保温时间对氧化锌压敏瓷组织和电性能的影响  

Effect of Sintering Time on Microstructure and Electrical Properties of ZnO Varistor Ceramics

作　　者：史小锋[1] 樊曰娥[1] 徐东[1,2] 程晓农[1] 施利毅[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]上海大学纳米科学与技术研究中心,上海200444

出　　处：《河南科技大学学报（自然科学版）》2010年第6期5-8,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：中国博士后科学基金项目(20100471380);上海市教育委员会重点学科建设项目(J50102);江苏省普通高校自然科学研究项目(10KJD430002);江苏大学本科生创新计划项目(2010002)

摘　　要：采用不同的保温时间制备ZnO压敏电阻,通过扫描电镜和X射线衍射对其显微组织和相成分进行了分析,探讨了保温时间对氧化锌压敏电阻电性能和显微组织影响机理。保温时间的变化对压敏瓷的相成分基本没有影响。适当的延长保温时间,压敏瓷的晶粒发育越好,晶粒尺寸越大越均匀;过长的保温时间会导致压敏瓷的晶粒粗大。保温时间的延长,压敏瓷的漏电流变化不大,致密度和电位梯度逐渐减小。研究结果表明:当保温时间为2 h时,压敏瓷具有较为理想的综合电性能,其电位梯度为332V/mm,非线性系数为30,漏电流为0.1μA。ZnO varistor ceramics were sintered by using different sintering time,and the electrical properties and microstructure of the varisotr ceramics were studied in this paper.The sintering time hardly affects the microstructural phases.Proper prologing sintering time is useful for the grains,but when the sintering time is too long,the grains become coarse and the properties will decrease.With increasing sintering time,the leakage current has little change,the threshold voltage and the density decrease gradually.The results show when the sintering time are 2 h,ZnO varistor ceramics exhibit comparatively ideal comprehensive electrical properties such as the threshold voltage 332 V/mm,the nonlinear coefficient 30 and the leakage current 0.1 μA.

关 键 词：压敏电阻 氧化锌 保温时间 电性能 显微组织 

分 类 号：TQ174.6[化学工程—陶瓷工业]