Metal powder composed of spherical particles

Information

  • Patent Grant
  • 10350680
  • Patent Number
    10,350,680
  • Date Filed
    Thursday, March 24, 2016
    8 years ago
  • Date Issued
    Tuesday, July 16, 2019
    4 years ago
Abstract
A problem to be solved is to provide a metal powder having a variety of excellent performances, and, in order to solve such a problem, the present invention provides a metal powder that is composed of many spherical particles; that includes at least one of Ni, Fe, and Co, in which the total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more; that has a cumulative 10 vol % particle size D10 of 1.0 μm or more; and in which a value Y is 7.5 to 24.0 as calculated by the following mathematical equation: Y=D50×ρ×S, where D50 represents a cumulative 50 vol % particle size of the powder, ρ represents a true density of the powder, and S represents a specific surface area of the powder.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the United States national phase of International Application No. PCT/JP2016/059444 filed Mar. 24, 2016, and claims priority to Japanese Patent Application Nos. 2015-071902 and 2016-019607, filed Mar. 31, 2015 and Feb. 4, 2016, respectively, the disclosures of which are hereby incorporated in their entirety by reference.


BACKGROUND OF THE INVENTION
Field of the Invention

The present invention relates to a metal powder used for three-dimensional additive manufacturing processes, thermal spraying processes, laser coating processes, padding processes, and the like. More specifically, the present invention relates to a metal powder including many spherical particles.


Background Art

Three-D printers are used for the fabrication of shaped objects composed of metal. Such 3D printers involve a three-dimensional additive manufacturing process to fabricate shaped objects. In additive manufacturing processes, spread metal powder is irradiated with a laser beam or an electron beam. The irradiation melts the metal. Then, the metal solidifies. The melting and the solidifying allow the spherical particles in the powder to be bound together. The irradiation is conducted selectively against parts of the metal powder. The parts of the powder that are not irradiated are not melted. Only the parts that have been irradiated form a bound layer. A bound layer may also be obtained by the beam irradiation of metal powder that is spouted from a nozzle and is traveling.


A further metal powder is spread over the bound layer. This metal powder is irradiated with a laser beam or an electron beam. The irradiation melts the metal. Then, the metal solidifies. The melting and the solidifying allow the particles in the powder to be bound together and form a new bound layer. The new bound layer is bound to the existing bound layer.


Repeating the binding by irradiation grows an aggregate of bound layers gradually. This growth enables a shaped object having a three-dimensional shape to be obtained. The additive manufacturing process enables a shaped object having a complicated shape to be easily obtained.


A thermal spraying process is used for the formation of a metal coating layer. In thermal spraying processes, powder particles are accelerated. The acceleration is carried out using compressed gas and the like. The particles that are accelerated and are traveling are heated by a heating means. Examples of heating means include gas combustion flame, plasma, laser, and the like. The heating turns the particles into the molten state or the semi-molten state. These particles are collided against an object and solidified. By the solidifying, the particles are bound together. The particles are also bound to a base material. By the binding, a coating layer is formed. The metal powder may be heated after it is collided against an object. The metal powder may be heated while in contact with an object. A thermal spraying process by which a thick coating layer is formed is also referred to as a padding process. A thermal spraying process by which particles are heated with laser is also referred to as a laser coating process and in addition as a laser thermal spraying process.


Metal powder used for additive manufacturing processes, thermal spraying processes, padding processes, laser coating processes, and the like is produced by a water atomization process, a gas atomization process, and the like. The properties of this metal powder have an impact on the handling properties. The properties of the metal powder further have an impact on the properties of a three-dimensional shaped object or a coating layer.


Japanese Patent Laid-Open Publication No. 2001-152204 (PTL 1) has disclosed a metal product that is a shaped object obtained by an additive manufacturing process and that is impregnated with a metal having a melting point lower than that of the shaped object. The impregnation increases the density of the metal product.


Japanese Patent Laid-Open Publication No. 2006-321711 (PTL 2) has disclosed a metal powder having an arithmetic mean circularity of 0.7 or more. The surfaces of the particles of this powder are covered with aggregation prevention particles. This powder is less likely to cause aggregation. This powder has excellent handling properties. A shaped object obtained from this powder has a high density. This shaped object has excellent strength.


Japanese Patent Laid-Open Publication No. 2011-21218 (PTL 3) has disclosed a powder including a laser absorbent. A shaped object obtained from this powder has excellent strength.


CITATION LIST
Patent Literature

[PTL 1] Japanese Patent Laid-Open Publication No. 2001-152204


[PTL 2] Japanese Patent Laid-Open Publication No. 2006-321711


[PTL 3] Japanese Patent Laid-Open Publication No. 2011-021218


SUMMARY OF THE INVENTION
Technical Problem

An increasingly higher performance is demanded by powders used for additive manufacturing processes, thermal spraying processes, padding processes, laser coating processes, and the like.


An object of the present invention is to provide a powder having a variety of excellent performances.


Solution to Problem

The metal powder according to the present invention is composed of many spherical particles. This powder includes at least one of Ni, Fe, and Co. The total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more. The metal powder has a cumulative 10 vol % particle size D10 of 1.0 μm or more. The powder has a value Y of 7.5 to 24.0 as calculated by the following mathematical equation:

Y=D50×ρ×S


wherein D50 represents a cumulative 50 vol % particle size of the powder, ρ represents a true density of the powder, and S represents a specific surface area of the powder.


In a preferred aspect of the metal powder according to the present invention, the balance other than the three kinds that are Ni, Fe, and Co includes: at least one of C, Si, Cr, Mo, Al, Ti, V, W, Nb, Zn, Ta, B, Ag, Cu, and Sn; and an unavoidable impurity.


In a preferred aspect of the metal powder according to the present invention, a ratio of a cumulative 60 vol % particle size D60 to a particle size D10 (D60/D10) is 1.0 or more and less than 10.0.


In a preferred aspect of the metal powder according to the present invention, a ratio of a particle size D50 to a mode diameter Dm (D50/Dm) is 0.80 to 1.20.


In a preferred aspect of the metal powder according to the present invention, a ratio P2 of the number of particles having a circularity of 0.95 or more to the total number of the particles is 50% or more. This ratio P2 is more preferably 80% or more.


In a preferred aspect of the metal powder according to the present invention, the metal powder has an oxygen concentration of less than 1000 ppm.


Two or more of the above-described preferred aspects of the metal powder according to the present invention may be combined.


Advantageous Effects of Invention

The powder according to the present invention has a Y value of 7.5 to 24.0. This powder has excellent handling properties. A shaped object obtained from this powder has high strength. A coating layer obtained from this powder has excellent wear resistance.







DETAILED DESCRIPTION OF THE INVENTION

The metal powder according to the present invention is an aggregate of many particles. The shape of each particle is spherical. In the present invention, “spherical particles” encompass truly spherical particles and particles having a nearly spherical shape.


The particles included in the metal powder according to the present invention include at least one of Ni, Fe, and Co. The particles may include only one of Ni, Fe, and Co. The particles may include only Ni and Fe. The particles may include only Fe and Co. The particles may include only Co and Ni. The particles may include all of Ni, Fe, and Co.


Preferred examples of materials of the particles included in the metal powder according to the present invention include SUS316, SUS630, ALLOYC276, ALLOY718, ALLOY-No. 6, and ALLOY-No. 20.


In the metal powder according to the present invention, the total content (T.C.) of Ni, Fe, and Co is 50 mass % or more. Ni is suitable for applications that require high corrosion resistance, Fe is suitable for applications that require high strength, and Co is suitable for applications that require high corrosion resistance and a high wear resistance. For a plurality of applications of interest, the powder may include two or more of Ni, Fe, and Co. The total content (T.C.) is particularly preferably 70 mass % or more. The total content (T.C.) may be 100 mass %.


The particles included in the metal powder according to the present invention may include other elements. Examples of such other elements include:


(1) elements that can contribute to enhanced strength, such as C, Mg, Al, Ti, V, Mn, Zn, and B;


(2) elements that contribute to machinability, such as S, P, Bi, and Sb;


(3) elements that can contribute to wear resistance, such as C, Cr, W, Mo, N, and B;


(4) elements that can contribute to corrosion resistance, such as Cr, Ag, Cu, Zr, Nb, Mo, Ta, W, and Sn; and


(5) elements that can contribute to magnetic properties, such as Si, Ge, Hf, La, Ce, Nd, Pr, Gd, Tb, Dy, Yb, and Y.


The particles may include an unavoidable impurity.


Preferably, the balance other than the three kinds that are Ni, Fe, and Co includes: at least one of C, Si, Cr, Mo, Al, Ti, V, W, Nb, Zn, Ta, B, Ag, Cu, and Sn; and an unavoidable impurity.


In the present invention, a value Y is calculated by the following mathematical equation (1):

Y=D50×ρ×S


wherein D50 represents a cumulative 50 vol % particle size (m) of the powder, ρ represents a true density (kg/m3) of the powder, and S represents a specific surface area (m2/kg) of the powder. A value Y is 7.5 to 24.0.


The metal powder according to the present invention has a cumulative 10 vol % particle size D10 of 1.0 μm or more.


When the particles are truly spherical, the diameter d1, surface area S1, and density ρ thereof satisfy the following mathematical equation:

d1=6/(ρ×S1)


Particles having irregularities on the surface thereof have a larger surface area S1, compared to truly spherical particles. Accordingly, a diameter d of a particle having irregularities on the surface thereof is smaller, compared to that of a truly spherical particle. When particles have a diameter d1 that is small, this diameter d1 is different from the apparent diameter. For a powder, which is an aggregate of particles, an average value per mass of surface areas of individual particles is expressed as a specific surface area S.


Accordingly, a value d calculated by the following mathematical equation represents an average value of the diameters of the powder.

d=6/(ρ×S)


A powder whose particles are all truly spherical has a particle size D50 that is equal to a diameter d. In another case in which particles have irregularities, the particle size D50 is larger than the diameter d. The present inventors have intensively studied and consequently found that a powder having a (d/D50) value of 0.25 to 0.8 has excellent fluidity. A powder having a (d/D50) value of 0.25 to 0.8 has a value Y of 7.5 to 24.0.


A powder having a value Y in the above-described range has particles whose surface irregularities are small. This powder has excellent fluidity. Thus, this powder has excellent handling properties. A shaped object obtained from this powder has high strength. A coating layer obtained from this powder has excellent wear resistance.


The true density ρ of a powder refers to a density whose denominator is a volume that does not include surface pores nor inside voids and is only the volume occupied by the solid itself. The true density ρ is derived by a gas displacement method. Examples of the measurement devices include a dry-type automated densimeter “AccuPyc 111340” available from Shimadzu Corporation.


The specific surface area S of a powder means a surface area per unit mass. The specific surface area S is derived by a gas adsorption method. Examples of the measurement devices include a flow-type automated specific surface area analyzer “FlowSorb 1112305” available from Shimadzu Corporation.


For the metal powder according to the present invention, a ratio of a cumulative 60 vol % particle size D60 to a particle size D10 (D60/D10) is preferably 1.0 or more and less than 10.0. When powder is packed, particles having a small diameter come between particles having a large diameter. A powder having an excessively large amount of particles having a small diameter has poorer fluidity. Such a powder has poorer spreading properties. A powder having an excessively small amount of particles having a small diameter has a large volume shrinkage factor during melting. The present inventors have intensively studied and consequently found that a powder having a ratio (D60/D10) of 1.0 or more and less than 10.0 has both spreading properties and a low shrinkage factor. The ratio (D60/D10) is preferably 2.0 or more, particularly preferably 5.0 or more. The ratio (D60/D10) is preferably 8.0 or less, particularly preferably 6.0 or less.


In the measurement of the particle sizes D10, D50, and D60 of a powder, a cumulative curve is determined, given that the whole volume of powder is 100%. The particle size for the point of a cumulative volume of 10% on this curve is D10. The particle size for the point of a cumulative volume of 50% on this curve is D50. The particle size for the point of a cumulative volume of 60% on this curve is D60. The particle sizes D10, D50, and D60 are measured by a laser diffraction scattering method. Examples of devices suitable for this measurement include a laser diffraction scattering particle size distribution analyzer “Microtrac MT3000” available from Nikkiso Co., Ltd. Powder together with pure water is poured into the cell of this analyzer, and particle sizes are detected on the basis of light scattering information of the particles.


For the metal powder according to the present invention, a ratio of a particle size D50 to a mode diameter Dm (D50/Dm) is preferably 0.80 to 1.20. The particle size distribution of powder having the ratio (D50/Dm) in this range is near a logarithmic normal distribution. This powder has excellent fluidity. Thus, this powder has excellent handling properties. A shaped object obtained from this powder has high strength. A coating layer obtained from this powder has excellent wear resistance. From these viewpoints, the ratio (D50/Dm) is more preferably 0.85 to 1.15, particularly preferably 0.90 to 1.10.


In the measurement of a mode diameter Dm, a frequency curve of a particle size distribution is determined on the basis of volume. A particle size whose frequency is the largest on this frequency curve is the mode diameter Dm. A frequency curve of a particle size distribution is determined by a laser diffraction scattering method. Examples of devices suitable for this measurement include a laser diffraction scattering particle size distribution analyzer “Microtrac MT3000” available from Nikkiso Co., Ltd.


For the metal powder according to the present invention, a ratio P2 to the total number of the particles of the number of particles having a circularity of 0.95 or more is preferably 50% or more. This powder has excellent fluidity and packing properties. When this powder is used for additive manufacturing processes or thermal spraying processes, it can be spread smoothly and densely. Further, a shaped object and a coating layer obtained from this powder have excellent strength. From these viewpoints, the ratio P2 is more preferably 70% or more, particularly preferably 80% or more. As a method for measuring a circularity, an image analysis device is used. A photograph of a powder is taken from above, and a circularity is calculated from the outline of the powder using an image analysis device. When the powder is spherical having a circular outline, the circularity is 1, and when the powder has irregularities, the circularity is a figure that is 0 or more but less than 1.


The circularity Ro is calculated by the following mathematical equation:

Ro=S/L2


In this mathematical equation, S is the projection area of particles or their cross-section, and L is the outline length of this projection image. For the measurement of the projection area S and the outline length L, for example, an image analysis device is used.


The metal powder according to the present invention preferably has an oxygen concentration of less than 1000 ppm. This oxygen concentration correlates with the amount of oxides included in the powder. A shaped object and a coating layer obtained from this powder having an oxygen concentration of less than 1000 ppm have excellent strength. From these viewpoints, the oxygen concentration is particularly preferably 500 ppm or less. As a method for measuring oxygen concentrations, a dispersive infrared absorption method is used. Examples of the measurement devices include EMGA-930 available from Horiba Ltd.


Because the metal powder according to the present invention can be densely spread, the impregnation of a low-melting-point metal into a shaped object as disclosed in Japanese Patent Laid-Open Publication No. 2001-152204 is not needed. Even when a shaped object obtained from this powder is used in a high-temperature environment, there is no low-melting-point metal that causes melting. This shaped object is suitable for use in a high-temperature environment. Needless to say, the shaped object may be impregnated with a low-melting-point metal.


Because the metal powder according to the present invention has excellent fluidity, aggregation prevention particles as disclosed in Japanese Patent Laid-Open Publication No. 2006-321711 are not needed. In a powder that does not include aggregation prevention particles, there are no aggregation prevention particles that inhibit particles from being bound together. Thus, a shaped object and a coating layer obtained from this powder have excellent strength. Needless to say, this powder may include aggregation prevention particles.


Because a shaped object and a coating layer obtained from the metal powder according to the present invention have excellent strength, the mixing of a laser absorbent into this powder as disclosed in Japanese Patent Laid-Open Publication No. 2011-21218 is not needed. Thus, there is no defect generated that is due to a laser absorbent. Needless to say, this powder may have a laser absorbent mixed thereinto.


As above-described, the metal powder according to the present invention has a value Y of 7.5 to 24.0. The particles included in this powder has a nearly spherical shape. This powder has excellent fluidity and packing properties and hence causes smaller volume shrinkage during melting. A shaped object and a coating layer obtained from this powder have fewer holes. From this powder, a shaped object and a coating layer that have excellent strength can be obtained. From the viewpoint of strength, the value Y is more preferably 18.0 or less, particularly preferably 12.0 or less.


The particle size D10 is preferably 5 μm or more, particularly preferably 10 μm or more, from the viewpoint that particles are less likely to become satellites. The particle size D10 is preferably 15 μm or less.


From the viewpoint of the general-purpose properties for a shaped object and a coating layer, the particle size D50 is preferably 15 μm to 50 μm, particularly preferably 20 μm to 30 μm.


From the viewpoint of the general-purpose properties, the particle size D60 is preferably 18 μm to 70 μm, particularly preferably 24 μm to 45 μm.


The metal powder according to the present invention can be produced by various processes. Specific examples of the production processes include a water atomization process, a gas atomization process, a plasma atomization process, a rotating electrode process, a centrifugal atomization process, a melt spinning process, a mechanical pulverization process, and a chemical reduction process. Preferred production processes are a water atomization process, a gas atomization process, and a disc atomization process. In particular, a gas atomization process is preferable. A plurality of production processes may be combined. For example, a powder obtained by a water atomization process may be mechanically pulverized.


In an example of a water atomization process, a raw material is poured into a crucible having pores at the bottom. This raw material is heated by means of a high-frequency induction furnace under the atmosphere of the air, argon gas, or nitrogen gas, and is melted. Water is spouted against the raw material flowing out through the pores. The raw material is rapidly cooled and solidified to afford a powder.


In an example of a gas atomization process, a raw material is poured into a crucible having pores at the bottom. This raw material is heated by means of a high-frequency induction furnace under the atmosphere of the air, argon gas, or nitrogen gas, and is melted. Helium gas, argon gas, or nitrogen gas is spouted against the raw material flowing out through the pores. The raw material is rapidly cooled and solidified to afford a powder.


By controlling the conditions for atomization, a powder having a suitable Y value can be obtained. From a powder obtained by atomization, particles having a suitable particle size, density, and specific surface area may be selected. An example of selecting methods is sieving through meshes.


EXAMPLES

Below, the effects of the present invention will be clarified by Examples, but the present invention is not to be construed in a limited manner on the basis of the description of the Examples.


For Examples and Comparative Examples, various parameters relating to a metal powder were determined as follows.


[Particle Sizes D10, D50, and D60, and Mode Diameter Dm]


The particle sizes D10, D50, and D60, and mode diameter Dm were determined on the basis of a particle size distribution measured by a laser diffraction scattering method using a laser diffraction scattering particle size distribution analyzer “Microtrac MT3000” available from Nikkiso Co., Ltd. In measuring a particle size distribution using the Microtrac MT3000, powder together with pure water is poured into the cell of this analyzer, and particle sizes are detected on the basis of light scattering information of the particles.


[True Density ρ]


The true density ρ was measured by a gas displacement method using a dry-type automated densimeter “AccuPyc II1340” available from Shimadzu Corporation.


[Specific Surface Area S]


The specific surface area S was measured by a gas adsorption method using a flow-type automated specific surface area analyzer “FlowSorb III2305” available from Shimadzu Corporation.


[Value Y]


The value Y was calculated by the following equation:

Y=D50×ρ×S


wherein D50 represents a cumulative 50 vol % particle size of the powder, ρ represents a true density of the powder, and S represents a specific surface area of the powder.


[Ratio P2]


For the circularity of powder, 500 particles were each measured for circularity using an image analysis device, the number of the particles having a circularity of 0.95 or more was measured, and the ratio that the number accounts for with respect to the total number was P2.


[Oxygen Concentration]


The oxygen concentration of powder was measured by a dispersive infrared absorption method using an analyzer “EMGA-930” available from Horiba Ltd.


[Experiment 1]


[Provision of Alloy]


The alloys having the compositions I to IX shown in the following Table 1 were provided. Here, in Table 1, “Bal.” means the balance.









TABLE 1







Composition (mass %)



























C
Si
Ni
Cr
Mo
Al
Ti
V
W
Nb
Co
Fe
Zn
Ta
B
Ag
Cu
Sn
T.C.






























I











Bal.






100.0


II
0.1

4.0
16.3





0.3

Bal.






83.3


III
0.1

18.0 

5.1
0.1
0.8



9.0
Bal.






93.9


IV


Bal.















100.0


V


Bal.
15.2
15.6 
0.2


3.7

0.8
5.5






65.3


VI
0.1

Bal.

4.5
6.0
2.8


5.5


0.1
2.3




78.7


VII










Bal.







100.0


VIII
2.5

1.3
29.5
0.8



13.5 

Bal.







53.7


IX
1.7







9.0
10.0 
Bal.


5.0




74.3





T.C.: the total of Ni, Fe, and Co







[Production of Powder]


From 9 kinds of alloy shown in Table 1, metal powders of Examples 1 to 162 and Comparative Examples 1 to 54 shown in Tables 2 to 10 were obtained. Each powder was obtained by classifying many particles with a sieve. The particles were obtained by a water atomization process, a gas atomization process, or a disc atomization process. As shown below, the powders were each measured for flow rate in accordance with the specification of “JIS Z 2502”, and evaluated for fluidity. This fluidity correlates with the strengths of a shaped object and a coating layer.


[Composition I]


The powders of Examples 1 to 18 and Comparative Examples 1 to 6 obtained from the alloy having the composition I were measured for flow rate, and rated in accordance with the following criteria:


S: less than 20.0 s/50 g


A: 20.0 s/50 g or more, less than 22.0 s/50 g


B: 22.0 s/50 g or more, less than 24.0 s/50 g


C: 24.0 s/50 g or more, less than 26.0 s/50 g


F: 26.0 s/50 g or more (or not flowing)


These results are shown in the following Table 2.









TABLE 2







Evaluation Results






















Specific












D50
ρ
Surface Area
D10
D60



P2
Oxygen Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 1
74.7
7970
36.6
22.4
79.2
21.8
0.61
3.5
51.7
220
22.7
B


Example 2
44.1
7730
69.2
17.6
49.0
23.6
0.79
2.8
65.3
150
23.3
B


Example 3
43.2
7990
25.8
8.6
47.1
8.9
0.65
5.5
60.5
400
22.7
B


Example 4
37.9
7870
23.5
11.4
42.1
7.0
1.32
3.7
58.0
340
22.6
B


Example 5
63.9
8010
13.5
25.6
69.0
6.9
1.49
2.7
56.5
570
24
B


Example 6
80.9
7930
28.2
24.3
86.6
18.1
1.43
3.6
70.7
290
23
B


Example 7
31.5
7800
55.4
12.6
33.4
13.6
1.11
2.7
54.4
960
20.9
A


Example 8
93.5
7850
13.2
37.4
100.0
9.7
1.05
2.7
72.8
210
20.2
A


Example 9
26.0
7710
93.3
5.2
27.8
18.7
0.84
5.4
62.3
90
20.7
A


Example 10
83.6
7810
12.7
25.1
96.1
8.3
0.89
3.8
58.3
320
21.8
A


Example 11
49.4
7980
22.1
14.8
54.8
8.7
1.37
3.7
95.9
560
18.4
S


Example 12
96.2
8010
10.1
38.5
109.7
7.8
1.00
2.9
84.7
710
19.6
S


Example 13
19.7
7770
86.2
3.9
22.7
13.2
0.84
5.8
86.7
430
19.5
S


Example 14
50.9
7910
57.9
10.2
56.0
23.3
1.18
5.5
89.6
920
18.1
S


Example 15
99.4
7880
19.9
19.9
104.4
15.6
0.78
5.3
84.3
1190
25.5
C


Example 16
59.3
7940
23.4
17.8
64.6
11.0
1.39
3.6
51.9
1060
24.3
C


Example 17
77.4
7930
38.6
31.0
82.0
23.7
0.94
2.7
56.5
1840
24.6
C


Example 18
37.6
7790
49.8
11.3
41.4
14.6
0.98
3.7
78.3
2100
24.6
C


Comparative
91.6
7990
63.1
27.5
96.2
46.2
1.07
3.5
78.0
950
26.3
F


Example 1














Comparative
28.4
7780
129.3
8.5
31.2
28.6
1.24
3.7
88.4
30
not flowing
F


Example 2














Comparative
74.8
7730
47.2
29.9
86.0
27.3
1.02
2.9
88.5
220
26.5
F


Example 3














Comparative
27.7
7840
276.3
0.5
30.7
60.0
1.50
61.5
90.2
380
not flowing
F


Example 4














Comparative
13.9
7980
200.3
0.5
14.6
22.2
1.34
29.2
60.2
800
29.6
F


Example 5














Comparative
38.7
7770
221.7
0.5
43.0
66.7
1.39
85.9
67.0
630
26.9
F


Example 6










[Composition II]


The powders of Examples 19 to 36 and Comparative Examples 7 to 12 obtained from the alloy having the composition II were measured for flow rate, and rated in accordance with the following criteria:


S: less than 21.0 s/50 g


A: 21.0 s/50 g or more, less than 23.0 s/50 g


B: 23.0 s/50 g or more, less than 25.0 s/50 g


C: 25.0 s/50 g or more, less than 27.0 s/50 g


F: 27.0 s/50 g or more (or not flowing)


These results are shown in the following Table 3.









TABLE 3







Evaluation Results






















Specific






Oxygen





D50
ρ
Surface Area
D10
D60




Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
P2 (%)
(ppm)
(s/50 g)
Evaluation






















Example 19
85.2
7860
31.8
17.0
92.9
21.3
0.48
5.5
66.1
816
24.5
B


Example 20
21.0
7830
108.3
4.2
23.5
17.8
0.47
5.6
63.3
881
24.7
B


Example 21
40.7
7880
68.3
9.8
45.6
21.9
0.74
4.7
62.6
720
24.9
B


Example 22
21.7
7710
56.8
4.6
23.4
9.5
1.34
5.1
83.9
948
23.4
B


Example 23
62.1
7900
28.7
14.3
68.3
14.1
1.37
4.8
80.0
113
24.2
B


Example 24
50.1
7720
22.5
11.0
55.6
8.7
1.48
5.0
88.3
945
23.7
B


Example 25
87.8
7940
32.7
22.8
94.8
22.8
1.02
4.2
77.4
562
22.5
A


Example 26
75.2
7910
32.1
19.6
82.0
19.1
1.18
4.2
69.2
227
22.7
A


Example 27
65.1
7950
40.8
16.9
69.0
21.1
0.86
4.1
88.7
907
21.5
A


Example 28
84.5
7810
10.5
25.4
92.1
6.9
0.82
3.6
57.7
719
22.4
A


Example 29
80.8
7840
17.7
19.4
87.3
11.2
1.01
4.5
97.0
661
19
S


Example 30
19.8
7780
110.4
4.8
22.4
17.0
0.83
4.7
91.1
160
19.3
S


Example 31
48.8
7830
46.3
11.7
51.7
17.7
1.01
4.4
94.5
693
20.5
S


Example 32
61.1
7950
44.9
14.7
66.0
21.8
0.91
4.5
96.4
926
19.1
S


Example 33
63.3
7760
42.1
19.0
68.4
20.7
1.00
3.6
57.7
1108
26.6
C


Example 34
99.7
7840
8.6
24.9
108.7
6.7
0.94
4.4
53.3
2198
25.4
C


Example 35
23.8
7700
42.6
7.1
25.9
7.8
1.10
3.6
87.7
1665
25.9
C


Example 36
34.0
7660
66.8
9.2
36.7
17.4
0.81
4.0
96.2
1293
25.7
C


Comparative
84.5
7720
46.6
16.9
97.2
30.4
1.05
5.8
78.0
781
25.1
F


Example 7














Comparative
25.5
7650
177.9
7.4
27.5
34.7
1.00
3.7
88.4
784
25.1
F


Example 8














Comparative
57.6
7940
69.5
15.6
65.7
31.8
1.09
4.2
88.5
191
26.4
F


Example 9














Comparative
29.4
7890
52.2
0.5
31.2
12.1
0.98
62.3
90.2
827
26.1
F


Example 10














Comparative
15.4
7930
107.3
0.5
16.2
13.1
1.40
32.3
60.2
510
not flowing
F


Example 11














Comparative
96.1
7880
19.3
0.5
104.7
14.6
1.15
209.5
67.0
123
25.7
F


Example 12










[Composition III]


The powders of Examples 37 to 54 and Comparative Examples 13 to 18 obtained from the alloy having the composition III were measured for flow rate, and rated in accordance with the following criteria:


S: less than 21.0 s/50 g


A: 21.0 s/50 g or more, less than 23.0 s/50 g


B: 23.0 s/50 g or more, less than 25.0 s/50 g


C: 25.0 s/50 g or more, less than 27.0 s/50 g


F: 27.0 s/50 g or more (or not flowing)


These results are shown in the following Table 4.









TABLE 4







Evaluation Results






















Specific












D50
ρ
Surface Area
D10
D60



P2
Oxygen Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 37
85.9
8360
18.8
24.9
97.9
13.5
0.55
3.9
85.4
576
20.8
B


Example 38
81.2
8110
25.2
21.1
90.9
16.6
0.60
4.3
62.6
325
19.1
B


Example 39
19.0
8420
145.6
4.4
20.1
23.3
0.64
4.6
55.8
403
19.6
B


Example 40
63.2
8290
22.1
15.8
68.3
11.6
1.34
4.3
69.3
731
20.8
B


Example 41
25.5
8370
70.7
5.4
26.8
15.1
1.29
5.0
70.9
425
19.9
B


Example 42
89.1
8420
18.9
24.9
98.0
14.2
1.33
3.9
79.6
114
19.4
B


Example 43
79.4
8130
17.0
23.0
83.4
11.0
1.02
3.6
80.8
272
18.9
A


Example 44
46.1
8100
22.8
11.1
48.4
8.5
1.08
4.4
59.2
893
18.1
A


Example 45
84.7
8240
32.2
19.5
95.7
22.5
0.98
4.9
69.4
212
18.3
A


Example 46
80.1
8270
20.1
24.0
86.5
13.3
0.96
3.6
66.3
435
17.9
A


Example 47
69.7
8290
22.7
16.7
79.5
13.1
1.19
4.8
95.9
677
15.4
S


Example 48
16.4
8260
50.9
3.8
17.4
6.9
0.94
4.6
94.1
585
15.8
S


Example 49
84.2
8140
12.3
25.3
90.9
8.4
1.01
3.6
94.3
177
15.6
S


Example 50
33.7
8310
23.2
6.7
37.7
6.5
0.82
5.6
92.0
268
15.9
S


Example 51
69.2
8290
24.6
19.4
78.2
14.1
0.81
4.0
55.3
1769
21.5
C


Example 52
24.5
8430
75.0
7.4
27.7
15.5
0.96
3.8
68.3
2291
22.7
C


Example 53
88.5
8350
30.9
19.5
94.7
22.8
0.86
4.9
59.0
2435
21.9
C


Example 54
55.9
8330
42.5
11.2
59.3
19.8
1.00
5.3
90.7
2154
22.3
C


Comparative
61.8
8180
66.1
14.2
68.0
33.4
1.06
4.8
78.0
441
not flowing
F


Example 13














Comparative
62.3
8140
61.9
18.1
66.7
31.4
1.47
3.7
88.4
624
24.2
F


Example 14














Comparative
90.0
8290
37.8
19.8
100.8
28.2
0.68
5.1
88.5
551
not flowing
F


Example 15














Comparative
62.3
8420
43.8
0.5
69.8
23.0
1.04
139.6
90.2
291
23.5
F


Example 16














Comparative
57.8
8130
51.1
0.5
64.7
24.0
1.13
129.5
60.2
712
not flowing
F


Example 17














Comparative
57.6
8430
41.8
0.5
64.5
20.3
1.38
129.0
67.0
753
24.7
F


Example 18










[Composition IV]


The powders of Examples 55 to 72 and Comparative Examples 19 to 24 obtained from the alloy having the composition IV were measured for flow rate, and rated in accordance with the following criteria:


S: less than 17.0 s/50 g


A: 17.0 s/50 g or more, less than 19.0 s/50 g


B: 19.0 s/50 g or more, less than 21.0 s/50 g


C: 21.0 s/50 g or more, less than 23.0 s/50 g


F: 23.0 s/50 g or more (or not flowing)


These results are shown in the following Table 5.









TABLE 5







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 55
37.7
8830
47.5
10.9
41.1
15.8
0.72
3.8
71.7
264
28.4
B


Example 56
15.3
8740
68.1
4.6
16.2
9.1
0.48
3.5
65.0
914
27.8
B


Example 57
66.2
8970
31.2
14.6
74.8
18.5
0.71
5.1
84.7
858
28.5
B


Example 58
35.0
8760
77.3
7.4
38.2
23.7
1.41
5.2
65.9
150
27.4
B


Example 59
59.5
8820
24.2
17.3
64.3
12.7
1.26
3.7
63.4
745
27.3
B


Example 60
73.0
8880
16.0
16.8
77.4
10.4
1.43
4.6
83.7
761
29
B


Example 61
87.7
8940
17.5
20.2
98.2
13.7
0.97
4.9
88.1
339
26
A


Example 62
39.7
8900
34.8
11.9
44.1
12.3
1.09
3.7
83.9
753
26.8
A


Example 63
50.3
8780
36.2
12.6
53.8
16.0
0.97
4.3
72.8
553
25.8
A


Example 64
73.8
8970
22.7
17.0
79.0
15.0
1.15
4.7
64.6
807
25.5
A


Example 65
60.9
8980
42.8
12.8
68.8
23.4
0.90
5.4
96.5
629
23.7
S


Example 66
85.6
8840
29.3
17.1
91.6
22.2
1.02
5.4
93.8
644
23.7
S


Example 67
36.7
9000
71.1
11.0
41.8
23.5
1.15
3.8
92.3
162
23.2
S


Example 68
62.7
8930
25.2
15.0
69.0
14.1
0.88
4.6
91.8
626
23.7
S


Example 69
28.2
8940
34.5
7.9
31.9
8.7
1.00
4.0
66.6
1412
30.9
C


Example 70
44.7
8890
18.9
12.1
46.9
7.5
0.99
3.9
53.6
1729
29.3
C


Example 71
47.6
8880
51.1
13.8
53.8
21.6
0.82
3.9
56.2
2326
29.4
C


Example 72
30.4
8800
48.6
7.0
33.4
13.0
0.94
4.8
55.6
1983
30.8
C


Comparative
15.6
8790
238.5
4.2
17.8
32.7
0.91
4.2
78.0
219
32
F


Example 19














Comparative
69.4
8820
46.4
16.7
79.1
28.4
0.94
4.8
88.4
115
32.2
F


Example 20














Comparative
28.6
8900
136.3
7.7
32.6
34.7
0.90
4.2
88.5
440
33.3
F


Example 21














Comparative
55.8
8940
12.6
0.5
59.1
6.3
0.97
118.3
90.2
314
not flowing
F


Example 22














Comparative
83.7
8940
29.4
0.5
93.7
22.0
0.93
187.5
60.2
787
34
F


Example 23














Comparative
20.7
8750
112.6
0.5
22.4
20.4
1.01
44.7
67.0
204
31.9
F


Example 24










[Composition V]


The powders of Examples 73 to 90 and Comparative Examples 25 to 30 obtained from the alloy having the composition V were measured for flow rate, and rated in accordance with the following criteria:


S: less than 25.0 s/50 g


A: 25.0 s/50 g or more, less than 27.0 s/50 g


B: 27.0 s/50 g or more, less than 29.0 s/50 g


C: 31.0 s/50 g or more, less than 33.0 s/50 g


F: 33.0 s/50 g or more (or not flowing)


These results are shown in the following Table 6.









TABLE 6







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 73
52.4
9030
17.5
11.5
55.0
8.3
0.56
4.8
83.8
478
18.5
B


Example 74
95.2
9170
16.0
23.8
100.0
14.0
0.72
4.2
63.7
936
17.4
B


Example 75
69.6
9050
37.6
16.7
80.0
23.7
0.55
4.8
68.2
321
17.7
B


Example 76
90.4
9240
9.1
20.8
100.3
7.6
1.30
4.8
77.3
279
18.7
B


Example 77
86.6
9290
13.5
25.1
91.8
10.9
1.21
3.7
76.1
215
18.8
B


Example 78
34.8
9300
69.8
10.4
36.5
22.6
1.34
3.5
59.1
524
18
B


Example 79
42.3
9040
48.6
11.8
47.0
18.6
1.08
4.0
63.4
206
16.8
A


Example 80
77.5
9330
12.4
18.6
86.8
9.0
1.16
4.7
82.9
942
16.8
A


Example 81
83.1
9210
13.6
18.3
88.1
10.4
1.11
4.8
63.4
635
16
A


Example 82
54.8
9230
32.4
13.7
58.1
16.4
1.04
4.2
79.5
864
16.4
A


Example 83
49.0
9130
38.7
11.8
51.9
17.3
0.89
4.4
92.4
699
13.2
S


Example 84
72.6
9100
10.0
14.5
81.3
6.6
1.05
5.6
91.6
364
13.5
S


Example 85
44.6
9270
23.9
12.0
46.8
9.9
0.95
3.9
94.9
685
13.5
S


Example 86
81.3
9180
17.8
23.6
93.5
13.3
1.02
4.0
95.5
587
14.3
S


Example 87
57.1
9300
30.7
17.1
63.4
16.3
0.93
3.7
63.0
2286
19.9
C


Example 88
92.1
9240
13.3
19.3
102.2
11.3
0.86
5.3
74.5
1925
20.7
C


Example 89
24.3
9040
47.3
5.1
27.0
10.4
0.86
5.3
71.2
2260
20.5
C


Example 90
64.3
9340
17.2
16.1
69.4
10.3
1.15
4.3
55.2
1554
20.4
C


Comparative
31.6
9040
105.0
9.2
33.2
30.0
0.79
3.6
78.0
177
22.7
F


Example 25














Comparative
78.7
9130
36.9
15.7
88.1
26.5
1.35
5.6
88.4
767
23.8
F


Example 26














Comparative
46.7
9090
60.1
9.3
49.0
25.5
1.03
5.3
88.5
524
not flowing
F


Example 27














Comparative
46.4
9240
38.5
0.5
52.4
16.5
0.81
104.9
90.2
205
24.4
F


Example 28














Comparative
20.3
9350
121.2
0.5
23.1
23.0
0.74
46.3
60.2
155
24.9
F


Example 29














Comparative
56.3
9200
35.7
0.5
63.6
18.5
0.76
127.2
67.0
899
not flowing
F


Example 30










[Composition VI]


The powders of Examples 91 to 108 and Comparative Examples 31 to 36 obtained from the alloy having the composition VI were measured for flow rate, and rated in accordance with the following criteria:


S: less than 15.0 s/50 g


A: 15.0 s/50 g or more, less than 17.0 s/50 g


B: 17.0 s/50 g or more, less than 19.0 s/50 g


C: 21.0 s/50 g or more, less than 23.0 s/50 g


F: 23.0 s/50 g or more (or not flowing)


These results are shown in the following Table 7.









TABLE 7







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 91
99.1
8520
9.7
21.8
108.0
8.2
0.46
5.0
85.4
383
30.6
B


Example 92
61.9
8480
28.2
18.0
67.5
14.8
0.62
3.8
61.8
648
30.7
B


Example 93
36.8
8630
74.6
9.9
39.4
23.7
0.73
4.0
82.0
537
29.8
B


Example 94
43.0
8510
46.5
12.5
45.6
17.0
1.36
3.7
55.5
919
30.3
B


Example 95
81.2
8460
13.0
24.4
87.7
8.9
1.47
3.6
58.7
598
29.4
B


Example 96
88.6
8720
17.6
22.2
93.9
13.6
1.25
4.2
74.2
820
29.7
B


Example 97
65.0
8780
36.1
15.0
74.1
20.6
0.97
5.0
79.5
659
27.1
A


Example 98
35.8
8620
48.0
10.7
40.8
14.8
1.12
3.8
76.9
658
28.5
A


Example 99
63.2
8590
27.3
16.4
67.6
14.8
1.00
4.1
75.0
642
27.4
A


Example 100
92.6
8460
14.8
25.9
104.6
11.6
0.92
4.0
63.2
630
27.6
A


Example 101
95.4
8500
11.1
20.0
104.9
9.0
1.00
5.2
92.9
754
26.8
S


Example 102
43.1
8470
21.1
10.8
47.8
7.7
1.11
4.4
92.9
259
25.3
S


Example 103
94.0
8740
28.1
22.6
103.4
23.1
0.81
4.6
97.1
351
25.2
S


Example 104
64.7
8690
40.4
17.5
74.4
22.7
0.93
4.3
95.0
344
26.8
S


Example 105
15.6
8720
164.7
4.7
17.3
22.4
0.99
3.7
80.4
2323
32.9
C


Example 106
96.7
8610
19.2
20.3
109.3
16.0
0.96
5.4
83.7
2469
32.3
C


Example 107
89.3
8690
20.1
25.9
99.1
15.6
0.83
3.8
83.5
2433
31.8
C


Example 108
15.2
8580
83.6
4.3
16.1
10.9
1.01
3.8
81.3
2082
31.3
C


Comparative
21.2
8540
159.6
6.1
22.9
28.9
0.91
3.7
78.0
374
not flowing
F


Example 31














Comparative
76.1
8710
43.8
19.8
81.4
29.0
0.82
4.1
88.4
849
not flowing
F


Example 32














Comparative
91.1
8690
36.8
21.0
98.4
29.1
0.71
4.7
88.5
437
not flowing
F


Example 33














Comparative
98.7
8620
19.7
0.5
109.6
16.8
1.35
219.1
90.2
903
35.7
F


Example 34














Comparative
42.2
8750
63.1
0.5
47.3
23.3
1.23
94.5
60.2
220
39.3
F


Example 35














Comparative
49.3
8730
54.4
0.5
53.7
23.4
1.41
107.5
67.0
277
39.1
F


Example 36










[Composition VII]


The powders of Examples 109 to 126 and Comparative Examples 37 to 42 obtained from the alloy having the composition VII were measured for flow rate, and rated in accordance with the following criteria:


S: less than 27.0 s/50 g


A: 27.0 s/50 g or more, less than 29.0 s/50 g


B: 29.0 s/50 g or more, less than 31.0 s/50 g


C: 33.0 s/50 g or more, less than 35.0 s/50 g


F: 35.0 s/50 g or more (or not flowing)


These results are shown in the following Table 8.









TABLE 8







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 109
22.5
9020
113.3
4.7
25.9
23.0
0.59
5.5
70.7
489
20.4
B


Example 110
41.5
8880
33.6
11.2
47.3
12.4
0.49
4.2
77.0
155
21.9
B


Example 111
59.1
8730
44.6
12.4
66.2
23.0
0.61
5.3
56.6
177
21.5
B


Example 112
76.5
8720
12.9
23.0
82.6
8.6
1.50
3.6
63.6
133
21.5
B


Example 113
91.7
9020
11.4
22.9
96.3
9.4
1.29
4.2
79.7
431
21.1
B


Example 114
27.1
8680
52.3
5.7
29.8
12.3
1.47
5.2
85.3
676
21.2
B


Example 115
51.6
8940
16.7
12.4
57.3
7.7
1.00
4.6
81.8
112
18.3
A


Example 116
18.8
8800
108.2
5.1
21.6
17.9
1.06
4.3
69.0
197
19.6
A


Example 117
90.7
8840
27.3
25.4
100.7
21.9
0.82
4.0
78.9
146
19.2
A


Example 118
60.0
8770
39.5
16.2
63.6
20.8
1.18
3.9
88.4
332
18.1
A


Example 119
45.4
8940
53.2
10.0
50.8
21.6
1.06
5.1
96.0
138
17.6
S


Example 120
49.8
8750
18.1
11.0
52.8
7.9
1.19
4.8
97.4
506
17.9
S


Example 121
45.0
8720
54.3
12.2
47.3
21.3
1.03
3.9
92.2
777
17.4
S


Example 122
77.3
8870
16.0
17.0
81.9
11.0
1.11
4.8
91.1
140
16.5
S


Example 123
68.8
8880
25.4
15.1
76.4
15.5
0.81
5.0
90.3
1128
23.8
C


Example 124
17.3
8950
87.8
5.0
18.7
13.6
1.05
3.7
57.8
1119
22.8
C


Example 125
36.9
8900
29.8
10.3
39.1
9.8
0.93
3.8
84.9
2136
22.5
C


Example 126
76.8
8740
17.0
18.4
81.4
11.4
0.99
4.4
55.3
1351
23.5
C


Comparative
55.8
8970
60.1
16.7
64.2
30.1
1.24
3.8
78.0
546
27.9
F


Example 37














Comparative
59.4
8970
56.1
12.5
67.1
29.9
1.46
5.4
88.4
787
27.1
F


Example 38














Comparative
89.7
8870
39.7
25.1
96.9
31.6
0.70
3.9
88.5
382
not flowing
F


Example 39














Comparative
23.6
8720
86.5
0.5
25.5
17.8
1.31
51.0
90.2
653
28
F


Example 40














Comparative
59.0
8980
15.7
0.5
62.0
8.3
0.94
123.9
60.2
562
not flowing
F


Example 41














Comparative
92.6
8960
17.0
0.5
101.9
14.1
0.92
203.7
67.0
171
28.3
F


Example 42










[Composition VIII]


The powders of Examples 127 to 144 and Comparative Examples 43 to 48 obtained from the alloy having the composition VIII were measured for flow rate, and rated in accordance with the following criteria:


S: less than 18.0 s/50 g


A: 18.0 s/50 g or more, less than 20.0 s/50 g


B: 20.0 s/50 g or more, less than 22.0 s/50 g


C: 22.0 s/50 g or more, less than 24.0 s/50 g


F: 24.0 s/50 g or more (or not flowing)


These results are shown in the following Table 9.









TABLE 9







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 127
55.8
10070
41.5
12.3
58.6
23.3
0.62
4.8
81.3
349
15.4
B


Example 128
17.2
9950
43.8
3.8
18.7
7.5
0.73
5.0
87.4
164
14.8
B


Example 129
50.4
9880
38.4
11.6
55.9
19.1
0.78
4.8
82.9
390
15.7
B


Example 130
71.7
9870
27.8
21.5
76.0
19.7
1.36
3.5
67.2
902
14.4
B


Example 131
48.0
9830
37.1
12.0
54.7
17.5
1.31
4.6
61.8
913
15.6
B


Example 132
65.0
10130
24.5
15.0
72.8
16.1
1.29
4.9
52.0
210
15.4
B


Example 133
34.3
9790
60.8
7.5
36.7
20.4
0.90
4.9
75.0
118
13.2
A


Example 134
54.9
9860
28.6
16.5
61.5
15.5
0.83
3.7
56.9
157
12.8
A


Example 135
64.5
9910
24.4
16.8
69.7
15.6
0.81
4.2
89.0
154
13.5
A


Example 136
68.8
9930
18.6
18.6
74.3
12.7
0.92
4.0
66.9
850
13.6
A


Example 137
77.7
10050
10.4
15.5
82.4
8.1
1.06
5.3
95.5
777
10.4
S


Example 138
55.8
10130
25.5
14.0
64.2
14.4
1.14
4.6
94.9
424
11.8
S


Example 139
61.9
9890
24.5
14.2
66.2
15.0
0.82
4.7
97.7
630
11.7
S


Example 140
29.7
9940
73.5
6.8
33.9
21.7
0.89
5.0
96.6
544
11.4
S


Example 141
29.1
10020
52.8
8.7
32.3
15.4
0.99
3.7
63.2
1265
16.2
C


Example 142
95.4
9760
7.3
23.9
108.8
6.8
1.11
4.6
84.8
2266
18
C


Example 143
43.0
9810
43.6
11.6
47.7
18.4
1.02
4.1
66.8
2302
16.3
C


Example 144
31.1
9940
50.8
7.2
35.5
15.7
1.13
5.0
51.9
2343
16.9
C


Comparative
98.0
9750
31.5
19.6
111.7
30.1
1.11
5.7
78.0
389
20.1
F


Example 43














Comparative
73.6
9790
46.6
19.9
79.5
33.6
1.49
4.0
88.4
196
21.9
F


Example 44














Comparative
50.8
9910
51.4
10.7
54.4
25.9
0.72
5.1
88.5
251
19.6
F


Example 45














Comparative
16.8
10050
119.0
0.5
18.0
20.1
0.77
36.0
90.2
429
not flowing
F


Example 46














Comparative
17.2
9870
96.6
0.5
18.2
16.4
1.39
36.5
60.2
165
24.8
F


Example 47














Comparative
26.1
10000
85.4
0.5
29.8
22.3
1.18
59.5
67.0
335
20.9
F


Example 48










[Composition IX]


The powders of Examples 145 to 162 and Comparative Examples 49 to 54 obtained from the alloy having the composition IX were measured for flow rate, and rated in accordance with the following criteria:


S: less than 12.0 s/50 g


A: 12.0 s/50 g or more, less than 14.0 s/50 g


B: 14.0 s/50 g or more, less than 16.0 s/50 g


C: 16.0 s/50 g or more, less than 18.0 s/50 g


F: 18.0 s/50 g or more (or not flowing)


These results are shown in the following Table 10.









TABLE 10







Evaluation Results






















Specific Surface






Oxygen





D50
ρ
Area
D10
D60



P2
Concentration
Fluidity
Overall



(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D60/D10
(%)
(ppm)
(s/50 g)
Evaluation






















Example 145
78.5
10080
26.7
16.5
87.1
21.1
0.54
5.3
60.0
381
15.1
B


Example 146
50.0
9880
14.4
14.0
53.0
7.1
0.67
3.8
88.7
150
16.4
B


Example 147
28.1
10070
39.9
7.6
29.8
11.3
0.57
3.9
66.2
214
15.4
B


Example 148
69.4
9980
33.8
13.9
73.6
23.4
1.44
5.3
51.5
365
15.5
B


Example 149
51.3
9970
15.4
11.8
54.9
7.9
1.38
4.7
72.4
909
15.2
B


Example 150
74.6
9920
21.2
15.7
80.6
15.7
1.35
5.1
64.1
567
15.7
B


Example 151
23.3
9870
103.1
6.8
25.2
23.7
0.83
3.7
81.3
697
13.7
A


Example 152
45.4
9920
20.4
10.0
47.7
9.2
0.81
4.8
80.1
143
14.9
A


Example 153
78.0
9890
10.6
21.1
88.9
8.2
0.86
4.2
66.5
453
13.4
A


Example 154
62.8
10120
14.2
18.2
71.6
9.0
1.04
3.9
77.1
158
14.3
A


Example 155
99.7
9900
19.5
19.9
106.7
19.2
1.06
5.4
91.3
146
11.4
S


Example 156
16.0
10080
71.3
4.5
16.8
11.5
1.19
3.8
95.0
534
12.9
S


Example 157
74.6
9970
15.3
17.9
80.6
11.4
0.82
4.5
96.3
520
11.5
S


Example 158
80.8
9890
19.0
19.4
92.1
15.2
0.91
4.8
97.0
696
12.9
S


Example 159
59.0
10060
21.6
15.9
67.9
12.8
1.00
4.3
80.0
1850
18.9
C


Example 160
62.2
9980
34.6
13.1
70.9
21.5
0.87
5.4
60.8
1409
18.4
C


Example 161
53.1
10150
37.9
15.9
58.9
20.4
1.05
3.7
97.7
1211
19
C


Example 162
18.4
10060
75.6
4.0
21.0
14.0
1.04
5.2
87.1
2269
17.2
C


Comparative
59.8
10020
45.6
13.2
68.8
27.3
1.35
5.2
78.0
516
not flowing
F


Example 49














Comparative
71.0
9880
41.8
15.6
74.6
29.3
1.28
4.8
88.4
387
24.2
F


Example 50














Comparative
79.2
9930
41.5
23.0
91.1
32.6
0.73
4.0
88.5
613
not flowing
F


Example 51














Comparative
48.6
9890
26.8
0.5
54.4
12.9
1.13
108.9
90.2
508
24.3
F


Example 52














Comparative
82.7
10140
21.1
0.5
92.6
17.7
1.49
185.2
60.2
807
not flowing
F


Example 53














Comparative
78.9
10010
16.1
0.5
87.6
12.7
1.35
175.2
67.0
464
20
F


Example 54









As shown in Tables 2 to 10, the overall evaluation of the powder of each Example was excellent. Form these results, the superiority of the present invention is obvious.


[Experiment 2]


[Provision of Alloy]


The alloys having the compositions I-1 to IX-2 shown in the following Table 11 were provided. Here, in Table 11, “Bal.” means the balance.









TABLE 11







Composition (mass %)



























C
Si
Ni
Cr
Mo
Al
Ti
V
W
Nb
Co
Fe
Zn
Ta
B
Ag
Cu
Sn
T.C.





I-1

3.0









Bal.






97.0


I-2











Bal.





0.1
99.9


II-1
0.1

4.0
16.3



0.5

0.3

Bal.






82.8


II-2
0.1

4.0
16.3





0.3

Bal.



0.3


83.0


III-1
0.1

18.0 

5.1
0.1
0.8



9.0
Bal.




2.0

91.9


III-2
0.1

18.0 

5.1
0.1
0.8



9.0
Bal.


0.2



93.7


IV-1


Bal.




5.0










95.0


IV-2


Bal.














2.0
98.0


V-1


Bal.
15.2
15.6 
0.2


3.7

0.8
5.5




3.0

62.3


V-2


Bal.
15.2
15.6 
0.2


3.7

0.8
5.5



0.5


64.8


VI-1
0.1
4.3
Bal.

4.5
6.0
2.8


5.5


0.1
2.3




74.4


VI-2
0.1

Bal.

4.5
6.0
2.8


5.5


0.1
2.3
1.2



77.5


VII-1










Bal.





15.4 

84.6


VII-2










Bal.






0.3
99.7


VIII-1
2.5
0.4
1.3
29.5
0.8



13.5 

Bal.







53.3


VIII-2
2.5

1.3
29.5
0.8



13.5 

Bal.




0.1


53.6


IX-1
1.7






2.2
9.0
10.0 
Bal.


5.0




72.2


IX-2
1.7







9.0
10.0 
Bal.


5.0
0.8



73.6





T.C.: the total of Ni, Fe, and Co







[Production of Powder]


From 18 kinds of alloy shown in Table 11, metal powders of Examples 163 to 252 and Comparative Examples 55 to 72 shown in Tables 12 to 14 were obtained. Each powder was obtained by classifying many particles with a sieve. The particles were obtained by a water atomization process, a gas atomization process, or a disc atomization process. As shown below, the powders were each measured for flow rate in accordance with the specification of “JIS Z 2502”, and evaluated for fluidity. This fluidity correlates with the strengths of a shaped object and a coating layer.


[Composition I-1, I-2, II-1, II-2, III-1, and III-2]


The powders of Examples 163 to 192 and Comparative Examples 55 to 60 were measured for flow rate, and rated in accordance with the following criteria:


S: less than 20.0 s/50 g


A: 20.0 s/50 g or more, less than 22.0 s/50 g


B: 22.0 s/50 g or more, less than 24.0 s/50 g


C: 24.0 s/50 g or more, less than 26.0 s/50 g


F: 26.0 s/50 g or more (or not flowing)


These results are shown in the following Table 12.









TABLE 12







Evaluation Results
























Specific















Surface






Oxygen






D50
ρ
Area
D10
D60


D60/
P2
Concentration
Fluidity
Overall



Composition
(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D10
(%)
(ppm)
(s/50 g)
Evaluation























Example 163
I-2
73.2
8440
21.7
18.0
79.1
13.4
0.61
4.4
39.4
430
22.4
B


Example 164
III-2
18.3
7800
65.9
2.8
19.4
9.4
0.79
7.0
47.3
680
22.6
B


Example 165
I-1
13.7
7910
183.6
1.6
14.9
19.9
0.65
9.1
39.6
430
22.5
B


Example 166
I-2
14.0
8030
72.9
1.9
14.7
8.2
1.32
7.9
41.6
920
23.9
B


Example 167
III-1
39.0
7590
43.9
20.0
42.1
13.0
1.49
2.1
45.5
690
23.9
B


Example 168
I-1
46.6
7800
54.7
12.0
49.4
19.9
1.43
4.1
46.4
740
22.6
B


Example 169
I-2
29.9
7590
50.2
6.5
31.7
11.4
2.43
4.9
36.1
360
23.0
B


Example 170
I-2
51.5
7870
26.2
6.0
55.1
10.6
3.43
9.2
46.1
860
22.1
B


Example 171
I-1
70.1
7590
19.4
8.2
75.0
10.3
4.43
9.1
43.8
790
22.9
B


Example 172
II-2
27.3
8530
87.2
8.8
29.8
20.3
1.11
3.4
76.8
320
20.1
A


Example 173
II-2
85.7
7830
18.8
13.0
92.6
12.6
1.05
7.1
54.1
530
20.0
A


Example 174
I-2
18.7
7590
137.4
10.9
19.6
19.5
0.84
1.8
61.1
300
20.5
A


Example 175
III-2
12.5
7950
96.6
1.5
13.4
9.6
0.89
8.9
69.9
780
20.4
A


Example 176
II-2
35.3
7910
73.8
5.6
37.4
20.6
1.89
6.7
72.4
850
20.2
A


Example 177
II-2
83.2
7670
32.3
17.3
88.2
20.6
2.89
5.1
72.6
770
21.5
A


Example 178
II-1
38.1
7750
31.2
6.3
40.0
9.2
3.89
6.3
59.0
470
21.9
A


Example 179
II-2
16.8
8440
150.9
5.8
18.0
21.4
1.37
3.1
91.6
230
18.5
S


Example 180
II-2
89.4
8280
19.3
14.1
94.8
14.3
1.00
6.7
82.2
780
19.3
S


Example 181
III-2
62.8
8440
42.6
20.5
67.8
22.6
0.84
3.3
86.5
890
19.1
S


Example 182
II-1
71.2
7750
23.7
13.5
78.3
13.1
1.18
5.8
85.2
310
18.1
S


Example 183
II-2
88.6
7750
16.0
25.9
95.7
11.0
2.18
3.7
86.2
240
19.7
S


Example 184
II-2
47.6
8110
39.6
14.7
51.4
15.3
3.18
3.5
85.9
350
19.7
S


Example 185
I-1
40.5
8200
32.5
10.0
42.9
10.8
4.18
4.3
85.4
880
19.4
S


Example 186
III-1
27.7
7980
69.2
7.1
30.5
15.3
0.78
4.3
82.1
2080
24.4
C


Example 187
I-1
36.2
7750
34.9
12.4
39.8
9.8
1.39
3.2
60.6
2110
24.5
C


Example 188
I-1
52.5
8060
34.3
17.7
56.7
14.5
0.94
3.2
52.0
1110
24.7
C


Example 189
II-1
70.0
7800
40.7
8.3
75.6
22.2
0.98
9.1
43.3
2180
24.8
C


Example 190
I-2
11.0
8360
90.3
1.7
12.0
8.3
1.98
7.0
46.0
1270
25.0
C


Example 191
II-1
10.6
7670
180.8
5.3
11.7
14.7
2.98
2.2
66.9
1880
25.3
C


Example 192
I-1
11.2
7910
241.6
3.5
12.2
21.4
3.98
3.5
68.6
1440
25.1
C


Comparative
I-1
70.3
7670
53.0
32.1
73.8
28.6
1.07
2.3
80.7
190
28.4
F


Example 55















Comparative
III-1
44.1
7640
73.3
7.3
47.2
24.7
1.24
6.5
41.6
440
not flowing
F


Example 56















Comparative
II-1
76.2
7980
66.4
14.4
80.8
40.4
1.02
5.6
48.5
250
27.3
F


Example 57















Comparative
II-2
33.0
8030
129.4
0.5
34.7
34.3
1.50
69.4
83.6
790
not flowing
F


Example 58















Comparative
I-1
79.8
8030
80.7
0.5
86.2
51.7
1.34
172.4
72.0
410
27.0
F


Example 59















Comparative
I-2
86.1
8030
70.3
0.5
93.8
48.6
1.39
187.6
70.7
790
28.8
F


Example 60










[Composition IV-1, IV-2, V-1, V-2, VI-1, and VI-2]


The powders of Examples 193 to 222 and Comparative Examples 61 to 66 were measured for flow rate, and rated in accordance with the following criteria:


S: 22.0 s/50 g or less


A: more than 22.0 s/50 g, 24.0 s/50 g or less


B: 24.0 s/50 g or more, 26.0 s/50 g or less


C: more than 26.0 s/50 g, 28.0 s/50 g or less


F: more than 28.0 s/50 g (or not flowing)


These results are shown in the following Table 13.









TABLE 13







Evaluation Results
























Specific















Surface






Oxygen






D50
ρ
Area
D10
D60


D60/
P2
Concentration
Fluidity
Overall



Composition
(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D10
(%)
(ppm)
(s/50 g)
Evaluation























Example 193
V-1
22.7
8880
114.6
6.4
25.0
23.1
0.61
3.9
41.8
620
24.8
B


Example 194
VI-2
55.0
8610
38.4
12.9
60.5
18.2
0.79
4.7
36.4
910
24.1
B


Example 195
VI-2
72.8
9010
22.0
40.2
76.4
14.4
0.65
1.9
37.0
320
24.1
B


Example 196
VI-2
60.4
9280
25.9
14.3
65.8
14.5
1.32
4.6
40.8
940
24.0
B


Example 197
IV-2
43.3
8700
60.8
5.0
46.8
22.9
1.49
9.4
47.3
410
25.8
B


Example 198
V-1
79.8
9010
14.9
17.8
83.8
10.7
1.43
4.7
39.7
650
24.9
B


Example 199
VI-2
40.9
8610
61.9
24.1
43.4
21.8
2.43
1.8
35.7
470
25.5
B


Example 200
V-1
73.0
9010
25.8
46.4
78.8
17.0
3.43
1.7
41.8
680
25.6
B


Example 201
IV-1
23.0
9100
51.1
6.2
24.2
10.7
4.43
3.9
41.7
750
24.5
B


Example 202
V-2
38.8
8790
51.0
13.3
42.7
17.4
1.11
3.2
58.9
590
24.0
A


Example 203
V-2
69.3
8790
14.6
9.2
74.2
8.9
1.05
8.1
52.2
150
24.0
A


Example 204
IV-1
31.1
8790
36.6
8.0
33.0
10.0
0.84
4.1
67.3
440
24.0
A


Example 205
V-1
86.9
8790
26.8
9.9
93.9
20.5
0.89
9.5
66.9
930
23.0
A


Example 206
IV-1
36.5
8880
48.1
12.3
39.4
15.6
1.89
3.2
63.3
940
23.7
A


Example 207
IV-2
72.0
9280
25.7
17.9
77.0
17.2
2.89
4.3
72.7
710
23.0
A


Example 208
IV-1
36.9
8530
29.9
12.5
38.7
9.4
3.89
3.1
67.3
800
22.7
A


Example 209
V-2
47.9
8910
30.9
8.1
50.8
13.2
1.37
6.3
89.4
400
21.0
S


Example 210
VI-1
25.0
8880
51.8
7.1
27.5
11.5
1.00
3.9
84.7
320
22.0
S


Example 211
VI-1
13.9
8700
125.7
1.8
14.7
15.2
0.84
8.4
91.8
490
20.4
S


Example 212
V-2
62.6
9010
15.8
15.3
68.9
8.9
1.18
4.5
86.8
700
20.1
S


Example 213
VI-2
56.5
8700
28.5
7.8
59.3
14.0
2.18
7.6
84.3
370
20.0
S


Example 214
VI-2
29.0
8620
91.6
6.4
31.3
22.9
3.18
4.9
90.7
180
21.7
S


Example 215
IV-1
28.3
8620
86.9
5.1
29.7
21.2
4.18
5.8
85.2
760
21.0
S


Example 216
VI-2
29.4
9460
28.4
7.0
32.0
7.9
0.78
4.6
89.4
1320
26.9
C


Example 217
IV-2
39.1
9280
32.5
4.7
42.2
11.8
1.39
9.0
77.8
1690
26.4
C


Example 218
V-1
27.0
9370
87.4
5.5
28.6
22.1
0.94
5.2
57.4
2230
27.1
C


Example 219
IV-1
76.8
9460
32.5
19.7
80.6
23.6
0.98
4.1
46.6
1960
27.0
C


Example 220
IV-2
51.5
9010
49.8
7.8
56.1
23.1
1.98
7.2
73.9
1140
27.3
C


Example 221
V-2
14.4
8700
186.0
8.7
15.7
23.3
2.98
1.8
65.8
1960
27.3
C


Example 222
VI-2
12.1
9050
137.9
4.5
13.1
15.1
3.98
2.9
80.5
2120
27.1
C


Comparative
IV-2
53.2
8960
60.8
6.5
56.4
29.0
1.07
8.7
55.9
350
29.6
F


Example 61















Comparative
V-1
26.4
9370
111.6
13.3
28.0
27.6
1.24
2.1
63.5
260
not flowing
F


Example 62















Comparative
VI-2
89.5
8360
39.4
10.6
98.5
29.5
1.02
9.3
62.0
490
28.1
F


Example 63















Comparative
IV-2
85.7
8610
61.8
0.5
90.0
45.6
1.50
180.0
37.3
830
not flowing
F


Example 64















Comparative
IV-1
39.1
8910
139.5
0.5
41.4
48.6
1.34
82.8
56.6
300
28.9
F


Example 65















Comparative
IV-1
63.1
8700
45.2
0.5
66.3
24.8
1.39
132.6
88.6
650
29.4
F


Example 66










[Composition VII-1, VII-2, VIII-1, VIII-2, IX-1, and IX-2]


The powders of Examples 223 to 252 and Comparative Examples 67 to 72 were measured for flow rate, and rated in accordance with the following criteria:


S: less than 18.0 s/50 g


A: 18.0 s/50 g or more, less than 20.0 s/50 g


B: 20.0 s/50 g or more, less than 22.0 s/50 g


C: 22.0 s/50 g or more, less than 24.0 s/50 g


F: 24.0 s/50 g or more (or not flowing)


These results are shown in the following Table 14.









TABLE 14







Evaluation Results
























Specific















Surface






Oxygen






D50
ρ
Area
D10
D60


D60/
P2
Concentration
Fluidity
Overall



Composition
(μm)
(kg/m3)
(m2/kg)
(μm)
(μm)
Value Y
D50/Dm
D10
(%)
(ppm)
(s/50 g)
Evaluation























Example 223
VII-2
69.3
10090
18.7
16.6
76.2
13.1
0.61
4.6
44.9
770
20.0
B


Example 224
VII-1
90.5
9720
24.7
18.3
95.0
21.7
0.79
5.2
46.0
440
20.8
B


Example 225
VIII-2
31.8
9040
37.2
4.2
34.3
10.7
0.65
8.2
47.6
280
21.7
B


Example 226
VIII-2
83.4
10290
13.4
11.2
88.4
11.5
1.32
7.9
36.1
290
20.9
B


Example 227
IX-2
44.1
8950
20.8
6.0
48.1
8.2
1.49
8.0
43.9
820
21.3
B


Example 228
IX-1
74.6
10120
25.4
9.0
78.3
19.2
1.43
8.7
38.2
590
20.4
B


Example 229
VII-2
76.2
8680
25.7
11.9
82.3
17.0
2.43
6.9
40.9
410
21.2
B


Example 230
IX-1
66.5
10090
14.0
12.5
72.5
9.4
3.43
5.8
41.4
760
20.7
B


Example 231
IX-2
53.9
9620
34.5
14.4
57.7
17.9
4.43
4.0
37.6
500
20.1
B


Example 232
VIII-2
72.2
9920
28.5
8.5
79.4
20.4
1.11
9.3
54.1
120
18.5
A


Example 233
VII-1
17.6
8860
93.0
2.7
19.4
14.5
1.05
7.2
53.8
290
19.9
A


Example 234
VII-2
35.9
9790
42.7
19.8
39.5
15.0
0.84
2.0
54.4
850
18.2
A


Example 235
IX-2
86.9
10020
26.5
11.3
93.9
23.1
0.89
8.3
55.1
870
18.1
A


Example 236
IX-2
89.4
10190
23.5
23.5
93.9
21.4
1.89
4.0
60.6
350
19.2
A


Example 237
VII-2
49.2
10090
26.8
16.2
53.6
13.3
2.89
3.3
66.0
340
19.5
A


Example 238
VIII-2
15.8
9620
94.1
8.3
17.4
14.3
3.89
2.1
72.1
780
18.0
A


Example 239
IX-1
62.1
8770
33.1
19.8
65.2
18.0
1.37
3.3
87.9
620
16.8
S


Example 240
IX-1
47.8
10220
44.0
18.1
52.6
21.5
1.00
2.9
82.1
120
16.8
S


Example 241
IX-1
14.6
8950
63.5
5.0
15.9
8.3
0.84
3.2
86.0
870
16.3
S


Example 242
VII-1
80.9
10020
14.9
20.8
87.4
12.1
1.18
4.2
85.5
360
17.0
S


Example 243
IX-2
47.6
10090
19.8
5.3
50.0
9.5
2.18
9.5
90.8
340
17.2
S


Example 244
VII-1
12.0
8950
154.6
1.7
13.2
16.6
3.18
7.9
84.0
210
17.4
S


Example 245
VII-2
41.4
9120
22.2
7.4
44.3
8.4
4.18
6.0
84.5
300
16.0
S


Example 246
IX-1
81.6
9920
12.8
11.6
87.3
10.4
0.78
7.5
79.0
1150
23.4
C


Example 247
IX-2
62.9
10020
12.4
9.6
66.0
7.8
1.39
6.9
46.1
1620
23.7
C


Example 248
VII-1
11.8
9120
202.6
1.4
12.9
21.8
0.94
9.5
57.6
2460
22.7
C


Example 249
IX-1
33.2
9820
31.6
12.5
34.9
10.3
0.98
2.8
80.4
1520
22.4
C


Example 250
VIII-1
84.2
9690
15.0
18.5
92.6
12.2
1.98
5.0
36.7
2300
22.3
C


Example 251
IX-1
64.5
10190
33.0
11.3
69.0
21.7
2.98
6.1
88.2
1550
23.4
C


Example 252
VIII-1
84.1
9620
17.4
20.7
89.1
14.1
3.98
4.3
74.3
2090
22.8
C


Comparative
IX-2
42.0
9690
121.1
22.1
44.1
49.3
1.07
2.0
88.8
390
24.7
F


Example 67















Comparative
IX-2
34.1
9890
80.9
5.1
36.8
27.3
1.24
7.2
82.2
520
not flowing
F


Example 68















Comparative
VII-1
52.0
10120
93.1
11.2
56.2
49.0
1.02
5.0
87.9
800
26.9
F


Example 69















Comparative
VII-1
59.9
10290
80.3
0.5
65.9
49.5
1.50
131.8
57.3
820
not flowing
F


Example 70















Comparative
IX-2
25.2
8770
183.3
0.5
26.5
40.5
1.34
53.0
36.0
250
27.6
F


Example 71















Comparative
VIII-1
66.7
10290
67.3
0.5
70.7
46.2
1.39
141.4
72.6
610
26.5
F


Example 72









As shown in Tables 12 to 14, the overall evaluation of the powder of each Example was excellent. Form these results, the superiority of the present invention is obvious.


INDUSTRIAL APPLICABILITY

The powder according to the present invention is suitable for the types of 3D printers in which powder is spouted from a nozzle. The powder is suitable for the types of laser coating processes in which powder is spouted from a nozzle.

Claims
  • 1. A metal powder composed of many spherical particles, the metal powder comprising at least one of Ni, Fe, and Co, wherein the total content (T.C.) of the Ni, the Fe, and the Co is 50 mass % or more,wherein the metal powder has a cumulative 10 vol % particle size D10 of 1.0 μm or more,wherein a ratio P2 of the number of particles having a circularity of 0.95 or more to the total number of the particles is 50% or more, andwherein a value Y is 7.5 to 24.0 as calculated by the following mathematical equation: Y=D50 (m)×ρ (kg/m3)×S (m2/kg)wherein D50 (m) represents a cumulative 50 vol % particle size of the powder, ρ (kg/m3) represents a true density of the powder, and S (m2/kg) represents a specific surface area of the powder.
  • 2. The powder according to claim 1, wherein the balance other than the three kinds that are Ni, Fe, and Co comprises: at least one of C, Si, Cr, Mo, Al, Ti, V, W, Nb, Zn, Ta, B, Ag, Cu, and Sn; and an unavoidable impurity.
  • 3. The powder according to claim 2, wherein a ratio of a cumulative 60 vol % particle size D60 to the particle size D10 (D60/D10) is 1.0 or more and less than 10.0.
  • 4. The powder according to claim 3, wherein a ratio of the particle size D50 to a mode diameter Dm (D50/Dm) is 0.80 to 1.20.
  • 5. The powder according to claim 4, wherein the ratio P2 is 80% or more.
  • 6. The powder according to claim 3, wherein the ratio P2 is 80% or more.
  • 7. The powder according to claim 2, wherein a ratio of the particle size D50 to a mode diameter Dm (D50/Dm) is 0.80 to 1.20.
  • 8. The powder according to claim 7, wherein the ratio P2 is 80% or more.
  • 9. The powder according to claim 2, wherein the ratio P2 is 80% or more.
  • 10. The powder according to claim 1, wherein a ratio of a cumulative 60 vol % particle size D60 to the particle size D10 (D60/D10) is 1.0 or more and less than 10.0.
  • 11. The powder according to claim 10, wherein a ratio of the particle size D50 to a mode diameter Dm (D50/Dm) is 0.80 to 1.20.
  • 12. The powder according to claim 11, wherein the ratio P2 is 80% or more.
  • 13. The powder according to claim 10, wherein the ratio P2 is 80% or more.
  • 14. The powder according to claim 1, wherein a ratio of the particle size D50 to a mode diameter Dm (D50/Dm) is 0.80 to 1.20.
  • 15. The powder according to claim 14, wherein the ratio P2 is 80% or more.
  • 16. The powder according to claim 1, wherein the ratio P2 is 80% or more.
  • 17. The powder according to claim 1, having an oxygen concentration of less than 1000 ppm.
  • 18. The powder according to claim 1, wherein a flow rate is less than 35.0 s/50 g.
  • 19. The powder according to claim 1, wherein a cumulative 60 vol % particle size D60 is 50.0 μm or more.
Priority Claims (2)
Number Date Country Kind
2015-071902 Mar 2015 JP national
2016-019607 Feb 2016 JP national
PCT Information
Filing Document Filing Date Country Kind
PCT/JP2016/059444 3/24/2016 WO 00
Publishing Document Publishing Date Country Kind
WO2016/158687 10/6/2016 WO A
Foreign Referenced Citations (8)
Number Date Country
6233090 Feb 1987 JP
5279701 Oct 1993 JP
2001152204 Jun 2001 JP
2001192703 Jul 2001 JP
2005281761 Oct 2005 JP
2006321711 Nov 2006 JP
201121218 Feb 2011 JP
WO-2015012055 Jan 2015 WO
Non-Patent Literature Citations (3)
Entry
Machine translation JP-5279701 (Year: 1993).
Machine translation JP2006-321711 (Year: 2006).
Machine translation WO 2015/012055 (Year: 2015).
Related Publications (1)
Number Date Country
20180104740 A1 Apr 2018 US