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首页> 外文期刊>DVS-Berichte >Failure behavior of the plasma-sprayed yttria stabilized zirconia thermal barrier coatings under the three point bending test via acoustic emission technique
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Failure behavior of the plasma-sprayed yttria stabilized zirconia thermal barrier coatings under the three point bending test via acoustic emission technique

机译：等离子喷涂氧化钇稳定的氧化锆热障涂层在通过声发射技术进行的三点弯曲试验下的失效行为

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摘要

In this paper, the failure behavior of plasma-sprayed yttria stabilized zirconia thermal barrier coatings fabricated by atmospheric plasma spraying(APS-TBCs) under three-point bending (3PB) has been characterized via acoustic emission (AE) technique. Linear Position Sensing (LPS) method has been adopted to monitor dynamic failure process of the APS-TBCs under 3PB. The investigation results indicate that the variation of AE parameters (ring down counts, amplitudes and cumulative energy) correspond well with the change of stress-strain curve of the loading processes. The failure mechanism can be analyzed systematically based on the characteristics of AE parameters. The distribution of frequency of crack propagation has been revealed. The AE signals came from plastic deformation of substrates and cracking of coatings. The different types of cracks and modes of cracks propagation have been distinguished. LPS method has indicated that many segmentation cracks initiate at the inner of the top-coat. And some main cracks tend to propagate toward the interface. The actual failure mechanism of the APS-TBCs under 3PB results from debonding of ceramic coating from the substrates and then horizontal crack propagate along the bond-coat/top-coat interface under action of flexural moment. The additional digital image technique (DIC) has been used and further testified variation of deformation process of the APS-TBCs.
机译：本文通过声发射（AE）技术对通过大气等离子喷涂（APS-TBCs）制备的等离子喷涂氧化钇稳定氧化锆热障涂层在三点弯曲（3PB）下的失效行为进行了表征。线性位置传感（LPS）方法已被用来监视3PB下APS-TBC的动态故障过程。研究结果表明，声发射参数的变化（振铃计数，振幅和累积能量）与加载过程的应力-应变曲线的变化非常吻合。可以根据AE参数的特征对故障机理进行系统分析。揭示了裂纹扩展频率的分布。 AE信号来自基材的塑性变形和涂层的开裂。区分了不同类型的裂纹和裂纹扩展方式。 LPS方法已表明，在面漆的内部会产生许多分割裂纹。而且一些主要的裂纹倾向于向界面传播。在3PB下APS-TBC的实际破坏机理是由于陶瓷涂层从基体上脱粘，然后在挠曲力矩的作用下，水平裂纹沿结合层/面层界面传播。已经使用了附加的数字图像技术（DIC），并进一步证明了APS-TBC变形过程的变化。

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