Varistor formed of bismuth and antimony and method of manufactur

Details Varistor formed of bismuth and antimony and method of manufactur Varistor formed of bismuth and antimony and method of manufactur

1994-09-29

1997-01-07

Evans, Geoffrey S.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

H01C 710

Patent

active

055921400

ABSTRACT:
The varistor element contains zinc-oxide as a main constituent and at least bismuth and antimony as accessory constituents. The content of bismuth in the form of Bi.sub.2 O.sub.3 is in a range from about 0.1 to 4.0 mol % and the content of antimony in the form of Sb.sub.2 O.sub.3 constitutes a mol-ratio of Sb.sub.2 O.sub.3 /Bi.sub.2 O.sub.3 less than or equal to about 1.0 mol %. These materials are mixed thoroughly and are pressed into a compact. After coating both sides of the compact with Ag or Ag--Pd paste, the compact and its electrodes are sintered simultaneously at a temperature of about 800.degree. C. to 960.degree. C.

REFERENCES:
patent: 5075666 (1991-12-01), Radford
patent: 5369390 (1994-11-01), Lin et al.

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