Nickel-free white gold alloy with reversible hardness characteri

Details Nickel-free white gold alloy with reversible hardness characteri Nickel-free white gold alloy with reversible hardness characteri

1997-11-17

1999-07-06

Ip, Sikyin

Metal treatment

Stock

Age or precipitation hardened or strengthened

148430, 420508, C22C 2706, C22C 502

Patent

active

059193204

ABSTRACT:
A hardenable white gold alloy consists essentially of about 55-60 % gold, about 12-20% silver, about 8-15% copper, about 8-18% palladium, about 0.0-1.0% tin, zinc indium or cobalt, and, optionally, about 0.005-0.02% iridium and/or ruthenium, and also about 0.01-0.03 weight percent lithium. The alloy is nickel-free, but has a pleasing white color similar to that of nickel-containing white gold alloys. The alloy has a fine grain structure, a lower hardness in its annealed condition, but is capable of being hardened to an exceptional hardness value. The hardening procedure is reversible.

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