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

• Published in: Journal of Asian Ceramic Societies 2017-09, Vol.5 (3), p.370-376
• Main Authors: Yang, Xiang, Feng, Cao, Peng, Zhi-hang, Yi, Wang, Li, Guang-de
• Format: Article
• Language: English
• Subjects: C/SiC; Composites; Mechanical properties; Microstructural
• ISSN: 2187-0764; 2187-0764
• DOI: 10.1016/j.jascer.2017.07.001

•High-temperature (>1500°C) oxidation of PIP-C/SiC composites were discussed and compared.•The effect of temperature (>1500°C) on PIP-C/SiC composites were investigated.•The high-temperature flexural of PIP-C/SiC composites was tested and the oxidation mechanism were discussed. 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.