MICROANALYSIS OF THE FRICTION SURFACES OF SOLID LUBRICATING COATINGS OF VARIOUS TYPES OF APPLICATION

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Authors

P.N. KHOPIN, Dr. Sc., V.V. GRIB, Dr. Sc.

Abstract

As a result of the studies, it was found that the optimal thickness of the solid lubricant coating for suspension application is from 20 ± 5 microns (according to domestic literature data) to 7,62...12,7 microns (according to the US instructions), for magnetron deposition – 1 micron. During friction, the initial thickness of the suspension coating (~20 µm) decreases so much (2...3 µm) that contact of the highest microroughnesses occurs through the MoS2 lubricating film, which is also observed for magnetron applied solid lubricant coatings. Optimal roughness of base processing before suspension deposition is Ra = 0,3...0,6 µm, for magnetron deposition ‒ 0.2 µm. With a decrease in the roughness of the base processing before magnetron deposition with Ra = 0,05...0,4, the friction coefficient of the interface decreases from ff = 0,05 to 0,02.

Keywords

solid lubricating coatings, suspension and magnetron deposition, coating thickness, base roughness.