CN1037456C - Copper-base alloy for golden ornamenting and its making process - Google Patents

Abstract

The present invention relates to a copper base alloy material used for manufacturing imitating gold decorations and a manufacturing and processing technique of the copper base alloy material. The copper base alloy material comprises the components by the following proportion: 3 to 9% of Al, 1 to 4% of Sn, 0.1 to 1.6%of In, 0.1 to 1.2% of Ni, 0.01 to 1.0% of Fe, 0.01 to 0.7% of Cr, 0.01 to 0.8% of rare earth and copper. The manufacturing technique comprises the steps of fusion casting, homogenizing anneal, cold deformation and re-crystallization anneal. The luster of the golden decoration copper base alloy is equivalent to that of 18 to 24K gold, and the price of the copper base alloy is one sixtieth to one eightieth of that of 18K gold. The copper base alloy has the advantages of excellent discoloration-resisting property, mechanical property and processing performance. The alloy can be manufactured into various watch cases, clock cases, finger rings, spectacle frames, etc.

Description

Golden copper base alloy and the manufacturing process of decorating

The present invention relates to the manufacturing process of non-ferrous metal and alloy, specifically a kind of copper alloy used for gold-like decorative purpose and manufacturing processing technology thereof.

Golden gorgeous attractive in appearance, graceful luxurious with its color and luster, extremely people's favor.Gold always is considered to make the best materials of ornament, but the gold resource rareness costs an arm and a leg, and has limited the demand of people to it, development can substitute gold and cheap metallic substance just becomes urgent problem, therefore competitively researchs and develops substitute products both at home and abroad." dark copper alloy of resistance and preparation method (the Tarnish Resistant Copper Alloy and Method ofPreparation) " that U.S. Pat 4493736 is announced, its alloy formula (in weight %) is Al9-11%, Ni0.75-1.25%, In0.01-0.1%, the Cu surplus, this alloy has good processing properties, is used to make jewellery, trophy and dental material.Disclosed golden darkening proof copper base alloy for docoration of Chinese patent CN87192903A and manufacture method, this alloy formula (in weight %) is Al2-7%, Sn1-5%,＜1% rare earth, surplus is Cu, and this alloy has the dark performance of better resistance than the Cu-Al-Ni alloy in various media, and thermoplasticity also makes moderate progress by adding rare earth, but this alloy color and luster owes soft, and the resistance performance still can not be tested by the artificial perspiration.

The object of the present invention is to provide the ornamental copper base alloy of a kind of gold, this alloy approaches gold, is equivalent to 18-24K, and through artificial perspiration's test, it is golden yellow that this alloy still keeps, and also has favorable mechanical performance and processing characteristics.

The present invention is achieved in that this gold decoration copper base alloy; By Al3-9%, Sn1-4%, In0.1-1.6%, Ni0.1-1.2%, rare earth 0.01-0.8%, Fe0.01-1.0%, Cr0.01-0.7%, this manufacturing process is: the founding → annealing → cold deformation → recrystallization annealing of evenly degenerating.Concrete technology is:

A, founding: electrolytic copper, Cu-Ni, Cu-Fe, Cu-Cr master alloy are pressed 0.1-1.2%Ni, 0.01-1.0%Fe, the ratio of 0.01-0.7%Cr, the fusing back adds 5-9%Al in medium-frequency induction furnace, 1-4%Sn, 0.1-1.6%In and Al rare earth intermediate alloy, smelting temperature are controlled at 1150-1200 ℃ and make the solution thorough mixing, with ice crystal masonry flux, burning the notes temperature is 1000-1180 ℃;

B, homogenizing annealing: ingot casting is incubated 4-8 hour between 750-840 ℃;

C, cold deformation: between the 1-70% deflection, carry out the cold bundle of multiple tracks;

D, recrystallization annealing: annealing temperature is incubated 1-2 hour between 550-650 ℃.

Further specify below by specific examples:

Embodiment 1: this gold decorative copper alloy, and its proportioning is: (weight %) Al9%, Sn1%, In0.1%, Ni0.5%, Fe0.5%, Cr0.4%, 0.15% rare earth, Cu surplus, production technique is: in crucible furnace electrolytic copper, Cu-Ni, Cu-Fe, Cu-Cr master alloy are melted, add fine aluminium then, pure indium and Al-rare earth treat that liquation mixes fully, smelting temperature is controlled at 1150-1200 ℃ with ice crystal masonry flux, pours into a mould casting.Pouring temperature is 1100-1180 ℃, ingot casting was through 840 ℃ of annealing 4 hours, again after twice 50% cold deformation, 600 ℃ of annealing 2 hours, this alloy color and luster is equivalent to 20K, as cast condition and distortion annealing back alloy are qualified through salt-fog test and artificial perspiration's experimental test, and the two states alloy soaks through 3.5%NaCl and still kept golden yellow to shape simultaneously in 210 hours, can be made into various watchcases, clock shell, ring and glasses etc.

Embodiment 2: a kind of pinchbeck alloy, its proportioning is: (weight %) Al8%, Sn1%, In0.6%, Cr0.4% and rare earth 0.05%, Cu surplus.This alloy production process is close with embodiment 1, and it is golden yellow that this alloy is, and is equivalent to 20K.

Claims (2)

1, a kind of golden copper base alloy of decorating is characterized in that chemical ingredients is Al3-9%, Sn1-4%, In0.1-1.6%, Ni0.1-1.2%, rare earth 0.01-0.8%, Fe0.01-1.0%, Cr0.01-0.7%, Cu surplus.

2, the gold of claim 1 is decorated the manufacturing process of copper base alloy, it is characterized in that,

A, founding: electrolytic copper, Cu-Ni, Cu-Fe, Cu-Cr master alloy are pressed 0.1-1.2%Ni, 0.01-1.0%Fe, the ratio of 0.01-0.7%Cr, the fusing back adds 5-9%Al in medium-frequency induction furnace, 1-4%Sn, 0.1-1.6%In and Al-rare earth intermediate alloy, smelting temperature are controlled at 1150-1200 ℃ and make the solution thorough mixing, with ice crystal masonry flux, teeming temperature is 1000-1180 ℃;

B, homogenizing annealing: ingot casting is incubated 4-8 hour between 750-840 ℃;

C, cold deformation: between the 1-70% deflection, carry out the cold bundle of multiple tracks;

D, recrystallization annealing: annealing temperature is incubated 1-2 hour between 550-650 ℃.