基于PMNT陶瓷的1-3型压电复合材料软模板法制备及其超声换能器研究  

Preparation of 1-3 piezoelectric composites based on PMNT ceramics by soft mold method and research of ultrasound transducer

作　　者：孙瑞雨 李晓兵 杨钊萍 陈兴飞 孙丰龙 陈建伟[2] 夏子颐 周长江 SUN Ruiyu;LI Xiaobing;YANG Zhaoping;CHEN Xingfei;SUN Fenglong;CHEN Jianwei;XIA Ziyi;ZHOU Changjiang(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Key Laboratory of Optoelectronic Material and Device,Department of Physics,Shanghai Normal University,Shanghai 200234,China;Department of Sonography,People's Hospital Affiliated to Shandong First Medical University,Jinan 250000,China)

机构地区：[1]上海理工大学健康科学与工程学院,上海200093 [2]中国科学院上海硅酸盐研究所,上海200050 [3]上海师范大学物理系光电材料与器件重点实验室,上海200234 [4]山东第一医科大学附属人民医院超声科,济南250000

出　　处：《功能材料》2024年第5期5001-5006,共6页Journal of Functional Materials

基　　金：国家自然科学基金(52372119)。

摘　　要：医用高频超声换能器广泛应用于人体及生物组织的精细结构成像。1-3型压电复合材料因具有较高的机电耦合系数和较低的声阻抗而成为高频超声换能器的核心材料。基于有限元计算和软模板法设计制备了高性能Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)陶瓷/环氧树脂压电复合材料,并对材料进行了系统的电学性能测试。结果显示该1-3型压电复合材料具有优异的声学综合性能,其厚度伸缩模式机电耦合系数k t达到70.1%,其声阻抗Z a达19.05 MRayl。利用该材料制备了高频超声换能器,其-6 dB带宽达85%,插入损耗为17.7 dB。结果表明使用软模板法制备的压电复合材料具有适合于超声成像的优异的综合性能,有望促进高频超声换能器的商业化应用。Medical high-frequency ultrasonic transducers are widely used in fine structure imaging of human body and biological tissues.The 1-3 piezoelectric composite material has become the core material of high frequency ultrasonic transducer because of its high electromechanical coupling coefficient and low acoustic impedance.In this paper,high-performance Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)ceramic/epoxy piezoelectric composites were designed and prepared based on finite element calculation and soft template method,and the electrical properties of the materials were systematically tested.The results show that the 1-3 piezoelectric composite material has excellent acoustic comprehensive performance.The electromechanical coupling coefficient kt of the thickness expansion mode reaches 70.1%,and the acoustic impedance Za reaches 19.05 MRayl.A high-frequency ultrasonic transducer was fabricated using this material,with a-6 dB bandwidth of 85%and an insertion loss of 17.7 dB.The results show that the piezoelectric composites prepared by the soft template method have excellent comprehensive properties suitable for ultrasonic imaging,which is expected to promote the commercial application of high-frequency ultrasonic transducers.

关 键 词：1-3型压电复合 PMNT陶瓷 高频超声换能器 软模板法 

分 类 号：TB332[一般工业技术—材料科学与工程] TB552[理学—物理]