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Microstructure and mechanical properties of chromium oxide coatings

Published online by Cambridge University Press:  31 January 2011

Xiaolu Pang ,
Kewei Gao  and
Alex A. Volinsky
Xiaolu Pang
Affiliation:
Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China; and Department of Mechanical Engineering, University of South Florida, Tampa, Florida 33620
Kewei Gao*
Affiliation:
Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
Alex A. Volinsky
Affiliation:
Department of Mechanical Engineering, University of South Florida, Tampa, Florida 33620
*
a)Address all correspondence to this author. e-mail: kwgao@mater.ustb.edu.cn
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Abstract

Chromium oxide coatings were deposited on low-carbon steel by radiofrequency reactive magnetron sputtering at different oxygen flux values. X-ray diffraction, x-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy were used to investigate the microstructure of chromium oxide coatings. Varying oxygen flux changed the coating microstructure; as with increasing oxygen flux the chromium oxide coating undergoes amorphous-to-crystalline transformation. The coating developed strong (300) texture at higher oxygen flux. Hardness, elastic modulus, wear resistance, and adhesion were investigated by nanoindentation and pin-on-disk tests. With changes in the coating microstructure as a function of increased oxygen flux, hardness, elastic modulus, and wear resistance were improved, but its adhesion was weakened.

Keywords

AdhesionMicrostructureTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 12 , December 2007 , pp. 3531 - 3537
Copyright
Copyright © Materials Research Society 2007

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