	US 12,378,645 B2
	Iron-based mixed powder for powder metallurgy and iron-based sintered body
Takuya Takashita, Tokyo (JP); Nao Nasu, Tokyo (JP); and Akio Kobayashi, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/594,163
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Feb. 10, 2020, PCT No. PCT/JP2020/005169 § 371(c)(1), (2) Date Oct. 5, 2021, PCT Pub. No. WO2020/202805, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-072867 (JP), filed on Apr. 5, 2019.
Prior Publication US 2022/0161321 A1, May 26, 2022
Int. Cl. B22F 1/05 (2022.01); B22F 1/00 (2022.01); B22F 1/10 (2022.01); B22F 1/12 (2022.01); B22F 3/16 (2006.01); B22F 3/24 (2006.01); C22C 33/02 (2006.01); C22C 38/12 (2006.01)

CPC C22C 33/0207 (2013.01) [B22F 1/00 (2013.01); B22F 1/09 (2022.01); B22F 1/10 (2022.01); B22F 1/12 (2022.01); B22F 3/16 (2013.01); B22F 3/24 (2013.01); C22C 38/12 (2013.01); B22F 2003/248 (2013.01); B22F 2301/10 (2013.01); B22F 2301/35 (2013.01); B22F 2302/40 (2013.01)]

12 Claims

1. An iron-based mixed powder for powder metallurgy, comprising:

an iron-based alloy powder; and

an alloying powder,

wherein the iron-based alloy powder contains Mo: 0.2 mass % or more and 1.5 mass % or less,

the alloying powder contains a graphite powder and a copper powder,

a ratio of a mass of the graphite powder to a total mass of the iron-based alloy powder and the alloying powder is 0.10 mass % to 1.0 mass %,

a ratio of a mass of the copper powder to the total mass of the iron-based alloy powder and the alloying powder is 0.5 mass % to 3.0 mass %, and

the copper powder has an average particle size of 15 μm or more and 25 μm or less, and a specific surface area of 0.30 m²/g to 0.60 m²/g, the average particle size of the copper powder being defined as a median size of primary particles of the copper powder measured by a laser diffraction-scattering type particle size distribution measurement device.