JP2019183281A - Aluminum/boron nitride nanotube composite and manufacturing method therefor - Google Patents

Abstract

To provide an Al/BNNT composite high in shape freedom and shape control property, and capable of reducing cost, and a manufacturing method of the Al/BNNT composite.SOLUTION: The Al/BNNT composite is a composite by composing BNNT in a metal base material, the metal base material consists of aluminum or aluminum alloy, the BNNT is dispersed in the metal base material and the metal base material is solidified.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique of a composite of a metal and a microfibrous material, and in particular, a composite in which boron nitride nanotubes are dispersed in a parent phase of aluminum or an aluminum alloy (hereinafter simply referred to as aluminum) (hereinafter referred to as aluminum / aluminum / aluminum alloy). The present invention relates to a boron nitride nanotube composite) and a method for producing the same.

  For the purpose of improving the mechanical properties of metal materials, research and development of techniques for adding and mixing microfibrous materials to metal base materials is underway. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2010-196098), a large number of fiber materials are entangled in a three-dimensional space, and a carbon nanomaterial (carbon nanotube, carbon nanofiber) is surfaced in a space surrounded by the fiber material. A metal matrix composite formed by impregnating and solidifying a molten metal into a preform in which a metal powder adhering to or contained in the metal is trapped is disclosed. An aluminum alloy or a magnesium alloy is used as the metal powder and the molten metal. It is disclosed.

  On the other hand, in recent years, boron nitride nanotubes have attracted attention as a microfibrous material. A boron nitride nanotube (hereinafter sometimes referred to as BNNT) is a nanotube (NT) in which a sheet in which nitrogen (N) atoms and boron (B) atoms are alternately bonded to form a cylindrical body. BNNT has mechanical properties equivalent to those of carbon nanotubes (CNTs), which are tubular bodies of carbon (C) atoms bonded, and is said to have high thermal stability.

  For example, in Non-Patent Document 1 (Yanming Xue et al., Materials and Design 88 (2015) 451-460), aluminum (Al) powder and boron nitride nanotubes (BNNT) are mixed and subjected to a high pressure of 5 GPa. A study of producing an aluminum / boron nitride nanotube composite (hereinafter referred to as an Al / BNNT composite) by a method of applying a twisting process (high-pressure twisting process) is disclosed.

JP 2010-196098 A

Yanming Xue et al., “Aluminum matrix composites reinforced with multi-walled boron nitride nanotubes fabricated by a high-pressure torsion technique”, Materials and Design, vol. 88 (2015), pp. 451-460.

  According to Patent Document 1 (Japanese Patent Laid-Open No. 2010-196098), it is said that a metal matrix composite excellent in lubricity, adhesion resistance, wear resistance, and thermal conductivity can be provided. However, at the present stage, new problems are the insufficient interfacial bonding between the aluminum matrix and the carbon nanomaterial, and the uniform dispersion and chemical stability of the carbon nanomaterial in the aluminum matrix. Has surfaced.

  According to Non-Patent Document 1 (Yanming Xue et al.), The obtained Al / BNNT composite has an amorphous ultrathin Al (BNO) layer (thickness of 2 to 5) in the interface region between Al and BNNT. nm) and the tensile strength at room temperature has been reported to be more than doubled (up to 420 MPa) compared to pure Al material. This shows the possibility of improving the mechanical properties by the Al / BNNT composite and is considered to be a very attractive report. However, since the technique of Non-Patent Document 1 uses a special manufacturing method called a high-pressure torsion processing method, it has a weak point in the shape flexibility and shape controllability of the composite and is processed into a desired shape as a structure. The manufacturing cost for doing so tends to be high.

  In order to put a new material such as an Al / BNNT composite into practical use (especially aiming to replace the existing material), the cost reduction of the new material is one of the most important issues. . If the Al / BNNT composite can be manufactured by a casting method, it is considered that the weakness of the shape freedom and shape controllability of the composite can be overcome and the manufacturing cost can be greatly reduced. The production of Al / CNT composites by a casting method is not considered suitable because CNTs cause a chemical reaction with molten Al to produce compounds such as carbides.

  Accordingly, an object of the present invention is to provide an Al / BNNT composite having a high degree of freedom in shape and shape controllability and capable of reducing the cost, and a method for producing the Al / BNNT composite.

(I) One embodiment of the present invention is a composite in which boron nitride nanotubes are combined with a metal matrix to achieve the above object,
The metal matrix is made of aluminum or an aluminum alloy,
The composite provides an aluminum / boron nitride nanotube composite characterized in that the boron nitride nanotubes are dispersed in the metal matrix and the metal matrix is solidified.

In the present invention, the following improvements and changes can be added to the Al / BNNT composite (I).
(I) The Al alloy may be an alloy containing Al as a main component and including one or more of silicon (Si), copper (Cu), magnesium (Mg), and nickel (Ni). In addition, the main component said here is a component of the maximum content rate.

(II) Another aspect of the present invention is a method for producing a composite in which boron nitride nanotubes are combined with a metal matrix to achieve the above object,
The metal matrix is made of aluminum or an aluminum alloy,
The manufacturing method comprises a powder mixing step of preparing a powder mixture of boron nitride nanotubes and a metal matrix-dissolvable element by mixing the powder of boron nitride nanotubes and a powder of an element soluble in the molten metal matrix When,
An alloy melt mixing step of preparing a boron nitride nanotube mixed metal matrix melt by mixing the powder mixture and the melt of the metal matrix,
And a casting step of solidifying the boron nitride nanotube mixed metal matrix melt to obtain the composite, and a method for producing an aluminum / boron nitride nanotube composite.
In the present invention, the molten metal matrix in the molten alloy mixing step may be a pure aluminum melt or an aluminum alloy melt.

In addition, the present invention can be modified or changed as follows in the above-described Al / BNNT composite production method (II).
(Ii) The metal matrix phase soluble element powder may be Si powder.
(Iii) The ratio of the specific surface area of the BNNT powder to the specific surface area of the powder of the metal matrix phase-dissolvable element can be less than 10.
(Iv) The mass ratio of the BNNT powder and the metal matrix phase-dissolvable element powder may be “1: 2” or more and “2: 1” or less.
(V) The Al alloy may be an alloy containing Al as a main component and including one or more of Si, Cu, Mg, and Ni.
(Vi) The powder mixing step includes a BNNT suspension preparation step of preparing a BNNT suspension by mixing the BNNT powder and an organic solvent,
A metal matrix-dissolvable element suspension preparation element step of preparing a metal matrix-dissolvable element suspension by mixing the metal matrix-dissolvable element powder and an organic solvent;
Preparing a BNNT / metal matrix-dissolvable element suspension by mixing the BNNT suspension and the metal matrix-dissolvable element suspension; ,
And an organic solvent removing element step of preparing the BNNT / metal matrix-soluble element powder mixture by removing the organic solvent from the BNNT / metal matrix-soluble element suspension. .

  According to the present invention, it is possible to provide an Al / BNNT composite having a high degree of freedom in shape and shape controllability and capable of reducing the cost, and a method for producing the Al / BNNT composite.

It is process drawing which shows an example of the manufacturing method of the Al / BNNT composite_body | complex which concerns on this invention. 2 is a scanning electron microscope (SEM) observation image of the BNNT / Si powder mixture of Example 1. FIG. 3 is an SEM observation image of a cross section near the surface of the Al / BNNT composite casting of Comparative Example 1. 2 is a SEM observation image of the surface of the Al / BNNT composite casting of Example 1. FIG.

[Initial study and basic idea of the present invention]
The present inventors have repeated research on a method of producing this composite by a casting method from the viewpoint of the degree of freedom of shape and shape controllability of the Al / BNNT composite. Among them, a cast was prepared by simply mixing Al molten metal and BNNT and then solidifying, and this cast was investigated. As a result, it was found that the experimental Al melt had poor wettability to BNNT, and the solidified Al matrix and BNNT were easily separated (details will be described later).

  In the present invention, “wet” means that the contact angle between a liquid phase (including a solidified liquid phase (original liquid phase)) and a solid phase (originally a solid phase) is 90 °. It means the following states. Furthermore, in the “wet state” as used in the present invention, the interface where the BNNT and the Al matrix contact each other can be confirmed in electron microscope observation (for example, SEM observation, TEM observation), and unwanted inclusions ( For example, it is desirable that no reaction compound, void, etc. of BNNT and Al exist.

  Hereinafter, the composite of the present invention will be described by taking a cast as an example.

  The present inventors made the following hypothesis with the aim of improving the wettability between the molten Al and BNNT. In order to improve the wettability between the molten Al and BNNT, it was thought that it was better to add both or at least components having a high affinity for the molten Al.

  Specifically, it was considered that a component that easily dissolves in the molten Al is preferable for the molten Al. When particles of an element that dissolves easily in molten Al (hereinafter referred to as a metal matrix soluble element, eg, Si, Cu, Mg, Ni) are present in the vicinity of the BNNT particle, the dissolution of the element particle progresses. At the same time, the chance of direct contact between the molten Al and the BNNT particles increased, and as a result, the dispersibility of the BNNT particles in the molten Al could be improved.

  Also, for boron nitride (BN), BN is a III-V group compound and it is said that its chemical properties are similar to those of group IV carbon (C). We thought that the affinity with BN was high (wetness between the Group IV element melt and BN was high). From these facts, it was considered that group IV elements are preferable as components that are easily dissolved in molten Al, and Si is particularly preferable. We thought that the addition of Si component could improve the wettability and dispersibility of molten Al and BNNT.

  In order to confirm this hypothesis, after preparing a powder mixture in which BNNT powder and Si powder were mixed, this powder mixture was mixed with Al molten metal and solidified to produce a composite. I investigated the body. As a result, it was confirmed that the wettability between the Al matrix and BNNT was improved. The present invention has been completed based on this finding.

  Hereinafter, an embodiment according to the present invention will be described along a manufacturing procedure with reference to the drawings. However, the present invention is not limited to the embodiments taken up here, and can be appropriately combined with or improved based on known techniques without departing from the technical idea of the invention. .

[Production method of Al / BNNT composite]
FIG. 1 is a process diagram showing an example of a method for producing an Al / BNNT composite according to the present invention. As shown in FIG. 1, the manufacturing method of the present invention includes a powder mixing step (S1) in which a BNNT / Si powder mixture is prepared by mixing BNNT powder and Si powder, a BNNT / Si powder mixture, A molten alloy mixing step (S2) for preparing a BNNT mixed Al alloy molten metal by mixing the molten Al alloy and a casting step (S3) for solidifying the BNNT mixed Al alloy molten metal to obtain an Al / BNNT composite.

  Although not shown in FIG. 1, the Al / BNNT composite obtained in the casting step S3 is used as a master ingot, and is poured into another Al alloy molten metal to be solidified to obtain an Al / BNNT composite. -A casting process (S4) may be performed. Further, after the casting step S3 and the remelting / casting step S4, a forming step (S5) for adjusting the outer shape of the Al / BNNT composite may be performed as necessary.

  Hereafter, each process of the manufacturing method of the Al / BNNT composite based on this invention is demonstrated more concretely.

(Powder mixing step S1)
As described above, this step is a step of preparing a BNNT / Si powder mixture by mixing BNNT powder and Si powder. There is no particular limitation on the BNNT used in the present invention, and commercially available BNNT powder can be used. For example, BNNT having an average diameter of 10 nm or less and an average length on the order of μm can be used. The BNNT is not limited to a single-layer structure, and nanotubes having a multilayer structure (for example, 2 to 10 layers) can be used.

In order to uniformly mix the two types of powders, it is generally preferable that the average sizes of the powders are approximately the same. Here, in the present invention, BNNT powder and Si powder are mixed. As described above, BNNT powder is a powder having a fibrous shape with an aspect ratio (length / diameter) of about 10 ² to 10 ^3. .

As a result of various studies by the present inventors, in the mixing of BNNT powder and Si powder, the specific surface area (unit: m ² / g) was adopted instead of the average size as the standard for selecting the size of the two types of powders. It has been found that it is preferable to control the specific surface area ratio of the BNNT powder and the Si powder to be less than 10. The specific surface area of each powder can be measured by, for example, a gas adsorption method (BET theory, BET formula).

  For the Si powder used in the present invention, nanoparticles are effective, and the specific surface area is preferably more than 1/10 and less than 10 times the specific surface area of the mixed BNNT powder, and 1/3 or more and 3 times or less Is more preferable. In addition, Si powder having a particle shape of irregularly shaped particles and scale-like particles (for example, about 10 to 30 nm in thickness and about 50 to 500 nm in diameter) intervenes between BNNT particles when mixed with BNNT powder. This is preferable in that an effect of suppressing entanglement between BNNT particles can be expected (see, for example, FIG. 2 described later). Other than that, there is no particular limitation, and commercially available Si powder can be used.

Furthermore, regarding the mixing amount of the BNNT powder and the Si powder, it is preferable to mix so that the ratio of the total surface area of the BNNT powder to the total surface area of the Si powder is 2 or less, and more preferably 1.5 or less. For example, when mixing BNNT powder (average diameter 4 nm, average hollow diameter 0.84 nm, specific surface area 400 m ² / g) and Si powder (average diameter 10 nm, specific surface area 200 m ² / g), BNNT powder It is preferable to mix Si powder having a mass twice that of the BNNT powder so that the total surface area of the Si powder and the total surface area of the Si powder are equal to each other, and the aggregation of the BNNT powder can be more effectively prevented by warping.

  Various mixing methods can be applied for mixing BNNT powder and Si powder. For example, the following elementary processes (BNNT suspension preparation process (S1a), Si suspension preparation element process (S1b)) BNNT / Si suspension preparation element process (S1c) and organic solvent removal element process (S1d)).

  The BNNT suspension preparation element process S1a is an element process for preparing a BNNT suspension by mixing BNNT powder and an organic solvent, and has an advantage that entanglement of BNNT can be easily solved. There are no particular limitations on the organic solvent used in the BNNT suspension preparation element process S1a. For example, alcohols (methanol, ethanol, 1-propanol, 2-propanol, etc.), ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.) ) Can be used.

  Similarly, the Si suspension preparation element step S1b is an elementary process for preparing an Si suspension by mixing Si powder and an organic solvent, and has an advantage that the aggregation of the Si powder is easily broken. The organic solvent used in the Si suspension preparation step S1b is not particularly limited. For example, alcohols (methanol, ethanol, 1-propanol, 2-propanol, etc.) and ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone) Etc.) can be used.

  The BNNT / Si suspension preparation element process S1c is an element process for preparing a mixed suspension (referred to as BNNT / Si suspension) in which the BNNT suspension and the Si suspension are mixed. From the viewpoint of final uniform mixing, the BNNT suspension and the Si suspension should be mixed so that the mass ratio of the BNNT powder to the Si powder is “1: 2” to “2: 1”. It is more preferable to mix so that it may become "1: 1.5"-"1.5: 1".

  The organic solvent removing element step S1d is an elementary process for preparing a mixture of BNNT powder and Si powder (referred to as BNNT / Si powder mixture) by removing the organic solvent from the BNNT / Si suspension. There is no particular limitation on the method for removing the organic solvent. However, when the amount of organic solvent in the BNNT / Si suspension is relatively large, for example, after roughly solid-liquid separation by filtration or the like, BNNT / Si for the solid phase A method of drying the powder mixture can be preferably used.

  In the above description, the BNNT / Si powder mixture has been described as an example. However, as described above, the BNNT powder is a powder of another element (for example, Cu, Mg, Ni) that is easily dissolved in an Al molten metal other than Si. It can be expected that the same effect can be obtained as a mixture of This is because the metal powder of these elements has an effect of infiltrating the Al melt in the vicinity of BNNT when it is melted in the Al melt.

(Alloy melt mixing process S2)
This step is a step of preparing a BNNT mixed Al alloy molten metal by mixing a BNNT / Si powder mixture and an Al molten metal. There is no particular limitation on the method of mixing the BNNT / Si powder mixture and the molten Al, but to prevent the powder mixture from scattering and to ensure that the BNNT is buried in the molten Al, the BNNT / Si powder mixture A method in which the body is packaged with an Al foil or an Al container and the Al package is put into the molten Al is preferred.

  In the present invention, the Al molten metal used here may be a pure Al molten metal or an Al alloy molten metal. Pure Al is defined as aluminum having a purity of 99.0% or higher.

  In the case of an Al alloy molten metal, an Al alloy having a chemical composition capable of forming a eutectic structure is preferable. For example, aluminum alloy for casting as specified in JIS H 5202 (AC1A: Al-Cu alloy, AC1B: Al-Cu-Mg alloy, AC2A, AC2B: Al-Cu-Si alloy, AC3A: Al- Si alloy, AC4A, AC4C, AC4CH: Al-Si-Mg alloy, AC4B: Al-Si-Cu alloy, AC4D, AC8C: Al-Si-Cu-Mg alloy, AC5A: Al-Cu-Ni- Mg based alloys, AC7A: Al-Mg based alloys, AC8A, AC8B: Al-Si-Cu-Ni-Mg based alloys, AC9A, AC9B: Al-Si-Cu-Mg-Ni based alloys) can be preferably used. . In other words, the molten Al alloy used in this step is a molten Al alloy containing Al as a main component and containing one or more of Cu, Mg, Si, and Ni.

  In addition, as described in JIS H 5202, the aluminum alloy for casting includes, in addition to Cu, Mg, Si and / or Ni, zinc (Zn), iron (Fe), manganese (Mn), One or more of titanium (Ti), lead (Pb), tin (Sn), and chromium (Cr) may further be included.

(Casting process S3)
This step is a step of solidifying the BNNT mixed Al alloy melt to obtain an Al / BNNT composite. There is no particular limitation on the casting method to be solidified, and a conventional method can be used.

  Through the above steps, the Al / BNNT composite according to the present invention can be obtained.

  Hereinafter, specific examples of the present invention will be described in more detail by way of examples.

[Experiment 1]
(Production of Example 1)
A casting (hereinafter referred to as an Al / BNNT composite casting) which is an Al / BNNT composite of Example 1 was produced according to the manufacturing method described above. First, 1 g of BNNT powder (average diameter 5 nm, specific surface area> 100 m ² / g) was put into 100 mL of ethanol and subjected to ultrasonic stirring for 1 hour to prepare a BNNT suspension (BNNT suspension). Suspension preparation process S1a). For measuring the specific surface area, a vapor adsorption amount measuring device (Microtrac Bell, BELSORP-max II) was used.

Similarly, 1 g of Si powder (a flaky particle having an average thickness of 30 nm and an average diameter of 400 nm, a specific surface area of more than 100 m ² / g) is put into 100 mL of ethanol and subjected to ultrasonic stirring. The Si suspension was prepared after a while (Si suspension preparation element process S1b).

  Next, mix the total amount of the prepared BNNT suspension and the entire amount of the Si suspension, and further carry out ultrasonic stirring for 1 hour to obtain a BNNT / Si suspension (BNNT powder 1 g: Si powder 1 g, total 200 mL). (BNNT / Si suspension preparation element process S1c).

  Next, the BNNT / Si suspension was filtered, and the solid phase was dried to prepare a BNNT / Si powder mixture (organic solvent removing element step S1d). FIG. 2 is a scanning electron microscope (SEM) observation image of the BNNT / Si powder mixture of Example 1. As shown in FIG. 2, it is confirmed that the BNNT particles 10 and the Si particles 20 are uniformly mixed. Further, it can be seen that the entanglement of the BNNT particles is suppressed by the Si particles 20 being interposed between the BNNT particles 10.

  Next, the prepared BNNT / Si powder mixture was packaged with Al foil (commercially available aluminum foil) to prepare an Al package. Next, the Al package is put into the molten Al alloy (AC4CH: Al-7 mass% Si-0.3 mass% Mg alloy, 1 kg, 700 ° C) prepared in the graphite crucible, and stirred and mixed for 1 hour. It was. Thereafter, the graphite crucible was taken out of the furnace and the BNNT / Si mixed Al alloy melt was air-cooled and solidified to obtain the Al / BNNT composite casting of Example 1.

(Production of Example 2)
An Al / BNNT composite casting of Example 2 was produced in the same manner as in Example 1 except that pure Al molten metal (A1100, 1 kg, 700 ° C.) was used.

(Production of Comparative Example 1)
An Al / BNNT composite casting of Comparative Example 1 was produced in the same manner as in Example 1 except that Si powder was not mixed with BNNT powder.

[Experiment 2]
(Microstructure observation of Al / BNNT composite)
For each of the Al / BNNT composite castings of Example 1, Example 2 and Comparative Example 1, the microstructure near the surface of the casting was observed. FIG. 3 is an SEM observation image of a cross section near the surface of the Al / BNNT composite casting of Comparative Example 1. 4 is an SEM observation image of the surface of the Al / BNNT composite casting of Example 1. FIG.

  As shown in FIG. 3, in Comparative Example 1, it is confirmed that the BNNT particles 10 and the Al alloy matrix 30 are separated. This suggests that the molten Al alloy was not sufficiently wetted with the BNNT particles before solidification. On the other hand, in Example 1, as shown in FIG. 4, the BNNT particles 10 are uniformly dispersed and well mixed with the Al alloy matrix 30. In particular, it is confirmed that the BNNT particles 10 are embedded inside the Al alloy matrix 30 and integrated. In Example 2, the same microstructure as in Example 1 was observed. This suggests that the molten Al alloy was sufficiently wetted with the BNNT particles before solidification.

  In both cases, Example 1 and Comparative Example 1 use AC4CH (Al—Si—Mg alloy) containing a Si component as the Al alloy melt in which the BNNT powder is mixed. Moreover, in Example 2, Si component is not contained in Al molten metal before supplying a BNNT / Si powder mixture. Considering these facts, it is not possible to discuss the cause of the clear difference as described above in the wettability between the molten metal and BNNT only by the presence or absence of the Si component in the Al / BNNT composite casting.

  Unfortunately, the detailed mechanism has not been elucidated at this stage, but at least the mixture of BNNT powder and Si powder (BNNT / Si powder mixture) is mixed into the molten metal to progress the dissolution of Si powder. At the same time, the chances of direct contact between the molten Al and BNNT particles increased, and the wettability and dispersibility are considered to have improved. Thus, it can be said that the present invention shows a very interesting phenomenon.

  The above-described embodiments and examples are described in order to facilitate understanding of the present invention, and the present invention is not limited to the specific configurations described. For example, it is possible to replace a part of the configuration of the embodiment with the configuration of common technical knowledge of those skilled in the art, and it is also possible to add the configuration of technical common sense of those skilled in the art to the configuration of the embodiment. That is, according to the present invention, a part of the configurations of the embodiments and examples of the present specification may be deleted, replaced with other configurations, and added with other configurations without departing from the technical idea of the invention. Is possible.

  10 ... BNNT particles, 20 ... Si particles, 30 ... Al alloy matrix.

Claims (8)

A composite in which boron nitride nanotubes are combined with a metal matrix,
The metal matrix is made of aluminum or an aluminum alloy,
The composite is an aluminum / boron nitride nanotube composite, wherein the boron nitride nanotubes are dispersed in the metal matrix and the metal matrix is solidified. The aluminum / boron nitride nanotube composite of claim 1,
The aluminum / boron nitride nanotube composite characterized in that the aluminum alloy is an alloy containing aluminum as a main component and at least one of silicon, copper, magnesium and nickel. A method for producing a composite in which boron nitride nanotubes are combined with a metal matrix,
The metal matrix is made of aluminum or an aluminum alloy,
The manufacturing method comprises preparing a powder mixture of boron nitride nanotubes and metal matrix-dissolvable elements by mixing the boron nitride nanotube powders and elemental powders soluble in the metal matrix melt Process,
An alloy melt mixing step of preparing the boron nitride nanotube mixed metal matrix melt by mixing the powder mixture and the melt of the metal matrix,
A casting step of solidifying the boron nitride nanotube mixed metal matrix melt to obtain the composite;
A method for producing an aluminum / boron nitride nanotube composite comprising:   4. The method for producing an aluminum / boron nitride nanotube composite according to claim 3, wherein the metal matrix phase-dissolvable element powder is a silicon powder. In the manufacturing method of the aluminum / boron nitride nanotube composite according to claim 3 or 4,
A method for producing an aluminum / boron nitride nanotube composite, wherein a ratio of a specific surface area of the boron nitride nanotube powder to a specific surface area of the metal matrix phase soluble element powder is less than 10. In the manufacturing method of the aluminum / boron nitride nanotube composite as described in any one of Claims 3 thru | or 5,
A method for producing an aluminum / boron nitride nanotube composite, wherein a mass ratio of the boron nitride nanotube powder to the metal matrix soluble element powder is "1: 2" or more and "2: 1" or less . In the manufacturing method of the aluminum / boron nitride nanotube composite as described in any one of Claims 3 thru | or 6,
The method for producing an aluminum / boron nitride nanotube composite, wherein the aluminum alloy is an alloy containing aluminum as a main component and at least one of silicon, copper, magnesium and nickel. The method for producing an aluminum / boron nitride nanotube composite according to any one of claims 3 to 7,
The powder mixing step comprises preparing a boron nitride nanotube suspension by mixing the boron nitride nanotube powder and an organic solvent;
A metal matrix-dissolvable element suspension preparation element step of preparing a metal matrix-dissolvable element suspension by mixing the metal matrix-dissolvable element powder and an organic solvent;
A boron nitride nanotube / metal matrix soluble element suspension is prepared by mixing the boron nitride nanotube suspension and the metal matrix soluble element suspension to prepare a boron nitride nanotube / metal matrix soluble element suspension. A suspension preparation process,
Removing the organic solvent from the boron nitride nanotube / metal matrix soluble element suspension to prepare the boron nitride nanotube / metal matrix soluble element powder mixture;
A method for producing an aluminum / boron nitride nanotube composite comprising:

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