采用等离子喷涂工艺在TiAl合金表面制备常规和纳米ZrO2-7%Y2O3(质量分数)热障涂层,分析了两种涂层的组织结构,并对其隔热性能进行了比较。结果表明,等离子喷涂常规热障涂层呈典型的层状堆积特征,而纳米涂层为特殊的两相结构。相对于常规涂层,纳米涂层有较好的隔热性能;在1100℃时,等离子喷涂常规及纳米涂层的隔热温度分别为83、127℃。 Conventional and nanostructured ZrO2-7% Y2O3 (mass fraction) thermal barrier coatings were prepared on the surface of TiAl alloy by plasma spraying. The microstructures of the two coatings were analyzed and their thermal insulation properties were compared. The results show that the conventional thermal barrier coatings by plasma spraying have a typical lamellar stacking characteristic, while the nano-coating has a special two-phase structure. Compared with the conventional coating, the nano-coating has better thermal insulation properties; at 1100 ℃, the plasma spraying conventional and nano-coating insulation temperature were 83,127 ℃.