Wear Process and Analysis of Lubrication Failure about Sputtering MoS2 Composite Solid Films Applied to Spacecraft

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The solid MoS2 composite films which were doped with Sb2O3 were investigated by means of UMT-2 tribometer. The worn surface morphology of balls and discs during different worn phases were measured on a high resolution microscope. The main chemical elements S,Mo in the worn surface were analyzed with PHI-5720 XPS. The worn areas of discs during different worn phases were measured with the aid of a nano scratch meter(CSM,Switzerland) .The results showed that the MoS2/Sb2O3 composite films had better oxidation resistance properties and longer wear-life(6.5×105r).The model of contact between the ball and its counterpart (steel disc) was converted into flat contact during the wear test. The MoS2 transferred from discs to the surface of the balls helped to contribute their longer wear-life. Continually accumulated wear at the interface between balls and their respective counterpart discs resulted in their lubrication failure, and the accompanying oxidation of MoS2 occurring partially accelerated lubrication failure of the solid MoS2 composite lubrication films.

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1671-1677

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January 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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