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 journalArticle

11 Citations (Scopus)

Abstract

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
Volume205
Issue number5
DOIs
Publication statusPublished - 25 Nov 2010

Fingerprint

coefficient of friction
Wear of materials
Friction
coatings
Coatings
modulus of elasticity
Elastic moduli
Graphite
Poisson ratio
carbides
plastic deformation
Sputtering
Carbides
sliding
balls
Plastic deformation
purity
Cathodes
hardness
graphite

Keywords

  • 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

Cite this

Coefficient of friction and wear of sputtered a-C thin coatings containing Mo. / Novák, Petr; Musil, J.; Čerstvỳ, R.; Jäger, A.

In: Surface and Coatings Technology, Vol. 205, No. 5, 25.11.2010, p. 1486-1490.

Research output: Contribution to journalArticle

Novák, Petr ; Musil, J. ; Čerstvỳ, R. ; Jäger, A. / Coefficient of friction and wear of sputtered a-C thin coatings containing Mo. In: Surface and Coatings Technology. 2010 ; Vol. 205, No. 5. pp. 1486-1490.
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