目的 研究粘结层真空退火处理对热障涂层热循环条件下服役性能的影响。方法 在某二代镍基单晶高温合金上涂覆铂铝粘结层，然后采用电子束物理气相沉积法沉积氧化钇稳定的氧化锆陶瓷层，构建热障涂层体系，在1100 ℃下可自动升降的循环氧化炉中进行热循环测试，通过高精度电子天平对涂层样品进行称量并绘制质量变化曲线，采用拍摄宏观照片的方式观察样品表面陶瓷层剥落情况，利用扫描电子显微镜观察沉积态及热循环后的样品截面微观组织结构形貌。结果 与沉积态粘结层相比，在高真空中进行退火处理后，热障涂层的热循环寿命几乎增加一倍，且陶瓷层与热生长氧化膜结合良好。未经过真空处理的铂铝涂层表面陶瓷层发生明显剥落，且热生长氧化膜质量较差，出现了明显裂纹。结论 真空退火处理可使铂铝涂层表面更加平整，在高温氧化过程中生成的低缺陷氧化膜有更好的质量，陶瓷层与粘结层的结合力更强，热障涂层体系的服役性能和寿命得到有效提升。

The work aims to investigate the influence of bond-coat vacuum-annealing treatment on the service performance of thermal barrier coating under thermal cycle. Pt-modified nickel aluminide (PtAl) bond-coat by vapor phase aluminizing (VPA) and yttria stabilized zirconia (YSZ) top-coat by electron beam vapor physical deposition (EB-PVD) were sequentially deposited to a second-generation Ni-base superalloy to construct a thermal barrier coating system. The thermal cycle test was carried out in a cycling oxidation furnace which could automatically rise and fall at 1100 ℃. Net weight of the coating samples was measured by a high accuracy electronic balance and the mass change curves were drawn. Spallation tendency of ceramic topcoat was observed by macroscopic photographing. A field-emission scanning electron microscope was utilized to observe the cross-sectional morphology of coating samples in the as-received and thermally-cycled states. Compared with TBCs without pre-annealing treatment under vacuum, the oxidation resistance and thermal cycling performance of the annealed TBC samples were greatly increased, resulting in a doubled lifetime in the cyclic oxidation test and ceramic topcoat was well combined with the thermally grown oxide film. The ceramic topcoat on the surface of platinum-aluminum coating without pre-annealing treatment under vacuum had obvious spallation, and the quality of thermally grown oxide film was poor, resulting in obvious cracks. Notable spallation of ceramic topcoat occurred on the surface of normal TBC samples. Vacuum annealing treatment can make the surface of the platinum-aluminum coating smoother, the low-defect oxide film generated in the high-temperature oxidation process has better quality, the bonding force between the ceramic topcoat and the bond coating is stronger, and the service performance and service life of the thermal barrier coating system are effectively improved.