VOLTAGE NON-LINEAR RESISTIVE CERAMICS

摘要

Voltage non-linear resistive ceramics having large voltage non-linear coefficient as well as higher overvoltage protection capacity is produced by calcining a mixture which is composed of zinc oxide as a main ingredient and a variety of elements as minor ingredients in the form of elements or compounds. As minor ingredients of the ceramic, a predetermined amount of praseodymium, cobalt, potassium, chromium and at least one of magnesium and calcium are added, thereby providing voltage non-linear resistive ceramics having much less leakage current and increased overvoltage protection capacity.