文献类型：期刊文献

英文题名：A novel coupling method for ultrasonic transducer based on pressureless sintering of nano-Ag

作者：Gu, Yiqing[1];Liao, Zuoyu[1];Gu, Mengqi[1];Li, Zhiwen[1];Jia, Jiuhong[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：2024

卷号：28

起止页码：2478

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20240115308101);WOS:【SCI-EXPANDED(收录号:WOS:001149974900001)】；

基金：The authors are grateful to the National Natural Science Foundation of China (Grant No. 52175138) for the financial support of this work. The first author is thankful to Professor Wenguang Nan, Nanjing Tech University, China, for the inspiration and encouragement on this work.

语种：英文

外文关键词：Coupling; Nano-Ag; Pressureless sintering; Structural health monitoring (SHM); Ultrasonic transducer

摘要：The acoustic performance of ultrasonic transducer is directly determined by the coupling between the piezoelectric unit and the medium. At present, the coupling methods of the transducer are relatively single. In this work, a novel ultrasonic transducer coupling method based on pressureless sintering of nano-Ag is reported. The effects of sintering temperature on the micro-morphology and macro-porosity of nano-Ag sintered bulk (i.e. demoulded coupling layer) are systematically investigated. The transducers are design and fabricated by onetime pressureless sintering of nano-Ag paste. The influences of sintering temperature on acoustic performance of the transducers are analysed by experiments in detail. The results show that the number of the pores in the pressureless sintered bulk decrease with the sintering temperature, while the pores size gradually increase. From the perspective of acoustic impedance matching, silver materials have great advantages and universality as the coupling layer between most piezoelectric wafers and steel mediums. The coupling effect of sintered Ag could be improved by increasing the temperature. The best coupling effect could be obtained by sintering at 350 degrees C, at which the primary echo of the transducer has ideal waveform and bandwidth.