title: 1-3 connectivity composite material made from lithium niobate and cement for ultrasonic condition monitoring at elevated temperatures.
abstract: 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.
authors.affiliation: BAE Systems, South Gyle Crescent, Edinburgh, UK.
authors.forename: G
authors.initials: G
authors.lastname: Shepherd
authors.forename: A
authors.initials: A
authors.lastname: Cochran
authors.forename: K J
authors.initials: KJ
authors.lastname: Kirk
authors.forename: A
authors.initials: A
authors.lastname: McNab