Piezoelectric ceramic composite for multilayered piezoelectric actuators

摘要

The present invention is a high electromechanical coupling factor and the piezoelectric constant that can be used in a piezoelectric multilayer piezoelectric actuator displacement control as and to provide a piezoelectric ceramic composition for a laminated type piezoelectric actuator having a low sintering temperature, the piezoelectric ceramic composition is Pb (Mg _1/3 Nb _2/3 ) O ₃ , Pb (Zr _b Ti _1-b ) O ₃ , Pb (Fe _{1 / 2} Nb _1/2 ) O ₃ , respectively stable ABO ₃ to prepare a composite powder having a perovskite structure A Pb [(Zr _b Ti _1-b ) _x (Mg _1/3 Nb _2/3 ) _y (Fe _1/2 Nb _1/2 ) _z ] O ₃ + a wt.% Li ₂ O has a composition of. ; According to the present invention, the sintering temperature is below 950 is excellent in piezoelectric characteristics can be manufactured in a laminated piezoelectric actuator, a piezoelectric transformer and an ultrasonic transducer, such as a highly reliable piezoelectric component ignition device. In addition, when the sintering temperature is applied to the multi-layer piezoelectric component to be produced at lower temperatures than the conventional PZT Pd (palladium) it is possible to reduce the content, and to be able to take advantage of the economic value than the inexpensive electrode material, the conventional PZT It has an effect for reducing environmental pollution caused by volatilization of Pb by firing at a lower temperature.