MANUFACTURE OF CHIP VARISTOR

摘要

PURPOSE:To improve the reliability of a chip varistor in quality by making the film thickness of glass films uniform so as to reduce the fraction defective caused by the deterioration in insulation resistance of the glass films at the time of forming the glass films on the surfaces of sintered bodies. CONSTITUTION:A sintered body 4 is formed by alternately piling up ceramic semiconductor layers 2 and inner electrodes 3 and sintering the laminated body. Then glass frit classified to a uniform particle size and the sintered bodies 4 are housed in a container and heated to a temperature equal to or higher than the softening point of the glass frit while the container is rotated. Therefore, glass films 7 having a uniform film thickness can be formed on the surface of the sintered bodies 4.