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Tribological behavior of CrN coating on aluminum alloys deposited by arc ion plating

Published online by Cambridge University Press:  31 January 2011

Fei Zhou ,
Chang-Min Suh ,
Seock-Sam Kim  and
Ri-Ichi Murakami
Fei Zhou
Affiliation:
School of Materials Science –013, People's Republic of China
Chang-Min Suh
Affiliation:
School of Mechanical Engineering, Kyungpook National University, Daegu, 702-701, Republic of Korea
Seock-Sam Kim
Affiliation:
School of Mechanical Engineering, Kyungpook National University, Daegu, 702-701, Republic of Korea
Ri-Ichi Murakami
Affiliation:
Department of Mechanical Engineering, Tokushima University, Tokushima 770-8506, Japan
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Abstract

Dry sliding wear and friction tests of CrN coating on two types of aluminum alloy substrates, 6061 Al and 7075 Al, deposited by arc ion plating were performed with a ball-on-disk tribometer. The effects of normal load and the mechanical properties of the substrate on the friction coefficient and wear resistance of CrN coating were investigated. The worn surfaces were observed by scanning electron microscopy. The results show that surface microhardness of CrN-coated 7075 Al is higher than that of CrN-coated 6061 Al. With an increase in normal load, wear volume increases, while the friction coefficient decreases. The friction coefficient of CrN-coated 6061 Al is higher than that of CrN-coated 7075 Al, while the wear resistance of CrN-coated 6061 Al is lower than that of the CrN-coated 7075 Al. This indicates that the substrate mechanical properties have strong influence on the friction coefficient and wear of CrN coating. The main wear mechanism was fragments of CrN coating, caused by apparent plastic deformation of substrate during wear tests.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3133 - 3138
Copyright
Copyright © Materials Research Society 2002

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