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Humidity resistant MoS2 coatings deposited by unbalanced magnetron sputtering

Title data

Vierneusel, Bernd ; Schneider, Thomas ; Tremmel, Stephan ; Wartzack, Sandro ; Gradt, Thomas:
Humidity resistant MoS2 coatings deposited by unbalanced magnetron sputtering.
In: Surface and Coatings Technology. Vol. 235 (25 November 2013) . - pp. 97-107.
ISSN 1879-3347
DOI: https://doi.org/10.1016/j.surfcoat.2013.07.019

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

MoS2 is a suitable solid lubricant for environments free of oxygen or water vapor (i.e. vacuum). Humid air degrades film properties due to oxidation accompanied by high wear and increasing coefficients of friction. The present study aims at the further development of sputtered pure MoS2 coatings, extending their applicability to varying environmental conditions by increasing the resistance against humidity. The systematic coating development process is supported by using an experimental Box-Behnken design with variations of the deposition parameters cathode voltage, target/substrate distance, temperature and argon gas pressure. In contrast to common one-factor-at-a-time (OFAT) studies, this approach enables a determination of interactions between deposition process parameters and tribological-mechanical MoS2 film properties. The tribological improvement focuses on a maximization of wear resistance in air and vacuum measured in ball-on-disk experiments. The evaluated mechanical properties are hardness, elastic modulus and residual stresses. These stresses were determined by the substrate curvature method. The study reveals that the residual stress state in the films and the hardness-to-modulus ratio are crucial for their tribological performance in humid air and vacuum environments. After a detailed determination of the relationships between deposition conditions and film properties, some selected microstructural analyses are presented which show that a substantially basal orientation of the lattice has positive effects on wear but also causes anisotropic film properties which result in fissile fracture of the coating if strong shock or point loads occur.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Unbalanced magnetron sputtering; MoS2; Humidity resistance; Residual stress
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD
Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Faculties > Faculty of Engineering Science
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Emerging Fields
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 15 Sep 2020 06:09
Last Modified: 09 Oct 2020 08:24
URI: https://eref.uni-bayreuth.de/id/eprint/57111