The influence of processing parameters on piezoelectric and dielectric properties of dome-shaped composite PZT-epoxy actuators
The influence of processing parameters on piezoelectric and dielectric properties of dome-shaped composite PZT-epoxy actuators
复制标题
DOI：
10.1016/j.jmapro.2020.05.036
复制
发表时间：
2020-09
影响因子：
6.2
通讯作者：
W. Du;J. Hoyt;N. Williams;K. Cook-Chennault
中科院分区：
文献类型：
--
作者：
W. Du;J. Hoyt;N. Williams;K. Cook-Chennault
采用改进的溶胶凝胶和旋涂技术制备了厚膜穹顶状的PZT-环氧复合材料结构。研究了工艺参数和极化技术(电晕与接触极化)对压电性和介电性的影响。当PZT体积分数为0.7时，其纵向压电系数、有效介电常数和介电损耗的最大值分别为11.1pC/N、28.7和0.004。这种穹顶结构的压电应变系数是以前报道的结构和组成相似的PZT-环氧穹顶结构的7倍。借助扫描电子显微镜(SEM)图像分析了样品的形貌。除了表面粗糙度外，随着PZT体积分数的增加，压电应变系数、电容和有效介电常数也随之增加。电晕极化的样品有利于更高的极化电压(45kV/mm和70kV/mm)，并导致更高的压电应变系数值。对此类复合材料结构的研究将推动具有更高位移和力学性能的弯曲和半球形压电致动器的发展。
Thick film dome-shaped composite PZT-epoxy structures have been fabricated using a modified sol gel and spin coating technique. Processing parameters and polarization technique (Corona versus contact polarization) have been studied to elucidate their influence on piezoelectric and dielectric properties. The volume fraction of PZT was varied from 0.0 to 0.7 and the highest values for the longitudinal piezoelectric coefficient, effective dielectric constant (@1kHz) and dielectric loss (@1kHz), were 11.1 pC/N, 28.7 and 0.004 respectively for the PZT volume fraction equal to 0.7. The piezoelectric strain coefficient for this dome structure was 7 times higher than previously reported values for a composite PZT-epoxy dome structure of similar structure and composition. The sample morphology was examined with the aid of scanning electron microscopy (SEM) images. The piezoelectric strain coefficients, capacitance, and effective dielectric constant increased with increasing PZT volume fraction, in addition to the surface roughness. Samples that were Corona poled facilitated higher polarization voltages (45 kV/mm and 70 kV/mm) and resulted in higher values of piezoelectric strain coefficients. Investigation of composite structures such as these will advance the development of curved and hemispherical piezoelectric actuators with enhanced displacement and mechanical properties.