JPH01290727A - Imitation gold - Google Patents

Abstract

PURPOSE:To obtain the title imitation gold having a rich golden tone, excellent in workability and not discoloring in the atmosphere by specifying the Cr content in an alloy consisting essentially of Cu and contg. Al, Mn, Ni, Fe, and Cr. CONSTITUTION:About 0.44-3.33wt.% Cr, based on the total weight, is incorrporated into an alloy consisting essentially of Cu and contg. Al, Mn, Ni, Fe, and Cr to obtain imitation gold having workability equivalent to that of stainless steel, having a rich golden tone, and not discoloring in the atmosphere. An alloy contg. 86.900-84.000% Cu, 6.610-6.650% Al, 1.890-2.325%Mn, 3.700% Ni, and 0.44-3.325% Cr, and wherein a part of the Cu contains Fe or especially an alloy contg. 82.23% Cu, 6.25% Al, 2.00% Mn, 3.7% Ni, 2.5% Fe, and 3.33% Cr is appropriately used as the alloy. The alloy is obtained by adding Cr to Cu at about 1,650 deg.C, mixing both metals, then slightly lowering the temp., and mixing both metals without vaporizing other alloy components.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to an all-imitation alloy having a golden color.

"Prior Art" Aluminum bronze has been used as a golden alloy for a wide range of purposes since ancient times. However, because it easily discolors in the atmosphere, it is not used for decorations, vessels, and construction materials.Therefore, imitation gold, trade name Brace Gold, was developed using an alloy consisting of the ingredients shown in Table 1. Attempts were made to use it as a material for industrial use, but the problem arose that it was hard, had poor workability, and was prone to discoloration.

Table 1 "Problems to be Solved by the Invention" In order to obtain imitation gold that is highly workable and free of discoloration, the present invention experimentally investigated the uniform crystallization of Cr into an alloy state with respect to Cu. Conventionally, it was a common sense opinion that C could not be mixed with Cu, but the above experiment showed that C could not be mixed with Cu.
A u-Cr alloy was obtained, and the above results were achieved.

"Means for solving the problem" In order to achieve the above object, the uninvented material is mainly made of Cu, Al, Mn, Ni, Fe and Cr.
and has a Cr content of approximately 0.44% based on the total weight.
Imitation gold Cu by alloy containing ~3.33% by weight
86.900~84.000%, AQa610~6゜6
50%, Mn1890~2.325%, Ni3.70
Imitation gold Cu 82.23%, All 6.25%, Mn 2.00 according to the invention described above, consisting of 0% and CrO, 44 to 3.325%, and containing Fe in a part of the Cu.
%, 3.7% Ni, 2.5% Fe and 3.33% Cr.

"Operations and Examples" Therefore, since the imitation gold is an alloy with the above composition, according to experimental data, it has a workability comparable to that of stainless steel, exhibits a golden color, and the golden color does not discolor in the atmosphere, so it can be used as an ornament. It can be used for drinking utensils, building materials, and as an imitation gold alloy. This use can be freely obtained by forming an ingot, which is an intermediate product in the production of the above-mentioned imitation alloy, and the processing includes plate processing by rolling, long processing by rolling or drawing, linear processing, casting, or forging. Plastic processing or molding may also be sculpting.

Cr (metal) becomes plastic at 1300-1600℃,
At 1650°C, it becomes molten and a small amount of Cu (metal) can be mixed with the already molten Cu (metal) at 1650°C, and Mn (metal) can be mixed with the already molten Cu (metal) at 1650°C. (metal) can be mixed with Fe (metal) and Xi (metal). The alloy ratios in the total mixture state are as shown in Table 2.

Table 2 The physical properties of the alloy shown in Table 2 are that it has a shiny golden color, is softer than stainless steel, is suitable for rolling, drawing, and other machining processes, and produces imitation gold that does not discolor in the atmosphere for a long time. The hardness is HRB according to Rockwell hardness test.
It was 66.

Also, an alloy was formed by mixing Cu and Cr, melting them at 1900''C, cooling them to 1600°C, and adding and melting Al, Mn, Fe, and aluminum in that state without evaporating the mixture.

For melting, a mixture of Cu and Cr is melted using a high-frequency melting furnace.
Melt at a high temperature of 800 to 200 liters.In this case, each metal has a different melting point and boiling point, so if you make a mistake in the above order, the metal with a lower boiling point will turn into a gas, and if the amounts of metals are different, the hardness and softness will be significantly uneven. Discoloration occurs because the metal hardens while still forming a metal alloy and does not form a sufficient alloy.Therefore, after mixing and melting Mn, Xi, Fe, and Cr, which have almost the same melting points, Cu (mpl 200-1250°C) is added. First, make a molten mixture of Cu, Cr, Mn, Fe, and Ni, then lower the temperature and add A(l).By the way, the mp of AQ is 800℃, and the above imitation gold is used for Western tableware and utensils. , ornaments, building materials, musical instruments,
It is used in electrical parts, lighting equipment, bulbs, Buddhist utensils, and many other areas.

"Effects" Since the present invention is configured as described above, it has excellent machinability.
It has the effect of producing imitation gold with no golden yellow discoloration.

Claims (3)

[Claims] (1) Main material is Cu, Al, Mn, Ni, Fe and C
It is an alloy with r and contains about 0.44 Cr based on the total weight.
Imitation gold made of an alloy containing about 3.33% by weight. (2) Cu86.900-84.000%, Al6.6
10-6.650%, Mn 1.890-2.325%,
Claim (1) consisting of 3.700% Ni and 0.44 to 3.325% Cr, and containing Fe in a part of the Cu.
) imitation gold as described. (3) Cu82.23%, Al6.25%, Mn2.0
0%, Ni3.7%, Fe2.5% and Cr3.33%
The imitation gold according to claim (1) or (2), comprising: