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Oxidation and defect control of CVD SiC coating on three-dimensional C/SiC composites

Authors
Journal
Carbon
0008-6223
Publisher
Elsevier
Publication Date
Volume
40
Issue
12
Identifiers
DOI: 10.1016/s0008-6223(02)00103-3
Keywords
  • A. Carbon Composites
  • B. Coating
  • Oxidation

Abstract

Abstract Two kinds of multi-layer CVD SiC coatings were prepared on a three-dimensional C/SiC composite. Oxidation behavior of the coating and the composite were studied and the effect of defects in the coating on its oxidation protection property were investigated. Above 1200 °C, thickness of the oxide film formed on the coating was related to oxidation time by the Fick’s first law X( t) 2= Bt, the diffusion rate constant increased with oxidation temperature according to the Arrhenius’ relation ln B=−32 483/ T+1.4048. Morphology of the interface between the CVD SiC and its oxide film was different after oxidation at temperatures from 1200 to 1500 °C. It was interpreted by consideration of the interfacial stress produced by thermal expansion mismatch and the CO gas pressure produced by interfacial reaction.

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