铌酸钾钠基无铅压电陶瓷的制备及改性研究

发布时间：2018-05-09 19:43

  本文选题：铌酸钾钠 + 无铅压电陶瓷　； 参考：《广西大学》2015年硕士论文

【摘要】：采用常规固相烧结法制备了KNN系列陶瓷,以x射线衍射仪等方法表征试样的微结构,采用压力陶瓷d33测试仪、精密阻抗分析仪等表征其电性能。研究(KxNa1-x)NbO3、掺ZnO的KNN体系与LS-NN体系的烧成工艺、组分、相变、结构和压电、介电性能间关系。实验主要内容及结论如下：系统探究了纯KNN陶瓷的烧成工艺、K2C03的成分与陶瓷的微结构、压电与介电性能的相互关系,结果显示：烧结温度和K的组分对陶瓷的结构、致密度、压电与介电性能有很大影响,烧成的温度1060℃时,当添加K的量为x=0.5时,陶瓷能够得到较优秀性能：d33=85pC/N,p=4.184g·cm-3,εr (1kHz)=647,tanδ(1kHz)=0.0776。对于纯的KNN陶瓷烧结表现差、致密性不高等问题,向KNN陶瓷中引入具有助烧性的氧化锌以改善其烧结表现,并且研究KNN-xwt%ZnO陶瓷的组分、烧结温度、微结构、相变和电性能的关系。实验结果表明,随烧结的温度升高,d33和密度均先升高后下降,To-t和Tc出现细微变化；随着添入ZnO量的增加,d33和密度先升高后下降；εr先降低后升高,Tanδ则一直下降,To-t与Tc都向低温方向偏移。当烧成的温度为1100℃,ZnO的掺杂量x=0.5wt%时,陶瓷能够获较好的性能：d33=113pC/N, p=4.436g-cm-3, εr(1kHz)=810.62,tan8(1kHz)=0.0517。系统探究(1-x)KNN-xLS陶瓷的烧成工艺、组分、结构、相转变及电性能关系。随烧成的温度上升,陶瓷的d33和密度均先上升后下降,所有的温度下的试样明显的介电峰,当烧成的温度为1050℃时,能够得到较好性能：d33=98pC/N,p=4.255g·cm-3,εr(10k)=554.95;随着添加LS量的增加,d33和密度起初增加后降低；εr先下降后略微升高；Tanδ和TC都朝低温区偏移。当x=4at.%、烧结温度为1050℃时,KNN-LS陶瓷具有较好性能：d33=108pC/N,p=4.18g.cm-3,εr(10k)=193.98, tanδ(10kHz)=0.041。
[Abstract]:KNN series ceramics were prepared by conventional solid-state sintering method. The microstructure of the samples was characterized by X-ray diffractometer. The electrical properties of the samples were characterized by pressure ceramics d33 tester and precision impedance analyzer. The sintering process, composition, phase transition, structure, piezoelectric and dielectric properties of KxNa1-xNbO3, ZnO doped KNN system and LS-NN system were studied. The main contents and conclusions of the experiment are as follows: the relationship between the composition of K2C03 and the microstructure, piezoelectric and dielectric properties of pure KNN ceramics is systematically investigated. The results show that the sintering temperature and the composition of K are the structure and density of the ceramics. The piezoelectric and dielectric properties are greatly affected. When the sintering temperature is 1060 鈩，

本文编号：1867168