Zinc phosphate coating for varistor
First Claim
Patent Images
1. A nonlinear resistive element comprising:
- a body having stacked zinc oxide semiconductor layers;
a generally planar electrode between each pair of said layers, each said electrode having a contactable portion that is exposed for electrical connection;
plural spaced electrically conductive metal end terminations, each of said end terminations being on an end portion of said body for contacting at least one said contactable portion;
an electrically insulative material substantially coating said body between said end terminations said material consisting substantially of zinc phosphate; and
an electrically conductive metal coating said end terminations.
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Abstract
Method of providing a semiconductor device with an inorganic electrically insulative layer, the device having exposed semiconductor surfaces and electrically conductive metal end terminations, in which the device is reacted with phosphoric acid to form a phosphate on the exposed surfaces of the semiconductor but not on the metal end terminations, and in which the device is thereafter barrel plated in a conventional electrical barrel plating process and the plating is provided only on the end terminations because the phosphate is not electrically conductive.
24 Citations
11 Claims
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1. A nonlinear resistive element comprising:
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a body having stacked zinc oxide semiconductor layers; a generally planar electrode between each pair of said layers, each said electrode having a contactable portion that is exposed for electrical connection; plural spaced electrically conductive metal end terminations, each of said end terminations being on an end portion of said body for contacting at least one said contactable portion; an electrically insulative material substantially coating said body between said end terminations said material consisting substantially of zinc phosphate; and an electrically conductive metal coating said end terminations. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A nonlinear resistive element comprising:
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a disc zinc oxide varistor; end terminations on opposing surfaces of said disc varistor for making electrical contact; and an electrically insulating layer consisting substantially of zinc phosphate covering said disc varistor, except said end terminations. - View Dependent Claims (8, 9, 10, 11)
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Specification