Method of improving varistor upturn characteristics

Details Method of improving varistor upturn characteristics Method of improving varistor upturn characteristics

1978-05-15

1980-08-26

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

252518, 252521, 264104, C04B 3564

Patent

active

042195187

ABSTRACT:
A method for producing varistors exhibiting improved upturn characteristics comprises controllably heating a pressed varistor powder mix to a temperature, and for a time, sufficient to form a ceramic material, and then quenching the ceramic material at a rate in excess of approximately 500.degree. C. per hour. The method is particularly advantageous when dopants such as aluminum, antimony, indium, and gallium are employed. Additionally, a surge arrester is disclosed comprising a varistor connected in series with a spark gap, the varistor being produced in accordance with the aforementioned quenching method.

REFERENCES:
patent: 3903226 (1975-09-01), Iga et al.
patent: 3953371 (1976-04-01), May
patent: 4094061 (1978-06-01), Gupta et al.

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