Process for preparing silver-cadmium oxide alloys
AssigneeGTE Laboratories Incorporated
InventorsHan J. Kim, F. Joseph Reid
Life of this patent
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Abstract
This application describes the addition of an alkali metal, generally in the form of a salt thereof, to a mixture of silver and cadmium oxide, prior to the sintering step, to improve the as-sintered densities of the resultant alloy material.
Claims13
A method for preparing a silver-cadmium oxide alloy comprising forming a compact of silver particles, cadmium oxide particles and a density-increasing additive selected from the group consisting of the alkali metal and alkaline earth metal salts of nitric acid;
- heating said additive-containing compact to a temperature below the final sintering temperature for a period of time sufficient to decompose said additive;
- and then sintering said heated compact to form a silver-cadmium oxide alloy having improved sintered density as compared to alloys prepared without said additive.
The method for preparing a silver-cadmium oxide alloy comprising forming a compact comprising about 15% finely-divided cadmium oxide particles, about 85% finely-divided silver particles, and about 0.1 to about 0.2% lithium nitrate based upon the total weight of said silver and said cadmium oxide;
- heating said compact at about 600.degree.-700.degree.C for about 1-4 hours to decompose said lithium nitrate;
- and thereafter heating said compact at about 850.degree.-950.degree.C for about 1/2 - 2 hours to form a silver cadmium oxide alloy having an as-sintered density of about 99% of theoretical.
A method for preparing a silver-cadmium oxide alloy comprising forming a compact of about 70-95% silver particles, about 5-30% cadmium oxide particles, and about 0.05-0.5% of a density-increasing additive selected from the group consisting of the alkali metal and alkaline earth metal salts of nitric acid;
- heating said additive-containing compact to a temperature below the final sintering temperature for a period of time sufficient to decompose said additive;
- and then sintering said heated compact to form a silver-cadmium oxide alloy having improved sintered density as compared to alloys prepared without said additive.
Dependencies are inferred from the claim text.