Method of making a diamond-coated composite body

Details Method of making a diamond-coated composite body Method of making a diamond-coated composite body

1996-04-17

1997-06-03

King, Roy V.

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427540, 427577, 427249, 51309, 51295, B05D 306

Patent

active

056352565

ABSTRACT:
At least the surface region of a cutting tool substrate made of tungsten carbide in a cobalt matrix is carburized to chemically passivate the cobalt prior to deposition of diamond film on it. The passivation improves adhesion by preventing reaction of the cobalt with the diamond in the course of the deposition process. To further improve adhesion of the diamond, cobalt is removed from the exposed surfaces of the tungsten carbide grains by heat treatment in inert gas or by hydrogen plasma.

REFERENCES:
patent: 5204167 (1993-04-01), Saijo et al.
patent: 5236740 (1993-08-01), Peters et al.
patent: 5342660 (1994-08-01), Cann et al.
Haubner et al, Diamond and Related Materials, 2(1993) pp. 1505-1515.
Park et al, Diamond and Related Materials, 2(1993) pp.910-917.

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