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http://dx.doi.org/10.4313/JKEM.2005.18.9.815

Electrical Properties of ZnO Varistors with Variation of Glass Addition  

Cho, Hyun-Moo (서남대학교 전기전자공학부)
Lee, Jong-Deok (서남대학교 전기전자공학부)
Park, Sang-Man (서남대학교 전기전자공학부)
Lee, Sung-Gap (국립 경상대학교 세라믹공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.18, no.9, 2005 , pp. 815-820 More about this Journal
Abstract
ZnO varistor ceramics were fabricated with variation of addition of glass-frit amount and the sintering temperature was $1100^{\circ}C$. The average grain sizes were showed increased from $8.6{\mu}m\;to\;10{\mu}m$, and varistor voltages were decreased from 506V to 460V by added amount of glass-frit. Nonlinear coefficient $\alpha$, of all were with increasing the amount of glass-frit more than 70, in case of added on $0.03wt\%$ glass-frit was 83. And leakage current were less than $1{\mu}A$ with applied at $82\%$ of varistor voltage. The clamping voltage ratio of the specimens added $0.03wt\%$ glass-frit was 1.41 at applied 25A $[8/20\;{\mu}s]$. In the specimen added $0.03wt\%$ glass-frit, endurance of surge current and deviation of varistor voltage were $6200A/cm^2,\;\Delta-1.67\%$, respectively and clamping voltage ratio was 2.33. In the Specimen added $0.03wt\%$ glass-frit were superior to any other compositions on High Temperature Load Test(HTLT) for 1000 hr at $85^{\circ}C$, and deviation of the varistor voltage were $\Delta-1.29\%$.
Keywords
Glass-frit; Nonlinear coefficient; Endurance surge current; High temperature load lest;
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