基于软模法制备1-3型压电复合材料及高频医用超声换能器  

Fabrication of 1-3 Piezocomposite and High-Frequency Medical Ultrasonic Transducer Via Soft-Mold Process

作　　者：苏一凡 汪跃群 李晓兵 孙瑞雨 田俊亭 姜立新 蒋卓韵 聂生东[1] SU Yifan;WANG Yuequn;LI Xiaobing;SUN Ruiyu;TIAN Junting;JIANG Lixin;JIANG Zhuoyun;NIE Shengdong(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;The 9th Research Laboratory,715 Research Institute of China State Shipbuilding Corporation Limited,Hangzhou 310023,China;Ultrasonography Dept,Shanghai Renji Hospital,School of Medicine,Shanghai Jiaotong University,Shanghai 200025,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]中国船舶集团第七一五研究所第九研究室,浙江杭州310023 [3]上海交通大学医学院附属上海市仁济医院超声科,上海200025

出　　处：《压电与声光》2023年第2期320-325,共6页Piezoelectrics & Acoustooptics

基　　金：上海市自然科学基金资助项目(19ZR1436200,19440760800)。

摘　　要：高频医用超声成像技术因其高空间分辨率而被广泛应用于人体组织的精细结构观察,其中高频超声换能器的核心材料是1-3型压电复合材料。采用软模板法直接烧结了锆钛酸铅(PZT)压电微柱阵列,进而制备PZT/环氧1-3型压电复合材料,并对其进行了微观结构观察和电学性能表征。材料微观结构完整,机电耦合系数达到0.64。采用此复合材料制备了中心频率为20 MHz的高频超声换能器。采用脉冲回波法对换能器进行了性能和声场测试,并利用其对人体皮肤进行了超声成像,换能器的插入损耗、带宽分别为13.1 dB和84.2%。结果表明,软模法制备的1-3型压电复合材料能使高频超声换能器兼具低插入损耗和大带宽,这为高性能高频医用超声换能器提供了一种低成本、高效率的商业化制备方法。The high-frequency medical ultrasonic imaging technology has been widely used in the observation of fine structures with human tissues due to its high spatial resolution,and 1-3 piezocomposite are the core of high-frequency ultrasonic transducer.The PZT ceramic micropillar array was sintered by the soft mold process to fabricate the PZT/epoxy 1-3 piezoelectric composite,and the microstructure observation and electrical properties characterization were carried out.The microstructure is complete and the electromechanical coupling coefficient reaches 0.64.A high-frequency ultrasonic transducer with center frequency of 20 MHz was designed and fabricated based on the prepared piezocomposite.The performance and the sound field of the transducer were tested by pulse echo method,and the ultrasonic imaging for the skin of human was carried out.The insertion loss and bandwidths of the transducer were 13.1 dB and 84.2%,respectively.It is indicated that the 1-3 piezocomposite via the soft mold process can make high-frequency ultrasonic transducer with low insertion loss and large bandwidth,which provides a low-cost and high-efficiency commercial way for the high-frequency medical ultrasonic transducers.

关 键 词：1-3型压电复合材料 软模法 高频超声换能器 医用超声成像 

分 类 号：TN384[电子电信—物理电子学]