Evolution of microstructure and mechanical properties of PIP-C/SiC composites after high-temperature oxidation

Journal of Asian Ceramic Societies

Guang-de Li¹  Wang Yi¹  Zhi-hang Peng²  Xiang Yang²  Cao Feng² 

[1] Equipment Academy of The Rocket Force, Beijing 100094, PR China;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, Hunan, PR China;

关键词: C/SiC;    Composites;    Microstructural;    Mechanical properties;   

DOI  :  10.1016/j.jascer.2017.07.001

来源: DOAJ

【 摘 要 】

C/SiC composites had been prepared by PIP process. The evolution of microstructure and mechanical properties after high-temperature (>1500 °C) oxidation were discussed and compared. The results showed that PIP-C/SiC composites had been severely damaged after oxidation tests, micro-cracks and holes emerged along with the increasing of the oxidation temperature, which lead to the decreasing of mechanical properties. After high-temperature flexural tests, the thermal mismatch between C fibers and SiC matrix gradually caused the expansion of micro-cracks, which lead to the decreasing of flexural strength. The mechanical performance deteriorated because defects in the matrix increased and some fibers were oxidized. For long-time use at higher temperature (≥1600 °C), it was necessary to develop a more protective coating with higher stability and melting temperature.

【 授权许可】

Unknown