Microstructure, Mechanical Properties and Tribological Behavior of Magnetron-Sputtered MoS2 Solid Lubricant Coatings Deposited under Industrial Conditions

Language
en
Document Type
Article
Issue Date
2021-05-05
First published
2021-04-15
Issue Year
2021
Authors
Seynstahl, Armin
Krauß, Sebastian
Bitzek, Erik
Meyer, Bernd
Merle, Benoit
Tremmel, Stephan
Editor
Publisher
MDPI
Abstract

Depositing MoS2 coatings for industrial applications involves rotating the samples during the PVD magnetron sputtering process. Here, we show that a 3-fold substrate rotation, along a large target–substrate distance given by the deposition unit, introduces porosity inside the coatings. The mechanical properties and wear behavior strongly correlate with the degree of porosity, which, in turn, depends on the temperature and the rotational speed of the substrate. Ball-on-disk tests and nanoindentation wear experiments show a consistent change in tribological behavior; first, a compaction of the porous structure dominates, followed by wear of the compacted material. Compaction was the main contributor to the volume loss during the running-in process. Compared to a dense coating produced without substrate rotation, the initially porous coatings showed lower hardness and a distinct running-in behavior. Tribological lifetime experiments showed good lubrication performance after compaction.

Journal Title
Coatings
Volume
11
Issue
4
Citation
Coatings 11.4 (2021): 455. <https://www.mdpi.com/2079-6412/11/4/455>
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