Preparing doped zinc oxide varistor ceramic powders by copercipitation-coating process

The research results of preparing zinc oxide varistor ceramic powders by coprecipitation process show that the coprecipitation coating process obtained constant components more easily than the ion mixing coprecipitation process, and displayed excellent performances. By means of further investigating of coprecipitation conditions temperature, the surfactants and the degree of agitation, the optimal coprecipitation conditions were determined. Varistors prepared by coprecipitation chemical method display electrical properties leak current 50 μA, strike out voltage 180 V/mm and the biggest non linearity coefficient 44.