Comparative assessment of tribotechnical characteristics of hard-lubricating coatings of various application methods and friction conditions in relation to tests in a normal atmosphere and in a vacuum

A comparative assessment of the relative wear and antifriction characteristics of friction pairs with magnetron and suspension solid lubricating coatings (SLC) based on MoS₂ and the combined composition MoS₂+Sb₂O₃+Au, operating according to the schemes of clean sliding and reverse motion in conditions of a normal atmosphere, dry nitrogen and vacuum, was carried out. For conditions of a normal atmosphere up to a surface friction temperature of less than 150 °C, the lowest relative wear is detected by SLC VNII NP 212 suspension application during sliding friction. At a contact temperature of 150–200 °C, the relative wear of the coatings under consideration is the same and amounts to and (1,8–8,0.10^–7 mm₃/(N.?m). With an increase in the contact temperature above 200 °C, the relative wear of SLC VNII NP 212 suspension application during sliding friction increases significantly. For an atmosphere of dry nitrogen and vacuum, the combined SLC in the Scharf MoS₂+Sb₂O₃+Au magnetron deposition exper,2iments shows a 4.7-fold decrease in relative wear and tear relative to SLC of pure MoS₂ of the usual composition. For magnetron sputtering similar in type to MoS2 SLC and friction conditions at a contact temperature of 51–55 °C for a coating thickness of 1 µm, the relative wear during sliding friction in the Miyoshi experiments is 7.8 times less than with reversible friction in the Scharf experiments. The friction coefficient is 11.7 times higher.
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