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Fabrication of CrAlN nanocomposite films with high hardness and excellent anti-wear performance for gear application

By Liping Wang, Guangan Zhang, R.J.K. Wood, S.C. Wang and Q.J. Xue

Abstract

CrAlN nanocomposite films with various Al contents were prepared by a reactive magnetron sputtering<br/>technique using Cr and Al targets in the reactive gas mixture. The micro-structure, mechanical properties and<br/>tribological behaviors of traditional CrN and newly-fabricated CrAlN nanocomposite films were compared.<br/>XRD results showed that single-phase fcc (face-centered cubic) CrAlN films formed a solid solution whereby<br/>Cr atoms were substituted by Al atoms. High resolution TEM results demonstrate that the CrAlN film<br/>possesses a unique amorphous/crystalline nanocomposite micro-structure with ?5 nm crystalline uniformly<br/>embedded into an amorphous matrix. In addition, CrAlN nanocomposite films exhibited relatively smaller<br/>grain size and denser structure when compared with CrN films. All the CrAlN nanocomposite films with the<br/>highest hardness being approximately 33.4 GPa exhibited much higher hardness and better wear resistance<br/>than traditional CrN films The excellent anti-wear performance of CrAlN nanocomposite films can be<br/>attributed to an amorphous/crystalline nanocomposite micro-structure and their high hardness. CrAlN<br/>nanocomposite films are considered as potential protective surfaces for such kinds of moving parts as gears,<br/>cutting tools and shafts used in engine and other mechanical mechanisms

Topics: TA
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:155151
Provided by: e-Prints Soton
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