The two-layer structured YSZ/NiCrAlY coatings were modified with dot shape by laser remelting. The microstructure, phase composition and thermal cycling behaviors of the as-sprayed and laser-treated coatings with different laser dot distances were investigated. The thermal cycling behaviors of the as-sprayed and laser-treated coatings were studied systematically at 1000 °C. The results indicated that the coating with 3 mm distance between the laser-treated zone, namely the dot distance, showed the longest thermal cycling lifetimes, which was approximately 2.5 times as much as that of the as-sprayed coating. For one thing, the columnar grains and segmented cracks in the dot units were beneficial for accommodating the thermal stresses of coatings during thermal cycling. For another, a certain number of microcracks in the dot units could release the driving force for crack propagation, namely the elastic energy.

通过激光重熔将两层结构的YSZ / NiCrAlY涂层改性为点状。研究了不同激光点距的喷涂和激光处理涂层的微观结构，相组成和热循环行为。系统地研究了喷涂和激光处理的涂层在1000°C下的热循环行为。结果表明，在激光处理区域之间的距离为3 mm的涂层（即点距）显示出最长的热循环寿命，约为喷涂后涂层的2.5倍。一方面，点状单元中的柱状晶粒和分段裂纹有利于适应热循环过程中涂层的热应力。为别人，