Abstract:

BaTiO₃ is widely used in functional ceramics, multilayer ceramic capacitors due to its high dielectric constant, ferroelectricity, piezoelectricity. It also has potential applications in biomedicine and dry diagnostics due to its high whiteness and high reflectivity. The preparation methods of spherical BaTiO₃ ultrafine powders with uniform particle size were introduced. The advantages and disadvantages of various methods such as hydrothermal method, sol-gel method and precipitation method were illustrated. New synthesis methods in recent years including combined traditional wet chemical method, combined new technology-wet chemical, and complete new wet chemical synthesis method, were briefly discussed. The precipitation method with the advantages of simple operation, simple process, low cost and easy availability can still have industrial development prospects. On the basis of the supergravity precipitation preparation technology, spherical BaTiO₃ ultrafine powder can be obtained, which is beneficial to subsequent industrial production. Microchannel technology is expected to produce BaTiO₃ ultrafine powders with promising development prospects. The mechanism of BaTiO₃ synthesized by new technologies still needs to be further researched. At present, most researches on uniform spherical BaTiO₃ ultrafine powder are in small-scale laboratory production, and the synthetic device required for industrial scale production needs further exploration.

Key words: barium titanate, spherical, powders, preparation

摘要：

BaTiO₃材料因具有高介电常数及铁电、压电等特性广泛用于功能陶瓷等领域外，还因其具有高白度、高反射率等特点而在生物医药及干式诊断等领域也存在着潜在应用。本文介绍了均一粒径的球形BaTiO₃超细粉体的制备技术，简述了水热法、溶胶-凝胶法、沉淀法等制备技术的优势与不足，并对近年来兴起的新合成方法——传统湿化学联用法、新技术-湿化学联用法、全新湿化学合成法作了简要论述。具有操作简便、工艺简单、原料低廉易得等优势的沉淀法仍具有工业化发展前景，在此基础上的超重力沉淀制备技术可得到球形BaTiO₃超细粉体，利于后续工业化生产；而微通道技术有望制备得球形BaTiO₃超细粉体，其发展前景可观。对于新技术合成BaTiO₃机理还需深入研究；目前对均一球形BaTiO₃超细粉体的研究大多处于实验室小规模生产，其工业放大生产所需合成装置有待进一步探索。

关键词: 钛酸钡, 球形, 粉体, 制备