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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Influence of Sintering Temperature on Electrical Properties of ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-La_2O_3$ Based Varistors

ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-La_2O_3$계 바리스터의 전기적 특성에 소결온도의 영향

  • 류정선 (동의대학교 전기공학과) ;
  • 김향숙 (동의대학교 전기공학과) ;
  • 남춘우 (동의대학교 전기공학과)
  • Published : 2001.11.08
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Abstract

The electrical properties of ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-La_2O_3$ based varistors were investigated with sintering temperature in the range of $1240\sim1300^{\circ}C$. The varistors sintered at $1240\sim1260^{\circ}C$ exhibited high density, which was 5.50- $5.70g/cm^3$ corresponding to 95.2~98.6% of theoretical density. The varistor voltage was decreased in range of 718.47~108.00 V/mm with increasing sintering temperarture. The varistors sintered at $1240\sim1260^{\circ}C$ exhibited good electrical properties, in which the nonlinear exponent is in the range of 79.25~49.22 and leakage current is in the range of 0.26~$1.00 {\mu}A$ In particular, the varistor sintered at $1240^{\circ}C$ showed very excellent electrical properties, in which the nonlinear exponent is 79.25 and leakage current is $0.26{\mu}A$

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