Alloys or metallic compositions – Containing over 50 per cent metal but no base metal
Patent
1982-06-24
1983-10-25
Stallard, W.
Alloys or metallic compositions
Containing over 50 per cent metal but no base metal
420505, C22C 506
Patent
active
044118635
ABSTRACT:
A low-carat corrosion-resistant gold alloy which is not blacked in its skin surface color upon being cast is provided. The alloy is used as cast alloy for reparation of tooth crowns, as general decorative articles, or as contact alloy used in electrical apparatus. The alloy is composed essentially of gold, palladium and silver, with addition thereto of indium in place of copper contained in the conventional alloys, and necessary amounts of zinc or tin as deoxidant. Copper contents have been desired in view of improving the castability and mechanical strength of the alloy but the skin surface of the cast alloy may thereby be blacked to detract from aesthetic effects thus making it necessary to wash off the blacked oxide film by use of strong acid washing agents. The indium added in place of copper affords necessary mechanical properties to the alloy while providing aesthetically desirable silver to gray skin color and making the washing with strong acids unnecessary.
REFERENCES:
patent: 2716605 (1955-08-01), Schatz
patent: 3667936 (1972-06-01), Katz
patent: 3929475 (1975-12-01), Ingersoll
Maniwa Hideyo
Nishina Shinya
Otsuka Masasuke
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