Influence of water-cement ratio on the properties of 2-2 cement based piezoelectric composite

摘要

Composites with 2-2 connectivity were fabricated from plates of "PMN" ceramic embedded in a sulphoaluminate cement matrix by a cut-filling process. The influences of the water-cement ratio in the matrix on the properties of the composite were analyzed. The results show that when the water-cement ratio is less than 0.4, the piezoelectric stain factor d_(33) and piezoelectric voltage factor g_(33) increase smoothly. When the water-cement ratio is larger than 0.4, d_(33) and g_(33) increase obviously with increasing the water-cement ratio. This is attributed to a more effective contact between the active and matrix phases. d_(33) = 322 pc N~(-1) and g_(33) = 20.9 mV mN~(-1) at a water-cement ratio of 0.45. The planar electromechanical coupling coefficient K_p of the composite is nearly independent of the water-cement ratio. With increasing the water-cement ratio, the thickness electromechanical coupling coefficient K_1 of the composite increases, while the mechanical quality factor Q_m exhibits the trend of decrease.