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Cupronickel alloy and manufacturing method thereof for coinage

A technology of cupronickel and alloy, which is applied in the field of cupronickel alloy for coinage and its preparation, can solve the problems of unsatisfactory corrosion resistance, spalling, and high nickel content of the alloy, and achieve enhanced silvery white luster, improved corrosion resistance, and improved corrosion resistance. The effect of abrasive properties

Active Publication Date: 2012-08-01
甘肃和宏新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's nickel resources are in short supply. Nickel is an expensive strategic resource. It is economically inappropriate to process nickel into metal circulation coins due to the high cost of materials.
The problems existing in the production of metal circulation coins by stamping with steel core materials are: first, the coating on the surface of the steel core is easy to wear and peel off, which affects the appearance and circulation life
There are the following problems in using this alloy as the base material of circulating coins: first, the nickel content is high, and the manufacturing cost is high; second, the corrosion resistance of the alloy is not ideal; third, the cutting performance of the alloy is poor, which affects subsequent coin making

Method used

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  • Cupronickel alloy and manufacturing method thereof for coinage
  • Cupronickel alloy and manufacturing method thereof for coinage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put Cu with a mass percentage of 46% into a power frequency furnace for smelting. After the copper starts to soften, cover a layer of charcoal on the copper surface. The amount of charcoal is 15-25kg per ton of copper. The melting temperature is 1180-1210°C. Add 8.3% Ni by mass to the molten copper, so that nickel metal can be dissolved into the copper liquid through alloying. After Ni is melted, 0.5% Al and 15% Cu are added to the molten copper; by adding cold copper and aluminum at the same time, the heat of dissolution of aluminum can be used to melt the cold copper to reduce energy consumption and The purpose of metal burning. After the added Al and Cu are melted, add 17.0% Zn by mass percentage to the copper liquid; adopt the purpose of adding aluminum first and then add zinc, can use low-priced metal aluminum to deoxidize the copper liquid, and use aluminum on the surface of the copper liquid A dense aluminum oxide protective film is formed to reduce the copper...

Embodiment 2

[0048] Put Cu with a mass percentage of 50% into a power frequency furnace for smelting, and after the copper starts to soften, cover a layer of charcoal on the copper surface. The amount of charcoal is 15-25kg per ton of copper. The melting temperature is 1180-1210°C. Add 9.2% Ni by mass percentage to the molten copper liquid, and add 0.7% Al and 14.5% Cu by mass percentage to the copper liquid after Ni is melted. After the added Al and Cu are melted, add 18.0% Zn by mass percentage to the copper liquid; after the metal Zn is melted, add Cu-Mn and Cu-Ti master alloy to the copper liquid to make the Mn and Ti in the finished alloy The mass percent is 4.0% and 2.2%; Add Cu-Sb master alloy in copper liquid, make the mass percentage of Sb in the finished alloy be 0.3%; Add Cu-Fe master alloy in copper liquid, make the mass percentage of Fe in the finished alloy The percentage is 0.7%;

[0049] After the added master alloy is melted, use high-purity nitrogen or argon as carrier...

Embodiment 3

[0052] Put Cu with a mass percentage of 55% into a power frequency furnace for smelting. After the copper starts to soften, cover a layer of charcoal on the copper surface. The amount of charcoal is 15-25kg per ton of copper. The melting temperature is 1180-1210°C. Add 10.2% Ni by mass percentage to the molten copper liquid, and add 0.9% Al and 14.5% Cu by mass percentage to the copper liquid after Ni is melted. After the added Al and Cu are melted, add 20.0% Zn by mass percentage to the copper liquid; after the metal Zn is melted, add Cu-Mn and Cu-Ti master alloy to the copper liquid to make the Mn and Ti in the finished alloy The mass percentages are 5.0% and 2.5%; add Cu-Sb master alloy to the copper liquid to make the mass percentage of Sb in the finished alloy be 0.5%; add Cu-Fe master alloy to the copper liquid to make the mass percentage of Fe in the finished alloy The percentage is 0.9%;

[0053] After the added master alloy is melted, use high-purity nitrogen or ar...

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Abstract

The invention discloses a cupronickel alloy for coinage. The cupronickel alloy comprises elements of, by mass, 8,0 to 10.0 percents of Ni, 16.0 to 19.0 percents of Zn, 3.0 to 5.0 percents of Mn, 1.8 to 2.5 percents of Ti, and 0.5 to 0.9 percent of Fe; and 0.3 to 0.7 percent of Al, 0.2 to 0.5 percent of Sb, no more than 0.9 percent of impurities, and the balance copper. According to the cupronickel alloy and the manufacturing method thereof, low price metal Zn, Mn, Al are used to replace precious metal Ni, thereby production and manufacture cost of the copper-based metal circulation currency can be greatly reduced; subsequent processing performance of production and manufacture of the metal circulation currency is improved by adding trace amounts of Sb; abrasion resistance performance of the metal circulation currency is improved by adding trace amounts of Fe; and abrasion resistance performance of the metal circulation currency is improved, and attractiveness and silver luster sensation of the metal currency are enhanced by adding alloy elements such as Al, Ti and the like.

Description

technical field [0001] The invention relates to copper and copper alloy processing, belongs to the technical fields of metal material alloying, material anticorrosion and alloy smelting, and in particular relates to a white copper alloy for coinage and a preparation method thereof. Background technique [0002] Metal coins have a high degree of cleanliness, carry less germs, and are beneficial to people's health; coins are wear-resistant, have a long circulation cycle, lower issuance costs, save resources, and promote the use of coins to benefit the country and the people. Since the founding of our country, nickel coins, steel coins, aluminum coins and copper coins have been used. my country's nickel resources are in short supply. Nickel is an expensive strategic resource. It is not economically appropriate to process nickel into metal circulation coins due to the high cost of materials. The problems of adopting steel core material to emboss to manufacture metal circulation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/03
Inventor 贺永东杨志强
Owner 甘肃和宏新材料有限公司
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