Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on the Microstructure and Electrical Characteristics of ZnO Varistor for d.c. Arrester

소결 조건 변화에 따른 직류 피뢰기용 ZnO 바리스터의 미세구조 및 전기적 성질에 관한 연구

  • 김석수 (한국전기연구원) ;
  • 최익순 (한국전기연구) ;
  • 박태곤 (창원대학교 전기전자제어공학) ;
  • 조이곤 (동아타이어공업(주) 절연물사업) ;
  • 박춘현 (동아타이어공업(주) 절연물사업팀)
  • Published : 2004.06.01

Abstract

The microstructure and electrical characteristics of A ∼ C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature was 1130 $^{\circ}C$ and speeds of pusher were A: 2 mm/min, B: 4 mm/min, C: 6 mm/min, respectively, were investigated. The experimental results obtained from this study were summarized as follows: The sintering density of A ∼C's ZnO varistors sintered at 1130 $^{\circ}C$ were decreased by sintering keep time to shorten, such as A: 9hour, B: 4.5hour and C: 3hour. A's ZnO varistor exhibited good densification nearly 98 % of theory density. In the microstructure, A∼C's ZnO varistors fabricated variable sintering condition was consisted of ZnO grain(ZnO), spinel phase(Z $n_{2.33}$S $b_{0.67}$ $O_4$), Bi-rich phasc(B $i_2$ $O_3$), wholly. Varistor voltage of A∼C's ZnO varistors sintered at 1130 $^{\circ}C$ increased in order A

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