B2O3 modified SiC-MoSi2 oxidation resistant coating for carbon/carbon composites by a two-step pack cementation

被引：86
作者：
Fu, Qian-Gang [1 ]
Li, He-Jun [1 ]
Wang, Yong-Jie [1 ]
Li, Ke-Zhi [1 ]
Shi, Xiao-Hong [1 ]
机构：
[1] NW Polytech Univ, CC Composites Res Ctr, Key Lab Ultrahigh Temp Composites, Xian 710072, Peoples R China
来源：
CORROSION SCIENCE | 2009年 / 51卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Ceramic matrix composites; Intermetallic; Oxidation; CARBON-CARBON COMPOSITES; SI-MO; C/C COMPOSITES; PROTECTION;
D O I：
10.1016/j.corsci.2009.06.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To protect carbon/carbon (C/C) composites against oxidation, a B2O3 modified SiC-MoSi2 coating was prepared by a two-step pack cementation. The microstructure and the oxidation resistant property of the coating were studied. The results show that, the as-received coating is a dense structure, and is composed of alpha-SiC, beta-SiC and MoSi2. The B2O3 modified SiC-MoSi2 coating has excellent oxidation resistant property, and can protect C/C composites from oxidation at 1773 K in air for more than 242 h. The failure of the coating was considered to arise from the existence of the penetration cracks in the coating during the slow cooling from 1873 to 673 K. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2450 / 2454
页数：5
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