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High-fluidity anti-tarnish casting silver-base alloy and preparation method thereof

A silver-based alloy with high fluidity technology, which is applied in the field of high-fluidity anti-tarnish casting silver-based alloy and its preparation, can solve the problems of poor oxidation resistance and achieve enhanced anti-tarnish performance, good anti-tarnish performance, and wide application foreground effect

Active Publication Date: 2018-08-17
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the analysis of the above documents, it can be seen that when adding elements such as silicon and tin, the content should not exceed a certain limit, otherwise it will lead to poor oxidation resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the silver-based alloy of the present invention, every 100g contains 97g of silver, 1g of zirconium, 1.0g of silicon and 1g of tin.

[0024] Its specific preparation process includes the following steps:

[0025] 1) Induction melting: weigh silver, zirconium, silicon and tin according to the above weight components, place them in a vacuum induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, and melt the materials by induction heating. Keep it warm for 20 minutes to purify the melt; to obtain a high-fluidity silver-based alloy, raise the temperature of the melt to 1250°C, then pour the melt into a mold and cool it in the furnace to form a base material.

[0026] 2) Quenching and tempering treatment: place the cooled base material in a tube-type atmosphere furnace, pass in a mixed gas of nitrogen and oxygen, control the flow rate ratio of nitrogen and oxygen to 5:1, and raise the temperature at a heating rate of 5°C / min to 600°C, heat preserv...

Embodiment 2

[0029] In the silver-based alloy of the present invention, every 100g contains 79g of silver, 7g of zirconium, 7g of silicon and 7g of tin.

[0030] Its specific preparation process includes the following steps:

[0031] 1) Induction melting: weigh silver, zirconium, silicon and tin according to the above weight components, place them in a vacuum induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, and melt the materials by induction heating. Keep it warm for 20 minutes to purify the melt; to obtain a high-fluidity silver-based alloy, raise the temperature of the melt to 1300°C, then pour the melt into a mold and cool it in the furnace to form a base material.

[0032] 2) Quenching and tempering treatment: place the cooled base material in a tube-type atmosphere furnace, pass in a mixed gas of nitrogen and oxygen, control the flow rate ratio of nitrogen and oxygen to 5:1, and raise the temperature to 600°C, heat preservation for 120min, and then cool...

Embodiment 3

[0035] In the silver-based alloy of the present invention, every 100g contains 85g of silver, 3g of zirconium, 7g of silicon and 5g of tin.

[0036] Concrete preparation process comprises the following steps:

[0037] 1) Induction melting: weigh silver, zirconium, silicon and tin according to the above weight components, place them in a vacuum induction melting furnace, evacuate until the pressure in the furnace is ≤1Pa, and melt the materials by induction heating. Keep it warm for 20 minutes to purify the melt; to obtain a high-fluidity silver-based alloy, raise the temperature of the melt to 1300°C, then pour the melt into a mold and cool it in the furnace to form a base material.

[0038] 2) Quenching and tempering treatment: place the cooled base material in a tube-type atmosphere furnace, pass in a mixed gas of nitrogen and oxygen, control the flow rate ratio of nitrogen and oxygen to 5:1, and raise the temperature to 600°C, heat preservation for 120min, and then cool wi...

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Abstract

The invention relates to a high-fluidity anti-tarnish casting silver-base alloy and a preparation method thereof. The high-fluidity anti-tarnish casting silver-base alloy comprises, by weight, 79-97%of silver, 1-7% of zirconium, 1-7% of silicon and 1-7% of stannum. The melting temperature of the silver-base alloy is 790-795 DEG C. The viscosity of the molten silver-base alloy is 0.5-0.7 Pa.s. Thefluidity length of a spiral linear test specimen is 93.7-95.9 cm. According to the high-fluidity anti-tarnish casting silver-base alloy and the preparation method thereof, the metallic elements zirconium, silicon and stannum are added to the silver, and a mixture is subjected to smelting to obtain a base material; the base material is subjected to quenching and tempering treatment, the complex physical and chemical reactions occur between the alloy elements and between the alloy elements and oxygen in an atmosphere to generate an alloy phase with the structural integrity and stable chemical property. Thus, the anti-tarnish performance of the silver-base alloy is substantially improved after the silver-base alloy is subjected to quenching and tempering treatment.

Description

technical field [0001] The invention belongs to a silver-based alloy material and a preparation method, in particular to a high-fluidity anti-tarnish casting silver-based 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. And the research work on the anti-tarnish silver alloy aspect has been carried out in the whole world, improves the anti-t...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C1/02C22F1/14C22F1/02
CPCC22C1/02C22C5/06C22F1/02C22F1/14
Inventor 黄前军蒋朝金谢兆凤李环尹涛蒋兆慧
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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