KR20170109873A - Method for fabricating carbon-fiber cored wire which is coated with aluminium - Google Patents

Abstract

A method for manufacturing a carbon fiber bundle, comprising the steps of: preparing a carbon fiber bundle having a nickel coating on an outer surface thereof; forming an aluminum covering member by surrounding a plurality of the bundles of carbon fiber bundles with an aluminum plate; There is provided a method for producing an aluminum-coated carbon fiber core wire comprising the steps of: alloying a nickel coating film with an alloy including nickel and aluminum.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing an aluminum-coated carbon fiber core wire,

More particularly, the present invention relates to an aluminum-coated carbon fiber core wire and a manufacturing method thereof.

Transmission line is a transmission line used to send electricity generated from water / thermal power or nuclear power plant to the substation of suburbs. In order to improve the transmission efficiency by decreasing the sag and the electric resistance, it is necessary to realize a light transmission line and a high tension simultaneously, and a composite material using a high tension lightweight core is being developed. Recently, attempts have been made to increase the strength and weight by using the recently developed polymer matrix carbon fiber composite material, but it is difficult to take up the plastic fiber due to plastic deformation and is vulnerable to fire.

A related prior art is Korean Patent Publication No. KR20030032281A (published on Mar. 26, 2003, entitled " Inventive Aluminum Alloy Wire Rod Manufacturing Method ").

It is an object of the present invention to provide a new type carbon fiber core aluminum wire having a high tensile strength, a low thermal expansion coefficient and a light weight, . However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the present invention, there is provided an aluminum-coated carbon fiber core wire. Wherein the aluminum-coated carbon fiber core wire includes a core portion and a cover portion that surrounds and surrounds the core portion, the core portion comprising: a plurality of carbon fiber bundles; And a boundary layer surrounding at least a portion of each of the carbon fiber bundles to form a boundary between the carbon fiber bundles, wherein the cover comprises aluminum or an aluminum alloy, and the boundary layer comprises an alloy comprising aluminum and nickel .

In the aluminum-coated carbon fiber core wire, the boundary layer further forms a second boundary between the carbon fiber bundle and the covering portion, and the boundary layer forming the second boundary may contain an alloy including aluminum and nickel .

In the aluminum-coated carbon fiber core wire, the carbon fiber bundle may be formed by twisting a plurality of carbon fibers.

According to another aspect of the present invention, there is provided a method of manufacturing an aluminum-coated carbon fiber core wire. The method of manufacturing an aluminum-coated carbon fiber core wire according to the present invention includes the steps of: preparing a carbon fiber bundle having a nickel coating on its outer surface; Forming a plurality of the carbon fiber bundles by wrapping the bundle of carbon fibers with an aluminum plate to form an aluminum cover; And alloying the nickel coating formed on the outer surface of the carbon fiber bundle into an alloy including nickel and aluminum by heat-treating the aluminum covering body.

In the method of manufacturing the aluminum-clad carbon fiber core wire, the aluminum clad body may be formed of an aluminum pipe filled with the plurality of carbon fiber bundles. The aluminum pipe may be formed from the aluminum plate using a roll forming process.

In the method of manufacturing the aluminum-coated carbon fiber core wire, the alloying may include a step of increasing a bonding force between the plurality of carbon fiber bundles and a bonding force between the carbon fiber bundle and the aluminum plate material.

According to one embodiment of the present invention as described above, a new type of carbon fiber core aluminum wire having a high tensile strength, a low thermal expansion rate, and a light weight, as well as an economical efficiency, and a manufacturing method thereof can be realized. Of course, the scope of the present invention is not limited by these effects.

1 is a flowchart illustrating a method of manufacturing an aluminum-coated carbon fiber core wire according to an embodiment of the present invention.
2 is a diagram illustrating a cross-sectional configuration of an aluminum clad body in a method of manufacturing an aluminum clad carbon fiber core wire according to an embodiment of the present invention.
3 is a diagram illustrating a cross-sectional configuration of an aluminum-coated carbon fiber core wire according to an embodiment of the present invention.
4 is a mapping of a cross-sectional profile of a center portion of an aluminum-coated carbon fiber core wire according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

FIG. 1 is a flowchart illustrating a method of manufacturing an aluminum-coated carbon fiber core wire according to an embodiment of the present invention. FIG. 2 is a cross- Fig. 3 is a diagram illustrating a cross-sectional configuration of an aluminum-clad carbon fiber core wire according to an embodiment of the present invention.

Referring to FIGS. 1 to 3, a method of manufacturing an aluminum-coated carbon fiber core wire according to an exemplary embodiment of the present invention includes preparing a carbon fiber bundle 10 having a nickel coating 20 on an outer surface thereof (S100); Forming a plurality of the carbon fiber bundles (10) by an aluminum plate (40) to form an aluminum clad (S200); And a step (S300) of alloying the nickel coating 20 formed on the outer surface of the carbon fiber bundle 10 into an alloy containing nickel and aluminum by heat-treating the aluminum coating.

First, the first step S100 will be described. Each carbon fiber bundle 10 is formed by twisting a plurality of carbon fibers. For example, 3,000, 6,000, 12,000 or 24,000 carbon fibers can be twisted to form each carbon fiber bundle 10.

Subsequently, nickel is coated on the surface of the carbon fiber bundle by, for example, an electrolytic plating method to produce the carbon fiber bundle 10 having the nickel coating 20 formed on the outer surface thereof. In the aluminum-coated carbon fiber core wire according to an embodiment of the present invention, the metal may be coated on the carbon fiber to increase the interfacial bonding force between the carbon fiber and the matrix.

In order to increase the interfacial bonding strength of the carbon fiber as a reinforcing material constituting the aluminum-coated carbon fiber core wire, the carbon fiber can be surface-treated using an electrochemical oxidation method using an acidic or basic electrolytic solution or a gas phase oxidation method In this case, there is a problem that the surface of the carbon fiber itself is damaged. The present inventor has introduced the nickel-coated carbon fiber to secure the interfacial bonding strength between the carbon fiber and the base.

Subsequently, the second step (S200) will be described. A plurality of the carbon fiber bundles 10 having the nickel coating 20 on the outer surface thereof are surrounded by the aluminum plate 40 to form the aluminum cover shown in FIG. The aluminum plate 40 may comprise, for example, an aluminum pipe formed using a roll forming process. In this case, the aluminum covering body can be understood as an aluminum pipe filled with a plurality of carbon fiber bundles 10 having a nickel coating 20 on the outer surface thereof. An empty space 30 is formed between the plurality of carbon fiber bundles 10 having the nickel coating 20 formed on the outer surface thereof.

Subsequently, the third step S300 will be described. The nickel coating 20 formed on the outer surface of the carbon fiber bundle 10 can be alloyed with the alloy 50 including nickel and aluminum by heat treating the aluminum clad body shown in Fig. In this case, a part of the aluminum plate material 40 is melted and reacted with the nickel coating 20 to be alloyed with the alloy 50 including nickel and aluminum. Further, the space between the plurality of carbon fiber bundles 10 is filled with an empty space 30 may be filled with an alloy 50 comprising nickel and aluminum.

The third step S300 may further include a step of pressing the aluminum plate 40 from the outside to the center in addition to the heat treatment step.

According to this, after the carbon fiber bundle is disposed first and the aluminum plate material surrounding the carbon fiber bundle is processed into a pipe shape, the aluminum plate material is melted and penetrated into the empty space inside the carbon fiber bundle to form a base . The driving force by which the molten aluminum can penetrate into the space between the carbon fibers may include an externally applied pressing force or may include a capillary force to fill a fine space between the carbon fibers.

By performing the above-described steps, an aluminum-coated carbon fiber core wire 100 according to an embodiment of the present invention is realized.

The aluminum coated carbon fiber core wire 100 according to an embodiment of the present invention includes core portions 10 and 50 and a covering portion 40 that surrounds and covers the core portion from outside. The core portion includes a plurality of carbon fiber bundles (10); And a boundary layer (50) surrounding the at least a portion of each of the carbon fiber bundles (10) to form a first boundary between the carbon fiber bundles (10). The covering portion 40 contains aluminum or an aluminum alloy. The boundary layer 50 contains an alloy comprising aluminum and nickel. Further, the boundary layer 50 further forms a second boundary between the carbon fiber bundle 10 and the covering portion 40, and the boundary layer 50 forming the second boundary also contains an alloy including aluminum and nickel . This alloying can increase the bonding force between the plurality of carbon fiber bundles 10 and the bonding force between the carbon fiber bundle 10 and the aluminum plate material 40. [

The composition of the boundary layer 50 may include an aluminum-nickel alloy in which the nickel of the nickel coating 20 formed on the outer surface of the carbon fiber bundle 10 and the aluminum of the aluminum plate 40 react and alloy. Of course, the composition of the boundary layer 50 may include nickel of the nickel coating 20 formed on the outer surface, and may include aluminum resulting from the aluminum plate 40.

4 is a mapping of a cross-sectional profile of a center portion of an aluminum-coated carbon fiber core wire according to an embodiment of the present invention.

Referring to FIG. 4, it is confirmed that an aluminum component is detected at the center of the aluminum-coated carbon fiber core wire. This means that a part of the aluminum plate 40 is melted and infiltrated into the space between the carbon fiber bundles 10. It is also confirmed that the base in which the carbon fiber bundles 10 are dispersed therein is the above-described boundary layer 50 and contains aluminum and nickel.

The aluminum-clad carbon fiber core wire described above can be applied to various fields, for example, as a high-voltage transmission line. In the case of introducing carbon fibers into the core in order to realize both light weight and high tension of the transmission line, when carbon fibers are dispersed in a polymer matrix, plastic deformation is difficult and it is difficult to take up reels and is vulnerable to fire.

In order to overcome this, there is an alternative to dispersing the carbon fibers in the aluminum matrix. However, there are some difficulties to be solved in order to produce a composite of carbon material and aluminum. For example, carbon materials are difficult to disperse uniformly in aluminum because of their difficulty in dispersion due to van der Waals forces, and because of the difference in surface tension between the carbon material and aluminum, the carbon material and aluminum are well mixed There is no problem.

In the present invention, as described above, the carbon fiber bundle is first disposed, the aluminum plate material surrounding the carbon fiber bundle is processed into a pipe shape, and then the carbon material is heat-treated under pressure so that a part of the aluminum plate material melts and permeates into the empty space inside the carbon fiber bundle A method of forming a matrix has been disclosed. This makes it possible to economically realize an aluminum-coated carbon fiber core wire in which carbon fibers are uniformly dispersed in a base containing aluminum. Further, in order to increase the interfacial bonding strength between the carbon fiber and the base, a carbon fiber coated with nickel is introduced and subjected to an alloying process, thereby disclosing a base structure containing an aluminum-nickel alloy.

A method of manufacturing an aluminum-coated carbon fiber core wire according to an embodiment of the present invention has been described. This makes it possible to quickly and economically produce an aluminum-coated carbon fiber core wire in which carbon fiber is dispersed in a reinforcing material on an aluminum base using an easily available aluminum plate.

On the other hand, as a method for producing an aluminum-carbon composite material in which carbon fibers are dispersed in a reinforcing material on an aluminum base, there is a manufacturing method in which a carbon fiber bundle is immersed in an aluminum molten metal, or aluminum powder is filled between carbon fiber bundles and sintered However, the present invention is relatively advantageous in that these methods are relatively expensive.

While the present invention has been described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (7)

And a covering portion covering the core portion and the core portion from outside,
The core portion may include a plurality of carbon fiber bundles; And a boundary layer surrounding at least a portion of each of the carbon fiber bundles to form a boundary between the carbon fiber bundles,
The covering portion contains aluminum or an aluminum alloy,
Wherein the boundary layer comprises an alloy comprising aluminum and nickel,
Aluminum coated carbon fiber core wire. The method according to claim 1,
Wherein the boundary layer further forms a second boundary between the carbon fiber bundle and the covering portion, wherein the boundary layer forming the second boundary contains an alloy including aluminum and nickel. The method according to claim 1,
Wherein the carbon fiber bundle is formed by twisting a plurality of carbon fibers. Preparing a carbon fiber bundle having a nickel coating on its outer surface;
Forming a plurality of the carbon fiber bundles by wrapping the bundle of carbon fibers with an aluminum plate to form an aluminum cover; And
Annealing the aluminum covering body to alloy the nickel coating formed on the outer surface of the carbon fiber bundle with an alloy including nickel and aluminum;
Wherein the aluminum-coated carbon fiber core wire is produced by a method comprising the steps of: 5. The method of claim 4,
Wherein the aluminum covering body is made of an aluminum pipe filled with the plurality of carbon fiber bundles. 6. The method of claim 5,
Wherein the aluminum pipe is formed from the aluminum plate using a roll forming process. 5. The method of claim 4,
Wherein the alloying comprises increasing a bonding force between the plurality of carbon fiber bundles and a bonding force between the carbon fiber bundle and the aluminum plate material.

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