KR101593027B1 - Fe-Cu Alloy for RF Shielding Using Fe Cored Wire and Method for Preparing the Same - Google Patents

Abstract

The present invention relates to an Fe-Cu alloy to shield an electromagnetic wave using an Fe wire and a manufacturing method thereof. According to the present invention, the manufacturing method of the Fe-Cu alloy to shield the electromagnetic wave comprises: (a) a step of melting copper (Cu); (b) a step of adding Fe wire to the molten copper, and stirring the molten copper and the Fe wire to manufacture molten metal; and (c) a step of casting the molten metal wherein the Fe-Cu alloy includes 2-70 wt% of iron and the remainder consisting of copper. When manufacturing the Fe-Cu alloy in accordance with the present invention, the Fe wire (a wire wherein Fe powder is coated with a thin copper plate) is used instead of pure iron or an iron master alloy to remarkably reduce segregation. Also, the Fe wire is used to adjust an iron content in the Fe-Cu alloy in the range of 2-70 wt%.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a Fe-Cu alloy for shielding an electromagnetic wave using iron wire,

The present invention relates to an iron-copper alloy for shielding an electromagnetic wave and a method of manufacturing the same. More particularly, the present invention relates to an iron-copper alloy for shielding an electronic board using a Fe-cored wire and a method of manufacturing the same.

Generally, cables are usually enclosed in protective enclosures or enclosures with one or more bundles of wires or fiber optics insulated. Since the wires have low electrical conductivity and low resistance and require traction strength, The copper wire is twisted in a line or a few tens of lines, or a steel core is wrapped around a steel wire in the center, and an aluminum wire is used around the wire. In an ultra high voltage transmission line of 275,000 V, (Double conductor system), which is made up of several strands of wire, is the mainstream.

The above-mentioned cable is used as a power cable and a control cable in the field of information and communication according to the use. In the case of a control cable, it is prevented that noises are generated in the electric signal in the cable by electromagnetic waves and static electricity generated from the outside The electromagnetic wave must be shielded.

The electromagnetic wave shielding technology is applied to a communication cable in which electromagnetic wave shielding is applied by covering a copper tape or an aluminum tape, but it is shielded by common metal materials such as copper, aluminum, and iron. In case of using non-ferrous iron which is difficult, single-core cable generates heat by electromagnetic induction, shortening the lifetime of cable and aging quickly, and additionally requires a plating process because of its weak corrosion resistance. Further, The copper tape is wrapped around it, and the wrought iron tape is wound again or the wrought iron tape is wound and wound in copper wire. However, due to the increase of the cost of production of cable due to the heat generation or double operation, The problem and shielding effect is less than 30dB and more than 40dB As shielding to use the control cables or 10-micron foil rolled around poles of waste requiring level there is a problem that production is not possible.

In connection with the above-mentioned electromagnetic wave shielding technology, for example, in the prior art, a 'alloyed copper foil having 1 to 4% by weight of tin and 2-7% by weight of antimony and the like is disclosed in Korean Patent Publication No. 1990-2983 Discloses a leaded laminate tape for cable coating. However, the alloy has excellent corrosion resistance, but has a disadvantage in that it has poor conductivity and low electromagnetic wave shielding effect. Also, Korean Registered Patent Publication No. 10-567739 discloses an aluminum foil layer; A film layer adhered to one surface of the aluminum foil layer via an adhesive layer; A urethane resin adhesive layer formed by applying a urethane-based resin solution to the outer surface of the film layer and drying and heat-sealing the resin layer; And a bonding layer formed on the outer surface of the urethane resin adhesive layer in a state in which the pellets are melted and sprayed on the outer surface of the urethane resin adhesive layer to form a coating layer and laminate the laminate. However, the aluminum layer has a film layer, There is a problem that the production process is complicated and the productivity is lowered and the layer and the layer are widened. In addition, in the materials such as copper, aluminum, and iron, electromagnetic wave shielding effect is hardly obtained in a low frequency range from 0.1 MHz to 100 MHz There is a problem.

The present invention relates to a conventional copper tape, an aluminum mylar tape, a copper tape-iron tape (hereinafter referred to as " copper tape ") which is used for shielding electromagnetic waves of coaxial cables for power and control (CVS, CVVS, CCVS, etc.) The present inventors have completed the present invention by developing a material having excellent electromagnetic wave shielding effect by an iron copper alloy which can replace the above-mentioned materials.

Korean Patent Laid-Open Publication No. 10-2005-0109545, entitled: Iron-chromium-aluminum-based alloy, Published on September 23, 2004,

A problem to be solved by the present invention is to provide a method of manufacturing an iron copper alloy by increasing iron content by using iron wire.

Another object of the present invention is to provide an iron copper alloy having an increased iron content by using an iron wire.

In order to solve the above problems,

a) dissolving copper (Cu);

b) adding an Fe wire to the dissolved copper (Cu);

c) stirring the molten copper (Cu) to which the iron cored wire is added to prepare a molten metal; and

and d) casting the molten metal. The method of manufacturing an iron-copper alloy for electromagnetic wave shielding according to claim 1, wherein the iron and the remaining copper are contained in an amount of 2 to 70% by weight.

In the method for manufacturing an iron-copper alloy according to the present invention, the step of dissolving copper is performed at a temperature of 1,200 ° C to 1,300 ° C, and the step of adding the iron wire is performed at a temperature of 1,300 ° C to 1,600 ° C Do.

Further, the stirring step is preferably carried out in a nitrogen, argon or vacuum atmosphere. The iron content of the iron copper alloy is controlled by controlling the addition amount of the iron wire.

Still another object of the present invention is to provide a method of manufacturing a semiconductor device, comprising: a) dissolving copper (Cu); b) adding iron wire to the dissolved copper (Cu); (c) stirring the molten copper (Cu) to which the iron wire has been added to produce a molten metal, and d) casting the molten metal. An iron-copper alloy for shielding electromagnetic waves containing copper is provided.

In the iron-based copper alloy for converting electromagnetic waves according to the present invention, the iron wire is made of a wire coated with copper and the iron wire is made of 60 to 80% by weight of iron and 20 to 40% by weight of copper .

According to the present invention, the occurrence of segregation is remarkably reduced by using iron cored wire instead of using pure iron or iron-parent alloy in the production of iron copper alloy. Further, by using iron wire, 2 to 70% by weight.

Fig. 1 is a photograph showing the result of comparison between the surface texture of the iron-copper alloy according to the present invention and the surface texture of the conventional iron-copper alloy.

Hereinafter, the present invention will be described in more detail.

The present invention provides a method for producing a copper alloy, comprising: a) dissolving copper (Cu); b) adding iron wire to the dissolved copper (Cu) and stirring to produce a molten metal; And d) casting the molten metal. The method of manufacturing an iron-copper alloy for shielding electromagnetic interference according to claim 1, wherein the iron-copper alloy comprises 2 to 70% by weight of iron and the balance of copper.

In the step of dissolving copper (a) according to the present invention, the dissolution may be carried out at a temperature of 1,100 ° C or higher, and preferably at a temperature of 1,100 ° C to 1,200 ° C.

Subsequent step b) is followed by the addition of a Fe cored wire to the dissolved copper (Cu). Here, the iron wire refers to an iron cored wire, which is a wire in which iron powder is coated with copper or other metal. The iron wire is preferably composed of 60 to 80% by weight of iron and 20 to 40% by weight of copper, and is generally composed of 70% by weight of iron and 30% by weight of copper.

The step of adding the iron wire is preferably higher than the temperature for dissolving copper. For example, the temperature is preferably 1300 ° C or higher, more preferably 1,300 ° C to 1,600 ° C.

Further, the step of adding the iron wire is preferably carried out under nitrogen, argon or vacuum. When air is added in the process of iron wire addition, It is preferable to proceed under nitrogen, argon or vacuum since the iron component may cause an oxidation reaction and thus bubble may be generated.

Conventionally, pure iron has been added in place of iron wire. However, the addition of pure iron can usually be carried out up to 2%, and when exceeding 2%, the Fe component does not dissolve and segregation occurs due to exceeding the limit. However, the addition of the iron wire can be added so that the content of iron in the cast iron copper alloy is 2 to 70% by weight.

The addition amount of iron wire according to iron content in cast iron copper alloy is as follows.

1) in producing an iron copper alloy having an iron content of 2% by weight of an iron copper alloy: 2 ÷ 0.7 = 2.85% by weight;

2) when preparing an iron copper alloy having an iron content of 10% by weight of an iron copper alloy: 10 ÷ 0.7 = 14.28% by weight;

3) When preparing iron copper alloy having iron content of 70% by weight of iron copper alloy: 70 ÷ 0.7 = 100% by weight (in this case, only Fe wire is dissolved 100% without pure copper).

Therefore, by controlling the amount of iron wire to be charged, it becomes possible to produce an iron copper alloy containing a specific iron content.

The molten copper (Cu) is stirred for 1 to 30 minutes by adding the iron wire (Fe wiere) to prepare a molten metal. In this case, agitation can be accomplished for a period of time through a general method in this field.

Subsequent c) In the step of casting the molten metal, it is possible to carry out the continuous casting method, and a large casting rod of a billet shape or a small casting rod of a bevelling shape can be produced. Here, the continuous casting method is a method of successively pouring a molten metal into a mold and solidifying it to make the ingot, which is a material of the plastic working, relatively long. The casting is continuously poured from above the water-cooled mold, You can make long ingots of several meters to several tens of meters by pulling the hardened ingot downward continuously.

Before the step of casting the molten metal, degassing, removal of non-metallic inclusions, and addition of a nucleus generating material to make fine and uniform crystal grains may be performed so as not to cause bubbles in the molten metal.

The iron-copper alloy for shielding electromagnetic waves, which contains 2 to 70% by weight of iron and the remaining copper, can be produced through the above-mentioned method. .

The iron-copper alloy according to the present invention can be used not only for shielding electromagnetic waves but also for high-output motor windings, welder tips, electrodes and the like.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

Example  One

Of iron-copper alloy (2Fe-98Cu)  Produce

97.15% by weight of prepared pure copper was charged into a high frequency induction furnace and completely dissolved at a temperature of 1200 ° C by applying electricity. Then, the temperature was raised to 1,300 ° C in a nitrogen atmosphere to obtain 2.85% by weight of iron wire (iron 70% and copper 30% And the mixture was agitated for 10 minutes to prepare a molten metal. The molten metal was deoxidized, and the molten metal was cooled for about 5 minutes. The molten metal was melted in a mold at 1300 ° C by a vertical continuous casting method to obtain a molten metal having a diameter of 200 mm and a length of 1,500 mm Respectively.

Example  2

Copper alloy (10Fe-90Cu)  Produce

85.72% by weight of a preliminarily prepared pure copper was charged into a high frequency induction furnace and completely dissolved at a temperature of 1200 ° C by applying electricity. Then, the temperature was raised to 1400 ° C under a nitrogen atmosphere to obtain 14.28% by weight of iron wire (iron 70% and copper 30% And the mixture was stirred for 10 minutes to prepare a molten metal. The molten metal was deoxidized, and the molten metal was soaked for about 5 minutes. The molten metal was melted at a mold temperature of 1,350 DEG C by a vertical continuous casting method to obtain a molten metal having a diameter of 200 mm and a length of 1,500 mm Respectively.

Example  3

Of iron-copper alloy (70Fe-30Cu)  Produce

100% by weight of iron wire (70% of iron and 30% of copper) prepared in advance was charged in a high frequency induction furnace under a nitrogen atmosphere and completely dissolved at a temperature of 1,600 캜 by applying electricity, and the resulting molten metal was deoxidized And then cooled for about 5 minutes and then cast into a mold at 1,500 ° C. by a vertical continuous casting method to prepare a casting rod having a diameter of 200 mm and a length of 1,500 mm.

Comparative Example  One

Copper alloy (10Fe-90Cu)  Produce

75 wt% of copper was dissolved to prepare a molten metal. Then, 25 wt% of an iron mobility alloy (50 Fe-50Cu) ingot prepared in advance was charged into a high frequency induction furnace, and electricity was applied thereto to completely dissolve the molten alloy at a temperature of 1,400 ° C., Was deoxidized and subjected to a vertical continuous casting process for about 5 minutes to form a casting rod having a diameter of 200 mm and a length of 1,500 mm by a mold at 1,300 ° C.

Test Example  One

Iron content of the cast rods prepared in Example 2 was analyzed by dry and ICP analysis four times, respectively. The results are shown in Table 1 below.

Dry analysis ICP analysis Fe component (wt%) Fe component (wt%) One 12.301 7.741 2 14.724 7.812 3 12.664 7.977 4 - 8.211 Avg. 13.230 7.935

As the SES (Spark Emission Spectrometer) analyzes the components in the color of the flame by burning the surface, the content of the components may vary depending on the surface properties, and there may be a partial difference in the components. The wet analyzer is less influenced by segregation as it dissolves the sample in the water and analyzes it in the liquid state.

Test Example  2

The surface texture of the main rods obtained in Examples 1 and 2 and Comparative Example 1 was analyzed by an optical microscope, and the results are shown in FIG.

According to Fig. 1, it is possible to observe a uniform distribution of fine Fe particles at the top of Comparative Example 1, and segregation of Fe particles at the defective portion. It can be seen that the Fe particles are uniformly distributed in Examples 1 and 2, and it is confirmed that the occurrence of segregation is remarkably reduced.

Claims (7)

a) dissolving copper (Cu);
b) adding iron cored wire to the dissolved copper (Cu) and stirring to produce a molten metal; And
and c) casting the molten metal. 2. The method of claim 1,
Wherein the iron cored wire is made of a wire in which an inner Fe powder is coated with copper.
The method according to claim 1,
Wherein the step of dissolving copper is performed at a temperature of 1,100 ° C to 1,300 ° C, and the step of adding the iron wire is performed at a temperature of 1,300 ° C to 1,600 ° C.
The method according to claim 1,
Wherein the stirring step is carried out in a nitrogen , argon or vacuum atmosphere.
The method according to claim 1,
Wherein the iron content of the iron copper alloy is controlled by adjusting the addition amount of the iron wire.
An iron-copper alloy for shielding electromagnetic interference, comprising 2 to 70% by weight of iron and the balance copper, produced using iron cored wire according to any one of claims 1 to 4.
delete 6. The method of claim 5,
Wherein the iron cored wire comprises 60 to 80% by weight of iron and 20 to 40% by weight of copper.

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