以硫铝酸盐水泥为基体,铌锂锆钛酸铅[0.08Pb(Li1/4Nb3/4)O3·0.47PbTiO3·0.45PbZrO3](简称PLN)压电陶瓷颗粒为功能体制备了0-3型水泥基压电复合材料.利用X射线衍射(XRD)和扫描电子显微镜(SEM)对水泥基压电复合材料的相组成和显微结构进行了分析和观察,重点研究了水泥基压电复合材料的介电频率特性和铁电特性.结果表明,压电陶瓷颗粒与硫铝酸盐水泥的水化产物结合良好;随着PLN含量的增加,复合材料的介电常数εr、剩余极化强度Pr和矫顽电场强度Ec均增大;在40～100 kHz频率范围内,水泥基压电复合材料的介电常数εr均随频率的增大而迅速降低,这主要受复合材料中的界面极化所影响,高频时,介电常数变化较小,表现出良好的高频介电稳定性;复合材料的电滞回线发生畸变的原因主要是PLN压电陶瓷破碎成颗粒后,本身存在许多缺陷,且与水泥复合后存在许多界面气孔.
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