Manufacturing Methods of ZnO Varistors With High Surge Energy Capability

摘要

The present invention provides a method of manufacturing a ZnO varistor having a high surge energy tolerance. The present invention relates to a method for producing a composite oxide, comprising: blending an additive comprising bismuth oxide powder, antimony oxide powder, iron oxide powder, manganese oxide and alumina powder; Firstly pulverizing the blended additives; Mixing the powdered additive with zinc oxide powder to form a varistor raw material composition; Secondarily pulverizing the raw material composition; Molding the raw material composition; And sintering the molded body. The present invention also provides a method for producing a large-capacity zinc oxide varistor. According to the present invention, it is possible to manufacture a reliable zinc oxide varistor having a high surge energy capacity such as a direct-current lightning or high power electro-magnetic pulse (HPEMP).