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Brazing Strategies for High Temperature Ultrasonic Transducers Based on LiNbO3 Piezoelectric Elements

1
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8, Canada
2
Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada
*
Author to whom correspondence should be addressed.
Instruments 2019, 3(1), 2; https://doi.org/10.3390/instruments3010002
Received: 30 November 2018 / Revised: 19 December 2018 / Accepted: 20 December 2018 / Published: 23 December 2018
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Abstract

Long-term installation of ultrasonic transducers in high temperature environments allows for continuous monitoring of critical components and processes without the need to halt industrial operations. Transducer designs based on the high-Curie-point piezoelectric material lithium niobate have been shown to both be effective and stable at extreme temperatures for long-term installation. In this study, several brazing techniques are evaluated, all of which aim to provide both mechanical bonding and acoustic coupling directly to a bare lithium niobate piezoelectric element. Two brazing materials—a novel silver-copper braze applied in a reactive air environment and an aluminum-based braze applied in a vacuum environment—are found to be suitable for ultrasound transmission at elevated temperatures. Reliable wide-bandwidth and low-noise ultrasound transmission is achieved between room temperature and 800 °C. View Full-Text
Keywords: lithium niobate; brazing; ultrasonic transducer; high temperature; piezoelectric lithium niobate; brazing; ultrasonic transducer; high temperature; piezoelectric
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MDPI and ACS Style

Bosyj, C.; Bhadwal, N.; Coyle, T.; Sinclair, A. Brazing Strategies for High Temperature Ultrasonic Transducers Based on LiNbO3 Piezoelectric Elements. Instruments 2019, 3, 2.

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