Microstructure and tribological behaviors of C/C-BN composites fabricated by chemical vapor infiltration

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Abstract

In this paper carbon fiber reinforced carbon-boron nitride binary matrix composites (C/C-BN) were prepared by chemical vapor infiltration (CVI). The infiltration of BN in the CVI process was controlled by the diffusion of BCl 3, and BN matrix was distributed homogeneously in the porous carbon fiber reinforced carbon matrix composites (C/C) due to the good infiltration ability of BN. The as-received C/C-BN composites were composed of 92 vol% C and 8 vol% BN. Both the friction coefficient and wear rate of C/C composites decreased significantly by the incorporation of BN. After heat-treated at 1600 °C, the interlayer spacing of CVI BN decreased to 3.36 Å, and CVI BN with high crystalline degree displayed the excellent lubricating effect, leading to the decrease of friction coefficient and wear rate. The improvement of the tribological properties also was partially attributed to the improved oxidation resistance and the formation of friction film by the incorporation of BN matrix.

Original languageEnglish
Pages (from-to)6137-6144
Number of pages8
JournalCeramics International
Volume38
Issue number8
DOIs
StatePublished - Dec 2012

Keywords

  • Boron nitride
  • C. Friction
  • C. Wear resistance
  • CVI

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