Oxidation resistance of SiCf/SiC composites with a PyC/SiC multilayer interface at 500 °C to 1100°C

• Published in: Corrosion science 2020-05, Vol.167, p.108522, Article 108522
• Main Authors: Wang, Lian-Yi, Luo, Rui-Ying, Cui, Guang-yuan, Chen, Zhao-feng
• Format: Article
• Language: English
• Subjects: Ceramic fiber reinforced ceramics; Ceramic fibers; Ceramic matrix composites; Fiber composites; Mechanical properties; Multilayers; Oxidation; Oxidation behavior; Oxidation resistance; PyC/SiC multilayer interface; Self healing materials; Self-healing characteristics; SiCf/SiC composite; Silicon carbide
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2020.108522

[Display omitted] •A novel PyC/SiC multilayer interface with self-healing characteristics was designed for the SiCf/SiC composites.•The oxidation behavior and the mechanical evolution during oxidation were researched in this paper.•The dependence of mechanical evolution on oxidation temperatures was analyzed, which is associated with the evolution of fiber/matrix bonding strength caused by the varied oxidation behaviors at different temperatures. SiC fiber-reinforced SiC ceramic matrix composites with a novel PyC/SiC multilayer interface were oxidized at 500 °C–1100 °C for more than 400 h. The oxidation resistance of the composites was evaluated by microstructural and mechanical evolution. Results showed that the PyC layer of composites was completely consumed after oxidation at 500 °C and 700 °C, thereby resulting in significant mechanical-property degradation. By contrast, 97 % and 101 % strength remained after oxidation at 900 °C and 1100 °C, respectively. The transformation was associated with the self-healing characteristics of the composites beyond 900 °C.