Silver-copper-germanium alloys having high oxidation resistant m

Details Silver-copper-germanium alloys having high oxidation resistant m Silver-copper-germanium alloys having high oxidation resistant m

1977-06-24

1978-11-07

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75134G, 75173R, C22C 500

Patent

active

041243803

ABSTRACT:
A silver-copper-germanium base alloy is disclosed consisting by weight of 40 to 85% silver, 15 to 60% copper and 0.1 to 10% germanium. Optionally, up to 15% by weight of the base alloy may be replaced with tin and up to 10% by weight of at least one of gold, palladium and platinum. The presence of germanium in the alloy virtually eliminates oxidation of the melt during the melting and casting of the alloy and thereby also improves resistance to tarnishing when the alloy is used in an oral environment.

REFERENCES:
patent: 1963085 (1934-06-01), Gray
patent: 2196302 (1940-04-01), Hensel et al.
patent: 3811876 (1974-05-01), Harigaya
patent: 3997330 (1976-12-01), Aliotta

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