HfC-TaC改性对C/SiC-ZrC复合材料静态氧化行为的影响

利用HfC-TaC对C/SiC-ZrC陶瓷基热结构复合材料进行改性，提升C/SiC-ZrC材料的抗氧化性能。结合前驱体浸渍裂解和化学气相沉积法制备陶瓷基复合材料，并通过静态氧化实验（1600 ℃/5 h和1600 ℃/20 h）检验其抗氧化性能。结合弯曲强度测试和失重情况分析，发现HfC-TaC可以有效改善C/SiC-ZrC复合材料的氧化行为，且能够使其满足力学性能要求。借助X射线衍射仪、扫描电子显微镜和能谱仪等仪器，对复合材料的晶相结构、微观结构等进行了分析，结果显示：均匀的元素分布和基体中各陶瓷组元间良好的融合度是C/SiC-ZrC复合材料抗氧化性能提升的原因。

Effects of HfC-TaC Modification on Static Oxidation Behavior of C/SiC-ZrC Composites

HfC-TaC was employed to modify the C/SiC-ZrC composites and to improve their oxidation resistance. The composites were fabricated by the combined process of precursor infiltration and pyrolysis method and chemical vapor deposition method, and the oxidation resistance was evaluated by static oxidation tests (1600 °C/5 h and 1600 °C/20 h). According to the test results of flexural strength and mass loss, it is found that HfC-TaC can effectively improve the anti-oxidation behavior of C/SiC-ZrC composites without obviously decreasing their mechanical properties. By virtue of X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometry, the crystal structure and microstructure of composites were analyzed. Results show that the superior anti-oxidation behavior of C/SiC-ZrC composites after HfC-TaC modification can be ascribed to the uniform element distribution and well-integrated components in the matrix.