压电陶瓷粒度分布对锆钛酸铅/聚偏氟乙烯复合材料电性能的影响

Effect of piezoelectric particles size distribution on electric properties of PZT/PVDF composites

将不同粒度的锆钛酸铅(PZT)陶瓷粉进行复配,制成不同粒度分布的PZT陶瓷颗粒,然后与聚偏氟乙烯(PVDF)复合制备不同PZT粒度分布的PZT/PVDF复合材料,研究了复合材料的介电性能和压电性能。结果表明,当陶瓷颗粒体积分数高达70%时,双峰分布复合材料的压电系数可达75 pC.N-1。这是由于双峰分布复合材料中大陶瓷颗粒保持了完整的钙钛矿结构,小陶瓷颗粒填充在大颗粒之间,陶瓷颗粒彼此联接,形成了更多的电-力耦合通道,有效地实现了压电效应的传递。大陶瓷颗粒完整的钙钛矿结构以及大、小颗粒的协同堆砌效应,提高了PZT/PVDF复合材料的电性能。

Lead zireonate titanate particles with different particle size contributions were obtained by mixing with different size PZT powders, which were employed to prepare PZT/PVDF composites by filling PZT particles in PVI）F matrix. The dielectric and piezoelectric properties of composites were determined. The results show that the piezoelectric coefficient of composites with bimodal distribution can reach 75 pC. N^-1 as the PZT volume fraction is up to 70%. It can be explained that the piezoelectric composites with bimodal distribution exhibit a better continuous distribution because of the micro-particles filling up among larger particles. This provides more paths for mechanical - electric coupling. All these make the PZT/PVDF composite show a satisfying piezoelectric property.