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Fretting wear rate of sulphur deficient MoSx coatings based on dissipated energy

Published online by Cambridge University Press:  31 January 2011

Xiaoling Zhang*
Affiliation:
Department MTM, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 710049 Xi'an, People's Republic of China
W. Lauwerens
Affiliation:
Institute for Materials Research, Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium, and Center for Scientific and Research in Metal Manufacturing, B-3590 Diepenbeek, Belgium
L. Stals
Affiliation:
Institute for Materials Research, Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
Jiawen He
Affiliation:
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 710049 Xi'an, People's Republic of China
J-P. Celis
Affiliation:
Department Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
*
a)Address all correspondence to this author.
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Abstract

The fretting wear of sulphur-deficient MoSx coatings with different crystallographic orientations has been investigated in ambient air of controlled relative humidity. The coefficient of friction and the wear rate of MoSx coatings sliding against corundum depend not only on fretting parameters like contact stress, fretting frequency, and relative humidity, but also strongly on the crystallographic orientation of the coatings. For randomly oriented MoSx coatings, the coefficient of friction and the wear rate increased significantly with increasing relative humidity. In contrast, basal-oriented MoSx coatings were less sensitive to relative humidity. The coefficient of friction of both types of MoSx coatings decreased on sliding against corundum with increasing contact stress and decreasing fretting frequency. A correlation between dissipated energy and wear volume is proposed. This approach allows detection in a simple way of differences in fretting wear resistance between random- and basal-oriented MoSx coatings tested in ambient air of different relative humidity.

Type
Articles
Copyright
Copyright © Materials Research Society 2001

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