Microstructural evolution of coating-modified 3D C/SiC composites after annealing in wet oxygen at different temperatures |
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| Authors: | Siwei Li Zude Feng Yongsheng Liu Weihua Zhang Litong Zhang |
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| Affiliation: | a Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005, China
b National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | Two types of coating-modified 3D C/SiC, coated with CVD SiC/SiC/SiC (type I) and CVD SiC/amorphous-BC/SiC (type II), are subjected to a 14 vol.% H2O/8 vol.% O2/78 vol.% Ar atmosphere at 700, 1000 and 1200 °C up to 100 h. Microstructure and corrosion behaviour are investigated using a variety of characterization techniques. The type II shows a better oxidation resistance than type I during annealing at relatively low temperatures. Nevertheless, residual strength of the type I annealed above 1000 °C is enhanced by healing of many micron-sized defects. Interfacial bond strength of the composites is reasonably improved after annealing. |
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| Keywords: | A. Ceramic matrix composites B. TEM B. SEM C. Oxidation C. Interfaces |
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