in a post-forming zone, other orders of the processes and zones are contemplated. For example, the process of shaping a surface of the sheet 111 can be conducted after a forming process. In still other instances, the forming process may be completed during the forming process, such that the forming process and shaping process are completed simultaneously. Moreover, while certain processes have been illustrated as being integral with a belt translation system, any of the processes described herein may be completed independent of each other and the belt translation system.
The shaped abrasive particles of the embodiments herein can have a body defined by a length (l), a width (w), and a height (h). The body can include a width (w) that is the longest dimension of the body and extending along a side of the particle. The body may further include a length (l) that can be a dimension extending through a portion of the body, such as the midpoint, or alternatively, may be a dimension extending between particular points on the outer surface of the body (e.g., between opposing corners). It will be appreciated that the body can have a variety of length dimensions depending upon the points of reference. Additionally, the shaped abrasive particle can further include a height (h), which may be a dimension of the shaped abrasive particle extending in a direction substantially perpendicular to the length and width in a direction defined by a side surface of the body 301. Notably, as will be described in more detail herein, the body 301 can be defined by various heights depending upon the location on the body. In specific instances, the width can be greater than or equal to the length, the length can be greater than or equal to the height, and the width can be greater than or equal to the height.
Additionally, the body of a shaped abrasive particle of the embodiments herein can have various two-dimensional shapes. For example, the body can have a two-dimensional shape as viewed in a plane define by the length and width having a polygonal shape, ellipsoidal shape, a numeral, a Greek alphabet character, Latin alphabet character, Russian alphabet character, complex shapes utilizing a combination of polygonal shapes and a combination thereof. Particular polygonal shapes include triangular, rectangular, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon, any combination thereof.
Furthermore, the body 501 can have a secondary aspect ratio defined by a ratio of width:height. In certain instances, the secondary aspect ratio of the body 501 may be at least about 1.2:1, such as at least about 1.5:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, or even at least about 10:1. Still, in at least one non-limiting embodiment, the body 501 can have a secondary aspect ratio that is not greater than about 100:1. It will be appreciated that the secondary aspect ratio may be within a range between any of the minimum and maximum ratios provided above. The dimensions used to calculate the secondary aspect ratio may be based upon a median value of a batch of shaped abrasive particles. For example, the height can be based upon a median interior height for a batch of shaped abrasive particles.
Furthermore, the shaped abrasive particles of the embodiments herein can have a tertiary aspect ratio defined by a ratio of the length:height. In certain instances, the tertiary aspect ratio of the body 501 may be at least about 1.2:1, such as at least about 1.5:1, at least about 2:1, at least about 3:1, at least about 4:1, at least about 5:1, or even at least about 10:1. Still, in at least one non-limiting embodiment, the body 501 can have a tertiary aspect ratio that is not greater than about 100:1. It will be appreciated that the tertiary aspect ratio may be within a range between any of the minimum and maximum ratios provided above. The dimensions used to calculate the tertiary aspect ratio may be based upon a median value of a batch of shaped abrasive particles. For example, the height can be based upon a median interior height for a batch of shaped abrasive particles.
As illustrated, the body 701 can have a first angle 707 defined between the first long side 702 and first short side 705 as viewed at the upper major surface 730 of the body 701. In accordance with an embodiment, the first angle 707 can be greater than about 90°. In more particular instances, the first angle 707 can be at least about 92°, at least about 95°, at least about 100°, or even at least about 105°. Still, the first angle, in one non-limiting embodiment, can be not greater than about 160°.
The body can further include a second angle 708 formed between the first short side 705 and second long side 703 as viewed at the upper major surface 730 of the body 701. In accordance with an embodiment, the second angle 708 can be the same as the first angle 707. Still, in another embodiment, the second angle 708 can be different than the first angle 707. According to one instance, the second angle 708 can be obtuse. Alternatively, the second angle 708 may be greater than about 90°, and more particularly, at least about 92°, at least about 95°, at least about 100°, or even at least about 105°. Still, the second angle 708, in one non-limiting embodiment, can be not greater than about 160°.
As further illustrated, the body 701 of the shaped abrasive particle can include a third angle 709 defined as the angle between the second short side 706 and first long side 702 as viewed at the upper major surface 730 of the body 701. The third angle 709 may be the same as the first angle 707 or the second angle 708. Alternatively, the third angle 709 may be different than the first angle 707 and second angle 708.
The body 701 can also include a fourth angle 710 defined as the angle between the second short surface 706 and third long surface 704. The fourth angle 710 may be different than the first angle 707, second angle 708, or third angle 709. In particular instances, the fourth angle 710 can be less than the first angle 707, less than the second angle 708, or less than the third angle 709. In at least one particular embodiment, the fourth angle 710 may be substantially orthogonal (90°). In yet other instances, the fourth angle 710 may be greater than 90°.
The body 701 may further include a fifth angle 711 between the third long side 704 and second long side 703 as viewed top down looking at the upper major surface 730 of the body 701. Notably, the fifth angle 711 can be different than the first angle 707, the second angle 708, the third angle 709, or the fourth angle 710. In particular instances, the fifth angle 711 can be less than the first angle 707, less than the second angle 708, less than the third angle 709, or even less than the fourth angle 710. The fifth angle 711 can define the corner 722 of a triangle, and thus be less than about 90°, and more particularly less than about 70°. While the body 710 has been illustrated as having a first short side and a second short side 706, it will be appreciated that the body could incorporate a third short side separating the second long side and third long side 704.
In accordance with an embodiment, the first short side 705 can have a width 781 that is not greater than about 60% of a width of the first long side 702. In other embodiments, the width of the first short side 705 relative to the first long side 702 can be less, such as not greater than about 50%, or not greater than about 40%, not greater than about 30%, not greater than about 28%, or even not greater than about 25%. Still, the short side 705 can be at least about 2%, such as at least about 5%, at least about 10%, at least about 15%, or even at least about 20% of the width of the first long side 702. It will be appreciated that the width of the first short side 705 can be within a range between any of the minimum and maximum percentages noted above.
Moreover, the percentages noted above with respect to the width 781 of the first short side 705 relative to the width of longest side of the particle can be representative of median values for a batch. For example, a batch of shaped abrasive particles may include a content of corner-truncated shapes. The width of the corner-truncated portions can have a median value for the batch. The particles of the batch can also have a median width represented by the median dimension of the longest side of the particles of the batch, or at least the median dimension of the longest side of the particles from a representative sample of the batch. The batch can have a median corner-truncated width of not greater than about 50%, such as not greater than about 40%, not greater than about 30%, not greater than about 28%, or even not greater than about 25% of the median width of the particles of the batch. Still, the batch can include corner-truncated shapes, wherein the median width of the truncated corners can be at least about 2%, such as at least about 5%, at least about 10%, at least about 15%, or even at least about 20% of the median width of the particles. It will be appreciated that the median width of the truncated corners for particles of a batch can be within a range between any of the minimum and maximum percentages noted above.
Furthermore, it will be appreciated that the width of the second short side 706 can have the same characteristics of the first short side 705 relative to the first long side 702. Additionally, the width of the second short side 706 may differ with respect to the width of the first short side 705.
In accordance with an embodiment, the first long side 702 can have a width (w1) that is substantially equal to the width (w2) of the second long side 703. Still, the width (w1) of the first long side 702 may be significantly different than the width (w2) of the second long side 703. Moreover, the width (w1) of the first long side 702 may be substantially the same as the width (w3) of the third long side 704. Alternatively, the width (w1) of the first long side 702 may be significantly different that the width (w3) of the third long side 704. Additionally, the width (w2) of the second long side 703 may be substantially the same as the width (w3) of the third long side 704. Alternatively, the width (w2) of the second long side 703 may be significantly different than the width (w3) of the third long side 704.
Still, it will be appreciated that the foregoing is an example, and in other instances, the corner height of the body can be greater than the midpoint height. In particular instances, the body can have a midpoint/corner differential height within a range of any of the minimum and maximum values noted above for the corner/midpoint differential height.
Still, it will be appreciated that the foregoing is an example, and in other instances, the edge height of the body can be greater than the midpoint height. In particular instances, the body can have a midpoint/edge differential height within a range of any of the minimum and maximum values noted above for the edge/midpoint differential height.
The shaped abrasive particles of embodiments herein can have a particular size, as measured by the width of the body. For example, the shaped abrasive particles may have a median particle size of not greater than about 5 mm. Alternatively, the median particle may be less, such as not greater than about 4 mm, not greater than about 3 mm, not greater than about 2 mm, or even not greater than about 1.5 mm. In still another aspect, the median particle size of the shaped abrasive particles can be at least about 10 microns, at least about 100 microns, at least about 200 microns, at least about 400 microns, at least about 600 microns, or even at least about 800 microns. It will be appreciated that the median particle size of the shaped abrasive particles can be within a range between any of the above minimum and maximum values.
The shaped abrasive particles of embodiments herein can have a particular grain size, which can be a measure of crystalline grain size within the particle, particularly for grains of alpha alumina. For example, the shaped abrasive particles may have an average grain size of not greater than about 500 microns, such as not greater than about 250 microns, or even not greater than about 100 microns, not greater than about 50 microns, not greater than about 20 microns, or even not greater than about 1 micron. In another aspect, the average grain size can be at least about 0.01 microns, such as at least about 0.05 microns, at least about 0.08 microns, or even at least about 0.1 microns. It will be appreciated that the average grain size of the shaped abrasive particles can be within a range between any of the above minimum and maximum values.
As shown in
As shown, the first end face 1102 and the second end face 1104 can be parallel to each other and separated by the lateral faces 1106, 1108, 1110, and 1112, giving the body a cube-like structure. However, in a particular aspect, the first end face 1102 can be rotated with respect to the second end face 1104 to establish a twist angle 1114. In particular instances, the shaped abrasive particle 1100 can be formed from the processes described herein, including sectioning a sheet, and more particularly sectioning a sheet that has been torqued or twisted in a particular manner to impart a twist angle to the finally-formed shaped abrasive particle. In certain instances, the twist of the body 1101 can be along one or more axes and define particular types of twist angles. For example, as illustrated in a top-down view of the body in
In a particular aspect, the twist angle 1114 can be at least about 1°. In other instances, the twist angle 1114 can be greater, such as at least about 2°, at least about 5°, at least about 8°, at least about 10°, at least about 12°, at least about 15°, at least about 18°, at least about 20°, at least about 25°, at least about 30°, at least about 40°, at least about 50°, at least about 60°, at least about 70°, at least about 80°, or even at least about 90°. Still, according to certain embodiments, the twist angle 1114 can be not greater than about 360°, such as not greater than about 330°, such as not greater than about 300°, not greater than about 270°, not greater than about 230°, not greater than about 200°, or even not greater than about 180°. It will be appreciated that certain shaped abrasive particles can have a twist angle within a range between any of the minimum and maximum angles noted above.
According to one embodiment, the substrate 1401 can include an organic material, inorganic material, and a combination thereof. In certain instances, the substrate 1401 can include a woven material. However, the substrate 1401 may be made of a non-woven material. Particularly suitable substrate materials can include organic materials, including polymers, and particularly, polyester, polyurethane, polypropylene, polyimides such as KAPTON from DuPont, paper. Some suitable inorganic materials can include metals, metal alloys, and particularly, foils of copper, aluminum, steel, and a combination thereof.
The make coat 1403 can be applied to the surface of the substrate 1401 in a single process, or alternatively, the abrasive particulate materials 1405, 1406, 1407 can be combined with a make coat 1403 material and applied as a mixture to the surface of the substrate 1401. Suitable materials of the make coat 1403 can include organic materials, particularly polymeric materials, including for example, polyesters, epoxy resins, polyurethanes, polyamides, polyacrylates, polymethacrylates, poly vinyl chlorides, polyethylene, polysiloxane, silicones, cellulose acetates, nitrocellulose, natural rubber, starch, shellac, and mixtures thereof. In one embodiment, the make coat 1403 can include a polyester resin. The coated substrate can then be heated in order to cure the resin and the abrasive particulate material to the substrate. In general, the coated substrate 1401 can be heated to a temperature of between about 100 ° C. to less than about 250 ° C. during this curing process.
The abrasive particulate materials 1405, 1406, and 1407 can include different types of shaped abrasive particles according to embodiments herein. The different types of shaped abrasive particles can differ from each other in composition, two-dimensional shape, three-dimensional shape, size, and a combination thereof as described in the embodiments herein. As illustrated, the coated abrasive 1400 can include a first type of shaped abrasive particle 1405 having a generally triangular two-dimensional shape and a second type of shaped abrasive particle 1406 having a quadrilateral two-dimensional shape. The coated abrasive 1400 can include different amounts of the first type and second type of shaped abrasive particles 1405 and 1406. It will be appreciated that the coated abrasive may not necessarily include different types of shaped abrasive particles, and can consist essentially of a single type of shaped abrasive particle.
The abrasive particles 1407 can be diluent particles different than the first and second types of shaped abrasive particles 1405 and 1406. For example, the diluent particles can differ from the first and second types of shaped abrasive particles 1405 and 1406 in composition, two-dimensional shape, three-dimensional shape, size, and a combination thereof. For example, the abrasive particles 1407 can represent conventional, crushed abrasive grit having random shapes. The abrasive particles 1407 may have a median particle size less than the median particle size of the first and second types of shaped abrasive particles 1405 and 1406.
After sufficiently forming the make coat 1403 with the abrasive particulate materials 1405, 1406, 1407 contained therein, the size coat 1404 can be formed to overlie and bond the abrasive particulate material 1405 in place. The size coat 1404 can include an organic material, may be made essentially of a polymeric material, and notably, can use polyesters, epoxy resins, polyurethanes, polyamides, polyacrylates, polymethacrylates, poly vinyl chlorides, polyethylene, polysiloxane, silicones, cellulose acetates, nitrocellulose, natural rubber, starch, shellac, and mixtures thereof.
The abrasive particulate material 1502 of the bonded abrasive 1500 can include different types of shaped abrasive particles 1503, 1504, 1505, and 1506, which can have any of the features of different types of shaped abrasive particles as described in the embodiments herein. Notably, the different types of shaped abrasive particles 1503, 1504, 1505, and 1506 can differ from each other in composition, two-dimensional shape, three-dimensional shape, size, and a combination thereof as described in the embodiments herein.
The bonded abrasive 1500 can include a type of abrasive particulate material 1507 representing diluent abrasive particles, which can differ from the different types of shaped abrasive particles 1503, 1504, 1505, and 1506 in composition, two-dimensional shape, three-dimensional shape, size, and a combination thereof.
The porosity 1508 of the bonded abrasive 1500 can be open porosity, closed porosity, and a combination thereof. The porosity 1508 may be present in a majority amount (vol %) based on the total volume of the body of the bonded abrasive 1500. Alternatively, the porosity 1508 can be present in a minor amount (vol %) based on the total volume of the body of the bonded abrasive 1500. The bond material 1501 may be present in a majority amount (vol %) based on the total volume of the body of the bonded abrasive 1500. Alternatively, the bond material 1501 can be present in a minor amount (vol %) based on the total volume of the body of the bonded abrasive 1500. Additionally, abrasive particulate material 1502 can be present in a majority amount (vol %) based on the total volume of the body of the bonded abrasive 1500. Alternatively, the abrasive particulate material 1502 can be present in a minor amount (vol %) based on the total volume of the body of the bonded abrasive 1500.
It will be appreciated that the above characteristics can be attributed to a batch of shaped abrasive particles, which may be a group of shaped abrasive particles made through the same forming process. In another instance, a batch of shaped abrasive particles can be a group of shaped abrasive particles made by the same forming process and under substantially the same conditions using the same forming process. In yet another instance, a batch of shaped abrasive particles can be a group of shaped abrasive particles of an abrasive article, such as a fixed abrasive article, and more particularly a coated abrasive article, which may be independent of a particular forming method.
Moreover, reference herein to any dimensional characteristic (e.g., h1, h2, hi, w, Lmiddle, Lp, and the like) can be reference to a dimension of a single particle, a median value, or an average value derived from analysis of a suitable sampling of particles from a batch. Unless stated explicitly, reference herein to a dimensional characteristic can be considered reference to a median value that is based on a statistically significant value derived from a random sampling of suitable number of particles of a batch. Notably, for certain embodiments herein, the sample size can include at least 10, and more typically, at least 40 randomly selected particles from a batch of particles. A batch of particles may include, but need not necessarily be limited to, a group of particles that are collected from a single process run. In yet another instance, a batch of shaped abrasive particles can be a group of shaped abrasive particles of an abrasive article, such as a fixed abrasive article, and more particularly, a coated abrasive article, which may be independent of a particular forming method, but having one or more defining features present in a particular population of the particles. For example, a batch of particles may include an amount of shaped abrasive particles suitable for forming a commercial grade abrasive product, such as at least about 20 lbs. of particles.
In accordance with an embodiment, the body 1601 of the shaped abrasive particle can have a first corner height (hc) at a first region of the body defined by a corner 1613. Notably, the corner 1613 may be the point of greatest height on the body 1601. However, in other instances, the height at the corner 1613 does not necessarily represent the point of greatest height on the body 1601. The corner 1613 can be defined as a point or region on the body 1601 defined by the joining of the upper surface 1603 and two side surfaces 1605 and 1607. The body 1601 may further include other corners, spaced apart from each other, including for example, corner 1611 and corner 1612. As further illustrated, the body 1601 can include edges 1614, 1615, and 1616 that can separated from each other by the corners 1611, 1612, and 1613. The edge 1614 can be defined by an intersection of the upper surface 1603 with the side surface 1606. The edge 1615 can be defined by an intersection of the upper surface 1603 and side surface 1605 between corners 1611 and 1613. The edge 1616 can be defined by an intersection of the upper surface 1603 and side surface 1607 between corners 1612 and 1613.
As further illustrated, the body 1601 can include a second midpoint height (hm) at a second end of the body, which can be defined by a region at the midpoint of the edge 1614, which can be opposite the first end defined by the corner 1613. The axis 1650 can extend between the two ends of the body 1601.
In certain instances, the body of the shaped abrasive particle may have alternative features as compared to certain features described herein. For example, in one embodiment, the body can have an interior height that is less than the height of the body at the corners. In one particular embodiment, the body can have an average difference in height of at least about 5 microns, such as at least about 10 microns, or even at least about 20 microns. The average difference in height can be the absolute value of [hc-hm] between a first corner height (hc) and a second midpoint height (hm). It will be appreciated that average difference in height may be calculated as hm-hc when the height of the body 301 at a midpoint of the edge is greater than the height at an opposite corner. In other instances, the average difference in height [hc-hm], can be at least about 25 microns, at least about 60 microns, or even at least about 100 microns. In one non-limiting embodiment, the average difference in height can be not greater than about 300 microns, not greater than about 180 microns, or even not greater than about 80 microns. It will be appreciated that the average difference in height can be within a range between any of the minimum and maximum values noted above.
Moreover, the average difference in height can be based upon an average value of hc. For example, the average height of the body at the corners (Ahc) can be calculated by measuring the height of the body at all corners and averaging the values, and may be distinct from a single value of height at one corner (hc). Accordingly, the average difference in height may be calculated as the absolute value of the equation [Ahc-hi]. Furthermore, it will be appreciated that the average difference in height can be calculated using a median interior height (Mhi) calculated from a suitable sample size from a batch of shaped abrasive particles and an average height at the corners for all particles in the sample size. Accordingly, the average difference in height may be given by the absolute value of the equation [Ahc-Mhi]. The heights hc and hm of the particles can be measured using a STIL (Sciences et Techniques Industrielles de la Lumiere—France) Micro Measure 3D Surface Profilometer (white light (LED) chromatic aberration technique) and the average difference in height can be calculated based on the average values of he and hm from the sample.
In one instance, the body can have an interior height (hi), which can be the smallest dimension of height of the body as measured along a dimension between any corner and opposite midpoint edge on the body. In particular instances wherein the body is a generally triangular (or truncated triangular) two-dimensional shape, the interior height (hi) may be the smallest dimension of height (i.e., measure between the bottom surface 1604 and the upper surface 1603) of the body for three measurements taken between each of the three corners and the opposite midpoint edges. The interior height (hi) of the body of a shaped abrasive particle is illustrated in
A batch of shaped abrasive particles, can be fabricated, wherein the median interior height value (Mhi) can be controlled, which may facilitate improved performance In particular, the median internal height (hi) of a batch can be related to a median width of the shaped abrasive particles of the batch in the same manner as described above. Notably, the median interior height (Mhi) can be at least about 20%, such as at least about 22%, at least about 24%, or even at least about 26% of the median width of the shaped abrasive particles of the batch. For one non-limiting embodiment, the median interior height (Mhi) of the body can be not greater than about 80%, such as not greater than about 76%, not greater than about 70%, not greater than about 60%, not greater than about 50%, not greater than about 40%, not greater than about 38%, or even not greater than about 35% of the median width. It will be appreciated that the median interior height (Mhi) of the body can be within a range between any of the above noted minimum and maximum percentages.
Furthermore, the batch of shaped abrasive particles may exhibit improved dimensional uniformity as measured by the standard deviation of a dimensional characteristic from a suitable sample size. According to one embodiment, the shaped abrasive particles can have an interior height variation (Vhi), which can be calculated as the standard deviation of interior height (hi) for a suitable sample size of particles from a batch. The interior height variation can be not greater than about 60 microns, such as not greater than about 58 microns, not greater than about 56 microns, or even not greater than about 54 microns. In one non-limiting embodiment, the interior height variation (Vhi) can be at least about 2 microns. It will be appreciated that the interior height variation of the body can be within a range between any of the above noted minimum and maximum values.
For another embodiment, the body of the shaped abrasive particle can have an interior height (hi) of at least about 100 microns, such as at least about 200 microns. More particularly, the height may be at least about 250 microns, such as at least about 300 microns, or even at least about 400 microns. In still one non-limiting embodiment, the height of the body can be not greater than about 8 mm, such as not greater than about 5 mm, not greater than about 4 mm, not greater than about 3 mm, such as not greater than about 2 mm, not greater than about 1.5 mm, not greater than about 1 mm, not greater than about 800 microns, not greater than about 600 microns, or even not greater than about 400 microns. It will be appreciated that the height of the body can be within a range between any of the above noted minimum and maximum values. Moreover, it will be appreciated that the above range of values can be representative of a median interior height (Mhi) value for a batch of shaped abrasive particles.
For certain embodiments herein, the body of the shaped abrasive particle can have particular dimensions, including for example, a width≧length, a length≧height, and a width≧height, and even more particularly, a width>length, a length>height, and a width>height. The body of the shaped abrasive particle can have a width (w) of at least about 600 microns, such as at least about 700 microns, at least about 800 microns, or even at least about 900 microns. In one non-limiting instance, the body can have a width of not greater than about 4 mm, such as not greater than about 3 mm, not greater than about 2.5 mm, or even not greater than about 2 mm. It will be appreciated that the width of the body can be within a range between any of the above noted minimum and maximum values. Moreover, it will be appreciated that the above range of values can be representative of a median width (Mw) for a batch of shaped abrasive particles.
The body of the shaped abrasive particle can have particular dimensions, including for example, a length (L middle or Lp) of at least about 0.4 mm, such as at least about 0.6 mm, at least about 0.8 mm, or even at least about 0.9 mm. Still, for at least one non-limiting embodiment, the body can have a length of not greater than about 4 mm, such as not greater than about 3 mm, not greater than about 2.5 mm, or even not greater than about 2 mm. It will be appreciated that the length of the body can be within a range between any of the above noted minimum and maximum values. Moreover, it will be appreciated that the above range of values can be representative of a median length (Ml), which may be more particularly, a median middle length (MLmiddle) or median profile length (MLp) for a batch of shaped abrasive particles.
The shaped abrasive particle can have a body having a particular amount of dishing, wherein the dishing value (d) can be defined as a ratio between an average height of the body at the corners (Ahc) as compared to smallest dimension of height of the body at the interior (hi). The average height of the body at the corners (Ahc) can be calculated by measuring the height of the body at all corners and averaging the values, and may be distinct from a single value of height at one corner (hc). The average height of the body at the corners or at the interior can be measured using a STIL (Sciences et Techniques Industrielles de la Lumiere—France) Micro Measure 3D Surface Profilometer (white light (LED) chromatic aberration technique). Alternatively, the dishing may be based upon a median height of the particles at the corner (Mhc) calculated from a suitable sampling of particles from a batch. Likewise, the interior height (hi) can be a median interior height (Mhi) derived from a suitable sampling of shaped abrasive particles from a batch. According to one embodiment, the dishing value (d) can be not greater than about 2, such as not greater than about 1.9, not greater than about 1.8, not greater than about 1.7, not greater than about 1.6, not greater than about 1.5, not greater than about 1.3, not greater than about 1.2, not greater than about 1.14, or even not greater than about 1.10. Still, in at least one non-limiting embodiment, the dishing value (d) can be at least about 0.9, such as at least about 1.0, or even at least about 1.01. It will be appreciated that the dishing ratio can be within a range between any of the minimum and maximum values noted above. Moreover, it will be appreciated that the above dishing values can be representative of a median dishing value (Md) for a batch of shaped abrasive particles.
The shaped abrasive particles of the embodiments herein, including for example, the body 1601 of the particle of
The shaped abrasive particles of the embodiments herein can have a percent flashing that may facilitate improved performance. Notably, the flashing can define an area of the particle as viewed along one side, such as illustrated in
The percent flashing can be measured by mounting the shaped abrasive particle on its side and viewing the body at the side to generate a black and white image, such as illustrated in
A batch of shaped abrasive particles according to embodiments herein may exhibit improved dimensional uniformity as measured by the standard deviation of a dimensional characteristic from a suitable sample size. According to one embodiment, the shaped abrasive particles can have a flashing variation (Vf), which can be calculated as the standard deviation of flashing percentage (f) for a suitable sample size of particles from a batch. According to one embodiment, the flashing variation can be not greater than about 5.5%, such as not greater than about 5.3%, not greater than about 5%, or not greater than about 4.8%, not greater than about 4.6%, or even not greater than about 4.4%. In one non-limiting embodiment, the flashing variation (Vf) can be at least about 0.1%. It will be appreciated that the flashing variation can be within a range between any of the minimum and maximum percentages noted above.
The shaped abrasive particles of the embodiments herein can have a height (hi) and flashing multiplier value (hiF) of at least 4000, wherein hiF=(hi)(f), an “hi” represents a minimum interior height of the body as described above and “f” represents the percent flashing. In one particular instance, the height and flashing multiplier value (hiF) of the body can be greater, such as at least about 2000 micron %, at least about 2500 micron %, at least about 2800 micron %, at least about 3000 Micron %, or even at least about 3200 micron %. Still, in one non-limiting embodiment, the height and flashing multiplier value can be not greater than about 45000 micron %, such as not greater than about 20000 micron %, not greater than about 10000 micron %, not greater than about 8000 micron %, or even not greater than about 5000 micron %. It will be appreciated that the height and flashing multiplier value of the body can be within a range between any of the above minimum and maximum values. Moreover, it will be appreciated that the above multiplier value can be representative of a median multiplier value (MhiF) for a batch of shaped abrasive particles.
The shaped abrasive particles of the embodiments herein can have a dishing (d) and flashing (F) multiplier value (dF) as calculated by the equation dF=(d)(F), wherein dF is not greater than about 90%, wherein “d” represents the dishing value, and “f” represents the percentage flashing of the body. In one particular instance, the dishing (d) and flashing (F) multiplier value (dF) of the body can be not greater than about 70%, such as not greater than about 60%, not greater than about 50%, not greater than about 30%, not greater than about 20%, or even not greater than about 10%. Still, in one non-limiting embodiment, the dishing (d) and flashing (F) multiplier value (dF) can be at least about 4.5%, such as at least about 6%, at least about 7%, at least about 7.5%, or even at least about 8%. It will be appreciated that the dishing (d) and flashing (F) multiplier value (dF) of the body can be within a range between any of the above minimum and maximum values. Moreover, it will be appreciated that the above multiplier value can be representative of a median multiplier value (MdF) for a batch of shaped abrasive particles.
The shaped abrasive particles of the embodiments herein can have a height and dishing ratio (hi/d) as calculated by the equation hi/d=(hi)/(d), wherein hi/d is not greater than about 1000, and “hi” represents a minimum interior height as described above, and “d” represents the dishing of the body. In one particular instance, the ratio (hi/d) of the body can be not greater than about 900 microns, not greater than about 800 microns, not greater than about 700 microns, or even not greater than about 650 microns. Still, in one non-limiting embodiment, the ratio (hi/d), can be at least about 10 microns, such as at least about 100 microns, at least about 200 microns, at least about 250 microns, at least about 300 microns, at least about 350 microns, or even at least about 375 microns. It will be appreciated that the ratio (hi/d) of the body can be within a range between any of the above minimum and maximum values. Moreover, it will be appreciated that the above height and dishing ratio can be representative of a median height and dishing ratio (Mhi/d)for a batch of shaped abrasive particles.
The shaped abrasive particles of the embodiments herein can have a side ratio, which can be defined by [(w−l)/hi], wherein “w” is the width or greatest dimension of the side of the particle as viewed from the side, “l” represents the length of the particle along an opposite major surface of the particle from the width as viewed from the side, and “hi” represents the interior height as described herein. In particular instances, “l” may be the profile length. According to one embodiment, the side ratio can be at least about 0.45, such as at least about 0.5, at least about 0.55, or even at least about 0.6. Still, in one non-limiting embodiment, the side ratio can be not greater than about 0.99, such as not greater than about 0.95, not greater than about 0.9, or even not greater than about 0.88. It will be appreciated that the side ratio of the body can be within a range between any of the above minimum and maximum values. Moreover, it will be appreciated that the above side ratio can be a median value, derived from median dimension values of width, length, and interior height for a batch of shaped abrasive particles.
According to another embodiment, the body can have a particular rake angle, which may be defined as an angle between the bottom surface 304 and a side surface 305, 306 or 307 of the body. For example, the rake angle may be within a range between about 1° and about 100°. For other particles herein, the rake angle can be within a range between about 5° and 100°, such as between about 10° and about 100°, between about 15° and 100°, or even between about 20° and 93°. Formation of an abrasive particle having such a rake angle can improve the abrading capabilities of the abrasive particle. Notably, the rake angle can be within a range between any two rake angles noted above.
The shaped abrasive particle can be formed such that the body includes a crystalline material, and more particularly, a polycrystalline material. Notably, the polycrystalline material can include abrasive grains. In one embodiment, the body can be essentially free of an organic material, including for example, a binder. More particularly, the body can consist essentially of a polycrystalline material.
In one aspect, the body of the shaped abrasive particle can be an agglomerate including a plurality of abrasive particles, grit, and/or grains bonded to each other to form the body of the abrasive particle. Suitable abrasive grains can include nitrides, oxides, carbides, borides, oxynitrides, oxyborides, diamond, and a combination thereof. In particular instances, the abrasive grains can include an oxide compound or complex, such as aluminum oxide, zirconium oxide, titanium oxide, yttrium oxide, chromium oxide, strontium oxide, silicon oxide, and a combination thereof. In one particular instance, the abrasive particle is formed such that the abrasive grains forming the body 101 include alumina, and more particularly, may consist essentially of alumina.
The abrasive grains (i.e., crystallites) contained within the body may have an average grain size that is generally not greater than about 100 microns. In other embodiments, the average grain size can be less, such as not greater than about 80 microns, not greater than about 50 microns, not greater than about 30 microns, not greater than about 20 microns, not greater than about 10 microns, or even not greater than about 1 micron. Still, the average grain size of the abrasive grains contained within the body can be at least about 0.01 microns, such as at least about 0.05 microns, such as at least about 0.08 microns, at least about 0.1 microns, or even at least about 1 micron. It will be appreciated that the abrasive grains can have an average grain size within a range between any of the minimum and maximum values noted above.
In accordance with certain embodiments, the abrasive particle can be a composite article including at least two different types of abrasive grains within the body. It will be appreciated that different types of abrasive grains are abrasive grains having different compositions with regard to each other. For example, the body can be formed such that is includes at least two different types of abrasive grains, wherein the two different types of abrasive grains can be nitrides, oxides, carbides, borides, oxynitrides, oxyborides, diamond, and a combination thereof.
In accordance with an embodiment, the abrasive particle can have an average particle size, as measured by the largest dimension measurable on the body, of at least about 100 microns. In fact, the abrasive particle can have an average particle size of at least about 150 microns, such as at least about 200 microns, at least about 300 microns, at least about 400 microns, at least about 500 microns, at least about 600 microns, at least about 700 microns, at least about 800 microns, or even at least about 900 microns. Still, the abrasive particle can have an average particle size that is not greater than about 5 mm, such as not greater than about 3 mm, not greater than about 2 mm, or even not greater than about 1.5 mm. It will be appreciated that the abrasive particle can have an average particle size within a range between any of the minimum and maximum values noted above.
As further shown in
The upper portion 1772 can include a substantially flat surface extending between the side surfaces 1706 and 1705. The upper portion can be abutting the upper surface 1702, and more particularly, intersecting an edge defining a perimeter of the upper surface 1702. The upper portion 1772 can have a height extending vertically in the direction of the height of the particle for a fraction of the total height of the particle. The upper portion 1772 can extend downward from the upper surface 1702 toward the bottom surface 1703 of the body and abutting the bottom portion 1771 at a point along the corner 1709 between the upper surface 1702 and bottom surface 1703.
The corner 1708 of the body can include a completely truncated corner, wherein the entire corner 1708 is defined by a single, substantially flat surface extending between the upper surface 1702 and the bottom surface 1703 of the body.
As further shown in
The fractured region 1775 can extend along the side surface 1705. The fractured region 1775 can define a serrated edge comprising protrusions and grooves. In particular locations, the fractured region 1775 can define irregularly shaped protrusions and irregular shaped grooves extending from the bottom surface 1703. In certain instances, the serrated edge can have the appearance of a saw blade edge. Moreover, the fractured region 1775 can have a height extending for a fraction of the height of the side surface 1705.
In certain instances, at least a portion of the fractured surface 1775 can define irregular scalloped edge. The irregular scalloped edge can have substantially arcuate-shaped grooves separated by ridges. Moreover, the irregular scalloped edge can flow downward from the upper surface 1703 along the side surface 1705 and extend outward from the side surface 1705 away from the body 1701.
The shaped abrasive particle 1700 can have a ripple feature 1710 extending along at least a portion of the side surface of the body 1701. The ripple feature 1710 may be a result of one or more aspects of the forming process. As shown in
According to a particular embodiment, at least one ridge can extend along the side surface of the body 1701 in a direction defined by a longitudinal axis that defines an angle within a range between about 10 degrees and about 170 degrees relative to the first major surface 1702. Referring to
According to embodiments herein, the ripple feature 1701 can extend along a majority of a width of the body 1701 on the side surface. For example, the ripple feature 1701 can extend for at least about 70%, such as at least about 80%, or even at least about 90% of the width of the body of a side surface. In still another, non-limiting embodiment, the ripple feature 1710 can extend for essentially the entire width of the body 1701 along at least one side surface.
Moreover, the ripple feature 1710 may be present on more than one side surface of the body 1701. For example, the ripple feature 1710 can extend along a majority of the external surface area the side surfaces of the body 1701. More particularly, the ripple feature 1710 can extend along substantially all side surfaces of the body 1701.
The ripple feature may have a particular height relative to the height of the body 1701. For example, the ripple feature 1701 may have a height, as defined by the longest dimension or the ripple feature in a direction parallel to the greatest height dimension (e.g., hc) of the body 1701, which can be at least a portion (e.g., a minority) of the height of the body 1701 on at least one side surface. According to one embodiment, the ripple feature can extend for at least about 10%, such as at least about 20%, at least about 30%, or even at least about 40% of the height of the body 1701. In more particular instances, the ripple feature 1710 can extend for a majority of a height of the body 1701 on at least one side surface, including for example, at least about 50%, such as at least about 60%, at least about 70%, at least about 80%, or even at least about 90% of the height of the body. In certain instances, the ripple feature 1710 can extend for essentially the entire height of at least one side surface of the body 1701.
According to another aspect, the ripple feature 1710 can extend for at least a portion of a height of the body on a majority of side surfaces of the body 1701. In certain embodiments, the ripple feature 1710 can extend for at least a portion of a height of the body 1701 on each of the side surfaces of the body 1701.
The side surface comprising the ripple feature can have a surface roughness greater than a surface roughness of the first major surface 1702 or second major surface 1703 of the body 1701. In particular, as illustrated in views of
In certain instances, the ripple feature 1710 can intersect an edge defining a first major surface 1702 of the body 1701. More particularly, a majority of the ripple feature 1710 along the side surface of the body 1701 can intersect an upper surface 1702 of the body 1701. Still, more particularly, essentially the entire ripple feature 1710 can intersects an edge defining an upper surface 1702 of the body 1701. Moreover, at least a portion of the ripple feature 1710 can be spaced apart from a non-intersecting a bottom surface 1703 of the body 1701.
The fractured region 1755 can have a surface roughness that is greater than a surface roughness of the first major surface 1702 or second major surface 1703 of the body 1701. In particular instances, the fractured region 1755 can define a region having a surface roughness greater than a surface roughness of an upper surface 1702 of the body 1701 or bottom surface 1703 of the body 1701. Moreover, the fractured region 1755 can define a region having a surface roughness greater than a surface roughness of a side surface spaced apart from the fracture region, and more particularly, a surface roughness greater than a surface roughness of the side surface including a ripple feature 1710.
As further illustrated, for shaped abrasive particles having a ripple feature 1754 and a fractured region 1755 on the same side surface 1757, the ripple feature 1754 and fractured region 1755 can be separated by a boundary 1756, which may be a region characterized by a substantially smooth surface. Moreover, in such particles, the fractured region 1755 can be abutting the edge of the body 1751 defining the bottom surface 1753 while the ripple feature 1754 can be abutting an edge of the body 1751 defining the upper surface 1752.
According to one embodiment, for certain shaped abrasive particles, the fractured region 1755 may extend for a minority of a width of the body on the side surface. In still other embodiments, the fractured region 1755 can extend along a majority of a width of the body on the side surface. Even more particularly, for certain shaped abrasive particles, the fractured region 1755 can extend for at least about 70%, such as at least about 80%, or even at least about 90% of the width of the body on a side surface. In certain instances, the fractured region can extend for essentially the entire width of the body along the entire side surface.
For certain shaped abrasive particles, the fractured region can extend along a minority of the external surface area of all side surfaces of the body. Still, for another aspect, the fractured region may extend along a majority of all side surfaces of the body. And in yet other instances, the fractured region can extend along essentially all of the side surfaces of the body.
Moreover, the fractured region 1755 can have a height (hfr) that is at least a portion of the greatest height (e.g., hc) of the body on at least one side surface. The height of the fracture region (hfr) can be the greatest dimension in the direction parallel to the height of the body 1751. According to one embodiment, the fractured region 1755 can have a height (hfr) extending for a minority of a height of the body 1751 on at least one side surface 1757. In other instances, the fractured region can have a height (hfr) extending for a majority of a height of the body 1751 on at least one side surface 1757. It will be appreciated that such features may exist for any side surfaces of shaped abrasive particles according to embodiments herein. Moreover, such features may exist for one, a minority fraction, or even a majority of shaped abrasive particles of a batch according to embodiments herein.
Embodiments herein also include a batch of particulate material, which can include one or more shaped abrasive particles of the embodiments herein. Moreover, the batch of particulate material can include shaped abrasive particles having one or more features described herein. One or more features of the shaped abrasive particles described herein can be evident in the shaped abrasive particles of a batch. Moreover, the batch may be characterized by the existence and variance of the one or more features.
According to one aspect, a batch of particulate material can include a first portion including a first type of shaped abrasive particle and a second portion including a second type of shaped abrasive particle. The content of the first portion and second portion within the batch may be controlled at least in part based upon certain processing parameters. The first portion may include a plurality of shaped abrasive particles, wherein each of the particles of the first portion can have substantially the same two-dimensional shape.
The batch may include various contents of the first portion. For example, the first portion may be present in a minority amount or majority amount. In particular instances, the first portion may be present in an amount of at least about 1%, such as at least about 5%, at least about 10%, at least about 20%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, or even at least about 90% for the total content of portions within the batch. Still, in another embodiment, the batch may include not greater than about 99%, such as not greater than about 90%, not greater than about 80%, not greater than about 70%, not greater than about 60%, not greater than about 50%, not greater than about 40%, not greater than about 30%, not greater than about 20%, not greater than about 10%, not greater than about 8%, not greater than about 6%, or even not greater than about 4% of the total portions within the batch. The batch can include a content of the first portion within a range between any of the minimum and maximum percentages noted above.
The second portion can include a plurality of shaped abrasive particles, wherein each of the shaped abrasive particles of the second portion can have substantially the same type of two-dimensional shape, but a distinct type of shape compared to the plurality of shaped abrasive particles of the first portion.
In certain instances, the batch may include a lesser content of the second portion relative to the first portion, and more particularly, may include a minority content of the second portion relative to the total content of particles in the batch. For example, the batch may contain a particular content of the second portion, including for example, not greater than about 40%, such as not greater than about 30%, not greater than about 20%, not greater than about 10%, not greater than about 8%, not greater than about 6%, or even not greater than about 4%. Still, in at least on non-limiting embodiment, the batch may contain at least about 0.5%, such as at least about 1%, at least about 2%, at least about 3%, at least about 4%, at least about 10%, at least about 15%, or even at least about 20% of the second portion for the total content of portions within the batch. It will be appreciated that the batch can contain a content of the second portion within a range between any of the minimum and maximum percentages noted above.
Still, in an alternative embodiment, the batch may include a greater content of the second portion relative to the first portion, and more particularly, can include a majority content of the second portion for the total content of particles in the batch. For example, in at least one embodiment, the batch may contain at least about 55%, such as at least about 60% of the second portion for the total portions of the batch.
In certain instances, the first type of shaped abrasive particle of the first portion can have a two-dimensional shape as viewed in a plane defined by a length (l) and a width (w) selected from the group of polygons, ellipsoids, numerals, Greek alphabet letters, Latin alphabet letters, Russian alphabet characters, complex shapes including a combination of polygonal shapes, and a combination thereof. For at least one particular embodiment, the first type of shaped abrasive particle of the first portion can be a triangular two-dimensional shape. The first portion may be, but need not be, essentially free of corner-truncated shapes.
The second portion can include a corner-truncated shape, including for example, a corner-truncated polygonal shape. In one particular embodiment, the second portion can include corner-truncated triangular shapes, and may consist essentially of corner-truncated triangular shapes. It will be appreciated that the batch can include other portions, including for example a third portion, comprising a plurality of shaped abrasive particles having a third type of two-dimensional shape that is different than the two-dimensional shape of the first type and second type of shaped abrasive particles. For example, in one particular embodiment, the batch can include a first portion comprising a plurality of shaped abrasive particles having a triangular two-dimensional shape, a second portion including a plurality of shaped abrasive particles having a single corner-truncated polygonal shape (e.g., a single corner-truncated triangular shape), and a third portion comprising a multiple (i.e., more than one) corner-truncated polygonal shape (e.g., corner-truncated triangular shapes having two or three corners truncated). Still, the second portion may include single corner-truncated shapes and multiple (i.e., more than one) corner-truncated shapes. For example, at least 10% of the second portion can include multiple corner-truncated triangle shapes having more than one truncated corner.
The batch may include various contents of the third portion relative to the second portion and first portion. The third portion may be present in a minority amount or majority amount. In particular instances, the third portion may be present in an amount of not greater than about 40%, such as not greater than about 30%, not greater than about 20%, not greater than about 10%, not greater than about 8%, not greater than about 6%, or even not greater than about 4% of the total portions within the batch. Still, in other embodiments the batch may include a minimum content of the third portion, such as at least about 1%, such as at least about 5%, at least about 10%, at least about 20%, at least about 30%, at least about 40%, or even at least about 50%. The batch can include a content of the third portion within a range between any of the minimum and maximum percentages noted above. Moreover, the batch may include a content of diluent, randomly shaped abrasive particles.
The batch may further include other features. For example, one or more shaped abrasive particles of the portions of the batch can have features of embodiments herein. In one instance, at least one shaped abrasive particle of the first portion can have a ripple feature on at least a portion of a side surface of the body of the particle. In other instances, a majority of shaped abrasive particles of the first portion can have a ripple feature on at least one side surface. In yet another aspect, essentially all of the shaped abrasive particles of the first portion can have a ripple feature on at least one side surface.
Moreover, at least one shaped abrasive particle of the second portion can include a ripple feature on at least a portion of a side surface. In yet another embodiment, a majority of shaped abrasive particles of the second portion can have a ripple feature on at least one side surface of each body. In still yet another aspect, essentially all of the shaped abrasive particles of the second portion may have a ripple feature on at least one side surface of each body.
Another aspect of the batch can be that at least one shaped abrasive particle of the first portion may have a fractured region on at least a portion of a side surface. For other embodiments, a majority of shaped abrasive particles of the first portion, including for example, essentially all of the shaped abrasive particles of the first portion, may have a fractured region on at least one side surface. Additionally or alternatively, at least one shaped abrasive particle of the second portion can include a fractured region on at least a portion of a side surface. More particularly, a majority of shaped abrasive particles of the second portion, and even essentially all of the shaped abrasive particles of the second portion, can include a fractured region on at least one side surface of each body.
At least one shaped abrasive particle of the first portion can have a side surface having a surface roughness greater than a surface roughness of a first major surface of the corresponding body. In still other instances, a majority of the shaped abrasive particles of the first portion, including essentially all of the shaped abrasive particles of the first portion, can have at least one side surface having a surface roughness greater than a surface roughness of the first major surface (e.g., an upper surface) for each of the corresponding bodies.
Likewise, at least one shaped abrasive particle of the second portion can have a side surface having a surface roughness greater than a surface roughness of a first major surface of the corresponding body. In one particular embodiment, a majority of the shaped abrasive particles of the second portion, including essentially all of the shaped abrasive particles of the second portion, can have at least one side surface having a surface roughness greater than a surface roughness of the first major surface for each of the corresponding bodies.
As will be appreciated, the batch can be part of a fixed abrasive article, including exemplary abrasive articles described herein. Moreover, according to certain embodiments, batch of particulate material may be incorporated into the fixed abrasive article in a predetermined orientation, wherein each of the shaped abrasive particles can have a predetermined orientation relative to each other and relative to a portion of the abrasive article (e.g., the backing of a coated abrasive).
A mixture in the form of a gel is obtained having approximately 52% solids loading of boehmite commercially available as Catapal B from Sasol Corp. combined with 48 wt % water containing a minority content of nitric acid and organic additives. The gel has a viscosity of approximately 8×104 Pa s and a storage modulus of 5×105 Pa, wherein viscosity is calculated by dividing the storage modulus value by 6.28 s−1.
The gel is extruded from a die at approximately 80 psi (552 kPa) onto a translating belt having a film of polyester. The gel travels under a knife edge of the die to form a sheet having a height of approximately 1 mm. Within 10 minutes of extruding, the sheet is sectioned using a blade at ambient atmospheric conditions, in air, and at a temperature of approximately 72° F. to form precursor shaped abrasive particles. The openings are maintained using an air knife directing air at the openings formed by the blade. The precursor shaped abrasive particles are dried for approximately 1-4 hours and fired at a temperature of approximately 1200° C.-1400° C. for 15 minute to 1 hour in air.
The shaped abrasive particles of Example 1 were formed and analyzed.
The present application represents a departure from the state of the art. While the industry has recognized that shaped abrasive particles may be formed through processes such as molding and screen printing, the processes of the embodiments herein are distinct from such processes. Notably, the embodiments herein utilize a combination of process features that facilitate the formation of shaped abrasive particles having one or a combination of unique features. Such features can include, but are not limited to, aspect ratio, composition, additives, two-dimensional shape, three-dimensional shape, difference in height, difference in height profile, flashing percentage, interior height, dishing, side ratio, fractured regions, ripple feature, and other aspects of the embodiments herein. Moreover, the processes of the embodiments herein facilitate the formation of a shaped abrasive particle or a batch of shaped abrasive particles, having one or more characteristics, including one or more combination of the features of the shaped abrasive particles. Certain shaped abrasive particles and batches containing shaped abrasive particles of the embodiments herein may have features that enable enhanced performance in the context of fixed abrasive articles. And in fact, and quite unexpectedly, such compositions may facilitate improved grinding performance in the context of fixed abrasives, such as bonded abrasives or coated abrasives.
The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.
The Abstract of the Disclosure is provided to comply with Patent Law and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, various features may be grouped together or described in a single embodiment for the purpose of streamlining the disclosure. This disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter may be directed to less than all features of any of the disclosed embodiments. Thus, the following claims are incorporated into the Detailed Description, with each claim standing on its own as defining separately claimed subject matter.
The present application claims priority from U.S. Provisional Patent Application No. 61/581,800, filed Dec. 30, 2011, entitled “SHAPED ABRASIVE PARTICLE AND METHOD OF FORMING SAME,” naming inventor Paul Braun et al., which application is incorporated by reference herein in its entirety.
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| 20130199105 A1 | Aug 2013 | US |
| Number | Date | Country | |
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| 61581800 | Dec 2011 | US |
