MANUFACTURE OF ZINC OXIDE TYPE VARISTOR

摘要

PURPOSE:To obtain an element having large surge resistance and high varistor voltage per unit thickness by using silicon carbide as a starting material for the zinc oxide type varistor element. CONSTITUTION:Silicon carbide is employed as a starting material for a zinc oxide type varistor element in which zinc silicate is contained in a sintered body. When silicon carbide is used as the starting material, grinding progresses at rates quicker and more uniform than silicon carbide is employed, thus reducing the generation of voids in the sintered body while equalizing current distribution by the uniform distribution of zinc silicate. Accordingly, surge resistance is increased, and varistor voltage per unit thickness is raised.