Metal treatment – Stock – Noble metal base
Patent
1998-08-18
2000-10-31
Sheehan, John
Metal treatment
Stock
Noble metal base
148430, 420506, 420501, C22C 506
Patent
active
061396524
ABSTRACT:
A fine silver alloy composition having at least about 99.5 weight percent silver, with the balance containing an element, or an oxide of an element, selected from the group consisting of: aluminum, antimony, cadmium, gallium, germanium, indium, lithium, manganese, magnesium, silicon, tin, titanium and zinc, the alloy composition having been formed by combining silver having a purity of at least about 99.90 weight percent with an element, or an oxide of an element, selected from the group, in a substantially non-oxidizing atmosphere. The alloy composition may be annealed in a substantially non-oxidizing atmosphere. The silver alloy composition may be hardened by internal oxidation. The composition is capable of being aged hardened to at least 136 percent of its annealed hardness, and this hardening may be irreversible. The composition may be resistant to tarnishing, and may have an aged hardness of at least about 48 VHN. The internal oxidation may be furthered by heating the alloy to a temperature of between about 800.degree. F. and 1300.degree. F. in an oxygen-containing atmosphere. The oxygen-containing atmosphere may contain at least about 20% oxygen. The non-oxidizing atmosphere may be about 75 weight percent hydrogen and about 25 weight percent oxygen. The non-oxidizing annealing atmosphere may be a reducing atmosphere.
REFERENCES:
patent: 5171643 (1992-12-01), Suzuki et al.
ASTM Designation B4 13-97a, "Standard Specification for Refined Silver", pp. 323 and 324, Apr. 1997.
Metals Handbook, "Properties of Silver and Silver Alloys", vol. 2, pp. 662 and 671-674, 1979.
Raykhtsaum, A. et al., "The New Gold Color Reference Kit Takes the Guesswork Out of Describing Gold Color", pamphlet entitled AJM, Gold: Showing its true colors, Oct. 1994.
Handy & Harman, "Silver, The Handy Book of Silver", 18 pages, 1996.
Carrano Richard V.
Mondillo Ronald A
Mondillo Ronald
Rosenblatt Gregory S.
Sheehan John
Stern-Leach
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