Multi-layer CVD-SiC/MoSi2-CrSi2-Si/B-modified SiC oxidation protective coating for carbon/carbon composites

被引：19
作者：
Feng, Tao [1 ]
Li, Hejun [1 ]
Shi, Xiaohong [1 ]
Yang, Xi [1 ]
Wang, Shaolong [1 ]
He, Zibo [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
VACUUM | 2013年 / 96卷
基金：
中国国家自然科学基金;
关键词：
Carbon/carbon composites; Coating; Oxidation; CARBON-CARBON COMPOSITES; C/C COMPOSITES; THERMAL-EXPANSION; MICROSTRUCTURE; RESISTANCE; BEHAVIOR; B2O3;
D O I：
10.1016/j.vacuum.2013.03.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To further improve the oxidation resistance of coating for carbon/carbon (C/C) composites, a multi-layer CVD-SiC/MoSi2-CrSi2-Si/B-modified SiC coating was prepared on the surface of C/C composites by pack cementation and chemical vapour deposition method, respectively. The microstructures, oxidation and thermal shock resistance of the coating were studied. The influence of B content in pack powder on the microstructure and oxidation resistance of B-modified SiC coating was also investigated. The results show that the B-modified SiC coating prepared with 10 wt.% B exhibited the best oxidation protection ability for C/C composites at 1173 K. The multi-layer coatings could protect the C/C composites at 1173 K for 30 h and 1873 K for 200 h, and endure 30 thermal cycles between 1873 K and room temperatures. The oxidation resistance and thermal shock resistance is mainly attributed to their dense structure and self-sealing property. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：52 / 58
页数：7
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