期刊
CERAMICS INTERNATIONAL
卷 41, 期 5, 页码 6956-6964出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.01.151
关键词
C/C-ZrC-SiC composites; Pre-oxidation treatment; Bonding strength; Thermal shock
资金
- National Natural Science Foundation of China [51221001, 51222207]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [12-BZ-2014]
To improve the bonding strength and thermal shock resistance of SiC coating for C/C-ZrC-SiC composites, a transition layer with mechanical interlocking structure was constructed at the interface by pre-oxidation treatment and chemical vapor deposition. For the coated specimens with pre-oxidation treatment at 1073 K for 5 min, the bonding strength increased from 2.0 to 4.0 N, and the mass loss percentage decreased by 52.5% after 12-time thermal cycling between 1773 K and room temperature in air. The transition interlocking structure can effectively alleviate the mismatch between the coefficients of thermal expansion of SiC coating and C/C-ZrC-SiC substrate, improving the bonding strength and thermal shock resistance. As the pre-oxidation time increases, a rugged and loose ZrO2-SiO2 layer will be formed at the interface, which is disadvantageous to the bonding strength and thermal shock resistance of SiC coating for C/C-ZrC-SiC composites, and results in the debonding and collapse of the coating. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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