Sr－Pb－Bi系中高压介质瓷结构与性能研究

采用Ｘ射线、ＳＥＭ等分析手段，通过实验研究了以（Ｓｒ，Ｐｂ，Ｃａ）ＴｉＯ３复合钙钛矿为基的中高压介质瓷中，Ｐｂ、Ｂｉ２Ｏ３·ｎＴｉＯ２含量（摩尔分数），ｎ值大小及ＭｎＣＯ３添加剂等因素对其微观结构及性能的影响规律。适当调节Ｐｂ含量，可获得一系列不同温度系数的高介低损耗瓷料；Ｂｉ２０３·ｎＴｉＯ２含量及ｎ值均存在优值；适量ＭｎＣＯ３作添加剂有利于介质损耗降低和介电常数温度系数的优化，室温介电常数会随其加入量的增加而降低。研制出εｒ＝２０００，ｔｇδ≤０．００５．试样｜△Ｃ／Ｃ｜≤１０％，综合性能好的中高压瓷料。

Structure and Performance of Sr-Pb-Bi System as Dielectric for Medium-hight Voltage Application

Investigaed composite perovskite ( Sr . Pb . Ca ) TiO3 based dielectric for medium-high voltage application with X-ray , SEM and other analysis to find out the effect of contents of Pb,. Bi2O3 · nTiO2. n value, MnCO3 as additive. etc. on the microstructure and performance. The investigation results show that a series of different temperature characteristic ceramics of high dielectric strength and low loss can be obtained by adjusting content of Pb. content of Bi2O3 · nTiO2 and n value can be optimized , reduction of `dielectric loss and optimzation of dielectric constant can be achieved by adding appropriate MnCO3, the more . the lower the E at room temperature will be. Of the newly developed dielectrics ceramics, εr=2000 ,tgδ≤0.005. sample |△C/C |≤10%. Generally, its performances are good for medium-high voltage application.