铌基/硅化物高温抗氧化涂层的界面反应加速了涂层功能的退化，抑制基体与涂层元素互扩散是铌合金抗氧化涂层亟待解决的重要问题。本项目选用合金化元素Al协同SiC颗粒共同强韧化的MoSi2作为喷涂粉末，首次尝试采用热喷涂协同热等静压技术，借助SiC-Mo(Si,Al)2涂层中的"铝池"作用，创造性地提出在预氧化铌基表面与涂层界面处原位生成Al2O3薄膜。系统研究铌基预氧化工艺、热等静压参数和涂层中Al含量对生成Al2O3扩散障的影响规律并揭示其形成机制；详细研究涂层在1100～1300℃的氧化动力学和微观组织演变规律，阐明Al2O3陶瓷层在氧化过程中的功能效应与作用机制，诠释涂层的高温抗氧化机理；厘清Al2O3阻挡层的微观组织（包括厚度）与阻挡效果、涂层抗氧化性能以及涂层界面稳定性之间的内在关系。本研究可为铌合金抗氧化性能的提高提供科学依据，对解决其它难熔金属的高温抗氧化问题具有较好的借鉴意义。

The interface reaction between the Nb-based matreial and silicide coating accelerates the degradation of the silicide coating for the function of oxidation resistance.It is a very important problem to inhibit interdiffusion between the substrate and silicide coating. The MoSi2 powder is used as a spray powder reinforced with the alloying elements Al and SiC particles. A Al2O3 layer is prepared between the surface of pre-oxidized Nb-based material and the oxidation resistance coating during the course of high temperature insostatic pressing.The influence of parameters of pre-oxidation,high temperature insostatic pressing and the content of Al of SiC-Mo(Si,Al)2 coating on the former of Al2O3 layer are studied, the formation mechanism of Al2O3 layer is also to be explained.The rule of oxidation kinetics and microstructure during the oxidation course at the temperature from 1100 to 1300℃ are studide.The oxidation resistance mechanism and diffusion barrier mechanism are also discussed.The influence rules of the microstructure of Al2O3 layer on the barrier effect,the oxidation resistance capaxity and the stability of interface are also to be revealed.This study can provide guidance and basis for improving the performance of Nb-based high temperature oxidation resistance coating.It also has a good reference to solve the high temperature oxidation resistance problem for the other refractory metals.