Varistors with upturn at high current level

Details Varistors with upturn at high current level Varistors with upturn at high current level

1979-07-26

1981-08-25

Miller, Edward A.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252518, 252521, 252512, H01B 106

Patent

active

042858399

ABSTRACT:
A method for producing varistors and varistor powder is disclosed in which the zinc oxide powder is predoped with certain desired impurities in order to keep these impurities out of the intergranular phase which is known to exist in sintered metal oxide varistors. In particular, certain trivalent dopants are added to increase the zinc oxide grain conductivity without the usually concomitant increase in higher leakage current. In particular, the method disclosed herein is especially important for the doping of varistor material with aluminum at low levels of concentration.

REFERENCES:
patent: 3089856 (1963-05-01), Cyr et al.
patent: 3264229 (1966-08-01), Klein
patent: 3538022 (1970-11-01), Bowman
patent: 3551356 (1970-12-01), Bowman
patent: 3723175 (1973-03-01), Masuyama et al.

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