$Sb_2O_3$가 첨가된 고전압 ZnO 바리스터의 미세 구조 및 전기적 특성

The Microstructure and Electrical Characteristics of High Voltage ZnO Varistors with $Sb_2O_3$Additive

  • 오수홍 (광주기능대학 전기과) ;
  • 정우성 (전남대학교 전기공학과) ;
  • 홍경진 (전남대학교 전기공학과) ;
  • 이진 (목포대학교 제어계측공학과) ;
  • 김태성 (전남대학교 전기공학과)
  • 발행 : 2000.07.01

초록

ZnO varistor is studied to sintering condition and mixing condition for the improvement to non linear of electrical characteristics. In this paper, ZnO varistor, ZnO-Bi$_2$O$_3$-Y$_2$O$_3$-MnO-Cr$_2$O$_3$-Sb$_2$O$_3$series, is fabricated with Sb$_2$O$_3$mol ratio(0.5~4[mol%]) and sintered at 1250[$^{\circ}C$] for 2 hours. The grain size to Sb$_2$O$_3$moi ratio was measured by fractal mathematics. The ZnO varistors that Sb$_2$O$_3$mot ratio is 1[mol%] were shown small grain size because of spinel phase. The fractal dimension were increased with increasing of Sb$_2$O$_3$mo ratios. The capacitance of ZnO varistors with increasing of Sb$_2$O$_3$additive in voltage-capacitance characteristics was decreased by small grain size.

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