Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Papken Hovsepian, Paranjayee Mandal, Arutiun Ehiasarian, György Sáfrán, Roel Tietema, Dave Doerwald

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A molybdenum and tungsten doped carbon-based coating (Mo–W–C) was developed in order to provide low friction in boundary lubricated sliding condition at ambient and at high temperature. The Mo–W–C coating showed the lowest friction coefficient among a number of commercially available state-of-the-art DLC coatings at ambient temperature. At elevated temperature (200 °C), Mo–W–C coating showed a significant reduction in friction coefficient with sliding distance in contrast to DLC coatings. Raman spectroscopy revealed the importance of combined Mo and W doping for achieving low friction at both ambient and high temperature. The significant decrease in friction and wear rate was attributed to the presence of graphitic carbon debris (from coating) and ‘in-situ’ formed metal sulphides (WS2 and MoS2, where metals were supplied from coating and sulphur from engine oil) in the transfer layer.
Original languageEnglish
Pages (from-to)260-274
Number of pages15
JournalApplied Surface Science
Early online date7 Jan 2016
Publication statusPublished - 15 Mar 2016
Externally publishedYes


  • sliding friction
  • tribochemical reaction
  • wear
  • Raman spectroscopy

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