脉冲形成线用CaO-TiO_2-Al_2O_3基介质陶瓷介电性能  

Dielectric properties of CaO-TiO_2-Al_2O_3 based ceramics for pulse forming line

作　　者：陈莹[1] 董显林[1] 张文斌[1] 李鑫[1] 江峰[1] 谌怡[2] 刘毅[2] 夏连胜[2] 王根水[1] 石金水[2] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2016年第4期75-78,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金项目(U1530156);中国工程物理研究院科学技术发展基金项目(2013A0402018)

摘　　要：设计了一种脉冲形成线用新型CaO-TiO2-Al2O3 基介质陶瓷体系,采用传统固相法通过优化组分和制备工艺,调控材料的微结构,获得了介电性能优异的介质陶瓷.其介电常数在15～35之间可调,介电损耗小于0.002,频率稳定性好.在厚度为1mm 时,介电强度高达50kV/mm.研究了厚度对CaO-TiO2-Al2O3基介质陶瓷介电强度的影响规律,当厚度从1mm 减小到0.1 mm 时,介电强度呈非线性增大,从50kV/mm（1mm 厚样品）提高到92kV/mm（0.1mm 厚样品）,可见,CaO-TiO2-Al2O3 基介质陶瓷的电击穿与其机械损坏具有相似性.结合CaO-TiO2-Al2O3 基介质陶瓷的化学组分和微观结构,CaO-TiO2-Al2O3 基介质陶瓷优越的电击穿特性可以用弱点击穿理论解释.A new CaO-TiO_2-Al_2O_3 based dielectric ceramic system is designed for pulse forming line application.The dielectric ceramic is prepared by traditional solid state method and its microstructure was controlled by optimizing the composition and preparation process.The dielectric ceramic exhibits an excellent dielectric properties.The frequency stability of the dielectric constant is good.The dielectric loss is less than 0.002 in a wide frequency range.The electric strength is up to 50kV/mm(1mm in thickness).The influence of thickness on the electric strength of CaO-TiO_2-Al_2O_3 based dielectric ceramics is studied.With the thickness decreasing from 1mm to 0.1mm,the dielectric breakdown strength increases nonlinearly from 50kV/mm to 92kV/mm.So it can be seen that the dielectric breakdown of the CaO-TiO_2-Al_2O_3 dielectric ceramics is similar to their mechanical damage.Based on the chemical compositions and the microstructures,the dielectric breakdown mechanism of CaO-TiO_2-Al_2O_3 dielectric ceramics can be explained by the weak breakdown theory.

关 键 词：CaOTiO2Al2O3 脉冲形成线 介质陶瓷 介电性能 介电强度 

分 类 号：TB34[一般工业技术—材料科学与工程] TM281[电气工程—电工理论与新技术]