With the rapid development of aerospace, advanced nuclear energy and other fields, the service conditions of its mechanical moving parts have become ever more varied, complex, and demanding, and increasingly higher demands have been made on the surface-lubricated and protective film materials against radiation and many features. Requirements, resulting in the traditional transition metal disulfide film (TMD) and diamond-like carbon film (DLC) and other single-component lubricating film materials face severe challenges.
Lu Peng, the State Key Laboratory of Solid Lubrication, Institute of Chemical Physics, Chinese Academy of Sciences, Lubrication and Protective Materials Group under irradiation environment, Wang Peng and Xu Wei have been working on TMD/DLC binary composites and their multi-doped films in recent years. Recently, the research group successfully prepared Mo-SN binary composite films and Mo-SCN multiple composite films for the first time, and conducted in-depth research on their performance. The results show that the co-doping of non-metallic elements with C/N makes the surface of the sputtered film more compact and flat, and the characteristics of the columnar structure of the cross section are significantly weakened. The parameter-optimized C/N co-doping can effectively reduce the sensitivity of the N-doped MoS2 thin film to the humid atmosphere. It can significantly improve the mechanical strength and toughness of the thin film while maintaining the low friction and wear resistance of the thin film in vacuum and humid atmosphere. Loss of performance, and in the space and fusion radiation environment showed good radiation resistance, in order to achieve the composite film system low friction, anti-irradiation and adaptive integration of open up a new way.
The friction interface microdomain analysis revealed that the self-adaptivity of the TMD/DLC composite film system is significantly affected by the evolution of the non-lubricant phase that is selectively transferred out of the contact surface. In the tribochemical reaction, the directional orientation of the lubricating phase is determined by the degree of The minimum coefficient of friction of the film, the degree of selective transfer of the non-lubricated phase determines the minimum wear rate of the film. At the same time, there is also a clear correlation between the micro structure of the self-adaptive composite thin film and the selective transfer behavior. The MoS2 enriched layer with a (002) crystal orientation is very favorable to the rapid formation of a two-dimensional layered structure in vacuum and dry atmosphere. The highly oriented and ordered TMD transfer film (Figure 1) significantly shortens the film run-in time. This work provides technical support for optimizing the synergistic effects of different tribochemical reactions between lubricating and non-lubricated phases. The relevant research results were published in ACS Appl. Mater. Interfaces.7 (2015) 12943-12950, ​​J. Phys. D: Appl. Phys. 48 (2015) 175304, Surf. Coat. Technol. 296 (2016) 185-191, Appl. Surf. Sci. 364 (2016) 249-256, Sci. Rep. 6 (2016) 25378, Fusion Eng. Des. 104 (2016) 40-45, Journal of Tribology. 36 (2016) 1-6, Appl Surf. Sci. 406 (2017) 30-38 and Phys. Chem. Chem. Phys. 19 (2017) 8161-8173, etc., and was selected by Phys. Chem. Chem. Phys. for the 2017 back cover (back Cover Figure 2).
The above work has solved the problems of low bearing capacity and environmental insensitivity, leading to film failure, etc., encountered during long-life, high-load bearing surface coating processes and complex and varied environmental service processes. In the domestic EAST Tokamak device remote operation arm joint bearing The successful application of the lubrication and protection field of the secondary deployment mechanism of the microsatellite solar windsurfing was successfully applied (Figure 3).
This series of research work has received long-term support from the National Natural Science Foundation of China (51227804 and 11475236), Lanzhou Institute of Chemical Talents, and the State Key Laboratory of Solid Lubrication.
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