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首页> 外文期刊>Nondestructive Testing and Evaluation >Effectiveness of phased array focused ultrasound and active infrared thermography methods as a nondestructive testing of Ni-WC coating adhesion
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Effectiveness of phased array focused ultrasound and active infrared thermography methods as a nondestructive testing of Ni-WC coating adhesion

机译：相控阵聚焦超声波和活性红外热成像方法的有效性作为Ni-WC涂层粘附的无损检测

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摘要

The substrate/coating adhesion is a crucial parameter conditioning the quality of coating and its durability in service. For this reason, an inspection of the coating integrity, in particular, the presence of adhesion defects will be of great importance. The adhesion inspection is usually ensured by destructive methods, such as traction, interfacial indentation, four-point bending, testing scratch, etc. However, it is currently hampered by the absence of a satisfactory non-destructive method. Among the non-destructive testing technologies widely used in the industrial field, there are X-ray diffraction, ultrasonic inspection, and infrared thermography. In this paper, two methods are investigated: ultrasonic inspection, which becoming more efficient, especially with the emergence of phased array systems that allow to investigate different inspection angles and focusing depths, and the active infrared thermography. Experiments were performed on metallic coatings deposited on a mild steel substrate. Coatings were containing artificial defects (flat bottom holes with different diameters) at the interface and others were exempts of defects. Longitudinal waves with specific delay laws were generated through a phased array contact transducer (5 MHz of central frequency). Experimental results show that the ultrasonic method allows detecting and sizing defects with a diameter of 1 mm located in thick coatings.
机译：基板/涂层粘附是一种关键的参数调节涂层质量及其在服务中的耐用性。因此，特别是对涂层完整性的检查，粘附缺陷的存在将是非常重要的。粘附检查通常通过破坏性方法确保，例如牵引，界面压痕，四点弯曲，测试划痕等。然而，由于没有令人满意的非破坏性方法，它目前被阻碍。在工业领域广泛使用的非破坏性测试技术中，有X射线衍射，超声波检查和红外热成像。在本文中，研究了两种方法：超声波检查，其变得更有效，特别是在允许调查不同的检查角度和聚焦深度和活性红外热成像的分阶段阵列系统的出现。在沉积在低碳钢基材上的金属涂层上进行实验。涂层在界面上含有人工缺陷（具有不同直径的平底孔），其他缺陷是免除缺陷。通过相位阵列接触换能器（中央频率为5MHz）产生具有特定延迟定律的纵波。实验结果表明，超声波方法允许在厚涂层中检测和施加直径1mm的缺陷。

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