Lateral high-resistance additive for zinc oxide varistor, zinc o

Details Lateral high-resistance additive for zinc oxide varistor, zinc o Lateral high-resistance additive for zinc oxide varistor, zinc o

1999-06-21

2000-01-25

Kopec, Mark

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

25251954, H01C 710, H01C 713

Patent

active

060182873

ABSTRACT:
The invention aims at providing highly reliable zinc oxide varistors through simple production steps. The varistor is produced by dispersing a powdery raw material comprising 1-40 molar % (in terms of Fe.sub.2 O.sub.3) iron, 0-20 molar % (in terms of Bi.sub.2 O.sub.3) bismuth, and the balance consisting of SiO.sub.2 in a solution of a water-soluble binder such as polyvinyl alcohol, and applying the formed dispersion to a molded or calcined zinc oxide varistor to form on the lateral face thereof a lateral high-resistance layer (2) containing Zn.sub.2 SiO.sub.4 as the principal ingredient and a solid solution of iron in Zn.sub.7 Sb.sub.2 O.sub.12 as the auxiliary ingredient.

REFERENCES:
patent: 4111852 (1978-09-01), Ho et al.
patent: 4500642 (1985-02-01), Reiji et al.
patent: 4933659 (1990-06-01), Imai et al.
patent: 5770113 (1998-06-01), Iga et al.

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