Thermal barrier coatings (TBCs) typically have low thermal conductivity and high resistance to oxidation at elevated temperatures. TBCs are used to protect the turbine blades of aircraft engines operating at high temperature. The commonly used YSZ (8 wt% Y2O3-stabilized ZrO2) cannot function at temperatures higher than 1200°C for an extended period of time, which hinders the necessary improvement in the aircraft thrust-to-weight ratio. In this work, thermal barrier coatings consisting of a YSZ ceramic layer and of a lanthanum zirconate (LZ) + YSZ composite structure were prepared on a nickel-based high-temperature substrate using atmospheric plasma spraying. Thermal insulation properties and high temperature oxidation performance of TBCs with single layer structure and double layer structure were compared. The growth mechanism and influencing factors of high-temperature oxidation of thermally grown oxide (TGO) were discussed. The results showed that the LZ had good thermal insulation performance and oxygen isolation compared to the YSZ layer. This performance effectively reduces the growth of TGO in TBCs, thereby delaying the coating failure. GRAPHICAL ABSTRACT

中文翻译：

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锆酸镧对热障涂层耐高温性能的影响

热障涂层 (TBC) 在高温下通常具有低导热性和高抗氧化性。TBC 用于保护在高温下运行的飞机发动机的涡轮叶片。常用的 YSZ（8 wt% Y2O3 稳定的 ZrO2）不能在高于 1200°C 的温度下长时间发挥作用，这阻碍了飞机推重比的必要改进。在这项工作中，使用大气等离子喷涂在镍基高温基材上制备了由 YSZ 陶瓷层和锆酸镧 (LZ) + YSZ 复合结构组成的热障涂层。比较了单层结构和双层结构的TBCs的隔热性能和高温氧化性能。讨论了热生长氧化物（TGO）高温氧化的生长机理和影响因素。结果表明，与YSZ层相比，LZ具有良好的隔热性能和隔氧性能。这种性能有效地减少了 TBCs 中 TGO 的生长，从而延迟了涂层失效。图形概要