In situ characterizations of mechanical behaviors of freestanding (Gd0.9Yb0.1)(2)Zr2O7 coatings by bending tests under different temperatures based on digital image correlation
In situ characterizations of mechanical behaviors of freestanding (Gd0.9Yb0.1)(2)Zr2O7 coatings by bending tests under different temperatures based on digital image correlation
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基于数字图像相关性的不同温度下弯曲试验对独立式 (Gd0.9Yb0.1)(2)Zr2O7 涂层力学行为的原位表征
DOI：
10.1016/j.jeurceramsoc.2019.07.031
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发表时间：
2020
影响因子：
5.7
通讯作者：
Fang Daining
中科院分区：
文献类型：
--
作者：
Mao Weiguo;Wang Yujie;Huang Huiyu;Zeng Li;Wang Yuncheng;Lv Liang;Feng Biao;Zou Chen;Dai Cuiying;Tang Qizhong;Fang Daining
研究Gd2Zr2O7陶瓷材料的高温力学性能及其失效机理对开发新型热障涂层具有重要意义。采用超音速等离子喷涂技术制备了(Gd0.9Yb0.1)2Zr2O7(GYbZ)自支撑涂层。利用改进的高温原位实验系统(高达15 0 0 °C)，结合数字图像相关技术，通过三点弯曲试验评价了GYbZ涂层的断裂强度和弯曲弹性系数，并通过单边缺口梁实验研究了涂层的断裂韧性。此外，通过上述实验数据，利用扩展有限元分析方法估算了GYbZ涂层的临界能量释放率。讨论了试验温度对自支承GYbZ涂层在弯曲载荷下的力学性能、开裂和断口形貌的影响。研究结果对了解多层GYbZ热障涂层的高温失效机理具有一定的参考价值。
It is important to investigate the high-temperature mechanical properties and failure mechanisms of Gd2Zr2O7ceramic materials for the development of novel thermal barrier coatings. Freestanding (Gd0.9Yb0.1)2Zr2O7(GYbZ) coatings were prepared by supersonic plasma sprayed technique. A modified high-temperature in situ experimental system (up to 1500 °C) with the aid of digital image correlation technique was used to evaluate the fracture strength and flexural modulus of GYbZ coatings using three-point bending tests, and the fracture toughness was studied by single edge notched beam experiments. In addition, the extended finite element analysis was used to estimate the critical energy release rate of GYbZ coatings through the aforementioned experimental data. The effect of test temperature on the mechanical properties, cracking and fracture morphology of freestanding GYbZ coatings was discussed under bending loads. The results are useful for understanding high-temperature failure mechanisms of multilayered GYbZ thermal barrier coatings.