Method of fabricating non-linear voltage limiting device

Details Method of fabricating non-linear voltage limiting device Method of fabricating non-linear voltage limiting device

1981-07-27

1984-10-02

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264235, 264346, H01B 108

Patent

active

044747187

ABSTRACT:
A non-linear voltage limiting device displaying a particular stability characteristic and designed to eliminate flashover failure across its circumferential edge is disclosed herein along with a specific method of fabrication. The voltage limiting device is characterized by a rising resistive current with time at predetermined temperature and voltage levels and includes a disc-shaped wafer composed primarily of zinc oxide. In accordance with the method disclosed herein, after this wafer is formed and sintered in accordance with prescribed temperature and time requirements, its circumferential edge is provided with an anti-flashover coating which requires curing. Thereafter, the coated wafer is annealed in a way which cures the coating and, at the same time, reduces and preferably minimizes the resistive current rise characteristic referred to above.

REFERENCES:
patent: 3925261 (1975-12-01), Dammler
patent: 4046847 (1977-09-01), Kresge
patent: 4165351 (1979-08-01), May
patent: 4180483 (1979-12-01), Ho
patent: 4254070 (1981-03-01), Yodogawa et al.
patent: 4272411 (1981-06-01), Sokoly
patent: 4349496 (1982-09-01), Levinson

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