The ultrasonic transducer is the core device of ultrasonic nondestructive testing system. As an important component of the ultrasonic transducer, the matching layer can reduce the acoustic energy loss caused by the mismatch of low impedance and improve the energy transmission efficiency of the transducer.The traditional ultrasonic transducer failure is caused mostly by the chemical bond fracture of organic materials of matching layers, which affects the accuracy of detection. In order to develop high performance radiation-resistant ultrasonic transducers, the matching layers were made by mixing good radiation resistance bisphenol A epoxy resin with different content Al2O3 particles (0%~80%). The changes of appearance, density, sound velocity, acoustic impedance and attenuation of the matching layers were investigated under different γ-ray irradiation from 0 to 1000 kGy. With the increase of radiation dose, the color of the sample gradually was deepened, and the density almost remained unchanged. The sound velocity, acoustic impedance and acoustic attenuation are slightly increased. In addition, based on the above matching layer, an ultrasonic transducer with a central frequency of 9MHz has been fabricated, the signal of the transducer almost remain unchanged after irradiation, indicating that matching layers can maintain good acoustic performance under large dose irradiation, which may have a great application potential in the design of γ-radiation resistant ultrasonic transducer. |