Kirk, K.J., Schmarje, N. and Cochran, S. (2004) Lithium niobate piezocomposite phased arrays operating at high temperatures. Insight: The Journal of the British Institute of Non-destructive Testing, 46(11), pp. 662-665. (doi: 10.1784/insi.46.11.662.52284)
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Abstract
Phased arrays made from high-temperature-resistant piezocomposite have been investigated for non-destructive testing. The piezocomposite material was made from lithium niobate in the 1–3 connectivity (pillar) configuration, manufactured by the dice-and-fill method using high-temperature cement as the passive matrix. Lithium niobate piezocomposites were used in ultrasonic measurements at high temperatures. In transmit/receive tests on a steel test block, clear back-wall echoes were seen at temperatures up to 500°C and the piezocomposite material remained operational after returning to room temperature. In phased array tests using an RD Tech array controller, an eight-element lithium niobate piezocomposite array with element width 1 mm and inter-element spacing 1.5 mm was able to detect a side-drilled hole representing a defect at 300°C. Lithium niobate is an important piezoelectric material for high-temperature ultrasonic applications since it is cheap and widely available and has a very high Curie temperature of 1210°C. The benefits of using piezocomposite rather than single-crystal plates of lithium niobate were increased robustness of the active material under thermal cycling, reduced lateral modes, and increased electromechanical coupling coefficient, kt.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Cochran, Professor Sandy |
Authors: | Kirk, K.J., Schmarje, N., and Cochran, S. |
College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
Journal Name: | Insight: The Journal of the British Institute of Non-destructive Testing |
Publisher: | British Institute of Non-Destructive Testing |
ISSN: | 1354-2575 |
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