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

한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
권호 표지

희토류 금속 산화물 첨가에 따른 ZnO varistor의 전기적 특성

Electrical properties of the ZnO varistors with the amount of rare-earth metal oxide addition

  • 조현무 (서남대학교 전기전자공학부) ;
  • 이종덕 (서남대학교 전기전자공학부) ;
  • 박상만 (서남대학교 전기전자공학부)
  • Cho, Hyun-Moo (Dep. of Electrical Electronic Engineering of SeoNam Univ.) ;
  • Lee, Jong-Deok (Dep. of Electrical Electronic Engineering of SeoNam Univ.) ;
  • Park, Sang-Man (Dep. of Electrical Electronic Engineering of SeoNam Univ.)
  • 발행 : 2005.07.07
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초록

ZnO varistor ceramics were fabricated as a function of the amount of $Y_2O_3$ addition and sintered at $1250^{\circ}C$ for 2 hour. The average grain size was decreased from 14.2 ${\mu}m$ to 8.3 ${\mu}m$ with the amount of $Y_2O_3$ addition, and varistor voltage was increased from 433 V to 563 V with $Y_2O_3$ addition. Nonlinear coefficient a of all specimens were increased with the amount of $Y_2O_3$ more than 67, in case of $Y_2O_3$ 0.01wt% addition showed the excellent results of 87. And leakage current was less than $1{\mu}A$ at 82% of varistor voltage. The clamping voltage ratio of the specimens added 0.01wt% $Y_2O_3$ was 1.41 at 25A [8/20${\mu}s$]. At the specimen 0.01wt% $Y_2O_3$ addition. endurance of surge current and deviation of varistor voltage were 5700A/$cm^2$ and $\Delta$-2.86%, respectively.

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