耐高温性を持つ直接塗布型ゾルゲル複合体圧電デバイスの高温疲労試験

抄録

In this paper, high-temperature-resistant ultrasonic transducers for nondestructive inspection of chemical plants and power plants were fabricated. And the transducers were tested for high-temperature fatigue. Nondestructive pipe wall thickness measurements are typically conducted as piezoelectric ultrasonic transducers with acoustic bonding material like couplant material and backing material. However, the heat resistance of the couplant material and backing material cannot withstand nondestructive thickness measurement of piping in high-temperature environments. Therefore, in this method, piezoelectric devices were directly fabricated to the piping by applying piezoelectric ceramics with high temperature resistance and flexibility. The abilities are generated by a porous constitution of the film using a sol-gel composite spray coating method. The fatigue tests were conducted to the devices by repeatedly exposing them to 600°C. The devise could be available 6 times temperature increase and the decrease of ability acceptable. This paper describes sufficient availability of the so-gel composite piezoelectric film on high temperature environment.