Coating processes – Coating by vapor – gas – or smoke – Carbon or carbide coating
Patent
1995-06-06
1997-08-26
King, Roy V.
Coating processes
Coating by vapor, gas, or smoke
Carbon or carbide coating
427309, 427560, 51307, 407119, 419 49, C23C 1626, C22C 105, B22F 314, B23P 500
Patent
active
056608810
ABSTRACT:
This invention presents diamond coated tool member of high toughness exhibiting excellent diamond adhesion to the substrate. The green compacts of the usual Co and WC composition are subjected to primary sintering in a vacuum or in an inert gas atmosphere, followed by secondary sintering in a vacuum or in an inert gas atmosphere at a pressure in the range of 10-200 atmospheres at a temperature between the liquid formation temperature of Co and 1,500.degree. C. The as-sintered surfaces are subjected to chemical etching, followed by fine polishing in an ultrasonic bath held at room temperature or a temperature just below the boiling point. The cutting tool substrate having the polished surface is placed in a CVD reactor to deposit a diamond coating. The concentration profile of Co in the diamond coated tool member hus formed has a Co-deficient layer and a Co-gradient layer. The Co-deficient layer assures good adhesion of diamond coating to the cutting tool substrate and the regular Co concentration in the interior of the cutting tool substrate assures high toughness.
REFERENCES:
patent: 4731296 (1988-03-01), Kikuchi et al.
King Roy V.
Mitsubishi Materials Corporation
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