Sinterless zinc oxide varistor devices

Details Sinterless zinc oxide varistor devices Sinterless zinc oxide varistor devices

B - Operations, Transporting

05

D

356/114

B05D 1/00 (2006.01)

Patent

CA 1143866

5D3717 SINTERLESS ZINC OXIDE VARISTOR DEVICES Abstract of the Disclosure Sinterless zinc oxide varistor devices are prepared in one embodiment by flame spraying premixed zinc oxide and additive metal oxide powders onto a refractory sub- strate. 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.

330905

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