Alloys or metallic compositions – Copper base – Zinc containing
Patent
1989-07-10
1991-05-28
Dean, R.
Alloys or metallic compositions
Copper base
Zinc containing
420485, C22C 900, C22C 904, C22C 906
Patent
active
050193350
ABSTRACT:
The present invention provides an improved casting alloy for use in costume jewelry and jewelry samples. In accordance with the present invention, a gold colored metal alloy is disclosed which is tarnish resistant and consists of the following ingredients such as, 75 to 85% copper, 5 to 15% nickel, 0 to 12% indium, and 0 to 12% zinc. It is also desirable to add approximately 0.01% iron and/or 0.05% silicon to act as a grain refiner and fluidity enhancer respectively. The alloy in accordance with the subject invention is a rich gold color which approximates a fourteen carat alloy. In addition, tarnish resistance and workability is greatly increased.
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Thews, "Melting and Casting of German Silver Alloys", FIAT Final Report 878, Office of Military Government for Germany (US), Jul. 23, 1946, p. 18.
Beiser Robert S.
Dean R.
Schumaker David W.
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