Abstract
Abstract Five kinds of interlayers are prepared on the surface of 6 wt% Co tungsten carbide cement substrate, then approximately 1 μm thick diamond coating is deposited onto these specimens by means of hot filament chemical deposition (HFCVD). The quality of the interlayer, as-nucleated, and as-grown diamond coatings are characterized using X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and Rockwell hardness test. It is found that the aluminum chromium nitride (AlCrN) interlayer is much more thermally stable and less reactive with the adsorbed carbon atoms than other interlayers, namely Cr, WC, Cr + WC, and Ti + WC. This determines the efficiency of depressing Co out by diffusion to the top surface to become strengthened according to the following order: Ti + WC
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