Abstract
The electrical properties of ZnO varistor ceramics prepared with different sintering temperature were researched. The grain size of samples was homogeneous at sintering temperature 1160°C. The largest nonlinearity coefficient and least grain resistance were 75 and 0.3 Ω respectively, at 1160°C. The leakage current was reduced with increasing sintering temperature. The voltage gradient E 1mA 410V/mm acquired was good to optimize the ultra-high voltage arrestor structure. The optimized sintering temperature is 1160°C for giving ZnO varistors recipe.
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