High Temperature Durability Improvement of PbTiO3/ Pb(Zr,Ti)O3 Ultrasonic Transducers

In ultrasonic transducers, there is a problem that the couplant to match the acoustic impedance and the backing material to absorb unnecessary vibration have low durability at high temperature. We have developed an ultrasonic transducer that does not require a couplant or backing material by using a sol-gel composite method. Although the Curie temperature of PT is around 490°C, when the poling voltage and the polarity of the applied electric field during measurement are matched, high temperature durability is achieved and clear ultrasonic waveforms can be measured even at 600°C. The polarity of the poling voltage and the applied electric field during measurement was matched.