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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 6    December 2009

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Sintering process as relevant parameter for Bi2O3 vaporization from ZnO-Bi2O3-based varistor ceramics
XU Dong(徐 东)1, CHENG Xiao-nong(程晓农)1, YAN Xue-hua(严学华)1,
XU Hong-xing(徐红星)1, SHI Li-yi(施利毅)2

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

Abstract:The relationship between sintering process and vaporization of the Bi2O3 in ZnO-Bi2O3-based varistor ceramics was investigated. The phase and microstructure evolution during the sintering process were examined. The results show that the higher the sintering temperature or the longer the sintering time is, the more the Bi2O3 is volatilized. The heating rate has little effects on the Bi2O3 volatilized in ZnO-Bi2O3-based varistor ceramics. This is in accordance with the relative X-ray diffraction peak area ratio analysis. The results also show that the sintering temperature has the greatest impact on the vaporization of the Bi2O3, then followed by sintering time, and the effect of the heating rate is the minimum.

 

Key words: varistor; ZnO; vaporization; sintering process; microstructure

ISSN 1672-7029
CN 43-1423/U

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