文献类型：期刊文献

英文题名：Brazing Coupling Performance of Piezoelectric Waveguide Transducers for the Monitoring of High Temperature Components

作者：Jia, Jiu Hong[1];Wang, Ze Hou[1];Yao, Dai Feng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2021

卷号：21

期号：1

起止页码：1

外文期刊名：SENSORS

收录：;EI(收录号：20210209739599);WOS:【SCI-EXPANDED(收录号:WOS:000606666800001)】；

基金：This work was supported by the Shanghai Natural Science Foundation [No. 18ZR1408800].

语种：英文

外文关键词：brazing coupling; piezoelectric waveguide transducers; high temperature; structural health monitoring

摘要：Piezoelectric waveguide transducers possess great potential for the online monitoring of high temperature critical components, in order to improve their operational safety. Due to the use of a waveguide bar, the sensory device is not susceptible to high temperature environments, which enables the long-term service of the piezoelectric transducers. However, the coupling between the waveguide bar and the high-temperature component has been proven to be the most important part of the monitoring system. In order to effectively transmit waves through the junction of the waveguide bar and the monitoring target, it is necessary to research a reliable coupling method to connect the waveguide transducers with the host structure. In the present research, the feasibility of brazing coupling for wave propagation through the junction was investigated through experiments. Piezoelectric waveguide transducers were welded using various kinds of brazing filler metals. The experimental results indicate that the coupling effects of the brazing welding depend on the filler metals. At the same time, some filler metals for the effective coupling of the transducer and the target monitoring component were identified. The brazing coupling method was verified that it can non-dispersively and effectively propagate waves into the host structure with much better reliability than the conventional dry coupling approach. Moreover, the high-temperature experimental results show that the brazing-coupled waveguide bar system can work reliably and stably in high temperatures at 300 degrees C for a long time. This work strives to pave a solid foundation for the application of piezoelectric waveguide transducers for the structural health monitoring of high temperature critical components.