1-3 connectivity composite material made from lithium niobate and cement for ultrasonic monitoring at elevated temperatures

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Shepherd, G. and Cochran, A. and Kirk, K.J. and McNab, A. (2002) 1-3 connectivity composite material made from lithium niobate and cement for ultrasonic monitoring at elevated temperatures. Ultrasonics, 40 (1). pp. 223-226. ISSN 0041-624X (http://dx.doi.org/10.1016/S0041-624X(02)00141-5)

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Abstract

We have designed, manufactured and tested a piezoelectric composite material to operate at temperatures above 400 oC. The material is a 1-3 connectivity composite with pillars of Z-cut lithium niobate in a matrix of alumina cement. The composite material produced shorter pulses than a monolithic plate of lithium niobate and remained intact upon cooling. Results are presented from room temperature and high temperature testing. This material could be bonded permanently to a test object, making it possible to carry out condition monitoring over an extended period. A new excitation method was also developed to enable remote switching between array elements.

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