INFLUENCE OF DIFFRENT MATRIX ON THE PROPERTIES OF 1-3 PIEZOELECTRIC COMPOSITES

摘要

1-3 piezoelectric composites were fabricated by the cut-filling method, using PLN ceramicas function, cement and polymer as matrix. The fabrication procedure of composites wasintroduced in detail. The effect of different matrix on the piezoelectric properties, dielectricproperties, the electromechanical coupling coefficients and acoustic impedance of compositeswere studied. The results indicate that with the same size and space of the piezoelectricceramic rods and the same volume fraction, the composites with different matrix have greatinfluence on piezoelectric stain factor d33, while polymer-based piezoelectric composite d33 issignificantly higher than that of the cement-based composite. However, different matrix havelittle effect on the piezoelectric voltage factor g33, and the composite fabricated using polymeras matrix has larger thickness electromechanical coupling factor Kt, less dielectric loss tan8and mechanical quality factor Qm. The acoustic impedance of cement based piezoelectriccomposite is close to that of polymer based composite, which means the matrix of compositesimpact on acoustic impedance weakly. But the acoustic impedance of the polymer-basedpiezoelectric composite is more close to that of the concrete comparing with cement-basedcomposite. Adjusting volume fraction of ceramic rods can resolve efficaciously the matchingproblem of the acoustic impedance of the intelligent material, which also shows that the 1-3piezoelectric composite is suitable to be applied in civil structural health monitoring.