US 12,168,818 B2
Iron based powder
Caroline Larsson, Nyhamnsläge (SE); Ulf Engström, Höganäs (SE); and Christophe Szabo, Ratingen (DE)
Assigned to HÖGANÄS AB (PUBL), Höganäs (SE)
Filed by HÖGANÄS AB (PUBL), Höganäs (SE)
Filed on Apr. 14, 2023, as Appl. No. 18/301,024.
Application 18/301,024 is a continuation of application No. 16/087,377, granted, now 11,685,979, previously published as PCT/EP2017/056123, filed on Mar. 15, 2017.
Claims priority of application No. 16161814 (EP), filed on Mar. 23, 2016.
Prior Publication US 2023/0250519 A1, Aug. 10, 2023
Int. Cl. C22C 33/02 (2006.01); B22F 1/05 (2022.01); B22F 1/052 (2022.01); B22F 1/06 (2022.01); B22F 1/10 (2022.01); B22F 1/17 (2022.01); B22F 3/16 (2006.01); B22F 3/24 (2006.01); B22F 9/04 (2006.01); C22C 38/16 (2006.01)
CPC C22C 33/0264 (2013.01) [B22F 1/05 (2022.01); B22F 1/052 (2022.01); B22F 1/06 (2022.01); B22F 1/10 (2022.01); B22F 1/17 (2022.01); B22F 3/16 (2013.01); B22F 3/24 (2013.01); B22F 9/04 (2013.01); C22C 33/0235 (2013.01); C22C 38/16 (2013.01); B22F 2003/248 (2013.01); B22F 2301/35 (2013.01); B22F 2302/25 (2013.01); Y10T 428/12014 (2015.01); Y10T 428/12611 (2015.01)] 6 Claims
OG exemplary drawing
 
1. An iron based powder consisting of particles of reduced copper oxide diffusion bonded to the surface of an atomized iron powder,
wherein the content of copper is 1-5% by weight of the iron based powder,
wherein the iron based powder is produced by providing an atomized iron powder with an oxygen content of 0.3-1.2% by weight and with a carbon content of 0.1-0.5% by weight, and subjecting the atomized iron powder and a copper containing powder to a reduction annealing process in a reducing atmosphere to obtain the iron based powder, and
wherein the iron based powder has a maximum particle size of 250 μm, at least 75% is below 150 μm and at most 30% is below 45 μm, wherein the iron based powder has an apparent density of at least 2.70 g/cm3 and an oxygen content of at most 0.16% by weight, and wherein other impurities are at most 1% by weight of the iron based powder.