Table of Contents
Journal of Coatings
Volume 2013, Article ID 613178, 7 pages
http://dx.doi.org/10.1155/2013/613178
Research Article

Friction and Wear Properties of Cold Gas Dynamic Sprayed Composite Coatings

State Key Laboratory of Corrosion and Protection, Institute of Metal Research, CAS, Shengyang 110016, China

Received 21 March 2013; Revised 11 June 2013; Accepted 30 June 2013

Academic Editor: Wenya Li

Copyright © 2013 Jie Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Different proportions of α-Al2O3 and pure Al powders were coated onto AZ91D magnesium alloy substrates by cold gas dynamic spray. The microstructure and morphologies of the coatings were observed by scanning electron microscope. The friction and wear properties were tested by a ball-on-disk wear tester. It was found that the interfaces between grains and substrates formed close boundaries. It is revealed that the composite coatings could increase the friction or wear properties of the coatings. It was observed that the wear of coatings was converted from adhesive wear into abrasive wear with α-Al2O3 particles increasing and that the adhesive wear accompanied with abrasive wear would increase the wear rate of coatings.