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

• Main Authors: Xiang Yang, Cao Feng, Zhi-hang Peng, Wang Yi, Guang-de Li
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2017-09-01
• Series: Journal of Asian Ceramic Societies
• Subjects: C/SiC; Composites; Microstructural; Mechanical properties
• Online Access: http://www.sciencedirect.com/science/article/pii/S2187076417300982

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.