2-2型水泥基压电机敏复合材料的研制

Study on 2-2 Cement Based Piezoelectric Composite

在土木工程领域中 ,智能结构系统越来越受到人们的重视 ,而在智能结构系统中机敏材料是不可缺的元素 ,它是构成智能结构中的传感器和驱动器的关键材料。针对目前土木工程领域智能结构中存在的结构材料与机敏材料相容性差问题 ,采用水泥基材料作为压电机敏复合材料的基体 ,通过调节水泥基材料组分和比例 ,克服水泥基材料与压电陶瓷在密度上的悬殊差异为材料准备带来的困难 ,制备出 2 - 2型水泥基压电机敏复合材料。同时 ,采用集成了微型计算机、MTS自动伺服试验机、示波器、信号发生器、线性放大器和 HP- IB界面的测试系统测量 2 -2型水泥基压电复合材料的弹性性能、传感性能和驱动性能。实验结果表明 ,在实验范围里 ,该材料具有线弹性性能 ;传感性能和驱动性能具有明显的频率依赖性 ;在超低频范围内 ,2 - 2型水泥基压电复合材料的压电电压系数的模值随频率线性增大 ,相角随频率增大开始时增大较快 ,随后趋于一常数 ;2 - 2型水泥基压电复合材料的压电性能与聚合物基压电复合材料相似。

Intelligent structures are attracting more attention of scientists and engineers in the field of civil engineering.In an intelligent structure,smart materials play animportant role,from which sensors and actuators are made.In order to solve the mismatch problem between smart materials and host materials,which is popular in the application of intelligent structures in the civil engineering field.Cement based materials were chosen to be the matrix of piezoelectric smart materials.Through adjusting the mix proportion and selecting the components of cement based matrix,problems of fabrication of 2 2 cement based piezoelectric composite were overcome.Using a testing system integrating computer,MTS tester,oscilloscope,signal generator,linear amplifier,HP IB interface hardware and software,the elastic,sensory and actuating properties were studied.The following results can be obtained.The composite is linearly elastic.The sensory and actuating properties have obvious dependence on frequency.In the range of ultra low frequency,the magnitude of piezoelectric voltage factor of the composite increases linearly with frequency,the phase increases quickly at first,but then approaches to a constant,The piezoelectric properties of the composite are similar to those of polymer/ceramic piezoelectric composites.