Surge stability improvement of zinc oxide varistor discs

Details Surge stability improvement of zinc oxide varistor discs Surge stability improvement of zinc oxide varistor discs

1991-04-23

1993-11-23

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264235, C04B 4180, B29C 7100

Patent

active

052641694

ABSTRACT:
A method of manufacturing a varistor utilizes preselected amounts of ZnO which are combined with specified amounts of additives including B, Na, Bi.sub.2 O.sub.3 and BaO to form a variety of compositions. Each composition is pressed into a disc. The disc is then sintered at a first selected temperature. Afterwards, the disc is annealed at a second selected temperature. The specific compositions disclosed render a varistor with improved high temperature performance when the annealing step is followed with a low temperature tempering cycle at approximately 250.degree. C.

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patent: 4219518 (1980-08-01), Philipp
patent: 4243622 (1981-01-01), Kresge
patent: 4725807 (1988-02-01), Tsuda et al.
patent: 5165351 (1979-08-01), May

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