Patent ID: 8216544
Filing Date: 2012-07-10
Classification: C04B,H01B,H01C,Y10T

Abstract:
1. A varistor powder that is dispersed in a polymer matrix to obtain a composite used for electric field relaxation, wherein the main ingredient is zinc oxide (ZnO); at least bismuth (Bi), cobalt (Co), manganese (Mn), antimony (Sb), nickel (Ni), and aluminum (Al), calculated as Bi the zinc oxide (ZnO) content is greater than or equal to 90 mol %; the bulk density is greater than or equal to 2.5 g/cc; the powder is a spherical powder in which the 50% particle diameter in the particle size distribution is 20 μm to 120 μm; the particle size deviation in the particle size distribution ((86% particle diameter−16% particle diameter)/2) is greater than or equal to 15 μm; and the ZnO primary crystal mean particle diameter is less than or equal to 10 μm.