Fabrication and Properties of 2-2 Cement Based Piezoelectric Composites

Composites with 2-2 connectivity were fabricated from lead magnesium niobate-lead zirconate-lead titanate(PMN) and sulphoaluminate cement by cut-filling process. The influences of PMN volume fraction and water/cement ratio on the properties of the composite were investigated. The results show that the piezoelectric strain constant d₃₃ increase rapidly with increasing volume fraction of PMN. When the PMN volume fraction is about 0.60, the d₃₃ value is up to 357 pCN^-1. The planar electromechanical coupling coefficient K_p of the composites is lower than that of PMN ceramic, while the thickness electromechanical coupling coefficient K_t is higher than that of PMN ceramic. The water/cement ratio has little influence on piezoelectric properties of 2-2 cement based piezoelectric composite.