Balls containing tungsten carbide

Details Balls containing tungsten carbide Balls containing tungsten carbide

1978-09-21

1980-01-08

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BC, 75204, 75252, 401215, B22F 500, B22F 706

Patent

active

041826272

ABSTRACT:
A process for producing balls of cobalt containing tungsten carbide, the process comprising forming droplets of a liquid mixture comprising: particles of tungsten carbide; guar gum; a dissolved cobalt salt; and a non-ionic wetting agent; contacting the droplets for not more than 1 hour with a base to precipitate a cobalt species, thereby forming droplets of a gel precipitate, placing the droplets of the gel precipitate in a vessel having a thermal conductivity not exceeding 100 cal/sec/cm.sup.2, and heating the vessel in a reducing atmosphere to remove the guar gum and to sinter the tungsten carbide and cobalt, thereby forming sintered balls of cobalt containing tungsten carbide.

REFERENCES:
patent: 3617358 (1971-11-01), Dittrich
patent: 3628921 (1971-12-01), Hill
patent: 3746456 (1973-07-01), Hill
patent: 4025334 (1977-05-01), Cheney et al.

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