Ultrasonic Inspection of Thin Coatings Using Surface Waves

9812820 Harris薄膜或涂层用作热障以增加发动机部件制造中的硬度。重要的是要开发出无损检测这种涂层的方法，以在零件投入使用之前评估其质量。解析表达式描述的时间延迟，和传输损耗或衰减的超声波所造成的减薄，剥落，或开裂的涂层。表面波是特别有用的，因为它们比从涂层表面反射的波采样更大体积的涂层，并提供更强的接收信号。这项工作是与卡特彼勒公司合作完成的。 ***

9812820 Harris Thin films or coatings are used as thermal barriers to increase hardness in the manufacture of engine parts. It is important to develop ways to nondestructively inspect such coatings to assess their quality before a part is placed in service. Analytical expressions that describe the time delay, and transmission loss or attenuation of ultrasonic waves caused by thinning, flaking, or cracking of the coatings are developed. Surface waves are especially useful as they sample a larger volume of the coating than do waves reflected from coated surface and provide stronger received signal. The work is done in collaboration with Caterpillar Corporation. ***