1-3 connectivity composite material made from lithium niobate and cement for ultrasonic condition monitoring at elevated temperatures.
We have designed, manufactured and tested a piezoelectric composite material to operate at temperatures above 400 degrees C. 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.
Shepherd
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G
BAE Systems, South Gyle Crescent, Edinburgh, UK.
Cochran
A
A
Kirk
K J
KJ
McNab
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A