Silver alloy compositions

a technology of silver alloys and compositions, applied in the field of silver alloy compositions, can solve the problems of less than desirable grain size properties, undesirable porosity of traditional alloys in recast metals, and characteristic firescale formation tendency, so as to reduce porosity and oxide formation, reduce grain size, and reduce firescale

Inactive Publication Date: 2006-07-06
ECCLES ANTHONY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008] The present invention aims to provide silver alloy compositions which substantially alleviate at least one of the foregoing disadvantages. A further object of the present invention is to provide silver alloys having the desirable properties of reduced fire scale, reduced

Problems solved by technology

Principal limitations include a characteristic firescale formation tendency attributable to oxidation of copper and other metals at the surface of cast or hot worked pieces.
Additionally, traditional alloys have exhibited undesirable porosity in the recast meta

Method used

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Examples

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Effect test

example 2

[0070] A firescale resistant, work hardening 925 silver alloy was prepared in accordance with the following formula, expressed as percentages by weight:

Zinc2.25Indium0.075Tin0.075Germanium0.125Boron0.003Silicon0.20Copper4.772Silver92.50

[0071] This alloy exhibited an as-cast Vickers hardness of approximately 15% greater than the firescale resistant alloy prepared without addition of germanium.

[0072] In use, alloys in accordance with the above embodiments the desired work hardening characteristics. The non-linear effect of use of germanium and the ability to vary other elements such as copper provides for production of a range of firescale resistant alloys of selected as-cast hardness ad work hardenability.

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Abstract

Fire-scale resistant, work-hardenable-jewelry, silver-alloy compositions having desirable properties of reduced fire scale, reduced porosity, oxide formation and reduced grain size relative to traditional sterling silver alloys while providing improved work hardening performance. These compositions contain at least 86% by weight silver, 0-5-7.5% by weight copper, 0.07-6% by weight of a mixture of zinc an silicon with silicon being present in an amount from about 0.02 to about 2.0% by weight, and from about 0.01 to no more than 2.0% by weight germanium.

Description

FIELD OF THE INVENTION [0001] This invention relates to silver alloy compositions. [0002] This invention has particular references to sterling silver alloy compositions of silver content of at least 92.5% for jewelry, flatware coinage and other applications where a work hardening alloy is required and for illustrative purposes reference will be made to this application. However, it is to be understood that this invention could be used to produce other types of silver alloys suitable for use as for example, electrical contacts or the like. BACKGROUND OF THE INVENTION [0003] In general, silver as a material for the production of silverjewellery, certain coinage and the like is specified to be sterling silver comprising at least 925 parts per thousand by weight fine silver and is specified as “0.925 silver”. 0.925 silver accordingly typically comprises an alloy 92.5% by weight silver, generally alloyed with copper for hardness traces of other metals as additives or impurities. [0004] C...

Claims

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Application Information

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IPC IPC(8): C22C5/08
CPCA44C27/003C22C5/06C22C5/08
Inventor ECCLES, ANTHONY
Owner ECCLES ANTHONY
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