Evaluation of fracture toughness and residual stress for both single GYbZ and double layered GYbZ/8YSZ coatings by modified indentation tests
Evaluation of fracture toughness and residual stress for both single GYbZ and double layered GYbZ/8YSZ coatings by modified indentation tests
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通过改进的压痕测试评估单层 GYbZ 和双层 GYbZ/8YSZ 涂层的断裂韧性和残余应力
DOI：
10.1016/j.surfcoat.2020.125723
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发表时间：
2020
影响因子：
5.4
通讯作者：
Fang Daining
中科院分区：
文献类型：
--
作者：
Mao Weiguo;Zhang Hongjing;Zhang Zhouqing;Xiong Jiayi;Huang Huiyu;Wang Yuncheng;Lv Liang;Feng Biao;Pan Junan;Dai Cuiying;Fang Daining
采用超音速等离子喷涂技术制备了单层(Gd0.9Yb0.1)2Zr2O7(GYbZ)和双层GYbZ/Yttria部分稳定氧化锆涂层。利用扫描电子显微镜和X射线衍射仪对两种涂层的组织和织构进行了分析。在压痕试验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。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，随着压痕点逐渐向界面移动，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。研究结果将有助于理解先进陶瓷涂层的设计优化和失效机理。
Single (Gd0.9Yb0.1)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.