Ultralow friction is achieved by ZrO2 as the friction mate material for DLC (Diamond like\ncarbon) films under various environments. Coefficient of friction (CoF) of ZrO2/DLC films is as\nultra low as 0.02 in ambient air at the temperature of 200 ââ??¦C, and 0.03, 0.04 and 0.05 in hydrogen,\nnitrogen and vacuum environments at the temperature of 100 ââ??¦C, respectively. It is concluded that\nthe transferred films are formed on the worn surface of ZrO2 ball and amorphous carbon films.\nUltralow friction of the friction pair is related with hydrogen, which is derived from DLC films,\nhydrogen environment or the liberation hydrogen due to hydrothermal oxidation. The ultralow\nfriction mechanism is attributed to the formation of hydrogenated amorphous carbon films on ZrO2\nball and the shielding action of hydrogen from DLC films and the transferred films simultaneously.
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