【作者】 陈彩凤； 韩霄丽； 刘军； 骆英；

【Author】 Cai-Feng CHEN,Xiao-Li HAN,Jun LIU,Ying LUO School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,China

【机构】 江苏省镇江市学府路301号江苏大学材料科学与工程学院；

【摘要】 压电复合材料由于具有高压电常数、高机电耦合系数和高介电常数等良好的压电性能,因此在超声换能器组件、高分辨率医疗成像系统、结构健康监测系统等领域有着广泛的应用前景。本文提出了一种新型的微/纳米PZT/环氧树脂1-3复合材料的制备方法。本方法在采用化学活化制备具有规则有序多孔结构的碳模板的基础上,以溶胶凝胶的方法生成微/纳米PZT纤维,然后将环氧树脂浇入有序排列的PZT纤维获得微/纳米PZT/环氧树脂1-3复合材料。并用XRD和SEM观察了纤维试样的形貌,用HP阻抗分析仪测试了PZT/环氧树脂1-3复合材料的阻抗频谱图,按IEEE技术标准对其机电耦合系数进行了测量。结果表明PZT纤维排列有序,直径约为十个微米左右,长度可达几厘米,表面整洁光滑,结构为典型的钙钛矿型;该种复合纤维频带较宽,纵向机电耦合系数为45.8%,可望用于具优异正交异性的传感或驱动元件中。更多还原

【Abstract】 Piezoelectric composites show high promise as components in ultrasonic transducers for higher resolution medical imaging,and structural health monitoring systems as they have excellent piezoelectric properties, such as high piezoelectric coefficients,high electromechanical coupling coefficients,and high dielectric constant.A novel Mico/Nano PZT epoxy 1-3 composite was fabricated in this work.Carbon template with porous and structurally-ordered pattern was prepared firstly by chemical activation technology.Mico/Nano PZT fibers were fabricated by the carbon template method.In addition,Mico/Nano PZT epoxy 1-3 composites had been prepared by arranging Mico/Nano PZT fibers and casting epoxy resin.The fiber samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM) techniques. The impedance-frequency of PZT/epoxy 1-3 composites were directly measured using an HP impedance analyzer.Effective electromechanical coupling of PZT/epoxy 1-3 composites were measured and calculated using a standard IEEE technique.The initial results show that the piezoelectric epoxy 1-3 composite has good piezoelectric properties and diameter of PZT fiber is only about ten microns,the length up to several millimeters.In addition,PZT fibers are smooth,straight and have the crystal structure of perovxkite type. The fabricated PZT/epoxy micro/nano composite has strong piezoelectric properties.更多还原