Nickel-free white gold alloys

Details Nickel-free white gold alloys Nickel-free white gold alloys

C - Chemistry, Metallurgy

22

C

C22C 5/00 (2006.01) C22C 5/06 (2006.01)

Patent

CA 2123438

NICKEL-FREE WHITE GOLD ALLOYS ABSTRACT A white gold alloy composition consisting essentially of about 35 to 50 weight percent of gold, about 35 to 63 weight percent of silver, about 0.1 to 7 weight percent of a whitening component of zinc, germanium or both, and palladium in an amount of about 9 weight percent or less. The whitening component and the palladium are present in an amount sufficient to impart a white gold appearance and a liquidus temperature of no greater than about 1950°F to the alloy, preferably between about 1700 and 1900°F, and more preferably less than about 1850°F. Thus, the preferred amount palladium is about 2 to 5 weight percent and the preferred amount of the whitening component is about 0.5 to 6 weight percent.

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