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Sensors 2017, 17(12), 2740; doi:10.3390/s17122740

Mn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures

1
Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
2
Department of Electrical Engineering, Tokyo University of Science, Tokyo 162-0825, Japan
*
Author to whom correspondence should be addressed.
Received: 1 November 2017 / Revised: 16 November 2017 / Accepted: 24 November 2017 / Published: 27 November 2017
(This article belongs to the Special Issue Materials and Applications for Sensors and Transducers)
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Abstract

Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of a CaBi4Ti4O15(CBT)/Pb(Zr,Ti)O3(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has a high Curie temperature. To verify the high temperature durability, CBT/PZT sol-gel composite films were fabricated on titanium substrates by spray coating, and the CBT/PZT samples were tested in a furnace at various temperatures. Reflected echoes with a high signal-to-noise ratio were observed up to 600 °C. A thermal cycle test was conducted from room temperature to 600 °C, and no significant deterioration was found after the second thermal cycle. To investigate the long-term high-temperature durability, a CBT/PZT ultrasonic transducer was tested in the furnace at 600 °C for 36 h. Ultrasonic responses were recorded every 3 h, and the sensitivity and signal-to-noise ratio were stable throughout the experiment. View Full-Text
Keywords: ultrasonic transducers; high temperature measurement; nondestructive testing; thin film sensor ultrasonic transducers; high temperature measurement; nondestructive testing; thin film sensor
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Kobayashi, M.; Kibe, T.; Nagata, H. Mn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures. Sensors 2017, 17, 2740.

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