An Assessment of the Durability of Friction Couples with Solid Lubricant Coatings of Various Compositions Produced by Domestic and Foreign Manufacturers

Based on the conventional concept of destruction of friction couples with suspension-type solid lubricant coatings due to thermo-fluctuation destruction of the binders, a conclusion is drawn on the expediency of an assessment of the working life of friction couples of the specified type using the durability parameter. An algorithm of assessment is developed based on the universal correlation dependences of the temperature of friction on the load-velocity parameters of the assembly and on the thermo-correlation dependences of durability on the temperature of friction for solid lubricant coatings of various compositions. Corresponding dependences are obtained that can be used in the proposed algorithm. To perform a comparative assessment of the working life of domestic and foreign-made solid lubricant coatings, main contact characteristics and the temperature of friction are determined for a sliding couple with Molykote solid lubricant coatings for testing on the LFW-1 (ASTMD-2714) friction machine using the ‘bar–ring’ sliding scheme. The assessment of the durability of the friction couple with solid lubricant coatings Molykote 3400 A and those of Russian production has shown satisfactory agreement, with deviation being 10.5 %.

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