Abstract
The effect of sintering temperature on clamping characteristics and pulse aging behavior of V2O5/MnO2/Nb2O5 co-doped zinc oxide varistors was systematically investigated at 875–950°C. Experimental results related to varistor effect showed that the breakdown field decreased dramatically from 6830 to 968V/cm with the increase in the sintering temperature and the non-ohmic coefficient exhibited a maximum (49.5) at 900°C in the sintering temperature. Varistors sintered at 900°C exhibited the best clamp characteristics for the pulse current of 1–100A, with the clamp voltage ratio of K=1.86–2.77. Varistors sintered at 875°C exhibited the strongest stability; variation rates for the breakdown field, for the non-ohmic coefficient, and for the leakage current density were −14.2%, −63.6%, and 59.0%, respectively, after application of a multi-pulse current of 100A.
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