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

被引：92

作者：

Cheng, LF ^{[1
]}

Xu, YD ^{[1
]}

Zhang, LT ^{[1
]}

Luan, XG ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

CARBON | 2002年 / 40卷 / 12期

基金：

中国国家自然科学基金;

关键词：

carbon composites; coating; oxidation;

D O I：

10.1016/S0008-6223(02)00103-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degreesC, 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 degreesC. It as interpreted by consideration of the interfacial stress produced by thermal expansion mismatch and the CO gas pressure produced by interfacial reaction. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：2229 / 2234

页数：6

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