超高温陶瓷及其复合材料的稀土改性研究进展

超高温陶瓷及其复合材料因具有耐超高温、轻质和抗氧化烧蚀等优点，目前已成为航空航天领域热结构材料研究的热点和前沿。基于稀土化合物在热障涂层等领域的优异性能和成功应用，研究人员将稀土化合物引入超高温陶瓷及其复合材料中，改善氧化层的结构和性质，以期解决超高温陶瓷基复合材料氧化层增长速度偏快和宽温域高低温循环氧化层易剥落等问题。本文综述了稀土改性超高温陶瓷及其复合材料的研究现状，分析探讨了改性机理，并展望了未来的研究发展方向。

Research Progress on Rare Earth Modified Ultra-High Temperature Ceramics and Their Composites

Ultra-high temperature ceramics and their composites have become the focus and frontier of thermal structural materials research in the field of aerospace because of their advantages of ultra-high temperature resistance, lightweight and anti-oxidation ablation. Based on the excellent performance and successful application of rare earth compounds in thermal barrier coatings and other fields, researchers have introduced rare earth compounds into ultra-high temperature ceramics and their composites to improve the structure and properties of oxide layer in order to solve the problems of rapid growth of oxide layer of ultra-high temperature ceramic matrix composites and easy spalling of high and low temperature circulating oxygenation layer in a wide temperature range. This paper summarized the research status of rare earth modified ultra-high temperature ceramics and their composites, analyzed and discussed the modification mechanism, and looked forward to the future research and development direction.