The invention provides a thermal barrier coating material as well as a preparation method and application thereof, and belongs to the technical field of ultra-high-temperature protective coatings of aero-engines and gas turbines. A rare earth zirconate crystal structure is used as a target, the requirements for infrared radiation, high thermal expansion coefficient, low thermal conductivity and high fracture toughness of overtemperature service are fully considered, a pyrochlore crystal structure is reconstructed through Gd < 3 + >, Sm < 3 + > and Yb < 3 + > ternary rare earth, the proportion of components is regulated and optimized, the crystal defect concentration is increased, lattice distortion is enhanced through replacement of Yb < 3 + >, and the thermal conductivity of the rare earth zirconate crystal structure is improved. High-temperature infrared radiation heat transfer is effectively reduced, and high fracture toughness and excellent high-temperature resistance are realized on the basis of ensuring low heat conductivity and high thermal expansion coefficient of the material, so that the service life of the coating is prolonged. According to the invention, Ce < 4 + > replaces part of Zr < 4 + > or Hf < 4 + > crystal lattice sites, so that the defect concentration of the whole crystal is further increased, the heat conductivity of the material is reduced, and the properties such as corrosion resistance, high temperature resistance and fracture toughness are improved.
本发明提供了一种热障涂层材料及其制备方法和应用,属于航空发动机和燃气轮机超高温防护涂层技术领域。本发明以稀土锆酸盐晶体结构为靶向,充分考虑超温服役的红外辐射、高热膨胀系数、低热导率及高断裂韧性要求,通过Gd3+、Sm3+和Yb3+三元稀土重构烧绿石晶体结构,调控优化成分比例,增加晶体缺陷浓度,通过Yb3+的取代增强晶格畸变,有效降低高温红外辐射传热,在保证材料低热导率、高热膨胀系数基础上,实现高断裂韧性和优异的耐高温性能,进而延长涂层的使用寿命。本发明通过Ce4+对部分Zr4+或Hf4+晶体格位的取代,进一步增加整体晶体缺陷浓度,降低材料的热导率,提高抗腐蚀、耐高温及断裂韧性等性能。
High-toughness long-life ultrahigh-temperature thermal barrier coating material as well as preparation method and application thereof
一种高韧性长寿命超高温热障涂层材料及其制备方法和应用
2022-12-13
Patent
Electronic Resource
Chinese
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