论文部分内容阅读
以环氧树脂为基体,铌镁锆钛酸铅[0.375Pb(Mg_(1/3)Nb_(2/3))O_3·0.375PbTiO_3·0.25PbZrO_3,PMN]为压电功能体,采用切割-浇注法制备了1-3-2型压电复合材料。分析讨论压电陶瓷体积分数((?),下同)对1-3-2型压电复合材料压电性能、介电性能及声阻抗的影响。结果表明:随着PMN的(?)的增加,复合材料的压电应变常数(d_(33))和声阻抗(Z)增大;相对介电常数(ε_r)几乎呈线性增加,且当PMN的(?)为47.47%时,复合材料的ε_r=1 660,远小于纯PMN陶瓷的(ε_r=4000)。压电电压常数(g_(33))及介电损耗(tanδ)则呈下降趋势;与PMN相比较,1-3-2型压电复合材料厚度方向的谐振明显增强,机械品质因数(Q_m)显著降低;随着PMN的(?)的增加,复合材料的平面机电耦合系数(K_p)减小,而厚度机电耦合系数(K_t)增加。
Based on epoxy resin, niobium magnesium titanate lead titanate [0.375Pb (Mg_ (1/3) Nb_ (2/3)) O_3 · 0.375PbTiO_3 · 0.25PbZrO_3, PMN] Law prepared 1-3-2 piezoelectric composite materials. The influence of the volume fraction of piezoelectric ceramics ((?), The same below) on the piezoelectric properties, dielectric properties and acoustic impedance of 1-3-2 piezoelectric composites was analyzed and discussed. The results show that the piezoelectric strain constant (d_ (33)) and acoustic impedance (Z) of the composites increase with the increasing of PMN, and the relative permittivity (ε_r) increases almost linearly. (?) Is 47.47%, ε_r = 1 660 for the composites is much smaller than that of pure PMN ceramics (ε_r = 4000). The piezoelectric constant (g_ (33)) and dielectric loss (tan δ) decreased. Compared with PMN, the resonance in the thickness direction of 1-3-2 piezoelectric composite obviously increased. The mechanical quality factor (Q_m) (K_p) of the composites decreased with the increase of (?), While the thickness electromechanical coupling coefficient (K_t) increased.