Silver alloy and preparation method thereof

A technology of silver alloy and weight percentage, applied in the field of silver alloy and preparation, can solve the problem of poor sulfidation resistance of silver alloy, and achieve the effects of good sulfidation resistance, high ductility and good sulfidation resistance.

Inactive Publication Date: 2018-06-12
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases, after adding Y, the anti-sulfidation performance of silver alloy becomes worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the silver alloy of the present invention, every 100 g contains 99.6 g of silver, 0.1 g of magnesium, 0.1 g of aluminum, 0.1 g of manganese, and 0.1 g of yttrium.

[0026] Its specific preparation process includes the following steps:

[0027] 1) Weigh silver, magnesium, aluminum, manganese and yttrium according to the above weight components, place in a vacuum high-frequency induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, and fill it with argon until P=0.06MP, The material is melted by induction heating, and the temperature is kept at 1300°C for 20 minutes to fully alloy the melt, and then the melt is poured into the mold and cooled in the furnace to form a base material.

[0028] 2) Quenching and tempering treatment: put the cooled base material in the atmosphere furnace, control the flow rate of oxygen to flow into the atmosphere furnace at 20ml / min, raise the temperature to 450°C at a heating rate of 5°C / min, keep it warm for 120min...

Embodiment 2

[0031] In the silver alloy of the present invention, every 100 g contains 93.5 g of silver, 2 g of magnesium, 2 g of aluminum, 2 g of manganese, and 0.5 g of yttrium.

[0032] Its specific preparation process includes the following steps:

[0033] Weigh silver, magnesium, aluminum, manganese and yttrium according to the above weight components, place in a vacuum high-frequency induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, fill with argon until P=0.06MP, and heat by induction Melt the material, hold it at 1300°C for 20 minutes to fully alloy the melt, then pour the melt into the mold and cool it in the furnace to form the base material.

[0034] 2) Quenching and tempering treatment: put the cooled base material in the atmosphere furnace, control the flow rate of oxygen to flow into the atmosphere furnace at 20ml / min, raise the temperature to 450°C at a heating rate of 5°C / min, keep it warm for 120min, and then Cool to obtain a silver alloy.

...

Embodiment 3

[0037] In the silver alloy of the present invention, every 100 g contains 95.4 g of silver, 0.1 g of magnesium, 2 g of aluminum, 2 g of manganese, and 0.5 g of yttrium.

[0038] Concrete preparation process comprises the following steps:

[0039] Weigh silver, magnesium, aluminum, manganese and yttrium according to the above weight components, place in a vacuum high-frequency induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, fill with argon until P=0.06MP, and heat by induction Melt the material, hold it at 1300°C for 20 minutes to fully alloy the melt, then pour the melt into the mold and cool it in the furnace to form the base material.

[0040] 2) Quenching and tempering treatment: put the cooled base material in the atmosphere furnace, control the flow rate of oxygen to flow into the atmosphere furnace at 20ml / min, raise the temperature to 450°C at a heating rate of 5°C / min, keep it warm for 120min, and then Cool to obtain a silver alloy.

[...

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Abstract

The invention relates to silver alloy and a preparation method thereof. The silver alloy is composed of, by weight, 93.5-99.6% of silver, 0.1-2% of magnesium, 0.1-2% of aluminum, 0.1-2% of manganese and 0.1-5% of yttrium. The elongation at break of the silver alloy is larger than 47%, the Vickers hardness after cold work is subjected to plastic deformation is larger than or equal to 53%, and the silver alloy is invariant in color within at least 72 hours when placed in an Na2S water solution of 0.1 M under room temperature. The silver alloy has high ductility and cold hardening, the metallic luster of the silver alloy can be kept for a long term under a sulfuration atmosphere condition after being subjected to thermal refining, and the silver alloy has good anti-sulfuration performance andbroad application prospects.

Description

technical field [0001] The invention relates to a silver alloy and a preparation method. Background technique [0002] Silver is the most widely distributed element among precious metals, containing twenty times more than gold. Adding other alloying elements to silver can improve the performance of silver, such as copper can increase the hardness of silver, lower the melting point, and improve castability. Therefore, silver alloy materials are widely used in jewelry, silverware, photography, electrical and electronic, electroplating and medical industries, and are also increasingly used in high-tech industries. However, long-term use of silver alloy materials is prone to vulcanization and discoloration, which affects the appearance and use. However, research work on anti-tarnish silver alloys has been carried out all over the world to improve the anti-sulfurization performance, ductility and cold work hardening of silver alloys under low-cost conditions, but with little ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C1/02C22F1/02C22F1/14
CPCC22C5/06C22C1/02C22F1/02C22F1/14
Inventor 蒋朝金黄前军谢兆凤李环尹涛蒋兆慧
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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