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Hydrometallurgical process for producing finely divided spherical maraging steel powders containing readily oxidizable alloying elements

  • US 4,772,315 A
  • Filed: 01/04/1988
  • Issued: 09/20/1988
  • Est. Priority Date: 01/04/1988
  • Status: Expired due to Fees
First Claim
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1. A process comprising:

  • (a) forming an aqueous solution containing the metal values of iron, cobalt, nickel and molybdenum, said metals being present in a predetermined ratio,(b) forming from said solution a reducible solid material selected from the group consisting of salts of said metals, oxides of said metals, hydroxides of said metals and mixtures thereof,(c) reducing said material to form metallic powder particles,(d) agglomerating said particles with a predetermined amount of a second group consisting of at least one readily oxidizable metal selected from the group consisting of aluminum, titanium and vanadium and,(e) entraining at least a portion of said agglomerates in a carrier gas,(f) feeding said entrained agglomerates and said carrier gas into a high temperature zone and maintaining said agglomerates within said zone for a sufficient time to melt at least about 50% by weight of said agglomerates and to form droplets therefrom, and(g) cooling said droplets to form essentially spherical shaped particles of a maraging steel alloy containing at least one readily oxidizable metal.

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