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- W4308484375 abstract "Tribological components cost only a fraction of the entire spacecraft, but they often lead to failures that partially or completely disrupt the spacecraft, resulting in a mission compromise. Mechanical components used in space applications have to withstand extreme environmental conditions, thus inhibiting the use of a liquid-based lubricant. Therefore, solid-based lubricating materials are employed for space applications. In this work, a PVD process was used to deposit a nano-structured coating of MoS 2 on AMS 5898 stainless steel. The structure, morphology, and chemical composition were evaluated using X-Ray diffraction, FESEM, EDS, and Raman spectroscopy. The nano-tribological and nano-mechanical behaviour of the developed coating was investigated under various loads. Further, a ramp load nano-scratch test was also used to determine the adherence of the coating to the substrate. Results indicate that the MoS 2 nano-structured coating has a polycrystalline structure with basal planes oriented perpendicular to the surface of the substrate. A substantial decrease in coefficient of friction was observed with an increase in applied load, while the wear rate showed an increasing trend with the applied load. A very low coefficient of friction of 0.02 and a low wear rate of 4.69×10 -6 mm 3 /m were obtained during this study. The hardness and Young’s modulus increased with an increase in the indentation load due to the reverse indentation size effect and substrate effect, respectively. The maximum values of hardness and Young’s modulus were determined to be 9.46 GPa and 350.50 GPa, respectively. Furthermore, the coating adhered well to the substrate, with an adhesion strength of 1286.5 µN, and a coefficient of friction of 0.18 was reported during scratch testing. • Cutting and Polishing of disc samples of AMS 5898 stainless steel. Discs were polished to achieve mirror finishing with surface roughness values 10 nm. • Coating of MoS 2 was applied using PVD pulse magnetron sputter coating machine and coating thickness was measure using 3D profilometer. The thickness of the coating was measured to be 76 nm and the surface roughness of the coating was determined using SPM and was found to be less than 5 nm • Mechanical properties of coating, such as hardness,E and scratch adhesion were measured using Nano mechanical system. • Tribological tests were conducted using both nano mechanical and nano-tribometer to measure friction and wear properties of nano coatings of MoS 2 . • Surface morphological studies and surface elemental analysis were done using varios facilities, optical microscope, FESEM with EDS, Raman spectroscopy, XRD etc to identify causes of friction/wear and wear mechanism." @default.
- W4308484375 created "2022-11-12" @default.
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- W4308484375 date "2023-02-01" @default.
- W4308484375 modified "2023-09-29" @default.
- W4308484375 title "Nano-mechanical and nano-tribological characterisation of self-lubricating MoS2 nano-structured coating for space applications" @default.
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- W4308484375 doi "https://doi.org/10.1016/j.triboint.2022.108017" @default.
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