固相合成法制备工程化应用的大应变压电陶瓷材料

Large Strain Piezoelectric Ceramics for Engineering Applications Prepared by Solid-State Synthesis Method

随着我国科技水平的飞速发展,激光惯性导航系统的精度要求越来越高。采用工业级原材料,通过固相合成法制备了铌锑-铌镍-锆钛酸铅(PSN-PNN-PZT)四元系大应变压电陶瓷材料,讨论了不同含量Sr对PSN-PNN-PZT压电陶瓷材料介电性能、压电性能的影响。结果表明:当Sr含量为1%(摩尔分数)、n(Zr)/n(Ti)=43/57(摩尔比)时,PSN-PNN-PZT组成位于准同型相界附近,压电陶瓷性能较优,获得了一种相对介电常数ε^(T)_(33)/ε_(0)、机电耦合系数k_(p)、压电常数d_(33)、介电损耗tanδ、居里温度T_(c)分别为4090、0.664、686 pC/N、0.0165及213℃的大应变压电陶瓷材料;基于该材料配方制备的∅24 mm×∅5 mm×0.4 mm压电陶瓷圆环,在100 V的驱动电压下产生的应变量能达到2.5005μm,较现有的PZT-14(P14)材料提升32.4%,能应用于高精度激光陀螺稳频器中,提高压电陶瓷微位移驱动器的可靠性。

With the rapid development of scientific and technological level,the accuracy requirements for laser inertial navigation systems are becoming increasingly high.The quaternary PSN-PNN-PZT piezoelectric ceramics with large strain were prepared by the conventional solid-state synthesis method using industrial grade raw materials.The influence of different content Sr on the dielectric and piezoelectric properties of PSN-PNN-PZT piezoelectric ceramics was discussed.It is found that when the Sr content is 1%(mole fraction)and the molar ratio of n(Zr)/n(Ti)is 43/57,the PSN-PNN-PZT composition locates at morphotropic phase boundary and the piezoelectric ceramics show excellent properties.The large strain piezoelectric ceramics can be achieved,which are as follows:relative dielectric constantε^(T) _(33)/ε_(0)=4090,electromechanical coupling coefficient k _(p)=0.664,piezoelectric constant d _(33)=686 pC/N,dielectric loss tanδ=0.0165,Curie temperature T _(c)=213℃.The strain of∅24 mm×∅5 mm×0.4 mm piezoelectric ceramic thin rings based on this material formula reaches 2.5005μm at 100 V driving voltage,which is 32.4%higher than that of the existing PZT-14(P14)material.This material can be applied in high-precision laser gyro frequency stabilizers to improve the reliability of piezoelectric micro-displacement actuator。