Multi-layer chip piezoelectric ceramic devices

Multi-layer chip piezoelectric ceramic devices are favored by their high efficiency and miniaturization, such as the development and research of multilayer chip piezoelectric transformers (MPT) and multilayer chip piezoelectric actuators (M PA). But for a long time multi-layer piezoelectric ceramic devices is using piezoelectric bimorph tube materials and electrode materials co-firing constraints. Using low temperature co-firing can be nickel, copper, silver and other base metals for the electrode. For multilayer piezoelectric devices, we expect the piezoelectric ceramic material to have high relative permittivity for piezoelectric sensor crystal , low dielectric loss tan , and low sintering temperature. Through experiments, PM S-PZT piezoelectric disc crystal have the best dielectric and piezoelectric properties at moderate temperature (about 1100 ℃). These features are especially suited for high power devices such as ultrasonic motors, piezoelectric transducers, motor transducers and other electronics. The improvement of low-temperature piezo ceramic disc piezoelectric ceramics has played a huge role in promoting the widespread use of piezoelectric ceramics in the field of electronic technology. However, due to the high hardness of piezoelectric ceramics, brittleness, which is difficult to process. Therefore, the manufacture of a complicated piezoelectric ceramic body has always been a big problem.New State Key Laboratory of Ceramics and Fine Processing PZT piezoelectric ceramics are prepared by gelcasting, which solves the urgent problems in the preparation of piezoelectric ceramics. At the same time, low-temperature sintering of piezoelectric ceramics also inhibits the diffusion of silver ions into the piezo expansion sensor piezo ceramic during the process of silver infiltration. We know that ceramic is an insulating medium, and only after the polarization of the ceramic piezoelectric. However,piezo ceramics can not be directly polarized like metals and piezoelectric ring transducer must be metallized first. The use of low temperature sintering infiltration can offer silver method, chemical silver immersion method is to solve the polarization problem of ceramics.