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Process for producing iron group based and chromium based fine spherical particles

  • US 4,778,515 A
  • Filed: 09/08/1986
  • Issued: 10/18/1988
  • Est. Priority Date: 09/08/1986
  • Status: Expired due to Fees
First Claim
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1. A process comprising:

  • (a) mechanically reducing the size of a material selected from the group consisting of iron group based and chromium based materials to produce a finer powder, the major portion of which has a particle size of less than about 20 micrometers;

    (b) entraining said finer powder in a carrier gas and passing said powder through a high temperature zone at a temperature above the melting point of said finer powder, said temperature being from about 5500°

    C. to about 17,000°

    C., said temperature being created by a plasma jet, to melt at least about 50% by weight of said finer powder to form essentially fine spherical particles of said melted portion; and

    (c) rapidly and directly resolidifying the resulting high temperature treated material, while said material is in flight, to form fine spherical particles having a particle size of less than about 20 micrometers in diameter, said particles being essentially free of elliptical shaped material and essentially free of elongated particles having rounded ends.

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