基于热障涂层的La_(2)Zr_(2)O_(7)材料改性研究进展  

Research Progress of La_(2)Zr_(2)O_(7) Material Modification Based on Thermal Barrier Coating

作　　者：张晓东[1] 王昊 梁逸帆 宋艺 王铀[1] ZHANG Xiaodong;WANG Hao;LIANG Yifan;SONG Yi;WANG You(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料保护》2024年第3期50-62,69,共14页Materials Protection

基　　金：国家自然科学基金(5237010620);国家科技重大专项(2017-VI-0020-0093);国家重点研发计划(2020YFB2007900);空间环境材料行为与评价技术国家重点实验室开放基金资助。

摘　　要：随着航空发动机不断向高推重比、高性能方向发展,传统、单一的热障涂层(Thermal barrier coating,TBC)已经不能满足热端部件严苛的服役要求。锆酸镧(La_(2)Zr_(2)O_(7))具有熔点高、高温下结构稳定、低热导率等优点,具有极好的隔热性能,有望成为新一代热障涂层候选材料,但在实际应用中仍存在两大关键问题,即热膨胀系数低和断裂韧性差。因此,La_(2)Zr_(2)O_(7)材料在服役过程中会因热失配而造成局部热应力集中,导致涂层过早剥落失效,严重影响涂层的服役寿命。国内外研究表明,对La_(2)Zr_(2)O_(7)材料进行改性可以有效解决上述问题。为此,系统分析了关于La_(2)Zr_(2)O_(7)材料改性的研究工作,将La_(2)Zr_(2)O_(7)材料改性总结为4类:第二相复合、稀土掺杂、纳米化和高熵化。重点介绍了4种不同改性方式对La_(2)Zr_(2)O_(7)材料热导率、热膨胀系数的影响及增韧机理,并对La_(2)Zr_(2)O_(7)材料改性研究工作进行总结和展望,以为La_(2)Zr_(2)O_(7)材料在热障涂层领域的应用提供理论支撑。With the continuous development of aero engines in the direction of high thrust-to-weight ratio and high performance,traditional and single thermal barrier coatings(TBCs)have been unable to meet the harsh service requirements of hot-end components.Lanthanum zirconate(La_(2)Zr_(2)O_(7))has the advantages of high melting point,structural stability at high temperatures,low thermal conductivity and excellent thermal insulation performance,making it an excellent candidate material for the next generation of TBCs.However,there are still two key issues in practical applications,namely low thermal expansion coefficient and poor fracture toughness.Consequently,La_(2)Zr_(2)O_(7) materials during service may experience localized thermal stress concentration due to thermal mismatch,leading to premature peeling and failure of the coating and seriously affecting the service life of the coating.Domestic and foreign researches have shown that modification of La_(2)Zr_(2)O_(7) materials can effectively solve the above problems.Therefore,this article systematically analyzed the researches on the modification of La_(2)Zr_(2)O_(7) materials,and summarized them into four categories:second-phase composite,rare earth doping,nanoization and high-entropy.The article focused on the impact and toughening mechanism of the four different modification methods on the thermal conductivity and thermal expansion coefficient of La_(2)Zr_(2)O_(7) materials.Furthermore,the research works on La_(2)Zr_(2)O_(7) material modification were summarized and prospected,which could provide the theoretical support for the application of La_(2)Zr_(2)O_(7) material in the field of thermal barrier coatings.

关 键 词：La_(2)Zr_(2)O_(7) 热物理性能 断裂韧性 纳米结构 高熵 

分 类 号：TG174[金属学及工艺—金属表面处理]