B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
18/507
B22F 9/04 (2006.01) B22F 1/00 (2006.01) C03B 19/10 (2006.01) C09C 3/04 (2006.01) A61B 19/00 (2006.01)
Patent
CA 1328549
ABSTRACT A powder material and a process for producing the material are disclosed The powder material consists essentially of spherical particles selected from the group consisting of metals, metal alloys, ceramic glasses, crystalline ceramic materials, and combinations thereof The material is essentially free of elliptical shaped material and elongated particles having rounded ends The material has a particle size of less than about 20 micrometers in diameter and has an oxygen content of less than about 0.8% by weight. The process for making the spherical particles involves reducing the size of a starting material to produce a finer powder essentially all of which has a particle size of less than about 20 micrometers in diameter. This is done by fluid energy milling. The finer powder is entrained in a carrier gas and passed through a high temperature zone at a temperature above the melting point of the powder, the temperature being from about 5500°C to about 17,000°C and created by a plasma jet, to melt at least about 50% by weight of the powder and form spherical particles of the melted portion. The powder is then rapidly and directly solidified while in flight. The carbon content of the particles is no greater than that of the starting material. 16
591945
Johnson Walter A.
Kemp Preston B. Jr.
Gte Products Corporation
R. William Wray & Associates
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