Metal oxide varistor

Details Metal oxide varistor Metal oxide varistor

H - Electricity

01

C

356/114

H01C 7/10 (2006.01) H01C 7/112 (2006.01)

Patent

CA 1194611

Abstract: Metal oxide varistor Disclosed is a metal oxide varistor which comprises; a sintered body containing a) ZnO as a principal component, and b), as auxiliary components, Bi, Co and Mn in amounts of 0.05 ? 2 mole %, 0.05 ? 2 mole % and 0.05 ? 2 mole %, when calculated in terms of Bi2O3, Co2O3 and MnO2, respectively, and at least one selected from A?, In and Ga in amounts of 1 x 10-4 ? 3 x 10-2 mole %, when calculated in terms of A?2O3, In2O3 and Ga2O3, respectively; said sintered material having been reheated at a temperature of 650 ? 900°C after sintering; and a non-diffusible electrode provided on said sintered body. The metal oxide varistor has excellent pulse response and volt-ampere non-linearity even with respect to a pulse having a short rise time of less than a microsecond.

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