Sinterless zinc oxide varistor devices

Details Sinterless zinc oxide varistor devices Sinterless zinc oxide varistor devices

1978-05-26

1980-04-15

Beck, Shrive P.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

338 20, 427 88, 427101, 427103, 427105, 427271, 427277, 427423, 427425, B05D 100, B05D 108

Patent

active

041984439

ABSTRACT:
Sinterless zinc oxide varistor devices are prepared in one embodiment by flame spraying premixed zinc oxide and additive metal oxide powders onto a refractory substrate. The coated substrate is then treated by an abrasive removal process to form a trimmable resistor. A further embodiment comprises the use of a plasma spray process wherein carbonates and nitrates of the varistor constituents are oxidized in situ by entrainment within an oxygen gas stream and directing the plasma upon a rotating substrate. Ultra pure zinc oxide varistor devices having excellent electrical properties can be prepared in this manner.

REFERENCES:
patent: 2671735 (1954-03-01), Grisdale et al.
patent: 3437974 (1969-04-01), Spiegler
patent: 3640757 (1972-02-01), Grubba
patent: 3698936 (1972-10-01), Moltzan
patent: 3759739 (1973-09-01), Varlas
patent: 3903494 (1975-09-01), May
patent: 3984591 (1976-10-01), Plumat et al.

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