CVD diamond coated cutting tools and method of manufacture

Details CVD diamond coated cutting tools and method of manufacture CVD diamond coated cutting tools and method of manufacture

1994-02-14

1997-04-08

Turner, Archene

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

407119, 51295, 51307, 51309, 428216, 428457, 428469, 428698, C23C 1626, B22F 314

Patent

active

056186258

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: 4610931 (1986-09-01), Nemeth et al.
patent: 4731296 (1988-03-01), Kikuchi et al.
patent: 4743515 (1988-05-01), Fischer et al.
patent: 4900628 (1990-02-01), Ikegaya et al.
Ceramic-Matrix Composites, 1992, R. Warren, pp. 46-53.

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