	US 12,187,976 B2
	Mixed powder for powder metallurgy
Hanako Shimamoto, Tokyo (JP); Ryosuke Matsuoka, Tokyo (JP); Kohsuke Ashizuka, Tokyo (JP); and Shigeru Unami, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/594,561
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 28, 2020, PCT No. PCT/JP2020/003003 § 371(c)(1), (2) Date Oct. 22, 2021, PCT Pub. No. WO2020/217618, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-082258 (JP), filed on Apr. 23, 2019; and application No. PCT/JP2019/028551 (WO), filed on Jul. 19, 2019.
Prior Publication US 2023/0158565 A1, May 25, 2023
Int. Cl. B22F 1/10 (2022.01); B22F 1/00 (2022.01); B22F 1/08 (2022.01); B22F 1/102 (2022.01); B22F 1/105 (2022.01); B22F 1/16 (2022.01); B22F 1/17 (2022.01); C10M 115/04 (2006.01); C10M 115/08 (2006.01); C10M 169/04 (2006.01); C10N 40/20 (2006.01)

CPC C10M 169/04 (2013.01) [B22F 1/00 (2013.01); B22F 1/08 (2022.01); B22F 1/09 (2022.01); B22F 1/10 (2022.01); B22F 1/102 (2022.01); B22F 1/105 (2022.01); B22F 1/16 (2022.01); B22F 1/17 (2022.01); C10M 115/04 (2013.01); C10M 115/08 (2013.01); B22F 2301/10 (2013.01); B22F 2301/35 (2013.01); C10M 2207/1265 (2013.01); C10M 2207/2815 (2013.01); C10M 2207/2835 (2013.01); C10M 2207/2895 (2013.01); C10M 2215/265 (2013.01); C10M 2215/285 (2013.01); C10N 2040/246 (2020.05)]

14 Claims

1. A mixed powder for powder metallurgy, comprising:

an (a) iron-based powder; and

a (b) lubricant,

wherein the (b) lubricant contains a fatty acid metal soap,

the (b) lubricant consists of a low-melting-point lubricant having a melting point of 86° C. or less and a high-melting-point lubricant having a melting point of more than 86° C.,

the low-melting-point lubricant is at least one of a fatty acid monoamide having a melting point of 80° C. or more and a fatty acid having a melting point of 75° C. or more,

the low-melting-point lubricant has at least one selected from the group consisting of an amide group, an ester group, an amino group, and a carboxyl group,

a ratio R1 of the low-melting-point lubricant to whole of the (b) lubricant is 5 mass % or more and less than 90 mass %,

a ratio R2 of a mass of a (b2) free lubricant to a mass of a (b1) binding lubricant is 0 or more and 15 or less, where the (b1) binding lubricant is the (b) lubricant adhering to a surface of the (a) iron-based powder, and the (b2) free lubricant is the (b) lubricant not adhering to the surface of the (a) iron-based powder, and

an amount R3 of the low-melting-point lubricant contained as the (b2) free lubricant is less than 0.10 parts by mass with respect to 100 parts by mass of the iron-based powder.