Performance optimization of sol-derived C/Mullite composites by introducing a PyC-SiC double-layer interfacial coating
Performance optimization of sol-derived C/Mullite composites by introducing a PyC-SiC double-layer interfacial coating
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通过引入 PyC-SiC 双层界面涂层优化溶胶衍生的 C/莫来石复合材料的性能
DOI：
10.1016/j.ceramint.2019.12.084
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发表时间：
2020-05
影响因子：
5.2
通讯作者：
Weiguo Mao
中科院分区：
文献类型：
--
作者：
Wei Zhang;Qingsong Ma;Kuanhong Zeng;Weiguo Mao
本论文采用溶胶-浸渍-干燥-加热的方法制备了三维碳纤维预制体增强莫来石复合材料。为了进一步优化C/Mullite复合材料的性能，本文采用聚合物热解法制备了PyC-SiC双层界面涂层。研究了PyC-SiC界面涂层对C/Mullite复合材料力学性能和抗热震性能的影响。结果表明，PyC-SiC界面涂层在保护碳纤维、削弱界面结合、缓解纤维与基体间的热失配等方面起到了积极作用。结果表明，C/莫来石复合材料的弯曲强度和断裂功均提高了40%以上，且在空气中的抗热震性也得到了改善。
Three-dimensional carbon fiber preform reinforced mullite (C/Mullite) composites have been prepared through the sol-impregnation-drying-heating route in our previous studies. To further optimize the performance of C/Mullite composites, a PyC-SiC double-layer interfacial coating was introduced by polymer pyrolysis in this paper. The effects of PyC-SiC interfacial coating on the mechanical properties and thermal shock resistance of C/Mullite composites were investigated. It was found that the PyC-SiC interfacial coating played a positive role in protecting carbon fiber, weakening interfacial bonding and alleviating thermal mismatch between fiber and matrix. Consequently, both flexural strength and fracture work of C/Mullite composites were increased by more than 40%, and the thermal shock resistance in air was also improved.
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