压电与声光, 2023, 45 (6): 910, 网络出版: 2024-01-04
高性能(K0.5Na0.5)NbO3陶瓷无铅医用超声换能器及其成像
Ultrasonic Transducer Based on High-Performance Lead-Frees(K0.5Na0.5)NbO3-Based Ceramic
无铅压电材料 (K0.5Na0.5)NbO3基陶瓷 超声成像 超声换能器 lead-free piezoelectric material (K0.5Na0.5) NbO3-based ceramics ultrasonic imaging ultrasonic transducer
摘要
(K0.5Na0.5)NbO3(KNN)陶瓷作为一类重要的高性能无铅压电材料体系,有望推动医用超声成像换能器技术的无铅化。对KNN陶瓷进行有效掺杂改性研究,采用固相烧结法制备了具有优异压电性能的KNN基压电陶瓷,其压电常数达400 pC/N,机电耦合系数为55%。基于其高压电、低声阻抗的综合性能设计制备了高分辨力、大带宽及高频率的医用超声换能器,其纵向分辨率达47 μm,-6 dB带宽达93%,中心频率为18.0 MHz。利用此换能器对人体组织模型进行B模式超声成像,获得管状组织的高分辨率结构图像。结果表明,KNN体系陶瓷是一种应用于医用高频超声成像中综合性能优异的材料。
Abstract
The (K0.5Na0.5)NbO3 ceramics, as an important high-performance lead-free piezoelectric material system, are expected to promote the lead-free development of medical ultrasound imaging transducers. The study on the effective doping modification of KNN ceramics was carried out. The KNN-based piezoelectric ceramics with excellent piezoelectric properties were prepared by solid phase sintering method. The piezoelectric constant and the electromechanical coupling coefficient were up to 400 pC/N and 55%, respectively. Based on its high piezoelectricity and low acoustic impedance, a high-resolution and large-bandwidth medical ultrasound transducer with high-resolution and large-bandwidth was prepared. The transducer has an axial resolution of 47 μm, a bandwidth of 93%@-6 dB and a center frequency of 18.0 MHz. Using the prepared transducer to perform B-mode ultrasound imaging on a human tissue model, the high-resolution structure images of tubular tissue have been obtained. The results indicate that the KNN system ceramics are a kind of material with excellent comprehensive performance for medical high-frequency ultrasound imaging.
陈兴飞, 黄尧, 李晓兵, 孙丰龙, 杨钊萍, 李尧, 罗来慧, 周长江. 高性能(K0.5Na0.5)NbO3陶瓷无铅医用超声换能器及其成像[J]. 压电与声光, 2023, 45(6): 910. CHEN Xingfei, HUANG Yao, LI Xiaobing, SUN Fenglong, YANG Zhaoping, LI Yao, LUO Laihui, ZHOU Changjiang. Ultrasonic Transducer Based on High-Performance Lead-Frees(K0.5Na0.5)NbO3-Based Ceramic[J]. Piezoelectrics & Acoustooptics, 2023, 45(6): 910.