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