Silver Alloy Compositions
AssigneesCarrs of Sheffield (Manufacturing) Limited, Sheffield Hallam University, Centre Stephanois De Recherches Mecaniques
InventorsFrederic Faverjon, Alan G. Hopkinson, James Storey
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Abstract
Silver alloy compositions having reduced susceptibility to sulphidation and reduced susceptibility to fire stain relative to 92.5% silver 7.5% copper alloy, and having mechanical properties for casting and forming comparable to or better than 92.5% silver 7.5% copper alloy, and having an appearance similar to 92.5% silver 7.5% copper alloy. The silver alloy compositions include at least 92.5% silver 2.0%-4.0% tin; 1.7%-2.6% zinc and 0.50%-1.5% indium.
Claims28
A sterling silver alloy composition comprising by weight:
- at least 92.5% silver
- 3.0%-4.0% tin
- 1.7%-2.6% zinc
- 0.5%-1.5% indium.
The composition as claimed in any preceding claim further comprising:
- 0.01%-0.1% nickel.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% copper.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% manganese.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% iron.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% silicon.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% boron.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% titanium.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% iridium.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.35% cobalt.
The composition as claimed in any preceding claim further comprising:
- 0.05%-0.25% lithium.
The composition as claimed in any preceding claim further comprising
- 0.02%-0.3% phosphorous.
The composition as claimed in any preceding claim comprising:
- 92.5%-93.5% silver.
A silver alloy composition comprising by weight:
- at least 92.5% silver
- >0%-5% tin
- >0%-5% zinc
- >0%-2% indium
- >0%-3% aluminum
- >0%-2% magnesium.
A silver alloy composition comprising by weight:
- at least 92.5% silver
- >0%-5% tin
- >0%-5% zinc
- >0%-2% indium
- >0%-3% aluminum
- >0%-2% magnesium
- wherein any remaining weight % is silver and/or any one or a combination of the following grain refiners:
- copper;
- manganese;
- iron;
- nickel;
- silicon;
- boron;
- titanium;
- iridium;
- cobalt.
A sterling silver alloy composition comprising by weight:
- 92.5%-93.5% silver
- 2.5%-3.5% tin
- 2.0%-3.0% zinc
- 0.3%-1.1% indium
- 0.2%-0.8% aluminium
- 0.03%-0.1% magnesium.
Dependencies are inferred from the claim text.