Title: Friction behaviours of molybdenum-based coatings under fretting condition

Authors: Kyungmok Kim

Addresses: Ecole Nationale Superieure des Mines de Saint-Etienne, ENSM-SE, Centre for Health Engineering, UMR CNRS 5146, IFR 143, Department of Biomechanics and Biomaterials, 158 cours Fauriel, F-42023, Saint-Etienne Cedex 02, France

Abstract: This paper investigates friction coefficient behaviour of molybdenum-based coatings under fretting conditions. Fretting wear tests are performed under experimental conditions similar to those found at dovetail connections of an aero-engine. One specimen and two flat-and-rounded pads are used for each fretting wear test. Specimens are coated with Mo-MoS2 or Mo-N coatings, while fretting pads are coated with MoS2 particles. Friction coefficient values are measured during fretting wear tests and are directly compared with each other. It is identified that Mo-N coatings maintain better anti-fretting performance than Mo-MoS2 coatings. Results also show that a notable difference exists between friction coefficient evolutions of coatings. The friction coefficient value of Mo-MoS2 coating increases almost linearly, while that of Mo-N coating increases rapidly after short decrease following an initial running-in period. Finally, friction coefficient evolutions are expressed as a linear or an exponential form.

Keywords: friction behaviour; molybdenum based coating; Mo-N; fretting wear; Mo-MoS2; friction coefficient; MoS2; molybdenum disulfide; dovetail connections; aeroengines; aircraft engines.

DOI: 10.1504/IJSURFSE.2011.041400

International Journal of Surface Science and Engineering, 2011 Vol.5 No.2/3, pp.169 - 179

Published online: 21 Jul 2011 *

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