Composite diamond grain and method for production thereof

Details Composite diamond grain and method for production thereof Composite diamond grain and method for production thereof

1991-05-13

1993-12-07

Lesmes, George F.

Coating processes

Coating by vapor, gas, or smoke

Base includes an inorganic compound containing silicon or...

427215, 427577, 427590, 423446, 423458, C01B 3106, C30B 2500, C23C 1622

Patent

active

052682013

ABSTRACT:
A composite diamond grain which comprises a heat-resistant grain as a nucleus and discrete diamond crystal particles distributed on the surface of the grain or diamond crystal films formed to cover the entire surface of the grain and a method for producing the composite diamond grain by the vapor-phase process are disclosed. For the filament method which is one form of the vapor-phase method, tantalum is useful as the material for the filament. Since tantalum is susceptible of embrittlement by hydrogen, a treatment to be performed on tantalum for the elimination of this drawback is also disclosed.

REFERENCES:
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patent: 4707384 (1987-11-01), Schachner et al.
patent: 4740263 (1988-04-01), Imai et al.
patent: 4816286 (1989-03-01), Hirose
patent: 4849199 (1989-07-01), Pinneo
patent: 4859493 (1989-08-01), Lemelson
patent: 4915977 (1990-04-01), Okamoto et al.
patent: 4925701 (1990-05-01), Jansen et al.
patent: 4938940 (1990-07-01), Hirose et al.

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