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Mechanical and tribological properties of sputtered Mo–Se–C coatings

Polcar, T., Evaristo, M., Stueber, M. and Cavaleiro, A (2009) Mechanical and tribological properties of sputtered Mo–Se–C coatings [in special issue: Tribology of Engineered Surfaces ] Wear, 266, (3-4), pp. 393-397. (doi:10.1016/j.wear.2008.04.010).

Record type: Article


Transition metal dichalcogenides belong to the more developed class of materials for solid lubrication. However, the main limitation of these materials is the detrimental effect of air humidity causing an increase in the friction. In previous works, molybdenum diselenide has been shown to be a promising coating retaining low friction even in very humid environment. In this study, Mo–Se–C films were deposited by sputtering from a C target with pellets of MoSe2. Besides the evaluation of the chemical composition, the structure, the morphology, the hardness and the cohesion/adhesion, special attention was paid to the tribological characterization.

The C content varied from 29 to 68 at.% which led to a progressive increase of the Se/Mo ratio. As a typical trend, the hardness increases with increasing C content. The coatings were tested at room temperature with different air humidity levels and at temperatures up to 500 °C on a pin-on-disc tribometer. The friction coefficient of Mo–Se–C coatings increased with air humidity from ?0.04 to ?0.12, while it was as low as 0.02 at temperature range 100–250 °C. The coatings were very sensitive to the elevated temperature being worn out at 300 °C due to adhesion problems at coating–titanium interface.

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e-pub ahead of print date: 6 June 2008
Published date: 5 February 2009
Keywords: molybdenum diselenide, self-lubrication, dry sliding, elevated temperature
Organisations: nCATS Group


Local EPrints ID: 199811
ISSN: 0043-1648
PURE UUID: a1ab9d82-33f8-44bd-a8d7-1f6ad2a31a63
ORCID for T. Polcar: ORCID iD

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Date deposited: 20 Oct 2011 16:04
Last modified: 18 Jul 2017 11:15

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Author: T. Polcar ORCID iD
Author: M. Evaristo
Author: M. Stueber
Author: A Cavaleiro

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