Impact of introducing SiC and Si on microstructure and oxidation resistance of MoSi2/SiC coated C/C composites prepared by SAPS

被引：15

作者：

Liu, Fei ^{[1
]}

Li, Hejun ^{[2
]}

Zhang, Wei ^{[3
]}

Yao, Xiyuan ^{[2
]}

Fu, Qiangang ^{[2
]}

机构：

[1] Xian Polytech Univ, Coll Mat Sci & Engn, Xian 710048, Peoples R China

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

[3] Xian Univ Technol, Fac Printing Packaging Engn & Digital Media Techn, Xian 710048, Shaanxi, Peoples R China

来源：

VACUUM | 2020年 / 179卷

基金：

中国国家自然科学基金;

关键词：

MoSi2; Si; SiC; Carbon/carbon composites; Supersonic atmospheric plasma spraying; Oxidation resistance; CARBON/CARBON COMPOSITES; HIGH-TEMPERATURE; CARBON; PROTECTION; ANTIOXIDATION; COATINGS; BEHAVIOR;

D O I：

10.1016/j.vacuum.2020.109477

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to evaluate and compare the differences of their anti-oxidation and thermal shock performances, two kinds of coatings including MoSi2-SiC and MoSi2-Si were deposited on the surface of SiC coated carbon/carbon composites (C/C composites) by supersonic air plasma spraying (SAPS), respectively. Their microstructures and phase components were observed by SEM, EDS and XRD. The results showed that the porosity and bonding strength of MoSi2-Si/SiC coating were 4.27% and 15.7 N, while the MoSi2-SiC/SiC coating were 10.58% and 12.56 N. Due to form more glassy SiO2 layer on the surface of the MoSi2-Si/SiC coating, it could effectively protect C/C composites from oxidation for 178 h in air at 1500 degrees C with a weight loss of 0.58% and concurrently withstood 15 times thermal shock cycling. However, the MoSi2-SiC/SiC coating had a weight loss of 0.98% after oxidation for 127 h in the same experimental condition. The failure mechanisms of the two coatings were investigated.

引用

页数：8

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