片状KNN模板晶粒的可控制备、形成机理及织构化陶瓷研究

项目名称： 片状KNN模板晶粒的可控制备、形成机理及织构化陶瓷研究

项目编号： No.51262011

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 李月明

作者单位： 景德镇陶瓷学院

项目金额： 50万元

中文摘要： 铌酸钾钠(KNN)是近年来无铅压电陶瓷材料的研究热点。模板晶粒生长织构化技术是提高KNN陶瓷压电性能及其温度稳定性最有效的方法，现有的异质模板晶粒已经成为制约织构化KNN基陶瓷压电性能提高的瓶颈。因此，制备出具有片状结构的KNN同质模板晶粒是制备高性能织构化KNN基压电陶瓷的关键技术。本项目拟采用直接熔盐法一步合成和质子取代多步反应法两种方法实现片状KNN晶粒的制备，采用现代测试分析手段研究其形成机理，寻找出克服KNN晶粒立方块状结构生长习性的科学方法。以此片状KNN晶粒为同质模板，优选分散剂和粘结剂，制备出固相含量高且稳定均匀分散的流延浆料。采用流延成型技术制备织构化KNN基无铅压电陶瓷，研究流延成型工艺、微观结构、电学性能之间的相互关联性，优化制备出高性能且温度稳定性好的织构化KNN基无铅压电陶瓷。本研究可望丰富织构化KNN基压电陶瓷研究的理论体系，拓展KNN基无铅压电陶瓷的应用价值。

中文关键词： 铌酸钾钠；模板晶粒生长；织构化；无铅压电陶瓷；掺杂改性

英文摘要： Potassium sodium niobate (KNN) lead-free piezoceramics have been attracted much attention in recent years. The template crystal growth texturing technology is the most effective way to improve the piezoelectric properties and temperature stability of the KNN ceramics. The existing heterogeneous template crystals have become drawback of the piezoelectric properties improvement of textured KNN-based ceramics. Therefore, the preparation of homogeneous KNN template crystal with plate-like structure is the key technology for the fabrication of high performance textured KNN-based piezoceramics. This project will adopt two kinds of method, namely direct molten salt method for one-step synthesis and proton substitution multi-step reaction method, to prepare the plate-like KNN powder. The related forming mechanism is studied by means of modern testing and analysis, trying to find out the scientific method to overcome the cubic growth habit for KNN crystal. Using plate-like KNN template crystal as homogeneous templates, the slurry with high solid content and good stability is prepared through optimizing dispersing agent and binder. Tape-casting method is used to prepare textured KNN-based lead-free piezoceramics. Based on the study of interrelationship among tape-casting technology, microstructure and electrical propertie

英文关键词： potassium sodium niobate；template grain growth；textured ceramic；lead-free piezoelectric ceramics；doping modification