Patent Application
20250235926
The invention relates to the technical field of metal composite coatings and composite bulk materials, in particular to an amorphous alloy reinforced Cu-based composite coating and composite bulk material and a preparation method thereof.
Cold spray technology involves the generation of supersonic gas flows through heating and pressurizing with low-temperature gas, which accelerates the spray powder to supersonic speeds in the solid state, thereby causing the metal particles to strike the substrate, undergoing intense plastic deformation, and subsequently depositing on the substrate surface to form a coating. The two commonly used cold spray technologies are low-pressure cold spraying and high-pressure cold spraying. However, low-pressure cold spraying, due to its lower spraying pressure, is only suitable for depositing coatings with high plasticity, such as Cu, Al, and Zn. Currently, cold spray technology is widely applied in fields such as additive manufacturing, wear-resistant coatings, and coating corrosion protection.
In prior art, in the fields of coatings and additive manufacturing, people have used cold spraying to prepare pure metal elemental coatings and additively manufactured materials. Among these, pure Cu coatings and additively manufactured materials are widely used, but the resulting materials have drawbacks, such as poor wear resistance; additionally, during the spraying process, there are often gaps or voids between the sprayed particles, which not only affect the performance of the coatings and additively manufactured materials, but also significantly reduce their service life.
After conducting a search, it was found that a Chinese patent discloses a Cu-based composite powder for selective laser melting and forming of Fe-based amorphous reinforced Cu-based alloy (Publication Number: CN112643022A); this invention uses Cu-based composite powder with a particle size of 40 μm to 50 μm as the forming material, and employing the selective laser melting method to prepare the Fe-based amorphous reinforced Cu-based alloy; the Cu-based composite powder mainly consists of Fe-based amorphous powder and Cu alloy powder in a mass ratio of 1:9 to 1:7. The advantages of this invention are as follows: during the selective laser melting process, the Cu-based composite powder undergoes liquid-phase separation and self-assembles to form spherical amorphous Fe particles, which are dispersed within a Cu-rich matrix; the Fe-based amorphous reinforced Cu-based alloy exhibits excellent comprehensive properties such as high strength, high corrosion resistance, high wear resistance, and high thermal conductivity. However, it also has the following defects:
After conducting a search, it was found that a Chinese patent discloses an in-situ amorphous particle-reinforced Cu alloy material (Publication No: CN113061778A); this invention belongs to the technical field of the design and preparation technology of Cu alloys and their composite materials, in particular to an in-situ amorphous particle-reinforced Cu alloy material; the material comprises alloy elements Cu and Ni (or Fe, Co), as well as added alloy elements Nb, Ta, Sn, and B (or Si, B, C, Cr, Mo, Co, Ni, and also Nb, Ta, B, Si, C, Nb, Fe, and Mo) that promote the separation of Cu and Ni (or Fe, Co); during rapid cooling of the alloy melt, liquid-phase decomposition occurs first, forming two liquid phases: Cu alloy and Ni alloy (or Fe alloy, Co alloy); the matrix liquid-phase Cu alloy and the second liquid-phase Ni alloy (or Fe alloy, Co alloy) undergo crystalline solidification and amorphous transformation respectively, resulting in the in-situ formation of amorphous particle-reinforced Cu alloy material. In the in-situ amorphous particle-reinforced Cu alloy material of this invention, the reinforcing phase has good interfacial bonding with the metal matrix, the material has high density, and no brittle phases are produced at the interface. However, it also has the following deficiencies:
The object of the invention is to provide an amorphous alloy reinforced Cu-based composite coating and composite bulk material and a preparation method thereof, which addresses the shortcomings of the prior art in the background technology, particularly in the area of coatings and additive manufacturing, pure metal elemental coatings and additively manufactured materials are prepared through cold spraying, with pure Cu coatings and additively manufactured materials being widely used. However, the materials produced still have drawbacks such as poor wear resistance, and during the spraying process, there are often gaps or voids between the sprayed particles, which not only affect the performance of the coatings and additively manufactured materials, but also significantly reduce their service life. The invention offers the advantages of a simple method, short production cycle, low cost, mild reaction conditions, strong operability, and improved wear resistance of the composite coating and composite bulk material, enhanced tensile strength of the composite bulk material while maintaining the high electrical conductivity of Cu.
In order to solve the above technical problems, the invention provides the following technical scheme:
Preferably, a proportion of the Cu powder included in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material is 55% to 95%.
Preferably, a proportion of the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder content in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material is 5% to 45%.
Preferably, the particle sizes of both the Cu powder and the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder included in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material range from 20 μm to 50 μm.
A preparation method of the amorphous alloy reinforced Cu-based composite coating and composite bulk material, comprising the following steps:
Preferably, in S3, the powder mixer used is a V-type powder mixer, and the powder mixer used can also be a three-dimensional powder mixer or a two-dimensional powder mixer, and the mixing speed of the powder mixer is 150 r/min to 300 r/min, and the mixing time of the powder mixer is 30 min to 90 min.
Preferably, in S4, the drying time for the mixed Cu powder and the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder is 2 h to 6 h, and drying temperature is preferably 40° C. to 80° C.
Preferably, in S4, the Cu powder and the amorphous alloy powder are treated to obtain the mixed powder, and the mixed powder is fed into a powder feeding system of a cold spray system for spraying.
Preferably, the powder feed system comprises at least a receiving device, the receiving device is made of Al alloy substrate, the spraying distance for the spraying process is preferably 20 mm to 40 mm;
Preferably, the receiving device needs to be pretreated before use, the pretreatment at least includes sandblasting, ultrasonic cleaning, and drying treatments;
Compared with the prior art, the invention has the following advantageous effects:
The technical schemes in the embodiments of the invention will be clearly and completely described in combination with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only some of the embodiments of the invention, but not all of the embodiments. Based on the embodiments in this invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this invention.
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A proportion of the Cu powder included in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material is 55% to 95%.
A proportion of the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder content in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material is 5% to 45%.
The particle sizes of both the Cu powder and the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder included in the amorphous alloy reinforced Cu-based composite coating and the amorphous alloy reinforced Cu-based composite bulk material range from 20 μm to 50 μm, preferably 25 μm to 45 μm, and more preferably 30 μm to 40 μm.
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In S3, the powder mixer used is a V-type powder mixer, and the powder mixer used can also be a three-dimensional powder mixer or a two-dimensional powder mixer, and the mixing speed of the powder mixer is preferably 150 r/min to 300 r/min, more preferably 180 r/min to 270 r/min, and even more preferably 200 r/min to 250 r/min; and the mixing time of the powder mixer is preferably 30 min to 90 min, more preferably 40 min to 80 min, and even more preferably 50 min to 70 min.
In S4, the drying time for the mixed Cu powder and the amorphous alloy (Fe54.61Mo16.8Cr25.8C2.44Si0.35) powder is preferably 2 h to 6 h, more 3 h to 5 h, and even more preferably 3.5 h to 4.5 h; and drying temperature is preferably 40° C. to 80° C., more preferably 50° C. to 70° C., and even more preferably 55° C. to 65° C.
In step S4, the Cu powder and the amorphous alloy powder are treated to obtain the mixed powder, and the mixed powder is fed into a powder feed system of a cold spray system for spraying; the travel speed of the spraying is preferably 20 mm/s to 80 mm/s, more preferably 30 mm/s to 70 mm/s, and even more preferably 40 mm/s to 60 mm/s, the thickness of the sprayed composite coating is preferably 300 μm to 2000 μm, and the thickness of the composite bulk material is preferably 0.8 cm to 1.2 cm.
The powder feed system comprises at least a receiving device, the receiving device is made of Al alloy substrate, the spraying distance for the spraying process is preferably 20 mm to 40 mm, more preferably 20 mm to 30 mm, and even more preferably 20 mm to 25 mm;
The receiving device needs to be pretreated before use, the pretreatment at least includes sandblasting, ultrasonic cleaning, and drying treatments;
After the spraying process is completed, the composite coating and composite bulk material can be used directly or after undergoing annealing, the annealing temperature is preferably 435° C. to 600° C., more preferably 450° C. to 550° C., and even more preferably 480° C. to 500° C.; the selection of annealing time is based on the principle that the amorphous alloy does not undergo crystallization at a specific annealing temperature, preferably 5 min to 30 min, more preferably 10 min to 25 min, and even more preferably 15 min to 20 min.
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In step 7, the obtained composite bulk material was annealed at 500° C. for 15 min, and the performance of the composite bulk material was tested. The results are shown in Table 6.
Although the embodiments of the invention have been shown and described above, it should be understood that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202410093977.6 | Jan 2024 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2024/103288 | 7/3/2024 | WO |
