0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3单晶/环氧树脂1-3型复合材料的压电性能研究

模拟了0.7Pb(Mg_1/3Nb_2/3)O₃-0.3PbTiO₃(PMN-0.3PT)单晶1-3型压电复合材料的性能与单晶体积分数的关系，得出性能最优时压电相的体积分数为64%, 在这一体积分数下，采用切割-填充法，并使用了不同类型的环氧树脂填充制备复合材料.系统地研究了聚合物相对复合材料性能的影响，研究表明，减小聚合物相的刚度系数c和密度ρ有利于提高复合材料的性能，且聚合物相与压电相的结合强度对性能的影响非常明显，制备的PMN-0.3 PT单晶1-3型复合材料的厚度伸缩机电耦合系数k_t高达90.1%，压电系数d₃₃大于1000pC/N，机械品质因数Q_m为10.39，声阻抗Z也大大降低，性能明显优于传统的Pb(Zr_xTi_1-x)O₃(PZT)陶瓷及其1-3复合材料，在压电换能器和传感器中显示出广阔的前景.关键词：PMN-PT单晶压电复合材料压电相聚合物相

Research on the performace of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 single crystal/polymer 1-3 piezoelectric composite material

The electrical properties of 0.7Pb(Mg_1/3Nb_2/3)O₃-0.3PbTiO₃ (PMN-0.3PT) single crystal/polymer 1-3 composites were simulated under different volume fraction of the piezoelectric phase. It was concluded that the composites exhibit optimal properties when the PMN-0.3PT volume fraction is around 64%. Under this volume fraction, the composites with different polymer phases were fabricated using dice-and-fill method. Experiment shows that the stiffness coefficient c, density ρ, as well as the bonding strength have great influence on the obtained properties of the composites. The composites exhibit excellent properties, with electromechanical coupling factor k_t as high as 90.1%, piezoelectric d₃₃ larger than 1000 pC/N, mechanical quality factor Q_m only 10.39, and acoustic impedance Z less than 20 MRayls. The results indicate that these piezoelectric composites are promising candidates for transducer and sensor applications.