Process for producing fine spherical particles

Details Process for producing fine spherical particles Process for producing fine spherical particles

1988-06-20

1989-03-28

Stallard, Wayland

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 75 05BB, 75 05BC, 75 05C, 65213, 264 15, B22F 904

Patent

active

048160679

ABSTRACT:
A process is disclosed for producing fine spherical particles from a fine powder feed material which comprises entraining the powder feed material in a carrier gas, introducing the feed material and carrier gas through a powder port into a high temperature zone and maintaining the powder feed material 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 droplets therefrom while at the same time allowing one or more streams of gas to come into contact intermittently with any powder which has accumulated in the vicinity of the powder port to keep the vicinity clear of powder to allow the powder feed to pass unobstructively through the powder port into the high temperature zone. The droplets are then cooled to form spherical particles.

REFERENCES:
patent: 3272615 (1966-09-01), Hoffman et al.
patent: 3652259 (1972-03-01), Knopp
patent: 4592781 (1986-06-01), Cheney et al.
patent: 4711660 (1987-12-01), Kemp, Jr.
patent: 4715878 (1987-12-01), Kopatz et al.

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