基于纳米稀土锆酸盐的热障涂层材料研究进展

Research Progress of Nanostructured Rare-Earth Zirconate Thermal Barrier Coating Materials

稀土锆酸盐材料因其独特的晶体结构、优异的高温稳定性、低热导率等优点被认为是最具应用前景的新型热障涂层材料之一。掺杂、高熵化以及第二相增韧作为改善稀土锆酸盐材料热膨胀系数低、断裂韧性差等问题的常用手段而被广泛研究。基于近20年来热喷涂纳米涂层的发展与成功应用,纳米结构稀土锆酸盐材料有望成为新型热障涂层技术获得突破的关键。本文首先简述了稀土锆酸盐热障涂层材料的研究进展,然后将稀土锆酸盐原料粉体纳米化对热障涂层材料的热导率、热膨胀系数、断裂韧性及抗烧结性能的影响规律进行归纳和总结。在此基础上,分析了稀土锆酸盐纳米热障涂层材料的制备及涂层性能研究中存在的问题并指出其发展方向。

Rare-earth zirconate material is considered as one of the most promising new thermal barrier coating materials due to its unique crystal structure,excellent high-temperature stability,and low thermal conductivity.In order to improve the low thermal expansion coefficient and poor fracture toughness of rare earth zirconate materials,doping,high entropy,and second phase tougheners are widely studied.Based on the development and successful application of thermal spray nanocoatings in the past two decades,nano-structured rare earth zirconate materials are expected to become the key to the breakthrough of new thermal barrier coating technology.In this paper,the research progress of rare-earth zirconate thermal barrier coating materials is briefly reviewed,and then the influence of nano-sized rare earth zirconate raw powder on thermal conductivity,thermal expansion coefficient,fracture toughness,and sintering resistance of thermal barrier coating materials is summarized.On this basis,problems in fabrication avenues of nanostructured rare-earth zirconate thermal barrier coating materials and their relationship with coating properties are briefly analyzed and prospected.