The tribological properties of chemical-vapor-deposited diamond films vary with the environment, possessing a Jekyll-and-hyde Character. CVD diamond has low coefficient of friction and high wear rssistnace in air but high coefficient of firction and low wear resistance in vacuum. Improving the tribological functionality fo materials was an aim of this ivnestigation. Three studies on the surface design, surface engineering, and tribology of CVD diamond have shown that its friction and wear are significantly rduced in ultrahigh vacuum. The main criteria for judging whether diamond films are an effective wear-resistant, self-lubricating matrial were coefficient of friction and wear rate, which must be less than 0.1 and on the order of 10 sup -1mm sub 3/N.m, resectively.
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