Friction induced phase transformation of pulsed laser deposited diamond-like carbon

Friction induced phase transformation of pulsed laser deposited diamond-like carbon Structural transformations in the sliding friction of hydrogen-free diamond-like carbon (DLC) films prepared by pulsed laser deposition are investigated. Stainless steel disks were coated with 0.5 μm thick DLC films, and ball-on-disk sliding experiments were performed with steel and sapphire balls in humid air, a nitrogen atmosphere, and under vacuum. Friction coefficients of about 0.1 are reported. The low friction is related to a friction induced transformation of the surface into a graphite-like phase and the formation of an adherent transfer film of this material on the counterface. Surface enhanced micro-Raman studies of the wear tracks, wear debris and the transfer film demonstrated that an sp 3 to sp 2 phase transition has occurred in the wear tracks on the DLC film surface. The formation of a graphite phase after several thousands of cycles caused a humidity sensitive behavior of the DLC films and an increase in the friction coefficient in high vacuum conditions. A lubricating sp 2 -rich layer on the surface of the hydrogen-free DLC films is proposed as the reason for their extremely low wear rates in ambient environments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Diamond and Related Materials Elsevier

Friction induced phase transformation of pulsed laser deposited diamond-like carbon

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Publisher
Elsevier
Copyright
Copyright © 1996 Elsevier Science S.A. All rights reserved
ISSN
0925-9635
eISSN
1879-0062
D.O.I.
10.1016/0925-9635(96)00538-9
Publisher site
See Article on Publisher Site

Abstract

Structural transformations in the sliding friction of hydrogen-free diamond-like carbon (DLC) films prepared by pulsed laser deposition are investigated. Stainless steel disks were coated with 0.5 μm thick DLC films, and ball-on-disk sliding experiments were performed with steel and sapphire balls in humid air, a nitrogen atmosphere, and under vacuum. Friction coefficients of about 0.1 are reported. The low friction is related to a friction induced transformation of the surface into a graphite-like phase and the formation of an adherent transfer film of this material on the counterface. Surface enhanced micro-Raman studies of the wear tracks, wear debris and the transfer film demonstrated that an sp 3 to sp 2 phase transition has occurred in the wear tracks on the DLC film surface. The formation of a graphite phase after several thousands of cycles caused a humidity sensitive behavior of the DLC films and an increase in the friction coefficient in high vacuum conditions. A lubricating sp 2 -rich layer on the surface of the hydrogen-free DLC films is proposed as the reason for their extremely low wear rates in ambient environments.

Journal

Diamond and Related MaterialsElsevier

Published: Nov 1, 1996

References

  • Appl. Phys. Lett.
    Knight, D.S.; Weimer, R.; Pilione, L.; White, W.B.
  • Appl. Phys. Lett.
    Singer, I.L.; Bolster, R.N.; Wegand, J.; Fayeulle, S.; Stupp, B.C.

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