Tribology of carbon layers fabricated from sic exposed to different h 2/cl2 gas mixtures

Hyun Ju Choi, Heung Taek Bae, Dae-Soon Lim

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4 Citations (Scopus)

Abstract

Silicon carbide-based ceramics are some of the best materials for tribological applications. However, their tribological properties stifi need to be improved for certain uses under severe conditions. In this study, carbon layers were produced by the exposure of ball and disc type SiCs to various compositions of chlorine-hydrogen gas mixtures at a temperature of 1000 °C for 20 hrs. After the chlorination of the silicon carbide materials, the modified layers were characterized by XRD, Raman, and FE-SEM. The effect of the hydrogen gas content on the carbide-derived carbon (CDC) layers and their resulting tribological properties have been investigated. The tribological behaviors of the CDC layers were studied using a ball-on-disk tribometer. Sificon nitride and chlorinated silicon carbide balls were selected as the counterpart material. The results showed that the wear resistance and frictional coefficients of the surface-modified ball and disk-type SiCs were significantly improved compared to those of untreated silicon carbide specimens. Increasing the hydrogen content of the gas mixture improved the tribological performance of the resulting carbon layers. The use of a higher applied load also improved the tribological performance. The possible mechanisms responsible for the tribological properties of the carbon layers are discussed.

Original languageEnglish
Pages (from-to)330-334
Number of pages5
JournalJournal of Ceramic Processing Research
Volume10
Issue number3
Publication statusPublished - 2009 Jun 1

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Keywords

  • Chlorination
  • Friction and wear
  • Hydrogen
  • Silicon Carbide
  • Surface roughness

ASJC Scopus subject areas

  • Ceramics and Composites

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