Nm. Everitt et al., FRICTION MEASUREMENTS ON HOT-FILAMENT CVD DIAMOND FILMS DEPOSITED ON ETCHED TUNGSTEN CARBIDE SURFACES, DIAMOND AND RELATED MATERIALS, 4(5-6), 1995, pp. 730-734
Diamond-coated cemented carbides are a promising candidate for cutting
tools, but a critical problem is the poor adhesion strength between t
he coating and the substrate. We have grown diamond films on WC-6%Co a
nd WC-10%Co using hot filament CVD. Acid etching was necessary to remo
ve Co from the substrate surfaces, and Co was more easily removed from
the 10% Co sample. Scratch testing with a diamond stylus gave frictio
n coefficients of 0.4-0.6. The standard deviation in the coefficient o
f friction during a pass was used as a measure of the adhesion quality
when comparing films of similar morphology.