Sandwich-Type Piezoelectric Composite Transducer for Efficient Heat Dissipation

Piezoelectric composites have been widely used in high-frequency transducers because of their good high-frequency vibration characteristics, high-electro- mechanical conversion efficiency, and large bandwidth. However, compared with piezoelectric ceramics, piezoelectric composites have the disadvantage of high loss, and this disadvantage leads to much heat generation under the excitation of high-power electrical signals. As a result, piezoelectric composite transducers often suffer from high internal temperatures during high-power operation, which in turn affects their acoustic performance. To address this problem, this article proposes a sandwich-type piezoelectric composite transducer structure that can dissipate heat efficiently and conducts theoretical, finite-element simulation, and experimental studies on it. The results show that the sandwich-type heat dissipation structure designed in this article can significantly reduce the internal temperature of the piezoelectric composite transducer, which provides a guarantee for the high-power operation of the piezoelectric composite transducer.