Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Electrical Properties with variation of ZnO Varistors with added of $Nd_2O_3$

$Nd_2O_3$를 첨가한 ZnO Varistor의 전기적 특성

  • Cho, Hyun-Moo (Dep. of Electrical Electronic Engineering Seonam Univ.) ;
  • Lee, Sung-Gap (Dep. of Electrical Electronic Engineering Seonam Univ.)
  • 조현무 (서남대학교 전기전자공학부) ;
  • 이성갑 (서남대학교 전기전자공학부)
  • Published : 2004.07.05
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Abstract

ZnO varistor ceramics were fabricated with variation of addition of $Nd_2O_3$ amount and the sintering temperature was $l150^{/circ}C$. The average grain sizes were showed decreased from $13.8{\mu}m$ to $4.7{\mu}m$, and varistor voltages were increased from 398 V to 657 V by added amount of $Nd_2O_3$. Nonlinear coefficient a of all were with increasing the amount of $Nd_2O_3$ more than 60, in case of added on 0.1mol% $Nd_2O_3$ was 87. And leakage current were less than $1_{\mu}A$ with applied at 82% of varistor voltage. The clamping voltage ratio of the specimes added 0.1mol% $Nd_2O_3$ was 1.38 at applied 25A [$8/20{\mu}s$]. In the specimen added 0.1mol% $Nd_2O_3$, endurence of surge current and deviation of varistor voltage were 7000A/$cm^2$, $\Delta-2.08%$, respectively.

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