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Micro-Tribological Study of Cobalt Alloys with and Without a Carbon Coating

Published online by Cambridge University Press:  21 February 2011

Hsin-Fu Wang ,
John C. Nelson  and
William W. Gerberich
Hsin-Fu Wang
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
John C. Nelson
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
William W. Gerberich
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract

Continuous microscratch tests on an uncoated and a diamond-like carbon coated CoCrMo alloy were performed in air to evaluate the micro-friction and micro-tribology by utilizing a load and depth sensing instrument. By using a diamond-like carbon coating, the friction coefficient for a small applied load was found to decrease compared to the CoCrMo substrate. The hard diamond-like carbon coating prevents the local plastic yielding of the micro-contacts and the adhesion between the metal/metal surfaces during the microscratch tests. However, the effect of the diamond-like carbon coating on the friction was not seen when the applied load is high.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 785
Copyright
Copyright © Materials Research Society 1995

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