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Friction of self-lubricating W-S-C sputtered coatings sliding under increasing load

Polcar, Tomas, Evaristo, Manuel and Cavaleiro, Albano (2007) Friction of self-lubricating W-S-C sputtered coatings sliding under increasing load Plasma Processes and Polymers, 4, supplement 1, S541-S546. (doi:10.1002/ppap.200731402).

Record type: Article


W-S-C films were deposited by non-reactive magnetron sputtering from a carbon target with several pellets of WS2 incrusted in the zone of the preferential erosion. The number of the pellets was changed to modify the carbon content in the films, which varied from 26 up to 70 at.-%. Alloying W-S films with carbon led to a substantial increase in the hardness in the range of 4–10 GPa; the maximum hardness was obtained for the coatings with carbon contents close to 40 at.-%. XRD diffraction patterns showed that there was a loss of crystallinity with the increase of the carbon content in the film. C-contents in the range (37–66 at.-%) were selected for sliding tests (pin-on-disk, 100Cr6 steel ball as a counterpart) carried out in humid air under increasing contact load. The friction coefficient was observed to decrease continuously with increasing load. The wear tracks and wear debris were also analyzed by Raman spectroscopy to understand the structural transformations induced by the increasing load. The friction results were compared with existing models for pure transition metal dichalcogenides (TMD), and it could be concluded that the friction mechanisms of W-S-C coatings fundamentally differ from those of pure TMD

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Published date: April 2007
Keywords: hardness, magnetron sputtering, self-lubricant, thin films, tribology, WSC
Organisations: nCATS Group


Local EPrints ID: 199765
ISSN: 1612-8850
PURE UUID: 5a48efd6-75de-4169-ad64-0bf0501a6e80
ORCID for Tomas Polcar: ORCID iD

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Date deposited: 20 Oct 2011 11:22
Last modified: 18 Jul 2017 11:15

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Author: Tomas Polcar ORCID iD
Author: Manuel Evaristo
Author: Albano Cavaleiro

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