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Open AccessArticle

Reactive Pulsed Laser Deposition of Clustered-Type MoSx (x ~ 2, 3, and 4) Films and Their Solid Lubricant Properties at Low Temperature

1
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh., 31, 115409 Moscow, Russia
2
Immanuel Kant Baltic Federal University, A. Nevskogo St 14, 236016 Kaliningrad, Russia
3
Mechanical Engineering Research Institute of the Russian Academy of Sciences, Bardina St 4, 119334 Moscow, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 653; https://doi.org/10.3390/nano10040653
Received: 26 February 2020 / Revised: 18 March 2020 / Accepted: 27 March 2020 / Published: 1 April 2020
(This article belongs to the Special Issue Laser Synthesis and Modification of Materials at the Nanoscale)
We studied the tribological properties of amorphous molybdenum sulfide (MoSx) thin-film coatings during sliding friction in an oxidizing environment at a low temperature (−100 °C). To obtain films with different sulfur contents (x ~ 2, 3, and 4), we used reactive pulsed laser deposition, where laser ablation of the Mo target was performed in H2S at various pressures. The lowest coefficient of friction (0.08) was observed during tribo-testing of the MoS3 coating. This coating had good ductility and low wear; the wear of a steel counterbody was minimal. The MoS2 coating had the best wear resistance, due to the tribo-film adhering well to the coating in the wear track. Tribo-modification of the MoS2 coating, however, caused a higher coefficient of friction (0.16) and the most intensive wear of the counterbody. The MoS4 coating had inferior tribological properties. This study explored the mechanisms of possible tribo-chemical changes and structural rearrangements in MoSx coatings upon contact with a counterbody when exposed to oxygen and water. The properties of the tribo-film and the efficiency of its transfer onto the coating and/or the counterbody largely depended on local atomic packing of the nanoclusters that formed the structure of the amorphous MoSx films. View Full-Text
Keywords: reactive pulsed laser deposition; solid lubricants; nanoclusters; molybdenum sulfides; coefficient of friction; wear; low temperature reactive pulsed laser deposition; solid lubricants; nanoclusters; molybdenum sulfides; coefficient of friction; wear; low temperature
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MDPI and ACS Style

Fominski, V.; Demin, M.; Nevolin, V.; Fominski, D.; Romanov, R.; Gritskevich, M.; Smirnov, N. Reactive Pulsed Laser Deposition of Clustered-Type MoSx (x ~ 2, 3, and 4) Films and Their Solid Lubricant Properties at Low Temperature. Nanomaterials 2020, 10, 653.

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