摘要
研究了湿法合成ZnO压敏陶瓷材料的烧结缺陷.结果表明。随着烧结温度的提高,有两类微空洞型缺陷存在,它们分别由存在于晶粒表面的ZnO和晶界中的Bi_2O_3分解挥发产生,这种缺陷的存在是造成ZnO晶粒极向生长的主要原因。同时讨论了烧结缺陷的产生机理及其对压敏特性的影响。
The sintering defects in ZnO varistor ceramic were studied. With sintering temperature increasing, two types of holes 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 following action of Bi_2O_3 in the grain boundaries, both of which lead to polarized growth of ZnO grains. Furthermore, the mechanism of crystal growth, defect formation and its effects on eletrical-properties were also discussed.
出处
《材料导报》
EI
CAS
CSCD
北大核心
1999年第6期65-67,共3页
Materials Reports
基金
国家自然科学基金
河南省自然科学基金资助课题(No.19874017)
关键词
压敏陶瓷
湿法合成
烧结缺陷
氧化锌
ZnO varistor
wet chemical technique
sintering defect
