文献类型：期刊文献

英文题名：Acoustic stability and self-healing mechanism of nano-Ag coupled transducer for long-term high-temperature monitoring

作者：Gu, Yiqing[1];Feng, Yue[1];Jia, Jiuhong[1];Tu, Shan-Tung[1]

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

年份：2025

卷号：235

外文期刊名：APPLIED ACOUSTICS

收录：;EI(收录号：20251118022978);WOS:【SCI-EXPANDED(收录号:WOS:001443670100001)】；

基金：Acknowledgments The authors are grateful to the National Natural Science Foundation of China (Grant No. 52175138) for the financial support of this work

语种：英文

外文关键词：Acoustic performance; High-temperature ultrasonic transducer; (HTUT); Nano-Ag coupling layer; Structural Health Monitoring (SHM)

摘要：Ultrasonic transducers play a critical role in structural health monitoring, particularly in high-temperature environments. In this work, nano-Ag coupled transducer is tested through insulation, cooling, and reheating stages to assess the acoustic performance and investigate underlying mechanisms. The results show that the stability of the resonance frequency indicated that its core acoustic properties are not significantly affected after operating at 350 degrees C for 60 h. Long-term high-temperature operation indicated a decline in SNR due to Kirkendall voids from non-equilibrium diffusion. Increases in the mechanical coupling coefficient and quality factor suggest a selfhealing mechanism facilitated by grain boundary migration and atomic diffusion. Waveform distortions arose from thermal stress and mismatched thermal expansion coefficients in reheating.