三元层状YAl3C3超高温氧化机理及超高温热稳定性研究

新型三元层状YAl3C3具有优异的高温力学性能、高温抗氧化性能及超高温热稳定性，是极具潜力的单相即具备抗超高温氧化能力的材料。然而，目前关于其超高温氧化机理和超高温失稳机制等科学问题尚不清楚。本项目拟采用感应加热超高温测试平台，系统研究YAl3C3的超高温（1600-2000oC）氧化行为和超高温（2200-2600oC）热稳定性，分析YAl3C3氧化过程中介质传输的微观过程以及氧分压和氧化膜的相变对其成分和微观结构的影响规律，揭示氧化膜的生长机制和超高温氧化机理，探讨YAl3C3在超高温下的失稳机制，建立YAl3C3超高温氧化机理、失稳机制共同的晶体学基础。本项目研究可深化对YAl3C3及这类新型三元层状稀土碳化物（ReAl3C3）结构与性能关系的认识，同时对发展新型单相抗超高温氧化材料体系具有重要的借鉴意义。

Ternary layered YAl3C3 has excellent high temperature mechanical properties, high temperature oxidation resistance and ultra-high temperature thermal stability. YAl3C3 is expected to be a single-phase material with ultra-high temperature oxidation resistance. However, it is still unclear about its ultra-high temperature oxidation mechanism and ultra-high temperature instability mechanism. This project plans to use induction heating ultra-high temperature test equipment to systematically study the ultra-high temperature (1600-2000oC) oxidation behavior and ultra-high temperature (2200-2600oC) thermal stability of YAl3C3. These studies will understand the microscopic process of medium transmission, the influence of oxygen partial pressure and phase change of oxide film on the composition and microstructure of oxide film in the oxidation process of YAl3C3, as well as its instability mechanism at ultra-high temperature. This study will establish a common crystallographic basis for oxidation mechanism and instability mechanism of YAl3C3 at ultra-high temperature. These studies are of great significance for further understanding the relationship between structure and properties of YAl3C3 and these novel ternary layered rare earth carbides. At the same time, it also has important reference significance for the design and discovery of other novel single-phase ultra-high temperature oxidation resistant materials.