The oxidation behavior of MoSi2-CrSi2-Si/SiC coating for C/C composites in H2O-O2-Ar atmosphere: Experiment and first-principle investigation

被引:19
作者
Guo, Liping [1 ]
Fu, Qiangang [1 ]
Sun, Jia [1 ]
Cheng, Chunyu [1 ]
机构
[1] Northwestern Polytech Univ, Carbon Carbon Composites Res Ctr, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
基金
中国国家自然科学基金;
关键词
Ceramic matrix composites; Weight loss; High temperature corrosion; COATED CARBON/CARBON COMPOSITES; ELECTRONIC-STRUCTURE CALCULATIONS; HIGH-TEMPERATURE OXIDATION; WATER-VAPOR; POPULATION ANALYSIS; RESISTANCE; MICROSTRUCTURE; CORROSION; ENVIRONMENTS; CERAMICS;
D O I
10.1016/j.ceramint.2017.04.020
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The MoSi2-CrSi2-Si/SiC multi-component coating was prepared by two-step pack cementation on carbon/carbon composites. To investigate the effect of water vapor on the anti-oxidation of the coated samples, two kinds of atmosphere (50%H2O-50%O-2, 50%O-2-50%Ar) were designed for comparison with a total pressure of 1 atm at 1773 K. The results showed that, after being tested for 10 h, the weight loss of the coated samples in O-2+Ar and H2O+O-2 were 0.243% and 0.436% respectively. The reasons for different weight losses can be attributed to the water vapor, which could degrade the protective ability of the glass layer formed by SiO2 and Cr2O3 and thereby accelerate the oxidation of MoSi2 and CrSi2. Based on the Mulliken analysis calculated by the first principle, the corresponding water vapor corrosion resistance of the prepared coating was in the following order: SiC > MoSi2 > CrSi2, which was consistent with the experimental phenomenon.
引用
收藏
页码:8858 / 8865
页数:8
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