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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국전기전자재료학회 전기전자재료학회논문지 전기전자재료학회논문지 제17권 제6호
발행연도
2004.1
수록면
683 - 689 (7page)

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The microstructure and electrical characteristics of A~C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature was 1130 ℃ and speeds of pusher were A: 2㎜/min, B: 4 ㎜/min, C: 6 ㎜/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 ℃ 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(Zn2.33Sb0.67O4), Bi-rich phase(Bi2O3), wholly. Varistor voltage of A~C's ZnO varistors sintered at 1130 ℃ increased in order A〈B〈C's ZnO varistors. C's ZnO varistor exhibited good characteristics that nonlinear exponent was 31.70. Leakage current of A~C's ZnO varistors exhibited below 2 ㎃ at rated voltage. Lightning impulse residual voltage of A's ZnO varistor suited standard characteristics, which was 3.85㎸ at 2.5㎄, 4.4 ㎸ at 5㎄ and 5.16 ㎸ at 10 ㎄. After continuous lightning impulse current test of A's ZnO varistor exhibited good discharge characteristics which ZnO varistor reveals no evidence of puncture, flashover, cracking in visual examination. After high current impulse test of A's ZnO varistor exhibited good discharge characteristics, which variation rate of residual voltage was 0.4 % before and after test, and revealed no evidence.

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