US2008166260A1PendingUtilityA1

Silver Alloy Compositions

Assignee: CARRS OF SHEFFIELD MFG LTDPriority: Apr 7, 2005Filed: Feb 3, 2006Published: Jul 10, 2008

Est. expiryApr 7, 2025(expired)· nominal 20-yr term from priority

Inventors:Frederic Faverjon Alan G. Hopkinson James Storey

C22C 5/06C22C 1/06C22C 5/08C22C 1/03

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References

Claims

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.

Claims

exact text as granted — not AI-modified

1 . 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.   
     
     
         2 . The composition as claimed in  claim 1  further comprising:
 0.15%-1.5% aluminium.   
     
     
         3 . The composition as claimed in  claims 1  or  2  further comprising:
 0.01%-0.15% magnesium.   
     
     
         4 . The composition as claimed in any preceding claim further comprising:
 0.01%-0.1% nickel.   
     
     
         5 . The composition as claimed in any one of  claims 1  to  3  further comprising:
 0.05%-0.35% nickel.   
     
     
         6 . The composition as claimed in any one of  claims 1  to  3  further comprising:
 less than 0.05% nickel.   
     
     
         7 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% copper.   
     
     
         8 . The composition as claimed in any one of  claims 1  to  6  further comprising:
 0.01%-0.2% copper.   
     
     
         9 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% manganese.   
     
     
         10 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% iron.   
     
     
         11 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% silicon.   
     
     
         12 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% boron.   
     
     
         13 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% titanium.   
     
     
         14 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% iridium.   
     
     
         15 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.35% cobalt.   
     
     
         16 . The composition as claimed in any preceding claim further comprising:
 0.05%-0.25% lithium.   
     
     
         17 . The composition as claimed in any preceding claim further comprising
 0.02%-0.3% phosphorous.   
     
     
         18 . The composition as claimed in any preceding claim comprising:
 92.5%-93.5% silver.   
     
     
         19 . The composition as claimed in any one of  claims 1  to  17  comprising:
 96.8% silver.   
     
     
         20 . A silver alloy composition comprising by weight:
 at least 92.5% silver   &gt;0%-5% tin   &gt;0%-5% zinc   &gt;0%-2% indium   &gt;0%-3% aluminum   &gt;0%-2% magnesium.   
     
     
         21 . The composition as claimed in  claim 20  further comprising:
 0.1%-0.2% copper.   
     
     
         22 . The composition as claimed in  claim 21  further comprising:
 0.01%-0.1% nickel.   
     
     
         23 . A silver alloy composition comprising by weight:
 at least 92.5% silver   &gt;0%-5% tin   &gt;0%-5% zinc   &gt;0%-2% indium   &gt;0%-3% aluminum   &gt;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.   
     
     
         24 . The composition as claimed in  claim 23  wherein said composition comprises any one of said grain refiners within the range 0.05%-0.35% by weight. 
     
     
         25 . The composition as claimed in  claims 23  or  24  further comprising:
 0.1%-0.2% copper.   
     
     
         26 . The composition as claimed in  claim 25  further comprising:
 0.01%-0.1% nickel.   
     
     
         27 . 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.   
     
     
         28 . The composition as claimed in  claim 27  further comprising:
 0.1%-0.2% copper; and   0.01%-0.1% nickel.

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