Abstract
New sol-gel composite made by CaBi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> Ti <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">15</sub> (CBT) piezoelectric powder and lead zirconate titanate (PZT) sol-gel was investigated for high temperature ultrasonic transducer applications. CBT was chosen because of relatively high Curie temperature, ~790°C. PZT sol-gel was chosen because of high dielectric constant. In order to investigate high temperature performance of CBT/PZT, CBT/PZT films were fabricated onto the metal plate substrates and then the reflected echoes from the substrate were monitored from room temperature up to 550°C. The signal strength was compared with bismuth titanate (BIT)/PZT and PZT/PZT. As a result, the echoes were confirmed from CBT/PZT and BIT/PZT samples at 550°C.
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