Sliding wear of silicon carbide modified by etching with chlorine at various temperatures |
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| Authors: | H.-J. Choi H.-T. Bae J.-K. Lee B.- C. Na M.J. McNallan D.-S. Lim |
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| Affiliation: | 1. Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. The Ningbo Branch of Ordnance Science Institute of China, Ningbo 315103, China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The effect of reaction temperature on the formation of a carbon layer on the surface of SiC has been investigated. Subsequently, the tribological properties of the formed carbon layers were studied. The experimental procedure involved exposing reaction-bonded SiC balls to a flowing gas mixture of 5% Cl2, 2.5% H2, and Ar at a high temperature of 800, 1000, or 1200 °C. A ball-on disk tribometer was used to investigate the friction and wear behavior of the treated specimens. While partially unreacted SiC phases were observed in the layer modified at 800 °C, rhombohedral graphite crystals were formed in the layer modified at 1200 °C. Compared to untreated SiC, the treated SiC materials were found to have relatively low friction coefficients and better wear resistance. Increasing the treatment temperature was found to improve the tribological performance of the resulting surface-modified SiC balls. A possible reason for this tribological improvement has been discussed based on the observed carbon phases. |
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