采用切割-浇注法, 以聚合物改性硫铝酸盐水泥为基体, 铌锂锆钛酸铅(简称P(LN)ZT)为功能体制备了1-3型聚合物改性水泥基压电复合材料. 研究了P(LN)ZT陶瓷体积分数对复合材料的压电和介电性能的影 响. 结果表明: 随着P(LN)ZT陶瓷体积分数的增加, 压电应变常数d_(33)、相对介电常数εr和声阻抗率Z呈现明显的增大趋势;而压电电压常数g_(33)和介电损耗tanδ则呈现下降趋势. 与P(LN)ZT陶瓷相比较, 1-3型压电复合材料厚度方向振动增强, 机械品质因素明显降低, 当P(LN)ZT陶瓷体积分数为30. 86%时, 其声阻抗率为8. 24×10~6N·s/m~3, 接近于混凝土的声阻抗率9. 0×10~6 N·s/m~3, 适用于制作混凝土超声无损检/监测换能器.
Piezoelectric ceramic(lead niobium lithium zirconate titanate, P(LN)ZT), sulphoaluminate cement and polymer were used to fabricate polymer modified cement piezoelectric composites by the cut-filling technique. The influence of P(LN)ZT volume fraction on the piezoelectric and dielectric properties of composites was investigated. The results show that as the P(LN)ZT volume fraction increases, the piezoelectric strain factor d_(33), relative dielectric factor εand the acoustic impedance Z increase evidently, while the piezoelectric voltage factor g_(33) and the dielectric loss tanδdecrease. Compared with P(LN)ZT, the vibration at thickness mode of 1-3 type piezoelectric composite is strengthened, however the electromechanical quality factor is reduced. When P(LN)ZT volume fraction is 30. 86%, the acoustic impedance value is 8. 24×10~6 N·s/m~3, which is close to that of the concrete(9. 0× 10~6N·s/m~3)and suitable for fabricating transducers for non destructive inspection.
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