新型超高温压电细晶陶瓷的制备及性能调控

项目名称： 新型超高温压电细晶陶瓷的制备及性能调控

项目编号： No.21471159

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 田晓霞

作者单位： 中国人民解放军空军工程大学

项目金额： 45万元

中文摘要： 航空航天、能源化工、军事等许多高科技领域迫切需求超高温压电器件，国际上高温压电器件材料开发主要集中在铋层状结构材料。本项目针对约束超高温压电陶瓷实用化进程的瓶颈问题，拟对铋层状压电材料从组分设计、制备工艺两方面进行实验和理论研究，旨在制备适合700℃以上使用、压电系数d33>20pC/N的实用化超高温压电陶瓷材料。设计将超高居里温度的弱铁电体与强铁电体相固溶的超高温压电陶瓷新体系，揭示影响铋层状结构压电材料性能的物理、化学机制，并在微观尺寸上对材料的性能进行调控，解决通常为改善压电性能采用掺杂取代而引起的材料居里温度降低问题；同时采用水热法合成纳米陶瓷前驱粉体，通过特殊的常压烧结工艺得到细晶陶瓷，解决材料难以极化及高温烧结造成Bi元素挥发导致材料损耗增大问题，增强其压电性能。该项目为高性能超高温压电陶瓷的设计、性能调控提供新思路、新工艺，具有重要工程应用价值和较大科学研究意义。

中文关键词： 铋层状结构；超高温；压电陶瓷；细晶陶瓷；晶粒尺寸效应

英文摘要： The urgent need for ultrahigh-temperature piezoelectric devices is imperative in hi-tech domains such as aviation, energy and chemical industries. Currently, the development of ultrahigh-temperature piezoelectric materials mainly focuses on Bismuth layer-structured ferroelectrics (BLSF) with high Curie temperature. Dealing with the bottleneck problems that limit practical applications of ultrahigh temperature piezoelectric ceramics, this project will carry out experimental and theoretical investigations on the Bismuth layer-structured materials in the two aspects of composition design and preparation techniques, with the aim to develop practical ultrahigh temperature piezoelectric ceramics suitable for above-700℃ applications and with piezoelectric coefficient larger than 20pC/N. Novel ultrahigh temperature piezoelectric ceramic systems will be designed by solid-sloving weak and strong ferroelectric materials with ultrahigh Curie temperatures, so as to disclose phsyical and chiemical mechanisms that affect the performances of Bismuth layer-structured piezoelectric materials. The material performances are adjusted microscopically so as to solve the Curie temperature reduction problem resulted from doping in improving the piezoelectric performances. Meanwhile, using the water heat method, nano-scale ceramic precur

英文关键词： Bismuth Layer-structured；ultrahigh temperature；piezoelectric ceramics；fine-grained ceramic；grain size effect