Detection of segmentation cracks in top coat of thermal barrier coatings during plasma spraying by non-contact acoustic emission method.
Detection of segmentation cracks in top coat of thermal barrier coatings during plasma spraying by non-contact acoustic emission method.
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DOI：
10.1088/1468-6996/15/3/035007
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发表时间：
2014-06
影响因子：
5.5
通讯作者：
Enoki M
中科院分区：
文献类型：
--
作者：
Ito K;Kuriki H;Araki H;Kuroda S;Enoki M
采用大气等离子喷涂（APS）方法制备的热障涂层（TBCs）表面存在大量裂纹。这些裂纹可分为垂直裂纹和水平裂纹，它们对热障涂层的性能有相反的影响。垂直裂纹降低了顶涂层中的残余应力，并提供应变公差。相反，水平裂纹触发顶层的分层。然而，在APS过程中裂纹产生的监测方法是罕见的，即使他们是强烈希望。因此，在这项研究中，开发了一种原位，非接触和非破坏性的评价方法，这一目标与激光声发射（AE）技术，使用激光干涉仪作为传感器。通过引入改进的降噪滤波器和多阈值声发射事件检测方法，可以检测到更多的声发射事件。通过引入等离子体炬的扫描模式，成功地将垂直裂纹的产生与水平裂纹分离。因此，通过这种监测方法，可以确定地检测到垂直裂纹的产生，因为仅在喷涂期间检测到AE事件，并且在一个实验中观察到垂直裂纹的发展程度与总AE能量之间的正相关性。
Numerous cracks can be observed in the top coat of thermal barrier coatings (TBCs) deposited by the atmospheric plasma spraying (APS) method. These cracks can be classified into vertical and horizontal ones and they have opposite impact on the properties of TBCs. Vertical cracks reduce the residual stress in the top coat and provide strain tolerance. On the contrary, horizontal cracks trigger delamination of the top coat. However, monitoring methods of cracks generation during APS are rare even though they are strongly desired. Therefore, an in situ, non-contact and non-destructive evaluation method for this objective was developed in this study with the laser acoustic emission (AE) technique by using laser interferometers as a sensor. More AE events could be detected by introducing an improved noise reduction filter and AE event detection procedures with multiple thresholds. Generation of vertical cracks was successfully separated from horizontal cracks by a newly introduced scanning pattern of a plasma torch. Thus, generation of vertical cracks was detected with certainty by this monitoring method because AE events were detected only during spraying and a positive correlation was observed between the development degree of vertical cracks and the total AE energy in one experiment.
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DOI：
10.1016/j.msea.2004.06.053
发表时间：
2004-11-15
影响因子：
6.4
作者：
Gan, ZH;Ng, HW
通讯作者：
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影响因子：
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影响因子：
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影响因子：
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影响因子：
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作者：
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