共沉淀法制备ZnO压敏陶瓷的烧结缺陷研究

A Study of Sintering Defects in ZnO Varistor Ceramic Fabrecated By Coprecipitation

本文研究了共沉淀法制备ＺｎＯ压敏陶瓷材料烧结缺陷的特点及其对压敏特性的影响．结果表明，晶粒表面所形成的微空洞主要由ＺｎＯ的分解挥发产生，晶界的微空洞则主要是由富集于晶界处的Ｂｉ２Ｏ３分解挥发产生．并对这两类烧结缺陷的形成进行了初步讨论．

The sintering defects of ZnO varistor ceramic have been studied. With sintering temperature increasing, two types of defects were found in such marterials. One is due to the decomposition and volatilization of ZnO on the grains surface, and the other is due to the such action of Bi 2O 3 in the grain boundaries, both of which lead to polar growth of ZnO grains. Furthermore, its mechanism and effects on eletrical properties have been discussed.