Abstract
To investigate ultraviolet (UV) radiation effects on tribological properties of Mo/MoS2-Pb-PbS film, ultraviolet (UV) radiation exposure tests were carried out for 20 h, 40 h, 60 h and 80 h by space UV radiation simulation device developed by our team, which can reach 3 UV radiation intensity. The exposure time in test was equivalent to the radiation of 100 h, 200 h, 300 h and 400 h in the space. Then, the vacuum friction test of Mo/MoS2-Pb-PbS thin film was performed under the 6 N load and 100 r/min, and friction test time of each sample was 20 min. By SEM, TEM, XPS the composition and morphology of Mo/MoS2-Pb-PbS film surface after UV radiation were analyzed. UV radiation could change the microstructure significantly and relative content of S element and MoS2 on the surface of the films decreased, and light mass loss of the films occurred. The tribological properties will also recover with the increase of sliding time, although the friction coefficient fluctuation of the film increased at the starting stage of the friction test. The damage of Mo/MoS2-Pb-PbS under UV irradiation was mainly caused by the volatilization of the enriched S element in the surface layer due to the high temperature heating of UV irradiation.
Highlights
Accepted: 10 January 2022Molybdenum disulfide is widely used in the lubrication field of space equipment due to its good properties such as high and low temperature resistance, radiation resistance, and vacuum cold welding [1,2,3]
The analysis showed that the decrease of lubricating components and the tribological properties in the film may be due to some physical changes in the film during UV radiation
The non-bonding S element enriched in the surface layer of Mo-based multi-component composite solid lubricating film will be precipitated in large quantities, and a small reason for the thin metal sulfide film formed by sulfur infiltration to maintain good friction and wear resistance for a long time
Summary
Molybdenum disulfide is widely used in the lubrication field of space equipment due to its good properties such as high and low temperature resistance, radiation resistance, and vacuum cold welding [1,2,3]. It was found that the effect of vacuum ultraviolet radiation on the life of MoS2 solid lubrication coating was mainly related to the composition of the coating [5]. The addition of SiO2 significantly improves the tribological properties and ultraviolet radiation resistance of the composite coating. For these reasons as well as proven operation in harsh environments, the unique properties of MoS2 motivated the study of its suitability as a material in space electronics applications [9,10], Julian J. Mo/MoS2 -Pb-PbS composite films were exposed to UV radiation environment, and the high vacuum friction test was carried out to study the microstructure and tribological properties of Mo-based multicomponent composite solid lubricating film before and after UV radiation. The damage mechanism of the film after UV radiation was briefly analyzed
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