Abstract
The electrostatic and tribological properties of three types of anodic aluminium oxide (alumite) and hydrogenated Diamond-Like Carbon (DLC) on alumites were investigated. It was first proven that an ultrathin DLC at 5 nm on an insulative surface exhibits slow discharge. For alumites, clear electrostatic discharge behaviour was not observed in spite of the fact that surface resistance was in the dissipative region of 1010 Ω. Upon coating alumites with a hydrogenated DLC, slow charge and discharge were observed. DLC coatings on alumites significantly improved dielectric strength and hardness due to DLC's intrusion into the porous structure of the alumites. The coefficient of friction on alumites, which stood at 0.9 against Al2O3 and E52100 balls, was much improved to 0.1 with a DLC coating, and so was wear loss and life time.
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