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J. Korean Ceram. Soc. > Volume 57(1); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(1): 65-72.
doi: https://doi.org/10.1007/s43207-019-00009-9
Effect of sintering temperature on nonlinearity and surge degradation characteristics of Mn3O4/ Nb2O5/Er2O3‑doped ZnO–V2O5‑based varistors
Choon‑W. Nahm
Department of Electrical Engineering, Semiconductor Ceramics Laboratory, Dongeui University, Busan 47340, Republic of Korea
Correspondence  Choon‑W. Nahm ,Email: cwnahm@deu.ac.kr
Received: September 16, 2019; Revised: November 10, 2019   Accepted: November 11, 2019.  Published online: January 31, 2020.
ABSTRACT
This study elucidates the effect of sintering temperature on the nonlinearity and surge degradation characteristics of Mn3O4/ Nb2O5/Er2O3–doped ZnO–V2O5-based varistors. With increasing sintering temperature, the average grain size increased from 6.3 to 16.6 μm and the ceramic density decreased from 5.51 to 5.41 g/cm3. The highest nonlinearity (α1 = 45.6) was obtained when the sintering temperature reached 900 °C. The sample sintered at 900 °C exhibited the best clamp characteristics, where the clamp voltage ratio was 1.84–2.44 at a surge current of 1–25 A. By contrast, the sample sintered at 925 °C exhibited the highest electrical stability, where ΔE 1 mA/cm2/E 1 mA/cm2 = −10.6% , Δα1∕α1 = −37.2% and ΔJL/JL = 10.2% after applying a surge current of 200 A.
Key words: Sintering · Nonlinear properties · Surge degradation characteristics · Varistors
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