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Effect of a-CNx Coating on Tribological Properties of SiC Ceramic in Water

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Abstract:

The tribological behaviors of a-CNx/SiC tribo-pairs in water at low velocity were investigated and compared with SiC/SiC at room temperature. The results showed that the mean value µ of friction coefficients at steady state for a-CNx/SiC tribo-pairs (µ=0.075~0.12) was lower than that of SiC/SiC systems (µ=0.24~0.27). At a constant sliding speed, µ for two kinds of tribo-couples decreased with an increase in normal load, but at a constant normal load, µ for SiC/SiC system was nearly independence of sliding speed, whereas that of a-CNx/SiC tribo-pair decreased with sliding speed. The specific wear rates (ws) of ball and disk for a-CNx/SiC tribo-couples were considerably reduced by a factor up to 10 in the comparison to those of SiC/SiC systems. The observations of wear scars showed that the wear mechanism of CNx coating was micro-fracture of irregularities on the film surface for build-up of tribolayer, while that of SiC/SiC system was dominated by mechanical wear.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

2899-2904

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.2899

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Online since:

January 2005

Authors:

Fei Zhou, Koji Kato, Koshi Adachi

Keywords:

Amorphous Carbon Nitride Coatings, Friction, SiC Ceramic, Water Lubrication, Wear

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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