Sputtered Si-containing low-friction carbon coatings for elevated temperatures |
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Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People’ Republic of China;2. University of Chinese Academy of Sciences, Beijing 100039, People’ Republic of China;1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Joining Technologies and Corrosion, Switzerland;2. EPFL, École Polytechnique Fédérale de Lausanne, Tribology and Interfacial Chemistry Group, Switzerland |
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Abstract: | This work presents a tribological study on three sputtered amorphous carbon-based coatings containing Si and Cr (a-C, a-C:Cr and a-C:Si). Molecular dynamics simulations predict tetrahedral bonds between C and Si in the a-C matrix. Ball-on-disk-tests against Al2O3 carried out at room temperature revealed a coefficient of friction of 0.08–0.1 for all films. Between 250 and 325 °C, Si decreases the COF and wear rate to and , respectively. The a-C reference shows a COF of 0.15±0.05 and a wear rate of , whereas the a-C:Cr film failed. The improved tribological performance of a-C:Si expands its application temperature to 450 °C and is most probably related to formation of Si-compounds on the film surface, as evidenced by X-ray photoelectron spectroscopy. |
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Keywords: | Amorphous carbon Elevated temperatures Thermal stability Temperature induced lubrication |
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