Abstract
This study used an un-balanced magnetron sputtering system to deposit different thickness of diamond-like carbon (DLC) film on Co–Cr–Mo and Ti–6A1–4V alloy substrate. Wear test, Raman spectroscopy analysis, nano-indentation test and morphology of contact surface were conducted to evaluate the tribological performance of these films for bio-medical applications. The ring-on-disk wear testing shows that the thicker film leads to the lower friction coefficient and higher wear resistance. In the testing process, the fluctuating friction coefficient of DLC coated Co–Cr–Mo substrate was less than that of DLC coated Ti–6Al–4V substrate. Raman spectroscopy analysis and nano-indentation test provide the underlying mechanism for the enhancement of the wear resistance. The DLC coated Co–Cr–Mo substrate provides better wear resistance than the DLC coated Ti–6Al–4V substrate owing to better adhesion of DLC film to the Co–Cr–Mo substrate.
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