ZINC OXIDE VARISTOR, MANUFACTURE THEREOF, AND ARRESTER USING ITS ZINC OXIDE VARISTOR

摘要

PROBLEM TO BE SOLVED: To provide a zinc oxide varistor having a high varistor voltage and excellent flatness, and provide a compact arrester having a small leakage current and a long life by using the zinc oxide varistor. ;SOLUTION: This zinc oxide varistor is manufactured by firing and sintering a zinc oxide varistor composition containing zinc oxide as the principal component and bismuth oxide, through a temperature raising process 1, a temperature holding process 2 and a temperature lowering process 3. Firing and sintering are performed in an atmosphere with oxygen partial pressure 4 of 1atm or greater in all the processes 1, 2 and 3, or in the temperature holding process 2.;COPYRIGHT: (C)1997,JPO