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Lubricants 2016, 4(3), 32; doi:10.3390/lubricants4030032

Tribological Performance of MoS2 Coatings in Various Environments

1
Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany
2
AiF Projekt GmbH, 13156 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Ga Zhang
Received: 29 February 2016 / Revised: 23 August 2016 / Accepted: 29 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Tribofilms and Solid Lubrication)
View Full-Text   |   Download PDF [6353 KB, uploaded 7 September 2016]   |  

Abstract

Molybdenum disulfide (MoS2) is a well-known solid lubricant for tribosystems running in vacuum or dry gases. Problems arise due to its sensitivity to humidity, which is a drawback for its application under ambient conditions. However, by using a physical vapor deposition (PVD) process, deposition parameters can be optimized not only to gain a coatings structure with favorable frictional properties but also to minimize the sensitivity to attack by water molecules. Therefore, an improved tribological behavior even under moist conditions can be achieved. MoS2 coatings are also candidates for being applied at cryogenic temperatures. They already have proven their suitability, e.g., for sliding support elements between superconducting magnets of the nuclear fusion-experiment Wendelstein 7-X. However, these coatings were exclusively produced for this particular application and the utilization for more common tribosystems may be precluded due to cost considerations. In view of a wider range of applications, pure and Cr containing PVD-MoS2 coatings with an optimized structure were tested under varying environments including hydrogen gas and cryogenic temperatures. Results of the most promising variant are presented in this paper. View Full-Text
Keywords: solid lubrication; MoS2; extreme environments; hydrogen; cryogenic environment solid lubrication; MoS2; extreme environments; hydrogen; cryogenic environment
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Gradt, T.; Schneider, T. Tribological Performance of MoS2 Coatings in Various Environments. Lubricants 2016, 4, 32.

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