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Microstructure Characterization of 3D C/SiC Composites in Combustion Gas Environments

Microstructure Characterization of 3D C/SiC Composites in Combustion Gas Environments
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摘要 C/SiC composites prepared by chemical vapor infiltration(CVI) were subjected to a stationary loading of 160 MPa in a combustion gas environment with flame temperature of 1300 ℃.Lifetime of C/SiC composites in such environment was measured.Microstructures of the composites after the testing were also characterized by SEM.The experimental results indicate the lifetime of C/SiC composites is average 2.3 hours in combustion gas environments.The combustion gas flow accelerates the damage of carbon fibers and the failure of the composites by speeding up the diffusion of gas reactants and products,destroying the layer of SiO2 on the surface of SiC coating and bringing fused SiO2 inside the composites.The fracture face of C/SiC is uneven,i e,a flat area close to the windward side and a pulling-out of long fibers near the leeward side,which results from the directionality effect of the combustion gas flow. C/SiC composites prepared by chemical vapor infiltration(CVI) were subjected to a stationary loading of 160 MPa in a combustion gas environment with flame temperature of 1300 ℃.Lifetime of C/SiC composites in such environment was measured.Microstructures of the composites after the testing were also characterized by SEM.The experimental results indicate the lifetime of C/SiC composites is average 2.3 hours in combustion gas environments.The combustion gas flow accelerates the damage of carbon fibers and the failure of the composites by speeding up the diffusion of gas reactants and products,destroying the layer of SiO2 on the surface of SiC coating and bringing fused SiO2 inside the composites.The fracture face of C/SiC is uneven,i e,a flat area close to the windward side and a pulling-out of long fibers near the leeward side,which results from the directionality effect of the combustion gas flow.
作者 张钧
出处 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第6期957-961,共5页 武汉理工大学学报(材料科学英文版)
基金 Funded by the Natural Science Foundation of China (No. 50820145202) the Natural Science Basic Research Plan in Shanxi Province of China(No.2009JQ6005)
关键词 C/SiC composites MICROSTRUCTURE combustion gas C/SiC composites microstructure combustion gas
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