Oxidation protection of multilayer CVD SiC/B/SiC coatings for 3D C/SiC composite

Yongsheng Liu, Laifei Cheng, Litong Zhang, Shoujun Wu, Duo Li, Yongdong Xu

科研成果: 期刊稿件文章同行评审

70 引用 (Scopus)

摘要

A CVD boron coating was introduced between two CVD SiC coating layers. EDS and XRD results showed that the CVD B coating was a boron crystal without other impurity elements. SEM results indicated that the CVD B coating was a flake-like or column-like crystal with a compact cross-section. The crack width in the CVD SiC coating deposited on CVD B is smaller than that in a CVD SiC coating deposited on CVD SiC coating. After oxidation at 700 °C and 1000 °C, XRD results indicated that the coating was covered by product B2O3 or B2O3·xSiO2 film. The cracks were sealed as observed by SEM. There was a large amount of flake-like material on hybrid coating surface after oxidation at 1300 °C. Oxidation weight loss and residual flexural strength results showed that hybrid SiC/B/SiC multilayer coating provided better oxidation protection for C/SiC composite than a three layer CVD SiC coating at temperatures from 700 °C to 1000 °C for 600 min, but worse oxidation protection above 1000 °C due to the large amount of volatilization of B2O3 or B2O3·xSiO2.

源语言英语
页(从-至)172-177
页数6
期刊Materials Science and Engineering: A
466
1-2
DOI
出版状态已出版 - 25 9月 2007

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