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Abstract
Varistors, materials that change their resistance with voltage, are very used devices in the industry to protect electric and electronic equipment of the voltage surges. Given the current demands of the technology, varistors is required that cover a wide range of rupture voltage, mainly low voltage values, quick answer, good behavior in service and with simple microstructure that facilitates its conformation. In this work is indicated how to obtain the raw material to fabricate SnO2 based varistors by polymeric precursor method. The obtained ceramic powder was characterized using X ray diffraction (XRD) and thermal analysis (DTA/TG). To determine their densification were made dilatometric studies, sinterized samples were microstructural(SEM), and electrically characterized to determine the current-voltage characteristics curves of the studied systems.
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