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US 5,296,259 AGranted
Process for making electrically conductive patterns
AssigneeE. I. Du Pont de Nemours and Company
InventorsDietmar Dudek, Thomas Pfeiffer
Life of this patent
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Abstract
A process for making an electrically conductive pattern on a substrate comprising coating the substrate with a solution of salts containing at least one supplementary element, drying and heat treating the salt coating at a temperature lower than the temperature at which oxides form from the salts, then forming a metal conductive pattern on the heat treated supplementary element coating. This process can be used to make printed circuits on ceramic substrates which are useful in hybrid circuits, for example.
Claims8
A process for making an electrically conductive pattern on a substrate comprising:
- (a) coating the substrate with a solution comprising a salt of a supplementary element or a mixture thereof, wherein the supplementary elements are selected from the group consisting of bismuth, cadmium, lead, copper, boron, rhodium, nickel, indium, aluminum, and silicon;
- (b) drying the coated substrate;
- (c) heating the dried substrate to a temperature lower than the temperature at which a supplementary element oxide forms;
- (d) forming on the heat treated substrate a patterned adhesive layer that is at least temporarily tacky;
- (e) applying a powder comprising metal to the patterned adhesive layer;
- and
- (f) firing the patterned substrate at a temperature and time sufficient to remove the adhesive layer and sinter the powder.
4 more elements
Dependencies are inferred from the claim text.