Abstract
The sintering of ZnO+Bi2O3+Sb2O3 ceramics was studied. Usually, ZnO varistors have been sintered at a temperature higher than 1200°C, because Sb2O3 in the raw material retards sintering by evaporating at low temperature and forming Sb-compond thin films on ZnO surface. When Bi2O3 and Sb2O3 were mixed and heattreated beforehand and added to ZnO, the ZnO+Bi2O3+Sb2O3 could be sintered at about 900°C. During heattreatment with Bi2O3, Sb2O3 reacted with Bi2O3 and stopped sublimating, and the effect of sintering retardation was disappeared.
