Fabrication method for high voltage zinc oxide varistor

Details Fabrication method for high voltage zinc oxide varistor Fabrication method for high voltage zinc oxide varistor

1989-11-02

1991-04-02

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 62, C04B 4181

Patent

active

050045733

ABSTRACT:
A method of producing a zinc oxide varistor for high voltage which is a voltage-current non-linear type of resistor including zinc oxide as the major ingredient and bismuth oxide or manganese dioxide as additives for use with a circuit protector and gapless arrester. The method of the invention includes sintering a zinc oxide composition lacking bismuth oxide at 1200.degree.-1350.degree. C. under conditions and for a period of time effective to form a primary sintered body, heat-treating a primary sintered body coated with an amount of metal oxide paste containing mostly bismuth oxide at a temperature of 1000.degree.-1200.degree. C. for a period of time effective to diffuse the metal oxide paste to the grain boundaries of the zinc oxide grains.

REFERENCES:
patent: 3723175 (1973-03-01), Masuyama et al.
Michio Matsuoka, "Nonohmic Properties of Zinc Oxide Ceramics", Japanese Journal of Applied Physics, vol. 10, No. 6, Jun. 1971, pp. 736-746.

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