Varistor material and method of producing same

Details Varistor material and method of producing same Varistor material and method of producing same

H - Electricity

01

C

356/114, 31/174

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

Patent

CA 2021188

VARISTOR MATERIAL AND METHOD OF PRODUCING SAME Abstract A varistor material is disclosed which has a composition consisting essentially of 93-97 mole % of ZnO and 3- 7 mole % of MnO, a non-linear coefficient .alpha. of at least 20 and such a bulk density as to provide a porosity of greater than 15 % but not greater than 50 %, wherein the porosity is defined as follows: Porosity (%) = (1 - d/d0) x 100 wherein d represents the bulk density and d0 represents the theoretical density of the single phase pure ZnO. The varistor material is produced by sintering a mixture containing ZnO powder and 3-7 mole %, based on ZnO + MnO, of a manganese compound at a temperature of 1100-1350 °C under a condition so that the resulting sintered body has the above porosity.

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