High surge energy capability and deterioration stability in ZnO varistors: role of sintering and post-heat-treatment conditions
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This study investigates a ZnO varistor exhibiting both high energy-handling capability and exceptional stability under hightemperatureconditions. The results indicate that the sintering temperature and subsequent post-heat-treatment significantlyaffect the varistor's energy capacity and resistance to degradation. A systematic investigation of the microstructural andphase transformations induced by varying thermal processing conditions revealed that specimens sintered at 1200 °C andpost-annealed at 600–800 °C achieved optimal performance, primarily due to grain boundary stabilization and the formationof beneficial intergranular phases.
Abstract
This study investigates a ZnO varistor exhibiting both high energy-handling capability and exceptional stability under hightemperatureconditions. The results indicate that the sintering temperature and subsequent post-heat-treatment significantlyaffect the varistor's energy capacity and resistance to degradation. A systematic investigation of the microstructural andphase transformations induced by varying thermal processing conditions revealed that specimens sintered at 1200 °C andpost-annealed at 600–800 °C achieved optimal performance, primarily due to grain boundary stabilization and the formationof beneficial intergranular phases.