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Hydrometallurical process for producing finely divided spherical refractory metal based powders

  • US 4,731,111 A
  • Filed: 03/16/1987
  • Issued: 03/15/1988
  • Est. Priority Date: 03/16/1987
  • Status: Expired due to Fees
First Claim
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1. A process comprising:

  • (a) forming an aqueous solution containing at least one refractory metal,(b) forming a solid reducible material having a major portion selected from the group consisting of reducible refractory metal salts, oxides and mixtures thereof,(c) reducing said solid reducible material to form refractory metal based powder particles,(d) entraining at least a portion of said refractory metal particles in a carrier gas,(e) feeding said entrained particles and said carrier gas into a high temperature zone and maintaining said particles in said zone for a sufficient time to melt at least about 50% by weight of said particles, and to form droplets therefrom and(f) cooling said droplets to form refractory metal based metallic particles having essentially a spherical shape and a majority of said particle having a size less than 20 micrometers.

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