Oxidation behavior of 3D SiCf/SiBCN composites at 800–1200 °C |
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| Authors: | Haiming Xu Yuqing Peng Zihan Wei Mengqian Wang Aijun Li Sansan Shuai Xingang Luan |
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| Affiliation: | 1. Institute of Materials, Shanghai University, Shanghai 200072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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| Abstract: | 3D SiCf/BN–SiC/SiBCN composites were fabricated via precursor impregnation and polymer infiltration pyrolysis (PIP). Oxidation behavior of the composites heated in air at 800 °C, 1000 °C and 1200 °C for 50 h was investigated. Following the oxidation treatment, it was found that the bending strength of the composites at different oxidation temperatures was degraded. The weight loss of the composites decreased gradually over the range of oxidation times of 1–50 h. In order to clarify the oxidation mechanism of the composites, reconstructed images, microstructures, phase compositions, the oxide layer formed on the composites and main chemical reactions were all analyzed. It was revealed that the degradation in the fracture strength of the composites was closely related to the oxidation of SiBCN matrix and BN-SiC interphase, whereas there was no signs of oxidation products about SiC fiber, which indicated that SiC fiber could be protected from oxygen by SiBCN matrix at 800?1200 °C in air. |
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| Keywords: | Oxidation Mechanical properties Self-healing |
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