Long-term oxidation behaviors of C/SiC composites with a SiC/UHTC/SiC three-layer coating in a wide temperature range

Long-term oxidation behaviors of C/SiC composites with a SiC/UHTC/SiC three-layer coating in a wide temperature range
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SiC/UHTC/SiC三层涂层C/SiC复合材料在宽温度范围内的长期氧化行为

DOI:
10.1016/j.corsci.2018.10.017
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发表时间:
2019-02
期刊:
影响因子:
8.3
通讯作者:
Hui-Ming Cheng
Hui-Ming Cheng
中科院分区:
材料科学1区
文献类型:
--
作者:
Chenglong Hu;Sufang Tang;Shengyang Pang;Hui-Ming Cheng

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采用化学气相沉积和电刷烧结技术,设计了SiC/UHTC/SiC三层涂层,并在C/SiC复合材料表面进行了涂覆,实现了在大温度范围内的长期氧化保护。在1100°C和1300°C的空气中暴露114小时和1500°C的空气中暴露68小时后,涂层复合材料的质量损失分别仅为0.36、1.65和3.45 mg/cm2。zrb2基超高温陶瓷层(UHTC)与SiC层的协同作用可显著降低材料的质量损失率。详细讨论了不同温度下的氧化过程和保护机理。
A SiC/UHTC/SiC triple layer was designed and coated on C/SiC composites by chemical vapor deposition and brushing-sintering techniques to achieve long-term oxidation protection in a wide temperature range. After exposure to 1100 °C and 1300 °C for 114 h, and 1500 °C for 68 h in air, the coated composites exhibited mass losses of only 0.36, 1.65 and 3.45 mg/cm2, respectively. The low mass loss rates can be attributed to the synergistic effects of the ZrB2-based ultra-high temperature ceramic (UHTC) and SiC layers. The oxidation process and protective mechanism at different temperatures were discussed in detail.
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