Ultra-High Tribological Performance of Magnetron Sputtered a-C:H Films in Sand-Dust Environment |
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Authors: | Jianwei Qi Liping Wang Fengyuan Yan Qunji Xue |
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Affiliation: | (1) State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China; |
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Abstract: | The hydrogenated amorphous carbon (a-C:H) films were prepared on AISI 440C steel substrates using a RF magnetron sputtering
graphite target in the CH4 and Ar mixture atmosphere. The friction and wear behavior of a-C:H films were comparatively investigated by pin-on-disc tester
under dry sliding and simulated sand-dust wear conditions. In addition, the effects of applied load, amount of sand and sand
particle sizes on the tribological performance of a-C:H films were systemically studied. Results show that a-C:H films exhibited
ultra-high tribological performance with low friction coefficient and ultra-low wear rate under sand-dust environments. It
is very interesting to observe that the friction coefficient of a-C:H film under sand-dust conditions was relatively lower
when compared with dry sliding condition, and the wear rate under sand-dust conditions kept at the same order of magnitude
(×10−19 m3/N m) with the increase of applied load and particle size as a comparison with the dry sliding condition. Based on the formation
of “ridge” layer (composite transfer layer), a transfer layer-hardening composite model was established to explain the anti-wear
mechanisms and friction-reducing capacity of a-C:H solid lubrication films under sand-dust conditions. |
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