The electro-acoustic output behavior and thermal stability of 1-3 piezoelectric composite transducers applied to FUS surgery

摘要

For 1-3 piezoelectric composite high-power transducers applied to FUS surgery, avoiding the electro-acoustic output performance fluctuating with the temperature is an important task. In this work, 1-3 type piezocomposites were fabricated with dice and fill method. The PZT4 piezoceramic was used as active phase, and mica powder modified epoxy resin E51 was used as passive phase: the mass ratio of the epoxy and mica powder was 10:x. Those composites were evaluated for power transducer applications with air backing and without front layer. The effect of mica powder modified polymer filler on the electro-acoustic output behavior and thermal stability of the transducer were detailed investigated. The results show that mica power could increase the storage modulus and the toughness of the polymer. As a result, an elevated k_t of 0.7 was observed when the adding amount was 50 wt%. The electro-acoustic conversion efficiency (η_(ea)) of the transducer substantial increased to 81-83% and with good thermal stability when x= 1-5. The research results show that adding mica powder in the filler materials was one of the potential methods to prepare high-power piezocomposite transducer.