热/环境障涂层用稀土铪酸盐的制备与性能研究现状

Research status on preparation and properties of RE hafnates for thermal/environmental barrier coatings

归纳总结稀土铪酸盐材料的种类、制备方法、热学性能、力学性能以及抗低熔点氧化物熔盐腐蚀(CMAS)和高温水蒸气腐蚀的研究进展。现有研究表明,稀土铪酸盐具有低热导率、优异的高温相稳定性以及较好的抗CMAS腐蚀性能等特点,在T/EBC涂层领域展现了较好的应用前景。但为了克服单一稀土铪酸盐在抗水蒸气腐蚀和CMAS方面的局限,未来仍需针对多稀土组元/高熵化的稀土铪酸盐开展系统研究,进一步明晰组元引起的晶格畸变对材料理化性能的影响机制,探索防热、抗水蒸气腐蚀和抗CMAS等功能一体化的铪酸盐热-力-化多性能耦合调控方法及对应的材料制备工艺。

The types,preparation methods,thermal and mechanical properties of rare earth hafnate materials and their corrosion behaviors exposed to low melting point silicate(CMAS)and high temperature water vapor are summarized.The previous investigations indicate that the rare earth hafnates have the characteristics of low thermal conductivity,excellent high-temperature phase stability and good resistance to CMAS corrosion,which shows a favorable application prospect in the field of thermal/environmental barrier coatings(T/EBCs).However,in order to overcome the limitations of a single-phase rare earth hafnate exposed to water vapor corrosion and CMAS,it is still necessary to carry out systematic studies on multi-rare earth components/high-entropy rare earth hafnate in the future,and further clarify the mechanism of influence of lattice distortion caused by components on physical and chemical properties of materials.Moreover,the coupled control method of thermal,mechanical and chemical properties of hafnate with integrated functions such as thermal protection,water vapor corrosion resistance and CMAS resistance and their corresponding material preparation processes should be explored.