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US 11,685,979 B2Granted
Iron based powder
AssigneeHöGanäS AB (Publ)
InventorsCaroline Larsson, Ulf Engström, Christophe Szabo
Life of this patent
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Abstract
Disclosed is a new diffusion-bonded powder consisting of an iron powder having 1-5%, preferably 1.5-4% and most preferably 1.5-3.5% by weight of copper particles diffusion bonded to the surfaces of the iron powder particles. The new diffusion bonded powder is suitable for producing components having high sintered density and minimum variation in copper content.
Claims10
A process for producing an iron-based powder comprising the following steps:
- providing an iron powder having a content of oxygen of 0.3-1.2% by weight, a content of carbon of 0.1-0.5% by weight, a maximum particle size of at most 250 μm and at most 30% by weight below 45 μm and providing a copper containing powder having a maximum particle size, X90, of at most 22 μm and a weight average particle size, X50, of at most 15 μm,
- mixing said iron powder and said copper containing powder,
- subjecting said mixture to a reduction annealing process in a reducing atmosphere at 800-980° C. for a period of 20 minutes to 2 hours to obtain a cake, and
- crushing the obtained cake and separating a resulting powder by desired particle size to form the iron-based powder.
1 more element
Dependencies are inferred from the claim text.