Ultralow Friction Behaviors of Hydrogenated Fullerene-Like Carbon Films: Effect of Normal Load and Surface Tribochemistry |
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Authors: | Z Wang C B Wang B Zhang J Y Zhang |
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Affiliation: | (1) State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) National Engineering Research Center for Technology and Equipment of Green Coating, Lanzhou Jiaotong University, Lanzhou, 730070, China; |
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Abstract: | Friction and wear behaviors of hydrogenated fullerene-like (H-FLC) carbon films sliding against Si3N4 ceramic balls were performed at different contact loads from 1 to 20 N on a reciprocating sliding tribometer in air. It was
found that the films exhibited non-Amontonian friction behaviors, the coefficient of friction (COF) decreased with normal
contact load increasing: the COF was ~0.112 at 1 N contact load, and deceased to ultralow value (~0.009) at 20 N load. The
main mechanism responsible for low friction and wear under varying contact pressure is governed by hydrogenated carbon transfer
film that formed and resided at the sliding interfaces. In addition, the unique fullerene-like structures induce well elastic
property of the H-FLC films (elastic recovery 78%), which benefits the high load tolerance and induces the low wear rate in
air condition. For the film with an ultralow COF of 0.009 tested under 20 N load in air, time of flight secondary ion mass
spectrometry (ToF-SIMS) signals collected inside and outside the wear tracks indicated the presence of C2H3
− and C2H5
− fragments after tribological tests on the H-FLC films surface. We think that the tribochemistry and elastic property of the
H-FLC films is responsible for the observed friction behaviors, the high load tolerance, and chemical inertness of hydrogenated
carbon-containing transfer films instead of the graphitization of transfer films is responsible for the steady-state low coefficients
of friction, wear, and interfacial shear stress. |
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