Gold-silver alloys with good tarnish resistance for the dental art

Gold-silver alloys with good tarnish resistance for the dental art are prepared which, contrary to the known tarnish resistant alloys, still contain copper and thus have a deeper gold color and a high ductility. The alloys contain 33 to 48% gold, 0-5% platinum, 1-10% palladium, 0-0.2% iridium and/or...

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Bibliographische Detailangaben
Hauptverfasser:	KROPP, RUDOLF
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE METALLURGY PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Gold-silver alloys with good tarnish resistance for the dental art are prepared which, contrary to the known tarnish resistant alloys, still contain copper and thus have a deeper gold color and a high ductility. The alloys contain 33 to 48% gold, 0-5% platinum, 1-10% palladium, 0-0.2% iridium and/or ruthenium, 3-9% copper, 1-6% zinc, 0.5-4% tin and 2.5-10% indium, balance silver, wherein the mass ratio of copper to zinc is between 1:1 and 4:1, the content of copper is not higher than the sum of zinc, tin and indium, the content of palladium is at most three times as great as that of indium and does not exceed the sum of zinc, tin and indium. Under these provisions the copper content is not perceptibly disadvantageous to the resistance to discoloration.