燃气涡轮发动机是飞机的心脏，镍基高温合金是发动机中最为关键的结构材料，为满足燃气涡轮发动机温度不断提高以及发动机恶劣环境下长寿命要求，研究具有良好抗高温氧化腐蚀性能的涂层以提高镍基高温合金的使用寿命具有十分重要的意义。 本项目针对具有良好抗高温氧化腐蚀性能的Co-Al-Y共渗涂层，研究制备工艺参数对Co-Al-Y共渗涂层相组成、形貌、成分分布及生长动力学的影响规律，阐明Co-Al-Y共渗涂层的组织形成机理；研究Co-Al-Y共渗涂层的高温氧化腐蚀动力学、氧化膜的组织结构、氧化膜的生长机制及粘附性能，揭示涂层的抗高温氧化腐蚀机理，研究环境因素（如温度和气氛等）及涂层与基体的互扩散行为对Co-Al-Y共渗涂层服役寿命影响规律，揭示Co-Al-Y共渗涂层的失效机理及主要影响因素，为发展镍基高温合金表面具有良好抗高温防护涂层材料与结构的涉及理论与方法奠定基础。

The gas turbine engine is the heart of airplane, and the advanced nickel based alloy is the most essential structural material in the engine. To meet the need that the gas turbine engine temperature keeps increasing as well as the long life under the severe circumstance, it is meaningful to study the oxidation and corrosion resistant coating to lengthen the nickel based alloy service life. The aim of the study is to investigate the effect of processing parameters on phase constitution, morphology, composition distribution and growth kinetics of the Co-Al-Y coating. Formation mechanism for the microstructure of the coating will be revealed. Corrosion kinetics of the coating, oxide microstructure, oxide growth mechanism, as well as adherence, will be investigated. Oxidation and corrosion resistant mechanism of the coating will be explored. At last, the coating failure mechanism and the major effect factors need to be studied as well. This project lays the foundation for developing the material and structure design theory and method for the protective coating on nickel based alloys.