Processing and Electrical Properties of Piezoelectric Ceramics Formed by Gelcasting
用凝胶注模成型制备压电陶瓷体及其电学性能研究

In this article the colloidal chemistry of PZT powders in aqueous solution, the rheological behaviors of the PZT suspension and the influence of dispersants on the rheology of the suspension and on the electrical properties of the gelcast PZT samples were investigated in comparison with those of die pressed ones. The results show that because the electrical properties of PZT are very sensitive to their composition, unsuitably selected dispersants can result in the deterioration of the electric properties of the material although concentrated PZT slurry with low viscosity can be obtained by different dispersants. The results also indicate that the influence of the additives on the properties of the samples should be considered when gelcasting is applied to the forming of electronic ceramics.