摘要
采用高能球磨的方法制备了ZnO和添加物(MnO,Sb2O3,CoO,Cr2O3,Bi2O3)的前驱超细粉体,采用固相反应烧结技术在1 140℃进行2 h烧结制备出ZnO陶瓷变阻器。用SEM,XRD研究了不同退火温度对ZnO压敏陶瓷的显微形貌、相结构,伏安非线性特性和微观电性能的影响。从阻抗分析,激活能和介电损耗与频谱关系分析证明了600～800℃热处理时晶界由于β-Bi2O3向γ-Bi2O3的相变引起的体积膨胀而变宽,导致晶界电子陷阱浓度降低,从而使得势垒高度下降,漏电流增加。
The superfine powders of ZnO and composite oxides （MnO, Sb2O3, CoO, Cr2O3, Bi2O3） were ground with high energy ball milling. Then the ZnO ceramic varistors were prapared by sintering at 1140 ℃ for 2h using solid state reaction technology. The effect of different annealing temperature on microstructure, phase texture, nonlinear property and micro electric properties were studied using SEM and XRD. Impedance test, activation energy test and dissipation factor-frequency spectrum dependence analisis proved that at heat treatment of 600-800 ℃ grain boundary widened caused by volume expansion due to β-Bi2O3 phase transition to γ-Bi2O3, leading to the reducing of grain boundary electron trap concentration,making the barrier height drop, and leakage current increase.
出处
《电瓷避雷器》
CAS
北大核心
2009年第5期28-32,35,共6页
Insulators and Surge Arresters
基金
国家自然科学基金资助项目(10876041和气075218)
上海市产业技术创新重大项目(07XI-023)
863项目(2006AA03Z437)
