Metal oxide varistor made by a co-precipation process and freeze

Details Metal oxide varistor made by a co-precipation process and freeze Metal oxide varistor made by a co-precipation process and freeze

1983-06-22

1985-09-10

Envall, Jr., Roy N.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

29610R, 264 61, 252518, H01C 710, H01B 108

Patent

active

045409714

ABSTRACT:
A metal oxide varistor is disclosed which a component of grain bodies comprised of zinc oxide and a component of grain boundary layers comprised of another metallic oxide, containing metal other than zinc wherein at least a portion of these starting materials comprised a fine particle powder prepared by a co-precipitatin method.
The metal oxide varistor of the present invention is excellent in varistor characteristics such as non-linearity to voltage, life performances and capability of energy dissipation, is small in a scatter of the above characteristics between manufacture lots or within each lot at the time of manufacture, and has a good quality stability. Unexpected results are obtained when the co-precipitated fine particles are subjected to a refrigeration-dehydration type process.

REFERENCES:
patent: 4097392 (1978-06-01), Goldman et al.
patent: 4142996 (1979-03-01), Wong et al.
patent: 4318995 (1982-03-01), Rhodes et al.
patent: 4372865 (1983-02-01), Yu et al.
Sato, IEEE Transactions of Magnetics, Dec. 1970.
Thomson, Jr., Am. Ceram. Soc. Bull., 53,421, 1974.
Tasaki, Bulletin of the Ceramic Society of Japan, No. 11, 1981.

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