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采用新研制的配有声发射检测装置的压入式试验机对超音速等离子喷涂的Al2O3陶瓷涂层和FeCrBSi合金涂层进行试验,研究了两种不同性质声发射反馈信号及其临界点的变化特点,以及涂层微观形貌。结果表明,涂层结合强度、涂层表面、界面压痕形貌与开裂程度及其声发射特征参量存在内在联系,表明对较厚的热喷涂涂层通过连续载荷的锥形压入,结合声发射监测技术是表征其结合强度的一种有效方法。
The newly developed Al2O3 ceramic coating and FeCrBSi alloy coating with supersonic plasma spraying were tested with a press-in testing machine equipped with AE detector. The characteristics of two different types of acoustic emission feedback signals and their critical points were studied , As well as the coating microstructure. The results show that the bonding strength, coating surface, interfacial indentation morphology and cracking degree and acoustic emission characteristic parameters are intrinsically linked, indicating that the thick thermal spray coating by continuous load conical press-in, combined with the sound Emission monitoring technique is an effective method to characterize the bonding strength.