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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d33、相对介电常数rε和声阻抗率Z呈现明显的增大趋势;而压电电压常数g33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8.24×106N.s/m3,接近于混凝土的声阻抗率9.0×106N.s/m3,适用于制作混凝土超声无损检/监测换能器。
Using cutting casting method, polymer-modified sulphoaluminate cement as the base, lithium niobate zirconium titanate (referred to as P (LN) ZT) as a functional body prepared 1-3 polymer modified cement-based piezoelectric composite material. The effect of P (LN) ZT ceramic volume fraction on the piezoelectric and dielectric properties of the composites was investigated. The results show that as the volume fraction of P (LN) ZT ceramics increases, the piezoelectric strain constant d33, relative dielectric constant rε and acoustic impedance Z increase obviously. The piezoelectric constant g33 and dielectric loss tanδ Then show a downward trend. Compared with P (LN) ZT ceramic, the vibration in the thickness direction of 1-3 piezoelectric composite increases and the mechanical quality factor obviously decreases. When the volume fraction of P (LN) ZT ceramic is 30.86%, the acoustic impedance ratio is 8.24 × 106N.s / m3, close to the acoustic impedance of concrete 9.0 × 106N.s / m3, suitable for making concrete ultrasonic non-destructive testing / monitoring transducer.