Abstract
Ultralow friction is achieved by ZrO2 as the friction mate material for DLC (Diamond like carbon) films under various environments. Coefficient of friction (CoF) of ZrO2/DLC films is as ultra low as 0.02 in ambient air at the temperature of 200 °C, and 0.03, 0.04 and 0.05 in hydrogen, nitrogen and vacuum environments at the temperature of 100 °C, respectively. It is concluded that the transferred films are formed on the worn surface of ZrO2 ball and amorphous carbon films. Ultralow friction of the friction pair is related with hydrogen, which is derived from DLC films, hydrogen environment or the liberation hydrogen due to hydrothermal oxidation. The ultralow friction mechanism is attributed to the formation of hydrogenated amorphous carbon films on ZrO2 ball and the shielding action of hydrogen from DLC films and the transferred films simultaneously.
Highlights
Diamond like carbon (DLC) films exhibit high hardness, chemical inertness and wear-resistance and low coefficient of friction (CoF), which make them ideal choices for engineering applications that involve sliding or rolling contacts between moving mechanical part surfaces [1,2,3,4]
Low CoF (0.06) was observed in N2, whereas high CoF was observed in vacuum, and it is shown that the tribological properties of DLC films are dependent on the transferred layer and tribochemical reactions
Yang et al [6] have found that CoF of DLC films decreases from the vacuum environment to the ambient air
Summary
Diamond like carbon (DLC) films exhibit high hardness, chemical inertness and wear-resistance and low coefficient of friction (CoF), which make them ideal choices for engineering applications that involve sliding or rolling contacts between moving mechanical part surfaces [1,2,3,4]. CoF of DLC films decreases from 0.12 to 0.035 as the speed increases in vacuum These published papers have showed that DLC films may exhibit excellent tribological performances under different environments. Zirconium oxide (ZrO2 ) has recently become the preferred ceramic material for high speed roller bearing balls, seal rings, cutters, dental application, drawing tools and valves due to the superior hardness and low density [9]. It is to be expected by combining the advantages of ZrO2 and DLC films that the excellent tribological properties of ZrO2 balls against DLC films friction pair are beneficial to improve the roller bearing. The present work will provide the fundamental theory of the ceramic material as high speed ball bearing material and DLC films as solid lubrication materials for engineering application in high speed ball bearings
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