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High-temperature (>500/spl deg C) ultrasonic transducers: an experimental comparison among three candidate piezoelectric materials

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3 Author(s)
Parks, D.A. ; Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA, USA ; Shujun Zhang ; Tittmann, B.R.

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.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:60 ,  Issue: 5 )