双稀土改性锆酸锶热障涂层的CMAS腐蚀机理及缓解机制

开发具有低热导率、耐更高使用温度、抗CMAS(CaO-MgO-Al2O3-SiO2)腐蚀性能良好的新型陶瓷热障涂层材料是满足下一代高性能燃气轮机热端部件使用要求的技术难题。. 本课题采用溶液等离子喷涂制备不同稀土含量及显微结构的Yb2O3和Gd2O3双稀土改性SrZrO3涂层，通过座滴实验研究CMAS熔体对涂层的润湿、渗透、反应等界面行为，建立CMAS熔体对涂层的熔渗动力学方程。通过静态热腐蚀实验和燃烧台架实验研究CMAS作用下涂层的失效行为，揭示稀土元素含量及其存在形式对涂层腐蚀产物相组成、涂层力学性能的影响规律，阐明双稀土改性SrZrO3涂层的CMAS腐蚀机理及其缓解机制，提出抗CMAS腐蚀双稀土改性SrZrO3涂层的设计原则。. 通过课题研究，发展一种反应、润湿等界面行为可控的双稀土改性SrZrO3热障涂层，为该涂层材料在下一代高性能燃气轮机上的应用提供理论支持。

It is an important technological problem for hot-end components of the next generation advanced turbine engine to develop novel thermal barrier coatings (TBCs) materials, with low thermal conductivity, higher temperature application capability, as well as better CMAS (CaO-MgO-Al2O3-SiO2) corrosion resistance. . In this project, the Yb2O3 and Gd2O3 double rare-earth oxides co-doped SrZrO3 coatings with different contens of the rare-earch oxides and microstructures will be deposited by solution precursor plasma spray (SPPS) method. The wetting, infiltration, and reaction behavior of CMAS melt on the coatings will be investigated by sessile drop method to establish the infiltration kinetics equation. The fialure behaviors of the coatings in contact with CMAS will be investigated by static corrosion experiments and burner rig tests, revealing the influences of the content of rare-earth oxides and their existence forms on the corrosion products and mechnical properties of the coating. Therefore, the corrosion mechnism and migigation mechanism of the coatings uder CMAS attack will be elucidated, and a design principle for the double rare-earth co-doped SrZrO3 coating will be proposed. . As a result, the double rare-earth co-doped SrZrO3 TBC materials with controlled reaction, and wetting behavior will be developed, thus supporting the advanced turbine engine industry in theory.