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Fastness and hard silver alloy

A silver alloy and anti-tarnish technology, which is applied in the field of anti-tarnish and hard silver alloys, can solve the problems that the cost cannot be reduced and the effect of anti-sulfurization has not been improved, so as to reduce production costs, have obvious anti-tarnish effect, and improve hardness and the effect of anti-tarnish ability

Inactive Publication Date: 2005-07-27
HONG KONG PRODUCTIVITY COUNCIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this still can not reduce the cost, and the anti-vulcanization effect has not been improved;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 46.25 grams of silver and 3.75 grams of copper, heat them in a graphite crucible to melt them, pass a protective gas over the crucible to prevent the metal from being oxidized; heat the silver and copper to 1050°C, then stir to make them Mix evenly, then lower the temperature, anneal at 500°C to make it harden, and finally pour it into cold water to cool; #, 4000# sandpaper, then polish in a magnetic polishing machine for 30 minutes, then use ultrasonic waves to clean in acetone solvent for 30 minutes, then rinse with distilled water, and dry with paper towels; the hardness of the alloy is measured with a micro hardness tester ; Finally, do a vulcanization test for 48 hours, and the vulcanization test is carried out in accordance with the standard method ISO4583-1978 (E).

[0019] When characterizing the characteristics of silver alloys, the CIELab unit is used to express the color of metallic silver, L * Represents the brightness on the black-white axis (ie L *...

Embodiment 2

[0021] Weigh 46.25 grams of silver and 3.75 grams of germanium, heat them in a graphite crucible to melt them, and pass a protective gas over the crucible to prevent the metal from being oxidized; heat the silver and germanium to 1050°C, then stir to make them Mix evenly, then lower the temperature, anneal at 300°C, make it harden, and finally pour into cold water to cool; the surface of the hard silver alloy made is ground and polished as described in Example 1, and the surface is treated; then measure the hardness and make Vulcanization test, and finally measure the color difference. The hardness and color difference of this silver alloy are 120.5HV and 19.3 respectively.

Embodiment 3

[0023] Weigh 46.25 grams of silver, 2.00 grams of germanium and 1.75 grams of copper, heat them in a graphite crucible to melt, and pass a protective gas over the crucible to prevent the metal from being oxidized; silver, germanium and copper are heated to 1100 ℃, then stir to make it evenly mixed, then lower the temperature, anneal at 600 ℃, make it harden, and finally pour it into cold water to cool; Processing; measure the hardness again, do the vulcanization test, and finally measure the color difference. The hardness and color difference of this silver alloy are 126.5HV and 34.5 respectively.

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PUM

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Abstract

The invention discloses a fastness and hard silver alloy comprising 92.5-98.0% metal silver by weight and 2.0-7.5% other components by weight, the other components contain 0.02-7.5% germanium by weight, 0.1-7.5% copper by weight, 0.2-4.0% tin by weight, 0.01-0.5% samarium by weight, 0-5.0% indium by weight, 0-0.05% boron by weight, 0-5.0% zinc by weight, 0-1.0% manganese by weight, 0-1.5% nickel by weight, 0-0.1% silicon by weight, and 0-0.09% zirconium by weight. The silver alloy of the invention has a high rigidity and a fastness performance, can be used for producing jewelry, coins, silver dishwares, medals, etc.

Description

technical field [0001] The present invention relates to a silver alloy, especially an anti-tarnish and hard silver alloy. Background technique [0002] Silver and silver alloys have been loved by people since ancient times because of their unique luster effect, antibacterial properties and relatively low cost, and are widely used in the manufacture of jewelry, tableware and various decorations. However, whether it is pure silver products or silver electroplating products, due to the sulfur contained in the air or human saliva, these silver products are easily corroded and discolored. Silver and hydrogen sulfide (H 2 S) A chemical reaction occurs to form dark silver sulfide (Ag sulfide) on the silver surface. 2 S), and as the reaction deepens, the silver sulfide layer is constantly thickened, making the silver surface slowly change from the original bright silver to yellow, then brown, and finally black. In addition, silver is relatively soft, and sterling silver products ...

Claims

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Application Information

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IPC IPC(8): C22CC22C5/06
Inventor 杨利坚徐润昌林咏霞诸晓平
Owner HONG KONG PRODUCTIVITY COUNCIL
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