Temperature dependence of a propagation speed of longitudinal waves in different solids for use as a wedge material in an extreme-temperature-resistant ultrasonic transducer
* Presenting author
In special cases of an angle beam ultrasonic testing – i. e. defect detection on hot objects as well as flow measurement of liquid gases or energy storage mediums – the applied transducer has to withstand extreme temperatures. Since the irradiation angle is determined not only by a wedge design, but also by a sound speed in both the wedge material and tested object, the developer must take into account the speed of wave propagation in a wedge material over the whole temperature range of transducers application.In this study we investigate the temperature dependence of speed of longitudinal wave propagation in 10 different materials in the range from -200 to 400 °C. The investigated materials belong to different material classes (ceramics, glass, as well as ferrous and non-ferrous alloys) and are all temperature-resistant in the atmosphere up to at least 600 °C, and therefore can be used as a wedge in an ultrasonic transducer for use at extreme temperatures.