Achieving Low Tribological Moisture Sensitivity by a-C:Si:Al Carbon-based Coating |
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Authors: | Shengguo Zhou Liping Wang 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 University of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China; |
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Abstract: | Owing to the requirements of the stable operation for mechanical components, the urgent challenges are to control tribological
moisture sensitivity of protective coatings. In this letter, a-C:Si and a-C:Si:Al carbon-based coatings were successfully
fabricated via magnetron sputtering Si, Al, and C. The microstructure, mechanical properties, and tribological moisture sensitivity
of as-fabricated carbon-based coatings were comparatively investigated. Results showed that the as-fabricated a-C:Si and a-C:Si:Al
coatings were dominated by typical amorphous structure. The co-introduction of Al could effectively relax internal stress
and improve adhesive strength as well as maintain the moderately high hardness for the as-fabricated coating. The striking
improvement in tribological moisture sensitivity of a-C:Si:Al carbon-based coating was mainly attributed to the superior mechanical
properties and the formation of continuously compacted graphitized tribofilm under low relative humidity condition as well
as low shear strength colloidal silica tribofilm under high relative humidity condition. The good balance between the hardness
and toughness, low internal stress, and superior low tribological moisture sensitivity of a-C:Si:Al coating make it a good
candidate for solid lubricating coating in engineering applications. |
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