In situ monitoring of microfracture during plasma spray coating by laser AE technique
In situ monitoring of microfracture during plasma spray coating by laser AE technique
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DOI：
10.1016/j.stam.2003.12.011
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发表时间：
2003-01-01
影响因子：
5.5
通讯作者：
Tomita, K.
中科院分区：
文献类型：
--
作者：
Nishinoiri, S.;Enoki, M.;Tomita, K.
大气等离子喷涂陶瓷涂层对涂层的可靠性要求很高，但涂层材料在喷涂过程中存在大量的气孔和扁平颗粒形成的层状边界。这些边界成为微裂纹和随后裂纹生长的起源。喷涂工艺参数对涂层的组织和强度有很大的影响，因此建立涂层过程的在线监测技术是一项非常有意义的工作。然而，有一个限制，以应用现有的无损评价技术，在高温下的实时监测。我们研究了一种非接触式测量系统，以检测由于微裂纹声发射（AE）信号，使用激光干涉仪，并应用此技术了解陶瓷涂层在高温下的微断裂过程。本文采用非接触式激光声发射技术，通过检测喷涂过程中的声发射信号，研究了几种喷涂工艺参数对微裂纹萌生和扩展过程的影响。(C)2004爱思唯尔有限公司保留所有权利。
Atmosphere plasma spray coating materials include many pores and lamellar boundaries formed by flattened particles during spraying process although high reliability are required in ceramic coatings for turbines. These boundaries become an origin of the microcracks and following crack growth. As it is known that spraying parameters strongly affect the microstructure and strength of coating, it is expected to establish in situ monitoring technique for coating process. However, there is a limit to apply the existing non-destructive evaluation techniques to real-time monitoring at elevated temperature. We have investigated a non-contact measuring system to detect acoustic emission (AE) signals due to microfractures using a laser interferometer, and applied this technique for understanding microfracture process of ceramic coating at elevated temperature. In this paper, we evaluated the effect of several spraying parameters on the initiation and growth process of microcrack by detecting AE signals during coating process using a non-contact laser AE technique. (C) 2004 Elsevier Ltd. All rights reserved.