Single (Gd_0.9Yb_0.1)₂Zr₂O₇ (GYbZ) and double layered GYbZ/yttria partially stabilized zirconia coatings were prepared with supersonic plasma sprayed technique. The microstructure and texture of the two coatings were analyzed by scanning electron microscope and X-ray diffraction. The elastic modulus, hardness, fracture toughness and residual stress of both coating systems were measured in indentation tests. The influence of residual stress on fracture toughness measurements was discussed with different indentation models. It is interesting to find that the absolute value of residual stress on the cross section of the coating becomes smaller, while the corresponding fracture toughness gets larger when the indented point gradually moves to the interface. The present results would be helpful for understanding the design optimization and failure mechanisms of advanced ceramic coatings.

单（Gd _0.9 Yb _0.1）₂ Zr ₂ O ₇（GYbZ）和双层GYbZ /氧化钇部分稳定的氧化锆涂层是采用超声等离子体喷涂技术制备的。通过扫描电子显微镜和X射线衍射分析两种涂层的微观结构和织构。在压痕测试中测量了两种涂层体系的弹性模量，硬度，断裂韧性和残余应力。使用不同的压痕模型讨论了残余应力对断裂韧性测量的影响。有趣的是，当切入点逐渐移至界面时，涂层横截面上的残余应力绝对值变小，而相应的断裂韧性变大。