Varistor with tetragonal antimony zinc oxide additive
AssigneeGeneral Electric Company
InventorJohn E. May
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Abstract
A low varistor voltage, low leakage metal oxide varistor and especially a zinc oxide varistor is provided by adding a few percent of tetragonal antimony zinc oxide to the varistor mixture prior to sintering. A method for manufacturing the additive as well as a method for manufacturing a varistor including the additive are described.
Claims5
An additive for reducing the varistor voltage and the leakage current of zinc oxide varistors consisting of particulate tetragonal-antimony-zinc-oxide of the form ZnSb.sub.2 O.sub.4.
A method for making a metal oxide varistor having low voltage and low leakage comprising combining zinc oxide as a major constituent, bismuth oxide and one or more other metal oxides as minor constituents, and a varistor voltage-reducing additive of less than 10 weight percent of particulate tetragonal ZnSb.sub.2 O.sub.4 having a particle size of less than about 50 microns;
- pressing said combination to form a body;
- and sintering said body at a temperature of about 1300.degree. C.
A metal oxide varistor having low varistor voltage and low leakage comprising zinc oxide as a major constituent, bismuth oxide and at least one other metal oxide as minor constituents, and a varistor voltage-reducing additive of from 0.1 to 10% by weight of particulate tetragonal ZnSb.sub.2 O.sub.4.
Dependencies are inferred from the claim text.