KR20140115399A - Methods of manufacturing aluminium - fine carbon material composites and high thermal insulating & high strength aluminium - fine carbon material composites manufactured by the methods - Google Patents

Methods of manufacturing aluminium - fine carbon material composites and high thermal insulating & high strength aluminium - fine carbon material composites manufactured by the methods Download PDF

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KR20140115399A
KR20140115399A KR20130017263A KR20130017263A KR20140115399A KR 20140115399 A KR20140115399 A KR 20140115399A KR 20130017263 A KR20130017263 A KR 20130017263A KR 20130017263 A KR20130017263 A KR 20130017263A KR 20140115399 A KR20140115399 A KR 20140115399A
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aluminum
carbon material
fine
fine carbon
composite
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KR20130017263A
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Korean (ko)
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박종길
박영우
노동환
이영희
소강표
금동훈
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주식회사 대유신소재
성균관대학교산학협력단
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Priority to KR20130017263A priority Critical patent/KR20140115399A/en
Priority to PCT/KR2013/002288 priority patent/WO2014129695A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
    • B22F2003/208—Warm or hot extruding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

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  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
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Abstract

Disclosed is a method for manufacturing an aluminum-fine carbon material composite. In order to manufacture the aluminum-fine carbon material composite, first of all, aluminum powder and the fine carbon material are dispersed so as to obtain a powder mixture of the aluminum-fine carbon material. Then, the powder mixture of the dispersed aluminum-fine carbon material is sintered and shaped. Thereafter, the sintered composite of the aluminum-fine carbon material is extruded with heat. According to the method for manufacturing the aluminum-fine carbon material composite, the aluminum-fine carbon material composite with excellent heat insulation and mechanical properties can be manufactured by a relatively simple process.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing an aluminum-micro carbon material composite having high thermal and high strength properties, and an aluminum-micro carbon material composite prepared by the method and a method for producing the aluminum- MANUFACTURED BY THE METHODS}

The present invention relates to a process for producing an aluminum-micro carbon material composite having high thermal and high strength properties and an aluminum-micro carbon material composite produced thereby.

Recently, due to continuous economic development and population increase, urban redevelopment projects are being actively carried out, and the construction of large-scale high-rise buildings is increasing. Buildings such as large high-rise buildings consume a great deal of energy in heating, cooling, and lighting, so a considerable amount of energy is wasted on the windows of buildings. Therefore, it is increasingly necessary to improve the energy efficiency by developing windows with high insulation effect in order to reduce the energy wasted in the windows. For example, it is urgently required to develop a heat insulation window that reduces the heat load of the building by cutting off the heat of sunlight in summer and reduces the heating load inside the building by preventing the loss of heat to the outside in winter.

Although PVC windows are mainly used to improve insulation performance, aluminum windows are mainly used for high-rise buildings because they can not be used for explosion-proof windows and curtain wells of high-rise buildings due to low mechanical properties of PVC windows. However, since the aluminum window has a very high thermal conductivity of about 230 W / mK, there is a problem of heat loss through the aluminum window.

In order to solve these problems, researches on aluminum composite materials having excellent heat insulating properties and high mechanical strength have been actively conducted.

It is an object of the present invention to provide a method for producing an aluminum-micro carbon material composite in which a fine carbon material is uniformly dispersed.

Another object of the present invention is to provide a high thermal and high strength aluminum-micro carbon material composite produced by the above method.

According to another aspect of the present invention, there is provided a method of manufacturing an aluminum-micro carbon material composite, comprising: preparing a mixed powder of an aluminum-fine carbon material by dispersing a fine carbon material in aluminum powder; Forming a high thermal aluminum-micro carbon material composite by sintering the aluminum-micro carbon material mixed powder under high temperature and pressure; And hot-extruding the sintered and formed high thermal aluminum-micro carbon material composite to form and manufacture a high thermal and high strength aluminum-micro carbon material composite.

Wherein the step of preparing the aluminum-fine carbonaceous material mixed powder comprises mixing the aluminum-carbon mixed powder and the ball mill in a ball mill container rotatably coupled to a rotatable disk in a first direction in a second direction opposite to the first direction, Injecting a ball; And rotating the disk and the ball mill for a predetermined time so that the ball mill ball rubs against the wall surface of the ball mill and the ball mill itself rotates to apply a mechanical impact to the aluminum-carbon mixed powders. have. The ratio of the rotational speed of the ball mill to the rotational speed of the disk may be 30% or more and 70% or less of the critical angular velocity ratio. The rotation speed of the disk may be 50 rpm or more and 500 rpm or less.

The fine carbon material may include at least one of a group consisting of a fine graphite plate, fine graphite fibers, fine carbon fibers, carbon nanofibers, and carbon nanotubes. The aluminum powders may be added so that the carbon material is about 0.1 to 50 wt% based on the weight of the aluminum powders.

The step of sintering and molding the aluminum-fine carbonaceous material mixed powder to form a high thermal insulation aluminum-fine carbonaceous material composite comprises: filling the dispersed aluminum-fine carbonaceous material mixed powder into a mold; And heating the dispersed aluminum-fine carbonaceous material mixed powders to a temperature of 200 to 600 ° C while applying a pressure of 50 MPa to 700 MPa to the dispersed aluminum-fine carbonaceous material mixed powder filled in the metal mold .

The step of hot-extruding the aluminum-micro carbon material composite to form and manufacture a high-heat-and high-strength aluminum-micro carbon material composite comprises: heating the aluminum-micro carbon material composite to a temperature of 200 to 600 ° C; Inserting the heated aluminum-micro carbon material composite into an extrusion die, and extruding the extrusion die by applying a pressure of 50 MPa to 700 MPa to the extrusion die.

According to the embodiment of the present invention, when the high thermal resistance high strength aluminum-fine carbonaceous material composite is manufactured, the aluminum-fine carbonaceous material composite having excellent heat insulating properties can be manufactured because the fine carbon material clusters are uniformly dispersed. Also, it is easy to apply in various fields because it has excellent moldability through extrusion. These high-strength, high-strength aluminum-carbonaceous material composites are lightweight and excellent in thermal insulation properties and can be applied to interior and exterior construction materials used in today's buildings. They are used for automobile, aircraft, spacecraft, ship Can also be used as a material of

FIG. 1 is a flowchart illustrating a method of manufacturing a high thermal and high strength aluminum-micro carbon material composite according to an embodiment of the present invention.
2 is a view for explaining a ball mill apparatus,
FIG. 3 is a view for explaining a force acting on the ball-ball inserted into the ball-mill container.
4 is a graph for explaining the degree of damage of the fine carbon material with respect to the ball mill processing time.
Fig. 5 is a graph showing a relationship between a material (RAW) made only of an aluminum material, an aluminum-fine carbonaceous material composite material (1 wt%) having a fine carbonaceous material content of 1 wt%, an aluminum-fine carbonaceous material composite material having a content of a fine carbonaceous material of 3 wt% (5wt%) of an aluminum-micro carbon material composite material (5wt%) having a fine carbon material content of 5wt% and a molding material (3wt%) of an aluminum-micro carbon material composite material These are the pictures.
6 is an electron micrograph (JEOL, JSM7000F) photograph of the aluminum-fine carbonaceous material mixture prepared according to Example 1
FIG. 7 is a graph for explaining the thermal conductivity according to the content of the fine carbon material shown in Table 1. FIG.
8 is a photograph showing the shape of the aluminum-micro carbon material composite after extrusion,
9 is a photograph showing the result of measurement of confocal Raman (Witec, CRM 200) after extrusion.
10 is a graph for illustrating the hardness according to the content of the fine carbon material shown in Table 2. FIG.
Fig. 11 is a cross-sectional scanning electron micrograph of the extruded sample of Example 1. Fig.
12 is a graph for explaining the thermal conductivity according to the content of the fine carbon material shown in Table 3. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having" is intended to designate the presence of stated features, elements, etc., and not one or more other features, It does not mean that there is none.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a flowchart illustrating a method of manufacturing a high thermal and high strength aluminum-micro carbon material composite according to an embodiment of the present invention. FIG. 2 is a plan view for explaining a ball mill apparatus, and FIG. 3 is a schematic view for explaining a force acting on a ball mill ball inserted into a ball mill.

Referring to FIG. 1, in order to produce an aluminum-micro carbon material composite according to an embodiment of the present invention, a micro carbon material is dispersed in aluminum powder to prepare aluminum-carbon mixed particles (S110) (S120). Then, the aluminum-micro carbon material composite material is hot-extruded to produce a high-thermal-conductivity high strength aluminum-micro carbon material composite (S130).

To prepare the aluminum-carbon mixed particles (S110), a fine carbon material cluster may first be mixed with the aluminum powders. In one example, the average diameter of the aluminum powders is preferably about 50 to 90 占 퐉, and the fine carbon material clusters have a first axial length of about 2 to 8 占 퐉 and a second axial length of about 0.5 to 10 占 퐉 in the form of an elliptical or circular cross- It is preferable to have a biaxial length. If the size of the fine carbon material clusters is larger than the above value, the mechanical properties of the composite may be deteriorated. If the size of the fine carbon material clusters is smaller than the above-mentioned value, Lt; / RTI >

As the fine carbon material, fine graphite plate, fine graphite fiber, fine carbon fiber, carbon nanofiber, carbon nanotube and the like can be used. The fine carbon material clusters may be added in an amount of about 1 to 5 wt.% Based on the total weight. When the content of the fine carbon material clusters is less than 1 wt.%, The effect of the fine carbon material on the thermal and mechanical properties of the composite is insignificant. When the content of the fine carbon material clusters exceeds 5 wt.%, There is a problem in that the mechanical properties of the substrate are deteriorated rapidly.

The aluminum-micro carbon material mixed powder can then be prepared from a mixture of aluminum powders and fine carbon material clusters using a ball mill process.

1, 2, and 3, a mixture of aluminum powder and fine carbon material clusters and a ball mill ball are introduced into a ball mill 130 rotatably coupled to the disk 110, followed by ball milling , A mechanical impact can be applied to a mixture of aluminum powders and fine carbon material clusters.

The disk 110 may rotate in a first direction X with respect to a first central axis (hereinafter referred to as an " idle axis ") located at the center O of the disk 110, Which is opposite to the first direction X with respect to the second central axis (hereinafter, referred to as a 'rotation axis') located at the center 'A1' of the ball-milled container 130, It can be rotated in two directions (Y). That is, the ball mill 130 can revolve about the idle axis by the rotation of the disk 110 and can rotate about the axis of rotation by the rotation of the ball mill 130 itself.

The material of the ball mill ball is not particularly limited, but a ball mill ball made of zirconia can be used to effectively apply an impact force to the aluminum powder and the fine carbon materials. The ball mill ball may have a diameter of about 3 to 50 mm, taking into account the impact forces that must be applied to the aluminum powder and fine carbon material clusters.

The disk 110 and the ball mill 130 may then be rotated such that the ball mill ball loaded into the ball mill 130 applies a mechanical impact to the aluminum powder and fine carbon material clusters. When the disc 110 and the ball mill 130 are rotated, the first centrifugal force Fr due to the revolving of the ball mill 130 and the rotation of the ball mill 130 The second centrifugal force Fp is applied. The first centrifugal force Fr acts in a direction in which the ball mill ball moves away from the revolving axis and the second centrifugal force Fp acts in the direction in which the ball mill ball moves away from the rotational axis. The magnitude or direction of the first and second centrifugal forces Fr and Fp varies depending on the position of the ball-mill ball. When the ball mill 130 rotates in a state where the disc 110 is rotating, the ball mill ball rotates in the same direction as the ball mill 130 due to the frictional force between the ball mill ball and the wall surface of the ball mill 130 . By the action of these forces, the ball-mill ball in the ball-mill container 130 can either (i) collide with aluminum powders and fine carbon material clusters, or (ii) move in contact with the aluminum powder and fine carbon material clusters, It is possible to perform the motion of friction by the rotation of the ball, that is, the motion of applying the mechanical impact force.

The mechanical impact force applied to the aluminum powder and fine carbon material clusters by the ball mill ball is affected by the pressure at which the ball mill ball presses the aluminum powders and the fine carbon material clusters, . That is, as the revolution speed of the ball mill container 130 increases, the pressure at which the ball mill ball presses the aluminum powder and the fine carbon material clusters increases. In the present invention, in order for the size of the fine carbon material clusters to be about 3 占 퐉 or less, the degree of damage of the fine carbon material to be 15% or less, and the micropores inside the clusters to have a size of about several hundreds nm or less, May be adjusted to be about 50 to 500 rpm. If the size of the micropores existing inside the composite is small, it affects the heat transfer characteristics of the composite but does not greatly affect the mechanical properties. Generally, it is reported that when the pore size in the interior of the composite is 0.5 mm or more, the mechanical properties of the composite are drastically degraded. Accordingly, in the present invention, in order to prevent deterioration of the mechanical properties of the final aluminum-micro carbon material composite and to improve the heat insulation property, the size of the micro pores present in the aluminum-micro carbon material mixed powder is controlled to be several hundreds nm or less do.

In the present invention, the rotation speed of the disk 110 and the ball mill 130 is controlled so that the ball mill ball can apply a mechanical shear force to the aluminum-micro carbon material mixture. The pneumatic centrifugal force Fr acting on the ball mill ball located closest to the revolving shaft in the inner space of the ball mill container 130 can be expressed by Equation 1 and can be expressed by the following equation 1, The centrifugal centrifugal force Fp acting on the ball mill ball can be expressed by Equation 2 below.

[Formula 1]

Figure pat00001

[Formula 2]

Figure pat00002

In the equations 1 and 2, 'm' represents the weight of the ball mill ball, 'R' represents the distance between the revolving axis and the rotation axis, that is, the orbital radius, 'Lc' 'W1' represents the revolution angular velocity, and 'w2' represents the rotation angular velocity.

The ratio of the rotation angular velocity w2 to the revolving angular velocity w1 when the revolving centrifugal force Fr acting on the ball mill ball located closest to the revolving shaft is equal to the rotating centrifugal force Fp acting on the ball mill ball ) 'w2 / w1' is a critical angular velocity ratio 'rc', the critical angular velocity ratio 'rc' can be derived from Equation 1 and Equation 2 and can be expressed as Equation 3 below.

[Formula 3]

Figure pat00003

In the present invention, the ratio of the rotation speed to the revolution speed of the ball mill 130 can be controlled to be about 30 to 70% of the critical angular speed ratio. In order to apply the mechanical shear force rather than the ball-mill ball colliding with the aluminum-fine carbonaceous material, the ratio of the rotation speed to the revolution speed (w2 / w1) becomes the critical angular speed ratio 0.0 > rc). < / RTI > That is, when the ratio of the rotation speed to the revolution speed (w2 / w1) exceeds 70% of the critical angular speed ratio (rc), the influence of the centrifugal force due to rotation increases so that the ball- It causes a collision exercise. Further, when the ratio (w2 / w1) of the rotation speed to the revolution speed is less than 30% of the critical angular rate ratio (rc), the rotational speed of the ball mill ball itself is low and the mechanical shear force applied to the fine carbon material becomes too small, As a result, the mixture of the aluminum powder and the fine carbonaceous material can not be deformed into a constant plate shape. The mechanical shear force applied to the aluminum-fine carbonaceous material mixture by the ball-mill ball is affected by the rotational speed of the ball-ball itself. The rotational speed of the ball-ball itself is determined by the rotational speed of the ball- That is, as the rotating speed of the ball mill container increases, the rotating speed of the ball ball itself increases.

To prevent aluminum powders and fine carbon material clusters from being oxidized, the interior of the ball mill 110 is preferably maintained in an inert gas atmosphere during the ball mill process. The ball mill process may be performed for about 5 minutes to 6 hours, preferably about 5 minutes to 40 minutes. The aluminum-fine carbonaceous material mixed powder can be prepared by the above process. If the ball mill processing time exceeds 40 minutes, the degree of damage of the fine carbon material may increase sharply.

4 is a graph for explaining the degree of damage of the fine carbon material with respect to the ball mill processing time. 4, a mixture of 95 wt.% Of aluminum powder and 5 wt.% Of carbon nanotube clusters was used as a sample. The ball mill process was performed under the conditions of revolution speed and rotation speed of 300 rpm and 200 rpm, respectively, The weight ratio of the crystalline carbon nanotubes was measured for 5 minutes, 10 minutes, 20 minutes, 40 minutes, and 60 minutes. The decrease in the weight ratio of the crystalline carbon nanotubes means that the degree of damage of the carbon nanotubes is increased.

Referring to FIG. 4, as the ball milling time increases, the degree of damage of the carbon nanotubes increases. Particularly, when the ball milling time exceeds 40 minutes, the degree of damage of the carbon nanotubes increases sharply Able to know.

In the aluminum-micro carbon material composite, the size and morphology of the fine carbon material clusters greatly affect the mechanical and thermal properties of the composite. For example, the smaller the size of the fine carbonaceous material in the same volume fraction, and the more platy than spherical, the better the mechanical properties of the composite. When the ball milling process is performed as described above, initially, aluminum powder is pulverized by mechanical impact and friction with the ball mill balls to be separated into main particles and satellite particles, and the fine carbon material clusters are also crushed and reduced in size, The shape is deformed into a plate shape, the cluster density is increased, and the internal pores are reduced. Thereafter, a continuous ball milling process produces fine carbon material clusters on the surface of the aluminum main particles, and aluminum-fine carbonaceous material mixed powder in which the aluminum satellite particles are bonded to the main particles and close to the plate.

Next, referring again to FIG. 1, in order to produce an aluminum-fine carbonaceous composite material by sintering the aluminum-fine carbonaceous material mixed powder produced (S120), the aluminum-fine carbonaceous material mixed powder is filled in a mold , Sintering is performed at a temperature of about 200 to 600 ° C for about 1 minute to 1 hour under a pressure of about 50 MPa to 700 MPa to plastic deform and sinter the aluminum-fine carbonaceous material mixed powder filled in the mold.

Next, in order to produce an aluminum-micro carbon material composite by hot extrusion of the aluminum-micro carbon material composite material (S130), the aluminum-micro carbon material composite material is heated at a temperature of about 200 to 600 DEG C for about 1 minute to 1 hour After heating, extrusion can be performed in a state of applying an applied pressure of about 50 MPa to 700 MPa using an extrusion mold.

In the case of the aluminum-micro carbon material composite produced according to the embodiment of the present invention, fine pores having a size of several tens nm or less are uniformly distributed in the interior. These micropores do not significantly affect the mechanical properties of the composite, but greatly improve the adiabatic properties of the composite. This is because the micropores have lower thermal conductivity than aluminum matrix or micro carbon material reinforcements. The micropores inside the composite are mainly formed inside the fine carbon material clusters, and are also formed at the interface between some aluminum matrix and the fine carbon material.

The adiabatic characteristics of the aluminum-fine carbonaceous material composite are greatly affected by the micropores existing in the fine carbonaceous material cluster. In order to improve the adiabatic property of the aluminum-fine carbonaceous material composite, uniform distribution of the fine carbonaceous material clusters In addition, it is required to uniformly control the pores in the fine carbon material clusters. In the present invention, by controlling the size of the aluminum powder and the fine carbon material clusters and controlling the conditions of the ball mill process, not only the fine carbon material clusters are uniformly distributed within the composite, but also the pores inside the fine carbon material clusters are uniformly formed As a result, the aluminum-micro carbon material composite produced according to the present invention not only has excellent heat insulating properties, but also has high mechanical properties.

Hereinafter, the present invention will be described in detail with reference to examples of the present invention. However, the present invention is not limited to the following examples.

[Examples 1, 2 and 3]

After mixing aluminum powder and fine carbon material clusters, aluminum - fine carbonaceous material mixed powders were prepared by ball milling. As to the total weight, fine carbon material clusters were added as 1 wt% (Example 1), 3 wt% (Example 2) and 5 wt% (Example 3), respectively. As the aluminum powder, aluminum powder having a size of about 70 μm purchased from Samcheon Chemical Co., Ltd. was used. As the fine carbon material, a multiwalled carbon nanotube having a thickness of about 10 to 20 nm and a length of about 10 to 20 μm (Model CM95) purchased from Mitsubishi Electric Corporation. The ball milling process was carried out using a steel ball mill (Tae Myung Science), 400g ball mill (zirconia) and a planetary mill (Model: Pulverisette 5) made of SKD 11 material. During the ball milling process, (10-2 torr) to maintain the argon (Ar) purged state.

Subsequently, the aluminum-fine carbon material mixed powders were put into a metal mold, and the upper and lower punches were fixed. Then, the aluminum-fine carbon material composite material was sintered at a temperature of 400 ° C for about 2 minutes, .

Subsequently, the aluminum-micro carbon material composite material sintered and molded was maintained at a temperature of 550 캜 for about 1 hour and extruded at a pressure of 600 MPa using an extruder. At this time, the temperature of the mold was 550 ° C. and the extrusion ratio was about 10.

[Experimental Example 1] - Evaluation of thermal mechanical properties

Fig. 5 is a graph showing a relationship between a material (RAW) made only of an aluminum material, an aluminum-fine carbonaceous material composite material (1 wt%) having a fine carbonaceous material content of 1 wt%, an aluminum-fine carbonaceous material composite material having a content of a fine carbonaceous material of 3 wt% (5wt%) of an aluminum-micro carbon material composite material (5wt%) having a fine carbon material content of 5wt% and a molding material (3wt%) of an aluminum-micro carbon material composite material These are the pictures.

Referring to FIG. 5, when the content of the fine carbon material is 6 wt.%, The content of the fine carbon material is too large to be sintered. That is, when the content of the fine carbon material exceeds 5 wt.%, There arises a problem that the sintering can not be performed. However, when the content of the fine carbon material is 5 wt.% Or less, it can be understood that the sintering can be well performed.

6 is an electron micrograph (JEOL, JSM7000F) photograph of the aluminum-fine carbonaceous material mixture prepared according to Example 1 and observed at 10,000X after 2 hours of ball milling.

Referring to FIG. 6, carbon nanotubes are uniformly dispersed on the surface of the aluminum powder.

Table 1 shows a sample (RAW) made only of an aluminum material, an aluminum-micro carbon material composite sample (Al-1 wt% CNT, Example 1) having a fine carbon material content of 1 wt%, a content of a fine carbon material of 3 wt% (Al-5 wt% CNT, Example 3) of the aluminum-micro carbon material composite sample (Al-3 wt% CNT, Example 2) and the aluminum-micro carbon material composite of which the content of the fine carbon material was 5 wt% FIG. 7 is a graph for explaining the thermal conductivity according to the content of the fine carbon material shown in Table 1. FIG. In order to measure the thermal properties of the sample, the specimen was processed to a thickness of 2 mm Φ12.5 mm and the thermal conductivity was measured at room temperature (about 25 ° C.) using a thermal conductivity meter (NETZCH, Laser Flash Apparatus 457).

Sample Test Temp.
(° C) Thermal conductivity
(W / mK) Rate of change
(%) Raw 25.9 245.0 - Al-1 wt% CNT 24.7 181.6 - 25.9 Al-3 wt% CNT 25.6 147.5 - 39.8 Al-5 wt% CNT 25.1 126.1 - 48.5

Referring to Table 1 and FIG. 7, it can be confirmed that the aluminum-micro carbon material composite (Example 1) having a content of 1 wt% of the fine carbon material as compared with the aluminum material (Raw) has a thermal conductivity reduced by 25.9%. The decrease in thermal conductivity can be interpreted as an increase in the adiabatic effect. The thermal conductivity of the aluminum-micro carbon material composite (Example 2) having a content of 3 wt% of the fine carbon material and the aluminum-micro carbon material composite (Example 3) having the content of 5 wt% of the fine carbon material were 39.8% , And 48.5%, respectively. That is, when the aluminum-micro carbon material composite is produced according to the embodiment of the present invention, the insulation property of the composite is improved as the content of the micro carbon material increases.

FIG. 8 is a photograph showing the shape of the aluminum-micro carbon material composite after extrusion, and FIG. 9 is a photograph showing the results of measurement of confocal Raman (Witec, CRM 200) after extrusion. In the confocal Raman measurement, G mode shows the peak of the carbon material as a yellow dot.

Referring to FIG. 9, it can be seen that the fine carbon material is uniformly dispersed even after extrusion.

Table 2 shows the results of the evaluation of the sample (RAW) of the aluminum material, the sample of the aluminum-micro carbon material composite (Al-1 wt% CNT, Example 1) having the fine carbon material content of 1 wt% and the content of the fine carbon material of 3 wt% FIG. 10 is a graph for explaining the hardness according to the content of the fine carbon material shown in Table 2. FIG. 10 is a graph showing the hardness of the sample of aluminum-fine carbonaceous material composite (Al-3 wt% CNT, Example 2) In order to measure the mechanical properties of the samples, the specimens were polished using a 1 μm alumina (Al 2 O 3) powder and measured with a Micro Vickers hardness tester (Mitutoyo) for 10 seconds under a load of 100 g.

Sample Hardness
(Hv) Rate of change
(%) Raw 27.6 - Al-1 wt% CNT 69.0 + 150.3 Al-3 wt% CNT 97.6 + 254.0

Referring to Table 2 and FIG. 10, it can be seen that the hardness of the aluminum-micro carbon material composite (Example 1) having a content of 1 wt% of the fine carbon material as compared with the aluminum material Raw increased by 150.3%. In addition, it can be confirmed that the hardness of the aluminum-micro carbon material composite (Example 2) having a content of 3 wt% of the fine carbon material is increased by 254.0%. It can be confirmed that the mechanical properties are remarkably improved as the content of the fine carbon material is increased.

Fig. 11 is a cross-sectional scanning electron micrograph of the extruded sample of Example 1. Fig.

Referring to FIG. 11A, it is confirmed that the carbon nanotubes are evenly dispersed on the aluminum surface (electron microscope 150,000X). Carbon nanotubes evenly dispersed in aluminum increase the mechanical properties by preventing the movement of dislocations generated in plastic deformation.

Referring to FIG. 11B, it can be seen that carbon nanotubes exist mainly in clusters (electron microscope 50,000X). At this time, fine-pores of several nanometers (nm) are present inside the carbon nanotube cluster. The thermal conductivity is lowered by the micropores. This is exactly the same as the values in Table 1.

[Experimental Example 2]

In Experimental Example 2, in order to measure a change in thermal conductivity at a high temperature, a sample made of aluminum (RAW), a sample of aluminum-fine carbonaceous material having a fine carbon material content of 1 wt% (Al-1 wt% CNT, ) And a sample of an aluminum-micro carbon material composite (Al-3 wt% CNT, Example 2) having a fine carbon material content of 3 wt% and an aluminum-micro carbon material composite of 5 wt% -5 wt% CNT, Example 3) was measured at about 100 캜. The size of the specimen and the measuring equipment were the same as in Experimental Example 1.

Table 3 shows a sample (RAW) of a material made of only aluminum, an aluminum-fine carbon material composite sample (Al-1 wt% CNT, Example 1) having a content of fine carbon material of 1 wt%, a content of fine carbon material of 3 (Al-5 wt% CNT, Example 3) of an aluminum-micro carbon material composite sample (Al-3 wt% CNT, Example 2) having a content of 5 wt% FIG. 12 is a graph for explaining the thermal conductivity according to the content of the fine carbon material shown in Table 3. FIG.

Sample Test Temp.
(° C) Thermal conductivity
(W / mK) Rate of change
(%) Raw 99.8 241.7 - Al-1 wt% CNT 99.9 183.5 - 24.1 Al-3 wt% CNT 99.7 147.7 - 38.9 Al-5 wt% CNT 100.0 129.4 - 46.5

Referring to Table 3 and FIG. 12, it can be seen that the aluminum-micro carbon material composite (Example 1) having a content of 1 wt% of the fine carbon material is 24.1% lower than that of the aluminum material Raw. The decrease in thermal conductivity can be interpreted as an increase in the adiabatic effect. The thermal conductivity of the aluminum-micro carbon material composite (Example 2) having a content of 3 wt% of the fine carbon material and the aluminum-micro carbon material composite (Example 3) having a content of 5 wt% of the micro carbon material was 38.9% , And 46.5%, respectively. That is, it can be seen that when the aluminum-micro carbon material composite is produced according to the embodiment of the present invention, the heat insulating property of the composite can be improved.

According to the above-described method for producing an aluminum-micro carbon material composite, an aluminum-micro carbon material composite can be mass-produced through a relatively simple process. In addition, the aluminum-micro carbon material composite produced according to the above-described manufacturing method has an increased heat insulating property and enhanced mechanical properties due to the uniform dispersion of the fine carbon material in aluminum. Accordingly, when the high-heat-and-high-strength aluminum-micro carbon material composite is used as a structural material such as an explosion-proof window for a high-rise building and an aluminum window for a curtain-like building, a structural material excellent in heat insulation properties and light in weight can be produced. Also, it has excellent heat insulation property even at high temperature and can be used as a heat insulating structural material for high temperature.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

Claims (9)

Dispersing fine carbon material clusters in aluminum powder to prepare an aluminum-fine carbonaceous material mixed powder;
Preparing an aluminum-micro carbon material composite material by sintering the aluminum-micro carbon material mixture powders; And
Hot-extruding the aluminum-micro carbon material composite material to produce an aluminum-micro carbon material composite. The high-strength, high-strength aluminum-fine carbonaceous material according to claim 1, wherein the fine carbonaceous material comprises at least one selected from the group consisting of a fine graphite plate, fine graphite fiber, fine carbon fiber, carbon nanofiber and carbon nanotube A method for producing a carbon material composite. The method according to claim 2, wherein the fine carbon material clusters are 1 to 5 wt.% Based on the total weight of the mixed powder. 2. The method of claim 1, wherein the aluminum powder has an average diameter of about 50 to 90 占 퐉, the fine carbon material cluster has an elliptical or circular cross-section, a length of 2 to 8 占 퐉 along the first axis, And the length along the second axis perpendicular to the first axis is 0.5 to 10 占 퐉. The method according to claim 1, wherein the step of preparing the aluminum-micro carbon material mixed powder is performed using a ball mill process in which the ball mill container revolves and revolves,
Wherein the revolution speed of the ball mill is from 50 rpm to 500 rpm. ≪ RTI ID = 0.0 > 11. < / RTI > 6. The method of claim 5, wherein the ball milling process is performed for 5 minutes to 6 hours,
Wherein the aluminum-fine carbonaceous material mixed powder after the ball milling process comprises the fine carbonaceous material cluster having a size of 3 mu m or less. The method of claim 1, wherein the step of fabricating the aluminum-
Filling the aluminum-fine carbon material mixed powders into a mold; And
And heating the mixed powder of the aluminum-fine carbonaceous material packed in the mold to a temperature of 200 to 600 캜 while applying a pressure of 50 MPa to 700 MPa. ≪ / RTI > The method of claim 1, wherein the step of preparing the aluminum-
Heating the aluminum-micro carbon material composite material to a temperature of 200 to 600 캜;
Inserting the heated aluminum-micro carbon material composite material into an extrusion die; And
And extruding the aluminum-micro carbon material composite material by applying a pressure of 50 MPa to 700 MPa to the extrusion die. 9. A high thermal and high strength aluminum-micro carbon material composite prepared by the method of any one of claims 1-8.
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