method of reducing the sintering temperature

Another method of reducing the sintering temperature is based on the preparation of ultra-fine powders. In order to ensure good piezoelectric properties of piezoelectric ceramic materials, piezo micro-actuator silicates communication and energy conservation considerations, people have to focus on the initial stage of sintering - the preparation of PZT powder.the better PZT piezoelectric cylinders is the uniformity, the higher is the surface activity, the more is conducive to the sintering process, thereby reducing the sintering temperature. At present, on the powder preparation techniques are hydrothermal, so l-ge, chemical coprecipitation and so on. Hydrothermal synthesis of small particle size is large surface activity of PZT piezo transducer circuit . Experiments show that this PZT powder lead oxide evaporation temperature of 924. 71 ℃. While the reaction temperature between the particle size is 911. 26°C, thereby avoiding the volatilization of lead oxide. Piezoelectric ceramics is prepared by the process of powder not only piezoelectric properties have been greatly improved, including Bi015 N series of ceramics with the largest series of piezoelectric constant, compared with the traditional process, d33 is increased by nearly 40% . Moreover, within a certain range, with the increase of Ba content, the remanent polarization Pr and the coercive field Ec of piezoelectric disc crystal gradually decrease, and the depolarization temperature decreases gradually.Recently, high density barium titanate BaTiO3 nanocrystals is having a grain size of 80 mm,which piezo ceramic matter dispersion were successfully synthesized by the discharge plasma method (SPS). The discharge plasma method (SPS) is a rapid sintering method. Compared with the traditional sintering method, SPS sintering mini piezo ceramic discs are holding time is short, high density after sintering, grain growth can be significantly inhibited in the late sintering, to overcome the Ryn Deficiencies. PZT piezoelectric ceramics in addition to improving the production process, but also for chemical composition changes to achieve modification. Such as equivalent ion substitution, such as modified additives. PZT-4, PZT-5A, PZT-6B and they obtain this method all have their own characteristics.