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在高温腐蚀领域,声发射技术是一种最有效且具有极高灵敏度的监测氧化膜破裂的技术.通过分析声发射计数,可以判断氧化膜首次发生破裂的时间及最后破裂的程度.如对声发射频谱进行分析,则可以判别氧化膜内发生塑性变形、开裂及剥落的过程.利用声发射技术还可以测量氧化膜/合金界面处预存物理缺陷大小及分布.此外,将声发射技术与其它技术结合,可建立全新的分析测试系统.综述了声发射技术用于监测氧化膜破裂的原理和方法,以及多种性能测试方面的应用与新发展.
In the field of high temperature corrosion, acoustic emission technology is one of the most effective and highly sensitive techniques for monitoring the breakdown of oxide films. By analyzing the acoustic emission count, the time of the first rupture of the oxide film and the extent of the final rupture can be judged. Such as acoustic emission spectrum analysis, you can determine the occurrence of plastic deformation within the oxide film, cracking and spalling process. The use of acoustic emission techniques can also measure the size and distribution of pre-existing physical defects at the oxide film / alloy interface. In addition, combining acoustic emission technology with other technologies enables the establishment of a completely new analytical test system. The principle and method of acoustic emission technique used to monitor the rupture of oxide film and the application and development of various performance testing are summarized.