KR20140031521A - Method for plate type forming metal-carbon nano tube complex by a planetary ball mill - Google Patents

Abstract

Provided in the present invention is a method for forming a plate-shaped metal-carbon nanotube complex using a planetary medium pulverizer, including a step of conducting a milling in which metal powder and carbon nanotube are combined, using the planetary medium pulverizer. The ratio of the pulverizing medium applied to the medium pulverizer and the metal powder and carbon nanotube is 10 to 1 by weight, and the diameter of the pulverizing medium can range from 3 to 10 mm. Moreover, the milling can be conducted for 4 to 70 minutes at an rpm ranging from 300 to 700. The metal powder takes up about 97 to 98 % by weight and the carbon nanotube about 2 to 3 % by weight in total. The metal powder can be one of any group chosen among Au, Ag, Cu, Al, Mn, Fe, Sn, Zn, and Ti, and more desirably Al. In addition, the carbon nanotube can be a mixture comprising one or two kinds of any group chosen from single-wall carbon nanotube, double-wall carbon nanotube, thin-multi-layered carbon nanotube, and multi-layered carbon nanotube, and the diameter ranging from 0.7 nm to 100 μm, with a length ranging from 10 nm to 10 cm. [Reference numerals] (S10) Metal powder + carbon nanotube milling; (S20) Plate-shaped metal - carbon nanotube complex formation

Description

Technical Field [0001] The present invention relates to a method for forming a metal-carbon nanotube composite material using a planetary medium pulverizer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a metal-carbon nanotube composite material of a plate-like shape, and more particularly, to a metal-carbon nanotube composite material having excellent charging properties by mixing metal powder and carbon nanotubes using a planetary- Tube composite. ≪ / RTI >

Aluminum is used for life in kitchens, foils, disposable items, windows, cars, aircraft and spaceships. The characteristics of aluminum are as light as 1/3 of the weight of iron, and excellent strength when alloyed with other metals. In addition, there is a chemically stable oxide film on the aluminum surface, which is chemically stable since it prevents corrosion from proceeding by moisture or oxygen.

For this reason, aluminum has been used in automobiles and aircraft. In particular, in the case of automobiles, aluminum wheels are light compared to conventional iron wheels, which can reduce their own weight, which leads to a reduction in the weight of the vehicle body, thereby contributing to the reduction of fuel consumption. However, since aluminum has a tensile strength of about 40% as compared with iron, the thickness of the structural aluminum pipe or plate becomes very thick when used as a structural member, which results in excessive use of the material, resulting in cost increase .

In order to solve such problems, researches for producing a composite material and a composite material of a carbon material and aluminum excellent in tensile strength are actively conducted.

The most typical example is mixing using carbon nanotubes. Particularly, the carbon nanotube-copper composite powder is mixed with 100 parts by weight of aluminum powder with 1 part by weight with respect to 100 parts by weight of aluminum powder, treated by ball milling for 10 hours, collected and put into a mold, sintered at 600 캜 (Refer to Korean Patent Laid-Open No. 10-2010-0096377), the above functionalized carbon material is mixed with an aluminum powder in a ball mill at a ratio of 5 wt%, put into a steel container with a ball, and an inert gas such as argon A method of maintaining an inert atmosphere for 20 minutes and then proceeding with a ball mill at 400 rpm for 12 hours (Korean Patent Laid-Open No. 10-2009-0067568) is disclosed.

However, there are some problems in forming a composite material of aluminum and a carbon material as described above. The fundamental reason for this is that the physical and chemical properties of the two materials are different. The first is that carbon materials, for example, carbon nanotubes, are difficult to disperse uniformly in aluminum because they are difficult to disperse due to van der Waals forces between the tubes. The second is the different surface tension between the carbon material and the aluminum substrate. Typical examples of different surface tension are water and oil. The difference in surface tension between the two is about 2 to 3 times. However, in the case of carbon materials and aluminum, the study found that aluminum has a surface energy of 955 mN / m and that of carbon materials is 45.3 mN / m (JM Molina et al., International Journal of Adhesives 27 (2007) 394 -401, S. Nuriel, L. Liu, AH Barber, HD Wagner, Direct measurement of multiwall nanotube surface tension, Chemical Physics Letters 404 (2005) 263-266). That is, in the case of aluminum and carbon materials, the difference in surface tension is about 20 times, which means that the two materials do not mix well. In addition, the two materials are very dense and do not mix well during melting.

In order to solve the above problems, various technologies are known, but most of the technologies require a complicated process and a long process time, which leads to a problem of low productivity.

In addition, the aluminum-carbon composite material produced by the above techniques has a massive shape, and the massive aluminum-carbon composite material is difficult to apply to the final product.

Therefore, there is an urgent need for a technique capable of solving the above problems.

Korean Patent Publication No. 10-2010-0096377 Korean Patent Publication No. 10-2009-0067568

J.M. Molina et al. International Journal of Adhesives 27 (2007) 394-401, S. Nuriel, L. Liu, A.H. Barber, H.D. Wagner. Direct measurement of multiwall nanotube surface tension, Chemical Physics Letters 404 (2005) 263-266

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a metal-carbon nanotube composite material having a plate-like shape by performing milling of a metal powder and a carbon nanotube at a specific time and rotational speed using a planetary- .

The method for forming the metal-carbon nanotube composite material according to the present invention may include mixing metal powder and carbon nanotubes using a planetary medium pulverizer to perform milling.

The weight ratio of the metal powder to the carbon nanotubes is preferably 10: 1, and the diameter of the pulverizing medium is 3 to 10 mm.

Also, the milling can be performed at 300 to 700 rpm for 4 to 70 minutes.

The metal powder and the carbon nanotube may be 97 to 98 wt% and 2 to 3 wt%, respectively, based on the total weight of the mixed metal powder and the carbon nanotube.

The metal powder may be any one selected from the group consisting of gold, silver, copper, aluminum, manganese, iron, tin, zinc and titanium, and more preferably aluminum.

The carbon nanotubes may be one or a mixture of two or more selected from the group consisting of single wall carbon nanotubes, double wall carbon nanotubes, thin multi wall carbon nanotubes, and multiwall wall carbon nanotubes. May have a diameter of 0.7 nm to 100 m and a length of 10 nm to 10 cm.

As described above, the metal powder according to the present invention and the carbon nanotubes are mixed using a planetary medium pulverizer, and the milling step is performed at a specific time and rotational speed to produce a plate-like metal-carbon nanotube A composite material can be manufactured.

In addition, the metal-carbon nanotube composite material of the plate-like shape formed according to the present invention has a better filling property than the massive metal-carbon nanotube composite material.

Furthermore, the manufacturing process is simple and the manufacturing cost can be reduced, and the mass production can be improved.

1 is a flowchart according to an embodiment of the present invention;
2 is a photograph showing a planetary medium pulverizer used in an embodiment of the present invention;
3 is a schematic diagram illustrating the motion mechanism of a planetary media mill used in one embodiment of the present invention;
FIGS. 4A and 4B are SEM photographs of raw samples of the particles before the milling of the present invention was taken,
4A is a SEM photograph of a raw sample of aluminum powder;
4B is a SEM photograph of a raw sample of carbon nanotubes;
FIGS. 5A and 5B are SEM images of the aluminum-carbon nanotube composite material according to the time of milling according to an embodiment of the present invention.

Hereinafter, the present invention will be described in further detail with reference to examples. However, the following examples are intended to illustrate one preferred embodiment of the present invention, and the scope of the present invention is not limited thereto.

The present invention provides a method for forming a metal-carbon nanotube composite material using a planetary medium pulverizer.

In one preferred embodiment, the metal-carbon nanotube composite material may be formed in a plate-like shape by a method including mixing metal powder and carbon nanotubes using a planetary medium pulverizer and performing milling.

1 is a flowchart according to an embodiment of the present invention.

Referring to FIG. 1, a metal-carbon nanotube composite material may be formed (S 20) by milling a metal powder and a carbon nanotube using a planetary medium pulverizer (S 10).

As described above, the plate-shaped metal-carbon nanotube composite material according to the present invention has excellent filling characteristics and can be easily applied to the end product over time, thereby forming a plate-like metal-carbon nanotube composite material. Further, the manufacturing process is simple and the manufacturing cost can be reduced, and the mass production can be improved.

In order to accomplish the present invention, first, a milling step may be required to physically impact the metal powder and the carbon nanotube to mix the metal powder and the carbon nanotube.

Specifically, as a result of experiments conducted by the inventors of the present invention, it has been found that when the conventional ball mill is used, the desired metal-carbon nanotube composite material of the present invention can not be produced and it is difficult to expect the above-described effects.

Therefore, in order to form the desired plate-like metal-carbon nanotube composite material of the present invention, it is preferable to perform milling using a planetary ball mill.

FIG. 2 is a photograph showing a planetary medium pulverizer used in an embodiment of the present invention, and FIG. 3 is a schematic diagram showing a motion mechanism of a planetary medium pulverizer used in an embodiment of the present invention.

2 and 3, in the planetary type mill, the turntable 110 rotates and the port 120 rotates itself, that is, the grinding port 120 itself in which the grinding is performed rotates and revolves simultaneously The ball mill has a movement in the form of a planetary shape, and thus a very large energy is applied as compared with a normal ball mill and a stirring ball mill. Accordingly, the movement of the pulverizing medium 130 in the pulverizing port 120 is very fast and the force acting on the pulverizing medium 130 is much greater than that of the conventional pulverizing device. In other words, it is preferable to use a planetary type pulverizer because pulverization of the pulverization media 130 due to rotation, collision of the pulverizing medium 130 with the inner wall of the pulverizing port 120, and the like are possible.

In some cases, the milling step according to the present invention can be performed under an inert gas atmosphere in which oxygen and moisture are sufficiently removed to prevent oxidation of the metal powder. The inert gas can be used without restrictions as long as it is a gas having low reactivity, but preferred examples thereof include argon gas, nitrogen gas, and a mixed gas of argon gas and nitrogen gas.

The weight ratio of the pulverizing medium to the planetary medium pulverizer, the metal powder and the carbon nanotube may be 10: 1, and the diameter of the pulverizing medium may be 3 to 10 mm. When the diameter of the pulverizing medium is less than 3 mm, the metal-carbon nanotube composite material can not be formed due to insufficient energy supply. On the other hand, when the diameter of the pulverizing medium exceeds 10 mm, There is a possibility that the physical properties may be lowered due to excessive collision of the tube.

In performing the milling step, milling is preferably carried out at 300 to 700 rpm for 4 to 70 minutes.

Specifically, when the metal powder is mixed with the carbon nanotubes and milling is performed for less than 4 minutes, the energy supply time by the pulverizing medium is insufficient, so that the desired metal-carbon nanotube composite material of the present invention is not formed . On the other hand, when the time exceeds 70 minutes, secondary powdering of the powder particles occurs and the desired metal-carbon nanotube composite of the present invention can not be formed.

When the rotation speed is less than 300 rpm, the metal powder and the carbon nanotube are not properly mixed to form the desired plate-shaped metal-carbon nanotube composite material of the present invention. When the rotation speed is less than 300 rpm, There may be a problem that the physical properties are lowered due to the high temperature reaction due to the collision of the carbon nanotubes.

In the course of performing such milling, the metal powder and the carbon nanotube may be spherical metal-carbon nanotube composites, and the spherical metal-carbon nanotube composite may be a plate-shaped metal-carbon nanotube composite, Can change. The spherical metal-carbon nanotube composite material or the plate-like metal-carbon nanotube composite material may have a structure in which carbon nanotubes are adhered to at least a part of an aluminum surface or an inner surface or a surface and an interior thereof, It can prevent the phenomenon.

Therefore, all the numerical conditions of the size, the rotating speed and the milling time of the pulverizing medium must be satisfied, so that the desired effect of the present invention can be achieved.

97 to 98 wt% of metal powder and 2 to 3 wt% of the carbon nanotubes can be mixed with the mixed metal powder and the total weight of the carbon nanotubes.

Specifically, when the content of the metal powder is less than 97 wt%, it may be difficult to form metal powder particles, and when the content of the metal powder is more than 98 wt%, it may be difficult to attach the carbon nanotubes to the surface of the metal powder particles.

If the content of the carbon nanotubes is less than 2 wt%, the effect of strengthening may not be sufficient and the strengthening effect may not be expected. On the contrary, when the content of carbon nanotubes is more than 3 wt%, the brittleness is increased, Can lead to deterioration.

Therefore, in the case of the metal-carbon nanotube composite material having the above-mentioned content, it is possible to provide an effect of increasing the tensile strength as compared with the conventional pure metal.

The metal powder may be selected from the group consisting of gold, silver, copper, aluminum, manganese, iron, tin, zinc and titanium, preferably aluminum.

The carbon nanotubes may be selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, thin multi-walled carbon nanotubes, and multi-walled carbon nanotubes.

Although the diameter and length of the carbon nanotubes are not limited, the diameter is preferably 0.7 nm to 100 탆, and the length is preferably 10 nm to 10 cm.

Carbon nanotubes are composed of carbon with sp ² hybrid bonds, and because they have a structurally stable form, they have mechanical properties that are 100 times stronger than steel. Accordingly, since the metal-carbon nanotube composite according to the present invention is a composite material in which carbon nanotubes composed of carbon having sp ² hybrid bonds are attached to the surface of metal powder, a metal-carbon nanotube composite material having excellent mechanical strength is formed can do.

{Example}

Example 1

Aluminum powder and carbon nanotubes were prepared. The carbon nanotubes were 10 to 20 nm in thickness and 10 to 20 mu m in length, and aluminum powder was 50 mu m in size.

8.16 g of 98 wt% of aluminum powder and 0.16 g of 2 wt% of carbon nanotubes were put into an ultra-high speed oil-based media grinder with respect to the total weight of aluminum powder and carbon nanotube, and milling was performed at a rotation speed of 700 rpm for 5 minutes Respectively. SEM photographs were taken to grasp the shape of the ground particles.

As a result, a plate-like aluminum-carbon nanotube composite material was formed.

In order to prevent oxidation of aluminum during the milling process, Ar, which is an inert gas, was injected into the port, and the port from which oxygen and moisture were sufficiently removed was securely sealed and then milled. The milling media used in the milling are zirconia balls 3 mm.

[Example 2]

In the same manner as in Example 1 except that the pulverizing medium having a diameter of 5 mm was used and the rotational speed of the planetary type pulverizer was 700 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Example 3]

In the same manner as in Example 1 except that the pulverizing medium having a diameter of 10 mm was used and the rotational speed of the planetary medium pulverizer was 500 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

Example 4

In the same manner as in Example 1 except that the pulverizing medium having a diameter of 10 mm was used and the rotational speed of the planetary medium pulverizer was 700 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

Comparative Example 1

In the same manner as in Example 1 except that the pulverizing medium having a diameter of 1 mm was used and the rotational speed of the planetary medium pulverizer was changed to 100 rpm, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 2]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 1 mm was used and the rotational speed of the planetary medium pulverizer was 300 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 3]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 1 mm was used and the rotational speed of the planetary medium pulverizer was 500 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 4]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 3 mm was used and the rotation speed of the planetary type pulverizer was 100 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 5]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 3 mm was used and the rotation speed of the planetary medium pulverizer was 300 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 6]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 3 mm was used and the rotation speed of the planetary type pulverizer was 500 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 7]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 5 mm was used and the rotation speed of the planetary medium pulverizer was changed to 100 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 8]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 5 mm was used and the rotational speed of the planetary type pulverizer was 300 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 9]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 5 mm was used and the rotation speed of the planetary type pulverizer was 500 rpm in Example 1, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 10]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 10 mm was used in Example 1 and the rotation speed of the planetary medium pulverizer was set at 100 rpm, a plate-like aluminum-carbon nanotube composite material .

[Comparative Example 11]

Using the same method as in Example 1 except that the pulverizing medium having a diameter of 10 mm was used in Example 1 and the rotational speed of the planetary medium pulverizer was set to 300 rpm, a plate-like aluminum-carbon nanotube composite material .

{evaluation}

[Experimental Example 1]

The surface of the aluminum-carbon nanotube composite material formed in each of Examples 1 to 4 was observed through SEM. The degree of particle shape change from the spherical to the plate-like surface of the aluminum-carbon nanotube composite material was evaluated, and the results are shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Grinding media (mm) 3 5 10 10 Rotational speed (rpm) 700 700 500 700 Evaluation of particle shape change ○ ○ ○ ○

As can be seen from the above Table 1, Examples 1 to 4 show that the shapes of the spherical aluminum-carbon nanotube composite material were changed to the plate-like aluminum-carbon nanotube composite material.

Specifically, the results of Example 1 are shown in Figs. 5A to 5B.

FIGS. 4A and 4B are SEM photographs of raw samples taken before the milling of the present invention, FIG. 4A is a SEM image of a raw sample of aluminum powder, FIG. SEM photographs of the raw samples of the samples.

FIGS. 5A and 5B are SEM images of the aluminum-carbon nanotube composite material according to the time of milling according to an embodiment of the present invention.

Referring to FIGS. 5A to 5B, the shape of the particles can be confirmed according to the time at which the milling is performed. At the initial stage of milling, a spherical aluminum-carbon nanotube composite material is formed (FIG. 5A) while the grain size tends to be slightly reduced (not shown) while the raw material state is maintained as it is and the milling time is further increased. It can be observed that the aluminum-carbon nanotube composite is a plate-like aluminum-carbon nanotube composite material and the particle shape changes.

In this process, the spherical aluminum-carbon nanotube composite material or the plate-like aluminum-carbon nanotube composite material can observe a shape in which carbon nanotubes are at least partially attached to the surface or inside of the aluminum powder, have.

[Experimental Example 2]

The particle shapes of the aluminum-carbon nanotube composite prepared according to Comparative Examples 1 to 3 were compared. Table 2 shows that the rotation speeds of the pulverizing media are different from each other in a state where the diameter of the pulverizing medium is fixed at 1 mm.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Grinding media (mm) One One One Rotational speed (rpm) 100 300 500 Evaluation of particle shape change × × ×

As shown in Table 2, spherical aluminum-carbon nanotube composite materials were formed when the milling media were fixed at a diameter of 1 mm and at rotational speeds of 100, 300 and 500 rpm, No carbon nanotube composite was formed. Therefore, it can be confirmed that the above conditions are not suitable for forming the plate-shaped aluminum-carbon nanotube composite material.

[Experimental Example 3]

The particle shapes of the aluminum-carbon nanotube composite prepared according to Example 1 and Comparative Examples 4 to 6 were compared. Table 3 shows that the rotating speeds of the pulverizing media are different from each other while the diameter of the pulverizing medium is fixed at 3 mm.

Comparative Example 4 Comparative Example 5 Comparative Example 6 Example 1 Size of Ball (mm) 3 3 3 3 Rotational speed (rpm) 100 300 500 700 Evaluation of particle shape change × × △ ○

As shown in Table 3, spherical aluminum-carbon nanotube composite material was formed when the milling media was fixed at a diameter of 3 mm and the rotation speed was 100 and 300 rpm, Tube composite was not formed. On the other hand, it was observed that the spherical aluminum-carbon nanotube composite material and the plate-like aluminum-carbon nanotube composite material were mixed at a rotation speed of 500 rpm. On the other hand, it was confirmed that only the plate-shaped aluminum-carbon nanotube composite exists at 700 rpm.

[Experimental Example 4]

The particle shapes of the aluminum-carbon nanotube composite prepared according to Example 2 and Comparative Examples 7 to 9 were compared. Table 4 shows that the rotation speeds of the pulverizing media are different from each other when the diameter of the pulverizing medium is fixed at 5 mm.

Comparative Example 7 Comparative Example 8 Comparative Example 9 Example 2 Grinding media (mm) 5 5 5 5 Rotational speed (rpm) 100 300 500 700 Evaluation of particle shape change × × △ ○

As shown in Table 4, when the milling medium was fixed at a diameter of 5 mm and the rotation speed was 100 rpm, only a spherical aluminum-carbon nanotube composite was formed, and a plate-like aluminum-carbon nanotube composite . On the other hand, it was observed that spherical aluminum-carbon nanotube composite material and plate-like aluminum-carbon nanotube composite material were mixed at a rotation speed of 300 and 500 rpm. On the other hand, it was confirmed that only the plate-shaped aluminum-carbon nanotube composite exists at 700 rpm.

[Experimental Example 5]

The particle shapes of the aluminum-carbon nanotube composite prepared according to Examples 3 to 4 and Comparative Examples 10 to 11 were compared. Table 5 shows that the rotation speeds of the pulverizing media are different from each other when the diameter of the pulverizing medium is fixed at 10 mm.

Comparative Example 10 Comparative Example 11 Example 3 Example 4 Grinding media (mm) 10 10 10 10 Rotational speed (rpm) 100 300 500 700 Evaluation of particle shape change × △ ○ ○

As shown in Table 5, when the milling medium was fixed at a diameter of 10 mm and the rotation speed was 100 rpm, only a spherical aluminum-carbon nanotube composite was formed, and a plate-like aluminum-carbon nanotube No composite material was formed. On the other hand, in the case of the rotation speed of 300 rpm, it was observed that a spherical aluminum-carbon nanotube composite material and a plate-like aluminum-carbon nanotube composite material were mixed. On the other hand, at 500 and 700 rpm, it was confirmed that only the plate-shaped aluminum-carbon nanotube composite was present.

Thus, referring to Tables 1 to 5, when the rotation speed was set to 700 rpm using an ultra-high-speed planetary medium pulverizer, regardless of the diameter of the pulverizing medium, after 5 minutes, And the like. Namely, the numerical conditions of the size, the rotating speed and the milling time of the pulverizing medium must be satisfied, so that the desired effect of the present invention can be achieved.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

Claims (9)

And milling the metal powder and carbon nanotubes using a planetary media mill to carry out milling. The method of claim 1,
Wherein the weight ratio of the metal powder to the carbon nanotubes is 10: 1. The method of claim 1, wherein the weight ratio of the metal powder to the carbon nanotubes is 10: 1. 3. The method of claim 2,
Wherein the milling medium has a diameter of 3 to 10 mm. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 1,
Wherein the milling is performed at 300 to 700 rpm for 4 to 70 minutes. ≪ RTI ID = 0.0 > 18. < / RTI > The method of claim 1,
Carbon nanotube composite material, wherein the metal powder and the carbon nanotube are 97 to 98 wt% and 2 to 3 wt%, respectively, based on the total weight of the mixed metal powder and the carbon nanotube. . The method of claim 1,
Wherein the metal powder is one selected from the group consisting of gold, silver, copper, aluminum, manganese, iron, tin, zinc and titanium. The method according to claim 6,
Carbon nanotube composite material according to claim 1, wherein the metal powder is aluminum. The method of claim 1,
Wherein the carbon nanotube is one or a mixture of two or more selected from the group consisting of a single-walled carbon nanotube, a double-walled carbon nanotube, a thin multi-walled carbon nanotube and a multi-walled carbon nanotube. Tube composite. The method of claim 8,
Wherein the carbon nanotubes have a diameter of 0.7 nm to 100 탆 and a length of 10 nm to 10 cm.

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