Intermediate temperature tribological behavior of carbon nanotube reinforced plasma sprayed aluminum oxide coating

  • Keshri A
  • Singh V
  • Huang J
 et al. 
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Abstract

Tribological behavior of plasma sprayed carbon nanotube (CNT) reinforced aluminum oxide (Al 2 O 3 ) composite coatings was examined at room temperature, 573 K and 873 K using tungsten carbide (WC) ball-on-disk tribometer. The weight loss due to wear of Al 2 O 3 coating was found to be increasing with the temperature while Al 2 O 3 -CNT coating showed a decreasing trend in the weight loss with the temperature. Relative improvement in the wear resistance of Al 2 O 3 -CNT coating compared to Al 2 O 3 coating was found to be 12% at room temperature which gradually increased to ∼ 56% at 573 K and ∼ 82% at 873 K. Protective layer as a result of tribo-chemical reaction was observed on the wear track of both of the coatings. The improvement in the wear resistance of Al 2 O 3 -CNT coating was attributed to three phenomena viz. (i) higher hardness at the elevated temperature as compared to Al 2 O 3 coating, (ii) larger area coverage by protective film on the wear surface at the elevated temperature and (iii) CNT bridging between splats. The coefficient of friction (COF) of Al 2 O 3 coating was nearly constant at room and elevated temperature whereas COF for Al 2 O 3 -CNT coating decreased at the elevated temperature (873 K). © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Aluminum oxide
  • Carbon nanotubes
  • Coefficient of friction
  • High temperature wear
  • Plasma spray
  • Tribochemical reaction

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Authors

  • A.K. Keshri

  • V. Singh

  • J. Huang

  • S. Seal

  • W. Choi

  • A. Agarwal

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