本文選題：鈮酸鉀鈉 + 無鉛壓電陶瓷　； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：采用常規(guī)固相燒結(jié)法制備了KNN系列陶瓷,以x射線衍射儀等方法表征試樣的微結(jié)構(gòu),采用壓力陶瓷d33測試儀、精密阻抗分析儀等表征其電性能。研究(KxNa1-x)NbO3、摻ZnO的KNN體系與LS-NN體系的燒成工藝、組分、相變、結(jié)構(gòu)和壓電、介電性能間關(guān)系。實驗主要內(nèi)容及結(jié)論如下：系統(tǒng)探究了純KNN陶瓷的燒成工藝、K2C03的成分與陶瓷的微結(jié)構(gòu)、壓電與介電性能的相互關(guān)系,結(jié)果顯示：燒結(jié)溫度和K的組分對陶瓷的結(jié)構(gòu)、致密度、壓電與介電性能有很大影響,燒成的溫度1060℃時,當(dāng)添加K的量為x=0.5時,陶瓷能夠得到較優(yōu)秀性能：d33=85pC/N,p=4.184g·cm-3,εr (1kHz)=647,tanδ(1kHz)=0.0776。對于純的KNN陶瓷燒結(jié)表現(xiàn)差、致密性不高等問題,向KNN陶瓷中引入具有助燒性的氧化鋅以改善其燒結(jié)表現(xiàn),并且研究KNN-xwt%ZnO陶瓷的組分、燒結(jié)溫度、微結(jié)構(gòu)、相變和電性能的關(guān)系。實驗結(jié)果表明,隨燒結(jié)的溫度升高,d33和密度均先升高后下降,To-t和Tc出現(xiàn)細(xì)微變化；隨著添入ZnO量的增加,d33和密度先升高后下降；εr先降低后升高,Tanδ則一直下降,To-t與Tc都向低溫方向偏移。當(dāng)燒成的溫度為1100℃,ZnO的摻雜量x=0.5wt%時,陶瓷能夠獲較好的性能：d33=113pC/N, p=4.436g-cm-3, εr(1kHz)=810.62,tan8(1kHz)=0.0517。系統(tǒng)探究(1-x)KNN-xLS陶瓷的燒成工藝、組分、結(jié)構(gòu)、相轉(zhuǎn)變及電性能關(guān)系。隨燒成的溫度上升,陶瓷的d33和密度均先上升后下降,所有的溫度下的試樣明顯的介電峰,當(dāng)燒成的溫度為1050℃時,能夠得到較好性能：d33=98pC/N,p=4.255g·cm-3,εr(10k)=554.95;隨著添加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都朝低溫區(qū)偏移。當(dāng)x=4at.%、燒結(jié)溫度為1050℃時,KNN-LS陶瓷具有較好性能：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，

本文編號：1867168