Abstract
The relationship between the tribological behavior and inherent features of the DLC coatings (i.e. structural and mechanical properties) as a consequence of deposition conditions was investigated. Hence, a plasma nitrocarburising process as pretreatment followed by Diamond-Like Carbon (DLC) deposition by pulsed DC Plasma Assisted Chemical Vapor Deposition (PACVD) method, was utilized. Although a remarkable reduction in the friction coefficient of coated samples was observed, almost the same friction coefficient was measured for the DLC coatings (i.e. 0.2), regardless of their diverse intrinsic properties. As the H/C ratio in feeding gas and temperature increased up to certain values, the hardness and elastic modulus increased while the wear rate decreased. Therefore, the DLC coating deposited with the highest Hydrogen fraction at 160°C, exhibited the highest hardness and elastic modulus (i.e. 25.4GPa and 177.4GPa, respectively), as well as the lowest wear rate of 5.9×10−06mm3/N·m.
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