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以金属离子盐为原料,氨水、乙醇胺为沉淀剂,十二烷基苯磺酸钠、聚乙二醇2000为表面改性剂,采用共沉淀法制备ZnO基纳米复合粉体。以共沉淀法最佳工艺所得粉体制备高压ZnO压敏电阻。采用热重–差示扫描量热分析、X射线衍射、扫描电子显微镜、激光粒径分析对ZnO基复合前驱体及ZnO基纳米复合粉体进行表征,探讨了沉淀剂种类、溶液pH值、Zn2+起始浓度和表面改性剂对粉体粒度的影响。结果表明:以氨水为沉淀剂、溶液体系pH值为6.0、Zn2+浓度为1.0mol/L、聚乙二醇2000为表面改性剂时可制备出粒径分布窄、平均粒径为89nm的ZnO基复合粉体。用该粉体制备的高压ZnO压敏电阻的平均电位梯度为543V/mm,非线性系数为29.3,漏电流为49μA。通过共沉淀工艺,可制备出电性能优良的高压ZnO压敏电阻。
Using metal ion salt as raw material, ammonia and ethanolamine as precipitants, sodium dodecyl benzene sulfonate and polyethylene glycol 2000 as surface modifiers, ZnO-based nanocomposite powders were prepared by coprecipitation method. Coprecipitation method to obtain the best powder obtained high pressure ZnO varistor. The ZnO-based composite precursors and ZnO-based nanocomposite powders were characterized by TG-DTA, XRD, SEM and laser particle size analysis. The effects of precipitant, pH value, Zn2 + Effect of Initial Concentration and Surface Modifier on Particle Size. The results show that when ammonia is used as precipitating agent, the pH value of the solution is 6.0 and the concentration of Zn2 + is 1.0mol / L, polyethylene glycol 2000 is used as the surface modifier to prepare ZnO with narrow particle size distribution and average particle size of 89nm Base composite powder. The average potential gradient of high voltage ZnO varistor prepared by this powder is 543V / mm, the nonlinear coefficient is 29.3 and the leakage current is 49μA. Through coprecipitation process, high voltage ZnO varistors with excellent electrical properties can be prepared.