Studies of a Kind of Piezoelectric Ceramics for High-power Piezoelectric Transformer

The piezoelectric ceramics (PNW-PMS-PZT) were prepared by traditional ceramics process. The phase structure of calcined powders and sintered ceramics were analyzed. Results show that increase of the sintering temperature and the content of PZT solid solution helped to create perovskite phase. The influence of sintering temperature and the content of PMS on dielectric constanter, piezoelectric constant d33, electromechanical coupling factor kp and mechanical quality factor Qm have been studied. Results show that as the amount of PMS solid solution increased in system,er, kp and d33 decreased, Qm increased. Sintering temperature increased also can improve kp and d33, At last, the piezoelectric material which haveer=1959, kp=0.614, Qm=1349, d33=390 pC/N has been obtained for high-power piezoelectric transformer.