Measurement and control of temperature characteristics of piezoelectric composites

Type 1-3 piezoelectric composite vibrators are commonly used in hydroacoustic detection, nondestructive flaw detection and medical ultrasound due to their high electromechanical characteristics and high stability. The temperature stability of piezoelectric composites is one of the key issues in the design of piezoelectric composites due to the large difference in the temperature characteristics of the polymer and piezoelectric ceramic phases, and the research on the testing method of the temperature deformation of piezoelectric composite oscillators can provide a reliable basis for the screening of piezoelectric composite oscillators for transducers, and promote the improvement of the piezoelectric composite oscillator design and preparation process, which has great significance for the performance enhancement of the transducer and the sonar system. It is of great significance for the improvement of transducer and sonar system performance. In this paper, the temperature characteristics of six piezoelectric composites with different polymer phases are compared, and the results show that the 9110B and 9110W silicone piezoelectric composites have better temperature stability. The relative change in frequency constant of 9110B silicone piezoelectric composite is 0.12 and the relative change in dielectric constant is 2.29 under the variable temperature environment from 25℃ to 120℃.