Coefficient of friction and wear of sputtered a-C thin coatings containing Mo

Petr Novák, J. Musil, R. Čerstvỳ, A. Jäger

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The paper reports on preparation of ~3000nm thick a-C coatings containing Mo, interrelationships between their mechanical properties, a coefficient of friction μ and wear rate k and the effect of Mo content in the a-C coating on these interrelationships. The Mo-C coatings were prepared by sputtering using an unbalanced magnetron (UM) equipped with a graphite targets (Ø=100mm, 99.9% purity) fixed to the UM cathode with Mo ring of different inner diameter Ø i. The content of Mo in the a-C coating was controlled by Ø i. It is shown that μ and k of the coating strongly depend not only on its hardness H but also on its effective Young's modulus E *=E/(1-ν 2), the ratios H/E *, H 3/E *2 and the elastic recovery W e; here E is the Young's modulus and ν is the Poisson ratio. The ratio H 3/E *2 characterizes the resistance of coating to plastic deformation. Coatings with a low amount of Mo composed of nanograins of carbides dispersed in a-C matrix exhibit low values of μ≈0.07 and k≈10 -7mm 3/Nm measured with WC ball at the rotation speed v=0.05m/s, total sliding length l=1000m and the load L=2N.

Original languageEnglish
Pages (from-to)1486-1490
Number of pages5
JournalSurface and Coatings Technology
Issue number5
Publication statusPublished - 25 Nov 2010


  • Friction
  • Magnetron sputtering
  • Mechanical properties
  • Mo-C coating
  • Wear

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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