The polarization of sintering piezoelectric ceramics

The polarization of piezoelectric ceramics directly affects the performance of ceramics, and the low-temperature sintering silvering method and chemical silver deposition method solve the polarization problem of ceramics. Experiments have found that sintered silver ions rarely diffuse into piezo ceramics. Another major method is to reduce the sintering temperature,which is the preparation of ultrafine powders. The powder morphology of piezoelectric disc datasheetis improved and the particles of the powder are nanosized. Since the fine and uniform powder has a high surface activity energy, it is favorable for the sintering process. At present, there are hydrothermal, sol-gel, and chemical coprecipitation methods for ultrafine powder preparation. Studies have shown that the PbO volatilization temperature of the hydrothermally synthesized PZT powder is 924. 71 °C, the reaction temperature of piezo cylinder generator between the particles is the development of piezoelectric ceramics and its new application is 811. 26 °C; while the solid phase synthesis of PZT powder particles ,The reaction temperature of piezo transducer sound discs was 1 243. 47 °C, and the volatilization temperature of PbO was 1 213. 29 °C. Therefore, adopting an effective synthesis method is to prepare ultra-fine PZT powder,which can control the sintering temperature below the PbO evaporation temperature, which can completely solve the problem of lead volatilization. The hydrothermal method has the advantages of small powder particle size, narrow particle size distribution range, good crystallization and good dispersibility, resonant frequency piezo discscan better control the particle size, morphology and particle size distribution.Zhao Ming. Lei and his colleagues find (Ba015 Na015) 1 - x Bax TiO3 piezoelectric ceramics are produced by the sol-g el process,which have not only greatly improved the piezoelectric performance included (Bi015 N a015) 0 194 Ba0106 TiO3 ceramics. With this series the largest piezoelectric constant, d33 = 173 × 10 -12 CPN. Compared with the traditional process, d33 of piezo disc mount is increased by nearly 40%. Moreover, in a certain range, as the Ba content increases, the material's remaining polarization Pr and coercive field Ec gradually decrease, and the depolarization temperature gradually decreases. Sol-gel has the advantages of low cost, simple process and equipment, piezo dsc sensor is one of the most widely used wet chemical preparation methods. Recently, the National Key Laboratory of Ceramics of the Department of Materials Science and Engineering of Tsinghua University has successfully synthesized for high density (>90%) barium titanate BaTiO3 nanocrystals with a grain size of 80 mm using the spark plasma method (SPS). Discharge plasma method (SPS) .Piezo transducer datasheet is a rapid sintering method. Compared with the traditional sintering method, the sintering time of the SPS is short, the density after sintering is high, and the growth of the crystal grains in the later sintering period can be significantly suppressed. In addition to the improvement in the production process, PZT-based piezoelectric ceramics can be modified by chemical components. Such as equivalent ion substitution modification, additive modification, etc.