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首页> 美国卫生研究院文献>Science and Technology of Advanced Materials >Detection of segmentation cracks in top coat of thermal barrier coatings during plasma spraying by non-contact acoustic emission method
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Detection of segmentation cracks in top coat of thermal barrier coatings during plasma spraying by non-contact acoustic emission method

机译：非接触声发射法检测等离子喷涂过程中热障涂层面层的开裂

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摘要

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.
机译：在通过大气等离子喷涂（APS）方法沉积的热障涂层（TBC）的面漆中可以观察到许多裂纹。这些裂缝可分为垂直裂缝和水平裂缝，它们对TBC的性能有相反的影响。垂直裂纹减少了面漆中的残余应力并提供了应变容差。相反，水平裂缝会引发面漆分层。然而，即使强烈希望在APS期间监测裂纹产生的方法也很少。因此，在本研究中，通过使用激光干涉仪作为传感器，利用激光声发射（AE）技术开发了一种针对该目标的原位，非接触，无损评估方法。通过引入改进的降噪滤波器和具有多个阈值的AE事件检测过程，可以检测到更多AE事件。垂直裂纹的产生已通过新引入的等离子炬扫描模式成功地与水平裂纹分离。因此，通过一种监测方法可以确定地检测到垂直裂纹的产生，因为在一个实验中仅在喷涂过程中检测到AE事件，并且在垂直裂纹的发展程度与总AE能量之间观察到正相关。

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