Metallic oxide resistive bodies having a nonlinear volt-ampere characteristic and method of fabrication

摘要

An electrically resistive body best suited for providing varistors of high surge withstanding capability and high nonlinearity coefficient over a wide range of current magnitudes. The resistive body is composed of a major proportion of metallic oxides including zinc oxide, bismuth trioxide, antimony trioxide, cobaltous oxide, magnesium oxide, manganous oxide, and boric oxide. To these major ingredients there are added minor proportions of boric oxide and aluminum oxide, or of boric oxide and spinel. For the fabrication of such resistive bodies, the mixture of the noted ingredients in finely divided form are molded into desired shape and size, and the moldings are sintered.