【摘 要】
：
发展先进的无损测试方法及仪器实时表征涂层/薄膜体系失效过程及破坏机理对于提高其服役寿命和可靠性具有重要的意义.通过结合数字图像相关法(Digital image correlation)和
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发展先进的无损测试方法及仪器实时表征涂层/薄膜体系失效过程及破坏机理对于提高其服役寿命和可靠性具有重要的意义.通过结合数字图像相关法(Digital image correlation)和声发射(Acoustic emission)技术,以等离子喷涂法制备的热障涂层体系为例,在简单载荷作用下对其进行相应的破坏实验,实现对其破坏过程进行了实时无损监测和数据采集.经过建立力学模型,分析声发射信号波形和数字图像相关法变形测试结果,进一步掌握了拉伸载荷作用下热障涂层界面破坏机制.另外,采用自主研制的数字图像显微小负荷维氏压痕仪,对热循环处理前后的热障涂层试样表面、侧面与界面三个位置处的涂层进行压痕测试表征,并分别引入相关力学模型得到了不同位置处涂层的断裂韧性和相应残余应力等力学参数.结果表明:热障涂层表面断裂韧性值为0.64 ～ 3.67 MPa m1/2,被测区域内表面残余应力值为–30 ～ –243 MPa;涂层界面断裂韧性是0.19 ～ 0.82 MPa m1/2,相应的残余应力为–5 ～ –30 MPa;涂层侧面断裂韧性是0.2 ～ 1.4 MPa m1/2,相应的残余应力为–20 ～ –150 MPa.我们的测试结果分别与X衍射测试残余应力、弯曲法测试断裂韧性的结果基本一致.
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