Gold alloy for firing on porcelain for dental purposes
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorHelmut Knosp
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Abstract
Gold alloys for firing on porcelain for dental purposes are prepared from 60 to 90 weight % gold, 5 to 35 weight % platinum, 0.1 to 3 weight % indium, 0 to 10 weight % palladium, 0.5 to 3 weight % rhodium, 0 to 3 weight % tin, 0.1 to 2 weight % tantalum and/or tungsten and 0.3 to 2 weight % zinc, the weight ratio of the platinum group metals to zinc to tantalum and/or tungsten are 15-30:1:0.5-1.3.
Claims11
A gold alloy suitable to have porcelain fired thereon consisting of 60 to 90% gold, 5 to 35% platinum, 0.1 to 3% indium, 0 to 10% palladium, 0 to 3% tin, 0.5 to 3% rhodium, 0.1 to 2% of at least one member of the group consisting of tantalum and tungsten, and 0.3 to 2% zinc, the weight ratio of the platinum group metals to zinc to said member being 15-30:1:0.5-1.3.
Dependencies are inferred from the claim text.