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Sintering Effect on Pulse Aging Behavior of

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The effect of sintering temperature on pulse aging behavior of ZnO–V2O5–MnO2–Co3O4–Dy2O3–Nb2O5 varistors was investigated. The sintering temperature did have a significant effect on clamp ratio, which exhibits a pulse‐current handling capability. The varistors sintered at 900°C exhibited the best clamp characteristics, in which the clamp voltage ratio was in the range of K = 2.15–3.04 for the pulse‐current region (5–50 A). The varistors sintered at 950°C in the sintering temperature exhibited excellent electrical stability against a pulse‐current with %ΔE 1 mA/cm2 = 2.9%, %Δα = –19.6%, and %ΔJ L = 49.4% after applying the multi‐pulse‐current of 100 A.
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Document Type: Research Article

Publication date: August 1, 2011

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