A Comparative Assessment of Efficiency of Foreign-Made Friction Pairs with Solid Lubricant Coating when in Sliding and Reverse Motion

This paper presents an analysis of testing friction pairs with Molykote solid lubricant coatings for the conditions of reverse motion. A technique for assessing the durability of such friction pairs is proposed. Based on the 2008 data, the durability of couplings with Molykote solid lubricant coatings turned out to be lower in the reverse motion compared to the sliding motion for various load and speed conditions of friction according to ASTM 2714 (test LFW-1). According to the 2014 studies, for a number of such coupling, the specified parameter turned out to be 2.2 higher in reverse than in sliding motion. Based on the thermo-fluctuation theory developed by the authors for friction pairs with solid lubricant coatings, it is recommended to estimate operational life of such pairs in reverse motion using pre-calculated coefficients of durability reduction with regards to sliding friction for identical temperature conditions of the reverse and sliding motion. The calculation of conjugation with solid lubricant coatings based on MoS2 with epoxy binding allowed the authors to estimate the coefficient of durability reduction as 1.72.

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