Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1988-05-23
1989-03-28
Stallard, Wayland
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
241 23, C22C 104, B02C 1912
Patent
active
048160695
ABSTRACT:
A method for converting cobalt to cobalt powder is disclosed which comprises heating a starting mixture of cobalt and zinc in a non-reacting atomosphere at a first temperature of below the boiling point of zinc up to about 900.degree. C. in a non-reacting atmosphere for a length of time sufficient to cause the alloying of a portion of the zinc and cobalt, with the weight ratio of zinc to cobalt being less than about 10. The temperature of the resulting partially alloyed mixture is slowly raised to a second temperature of from about 900.degree. C. to about 960.degree. and is maintained for a time sufficient only to form a reaction product in which essentially all of the cobalt is alloyed with zinc and to keep the evaporation of zinc to a minimum. The reaction product is then heated at a pressure below atmospheric pressure at a third temperature of no greater than about 950.degree. C. for a time sufficient to evaporate essentially all of the zinc and produce a cobalt ingot which is pulverizable when cooled to room temperature.
REFERENCES:
patent: 3595484 (1971-07-01), Barnard et al.
patent: 4401462 (1983-08-01), Watanabe et al.
patent: 4469505 (1984-09-01), Cheresnowsky et al.
patent: 4655825 (1987-04-01), Hard et al.
Douglas Alan D.
MacInnis Martin B.
Vanderpool Clarence D.
Castle Donald R.
GTE Products Corporation
Quatrini L. Rita
Stallard Wayland
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