Preprint Article Version 1 This version not peer reviewed

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

Version 1 : Received: 1 October 2017 / Approved: 2 October 2017 / Online: 2 October 2017 (09:07:32 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Sensors 2017, 17, 2740
DOI: 10.3390/s17122740

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 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.

Subject Areas

ultrasonic transducers; high temperature measurement; nondestructive testing; thin film sensor; sol-gel composite

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