Process for coating tungsten carbide with cobalt metal

Details Process for coating tungsten carbide with cobalt metal Process for coating tungsten carbide with cobalt metal

1987-08-24

1989-01-31

Bell, Janyce

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427350, 427352, 427377, B05D 700

Patent

active

048014729

ABSTRACT:
A process is disclosed for coating tungsten carbide with cobalt metal. The process involves forming an aqueous slurry of tungsten carbide having a particle size of no greater than about -100 mesh, and zinc powder, adding ammonia to the slurry in an amount sufficient so that the slurry is basic after the addition of cobalt chloride, adding a solution of cobalt chloride to the ammoniated slurry with the amount of cobalt chloride being sufficient to provide a coating of partially reduced cobalt on the tungsten carbide, removing this cobalt coated tungsten carbide from the resulting liquor, and heating the coated tungsten carbide in a reducing atmosphere to effect the essentially complete reduction of the cobalt and to produce a cobalt metal coating on the tungsten carbide.

REFERENCES:
patent: 2119487 (1938-05-01), Padowicz
patent: 4242376 (1980-12-01), Kawasumi et al.
patent: 4309457 (1982-01-01), Kawasumi et al.

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