Tribological behaviour of C-alloyed transition metal dichalcogenides (TMD) coatings in different environments

Article

DOI: 10.1007/s10999-007-9034-2

Cite this article as:
Evaristo, M., Polcar, T. & Cavaleiro, A. Int J Mech Mater Des (2008) 4: 137. doi:10.1007/s10999-007-9034-2

Abstract

W-S-C films were deposited by non-reactive sputtering from a carbon target incrusted with WS2 pellets in the eroded zone. This process allows depositing coatings with a wide range of compositions, with a precise control of their carbon content. Before the deposition, a Ti interlayer was interposed between the film and the substrate to improve the final adhesion. The carbon content in W-S-C system was varied from 29 at.% to 70 at.%, which led to an hardness enhancement from 4 GPa up to 10 GPa where the maximum hardness was reached in films with a carbon content between 40 at.% and 50 at.%. The tribological behaviour of the coatings was evaluated by pin-on-disk testing, in environments with different humidity levels. Generally, the tribological performance of W-S-C coatings in environments with moderate to high humidity is better for coatings with high carbon content. Friction coefficients, as 0.05 or lower could be reached at low humidity ranges (<7%) to all compositions. However, for higher humidity values, friction coefficient increased up to 0.30 in the W-S-C film with low carbon content whereas it was kept approximately constant for the others compositions.

Keywords

C-TMD Low friction Self-lubricant Wear behaviour WS2 

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Manuel Evaristo
    • 1
  • Tomas Polcar
    • 1
    • 2
  • Albano Cavaleiro
    • 1
  1. 1.ICEMS – Departamento Engenharia MecânicaFaculdade de Ciências e Tecnologia da Universidade de CoimbraCoimbraPortugal
  2. 2.Faculty of Transportation Sciences, Department of Applied MathematicsCTU in PraguePrague 1Czech Republic

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