ZnO varistor manufactured by composite nano-additives

Based on the analysis of the effects of ZnO grain boundaries, the new method of manufacturing ZnO varistors prepared by composite nano-additives is put forward in this paper. The emphasis of this technique is mainly on improving the microstructural uniformity and the effects of ZnO varistors grain boundaries so as to obtain the high quality components. As a result of the experiment, fine and active multiplex composite nano-additives are prepared by chemical coprecipitation, and highly uniform microstructure and larger surge absorption capability compared with the conventional oxide mechanical mixed technique are achieved. Moreover, this method is easy to perform and the shape of the obtained powders is apt to control. Also this new technique of manufacturing ZnO varistors is more feasible and of great prevalence in spawning ceramic materials among the existing equipments. (C) 2002 Published by Elsevier Science B.V.