Process for producing fine spherical particles having a low oxyg

Details Process for producing fine spherical particles having a low oxyg Process for producing fine spherical particles having a low oxyg

1988-05-23

1989-02-28

Stallard, Wayland

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 75 05BB, 264 15, B22F 908

Patent

active

048082171

ABSTRACT:
A process is disclosed for producing fine spherical particles from a starting fine powder material which comprises entraining the powder material in a carrier gas, passing the powder material and the carrier gas through a high temperature zone, and maintaining the powder in the high temperature zone for a sufficient time to melt at least about 50% by weight of the particles of the powder and to form spherical particles of the melted portion, allowing the high temperature treated material to come in contact with a reducing atmosphere created by a stream of hydrogen gas, and thereafter rapidly solidifying the resulting high temperature treated material to form spherical particles wherein the oxygen content of the spherical particles is reduced by greater than about 10% by weight from the starting powder.

REFERENCES:
patent: 3909241 (1975-08-01), Cheney et al.
patent: 3974245 (1976-08-01), Cheney et al.
patent: 4502885 (1985-03-01), Cheney
patent: 4592781 (1986-06-01), Cheney et al.
patent: 4711660 (1987-12-01), Kemp et al.
patent: 4711661 (1987-12-01), Pemp et al.
patent: 4743297 (1988-05-01), Kopatz et al.

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