title: High-temperature (>500°C) ultrasonic transducers: an experimental comparison among three candidate piezoelectric materials.
abstract: High-temperature piezoelectric crystals, including YCa4O(BO3)3, LiNbO3, and AlN, have been studied for use in ultrasonic transducers under continuous operation for 55 h at 550°C. Additionally, thermal ratcheting tests were performed on the transducers by subjecting the crystals to heat treatments followed by ultrasonic performance testing at room temperature and 500°C. The changes resulting from the heat treatments were less than the statistical spread obtained in repeated experiments and were thus considered negligible. Finally, in situ measurements of the pulse-echo response of YCa4O(BO3)3 were performed at temperatures up to 950°C for the first time, showing stable characteristics up to these high temperatures.
authors: Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA, USA.
authors: David
authors: D
authors: Parks
authors: Shujun
authors: S
authors: Zhang
authors: Bernhard
authors: B
authors: Tittmann