CN114043785B - Light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and preparation method thereof - Google Patents

Light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and preparation method thereof Download PDF

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CN114043785B
CN114043785B CN202111316299.8A CN202111316299A CN114043785B CN 114043785 B CN114043785 B CN 114043785B CN 202111316299 A CN202111316299 A CN 202111316299A CN 114043785 B CN114043785 B CN 114043785B
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nano tube
carbon nano
composite material
carbon nanotube
aluminum composite
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CN114043785A (en
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王耿洁
张耀尹
皇志富
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Xian Jiaotong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/162—Cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and a preparation method thereof, wherein a exertional organic solvent is adopted to carry out surface treatment on a carbon nano tube film to obtain a surface densified carbon nano tube film; thinning the densified carbon nano tube film to prepare a carbon nano tube film with thinned partial area and integrally interconnected; preparing an aluminum foil matrix; stacking the carbon nano tube film and the aluminum foil matrix layer by layer, and preparing a carbon nano tube film/aluminum composite material preform by adopting a hot-press sintering process; and obtaining the carbon nano tube film/aluminum composite material through vacuum sintering. The invention has simple operation and low cost, is easy to amplify industrialization, and is suitable for large-scale preparation and popularization.

Description

Light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of nano composite materials, and particularly relates to a light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and a preparation method thereof.
Background
Aluminum-based composite materials are widely used as light materials in the fields of automobile industry, aerospace and the like by virtue of excellent physical and chemical properties. Common reinforcing phases for reinforcing the aluminum matrix are carbon nanotube films, ceramics, graphene, and the like. The carbon nanotube film is formed by intertwining and linking a plurality of carbon nanotubes, the acting force among the nanotubes is Van der Waals force, the thickness of the carbon nanotube film is more than monoatomic molecules and less than millimeter level, and the carbon nanotube film has the characteristics of flexibility, high electrical conductivity, high thermal conductivity and the like. The carbon nano tube film/aluminum composite material is a metal-based composite material which takes the carbon nano tube film as a reinforcing phase and aluminum foil as a matrix, and can realize the improvement of electric conduction and heat conduction properties while reducing the density of the material, so that the composite material has more excellent properties.
The common method for preparing the carbon nano tube film reinforced metal matrix composite material generally directly processes a metal matrix and a carbon nano tube film into a carbon nano tube/metal composite material under a high pressure condition; however, the densification degree of the carbon nanotube film is high, the base chain segment is long and the combination is tight, so that the wettability between the metal and the carbon nanotube film is poor, the surface combination strength of the composite material is low, the interface combination is not tight, and the mechanical property, the electric conductivity, the heat conductivity and the like of the composite material are affected. The method for improving the interface bonding strength is to adopt an adhesive between layers of the composite material, but the residual high-molecular adhesive can influence the electric conductivity, the heat conductivity and the like of the composite material.
Therefore, enhancing the surface bonding strength between the carbon nanotube film and the metal matrix is a key point of research in the preparation of carbon nanotube/metal composites.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and a preparation method thereof, which fully exert the radial high-heat-conductivity advantage of the carbon nano tube and prepare the carbon nano tube film/aluminum composite material with high heat conductivity.
The invention adopts the following technical scheme:
the preparation method of the light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material comprises the following steps:
s1, performing surface treatment on a carbon nano tube film by using a exertive organic solvent to obtain a surface densified carbon nano tube film;
s2, thinning the densified carbon nanotube film prepared in the step S1 to prepare a carbon nanotube film with thinned partial regions and integrally interconnected;
s3, preparing an aluminum foil matrix;
s4, stacking the carbon nanotube film prepared in the step S2 and the aluminum foil matrix prepared in the step S3 layer by layer, and preparing a carbon nanotube film/aluminum composite material preform by adopting a hot-press sintering process;
and S5, carrying out vacuum sintering on the carbon nano tube film/aluminum composite material preform prepared in the step S4 to obtain the carbon nano tube film/aluminum composite material.
Specifically, in step S1, the thickness of the surface densified carbon nanotube film is 5 to 100 μm.
Specifically, in step S2, the partial area is a continuous or discontinuous pattern, accounting for 10% -80% of the whole carbon nanotube film area.
Specifically, in step S2, the thinning treatment is performed by laser cutting, electron beam cutting or solution etching, the cutting depth is 5-100 μm, the aperture is 100-200 μm, the center distance between two adjacent holes is 300-500 μm, and the cutting shape is a regular or irregular pattern of array distribution or non-array distribution.
Specifically, the step S3 specifically includes:
and (3) placing the aluminum foil in absolute ethyl alcohol for cleaning for 3-5 min, and obtaining the aluminum foil matrix with clean surface after the organic solvent volatilizes, wherein the thickness of the aluminum foil matrix is 5-50 mu m.
Specifically, in step S4, the number of layers of the composite preform is 2 to 20.
Specifically, in step S4, in the stacking process, the etched surfaces of the carbon nanotube films face the same direction.
Specifically, in step S5, the vacuum sintering mode adopts a vacuum hot pressing mode specifically including:
the pressure is applied to be 0-32 MPa, the heating speed is 5-30 ℃/min, the sintering temperature is 200-600 ℃, the heat preservation time is 0-2 h, and the temperature is reduced to room temperature along with a furnace after the sintering is finished, so that the carbon nano tube film/aluminum composite material is obtained.
Specifically, in step S5, the vacuum sintering mode adopts an electric spark plasma sintering mode, specifically:
the sintering pressure is 25-32 MPa, the heating speed is 15-20 ℃/min, the sintering temperature is 400-450 ℃, the temperature is kept for 1-2 h, and the temperature is reduced to room temperature along with a furnace after the sintering is finished, so that the carbon nanotube film/aluminum composite material is obtained.
The invention adopts another technical scheme that the light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material has the thickness of 140-180 mu m and the heat conductivity of 570-630W/mK.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a preparation method of a light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material, which is characterized in that a carbon nano tube film with a thinned partial area is prepared on the surface of the carbon nano tube film through thinning treatment, so that defects on the surface of the carbon nano tube are reduced; and finally, the light layered interconnected carbon nano tube film/aluminum composite material with high heat conductivity is obtained through vacuum sintering, and the layered interconnected structure can fully play the advantage of high radial heat conductivity of the carbon nano tube.
Further, the thickness of the surface densified carbon nanotube film is 5-100 μm, and the excessively thick carbon nanotube film is unfavorable for the diffusion of metal elements and is easily damaged in the subsequent hot pressing process.
Further, the partial area is continuous or discontinuous pattern, accounting for 10% -80% of the whole carbon nano tube film area, and the enhancement effect of the carbon nano tube is not obvious when the etching pattern area is lower than 10% and higher than 80%.
Further, the cutting or etching process of the carbon nanotube film may form interconnections between layers in the composite.
Furthermore, the aluminum foil is subjected to ultrasonic treatment in absolute ethyl alcohol, so that the surface oxide layer and pollution can be removed, and the interfacial binding force of the aluminum foil and the carbon nano tube film is improved.
Further, when the number of the prefabricated body layers is 2-20, the diffusion effect of the composite material is optimal, and when the number of the prefabricated body layers is more than 20, the interlayer diffusion is insufficient.
Furthermore, the etched surfaces of the carbon nanotube films face the same direction, so that the interlayer tissue distribution of the composite material after being molded can be ensured to be uniform.
Further, the vacuum sintering can avoid oxidation of the carbon nanotube film and the aluminum foil, promote interlayer diffusion and improve interface binding force.
The light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material fully exerts the advantage of high radial heat transfer efficiency of the carbon nano tube, and has the characteristics of simple preparation process and high heat transfer efficiency.
In conclusion, the preparation method is simple and convenient to operate, low in cost, easy to amplify industrialization and suitable for large-scale preparation and popularization.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a structure of a hole-type layered interconnected carbon nanotube/aluminum composite material;
FIG. 3 is a schematic diagram of a triangular layered interconnected carbon nanotube/aluminum composite structure.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, all embodiments and preferred methods of implementation mentioned herein may be combined with each other to form new solutions, unless otherwise specified.
In the present invention, all technical features mentioned herein and preferred features may be combined with each other to form new technical solutions, unless otherwise specified.
In the present invention, the percentage (%) or parts refer to weight percentage or parts by weight relative to the composition unless otherwise specified.
In the present invention, the components or preferred components thereof may be combined with each other to form a new technical solution, unless otherwise specified.
In the present invention, unless otherwise indicated, the numerical ranges "a-b" represent shorthand representations of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed throughout, and "6-22" is only a shorthand representation of a combination of these values.
The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits and one or more upper limits, respectively.
In the present invention, the term "and/or" as used herein refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In the present invention, each reaction or operation step may be performed sequentially or sequentially unless otherwise indicated. Preferably, the reaction processes herein are performed sequentially.
Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present invention.
The invention provides a light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material, which comprises an aluminum foil serving as a matrix and a carbon nano tube film serving as a reinforcing phase and thinned in a partial area. The carbon nano tube film with the thinned partial area is prepared by laser etching, and the layered carbon nano tube/aluminum composite material is prepared by an electric spark plasma sintering method, so that good interface combination between aluminum and the carbon nano tube is realized, and the heat conductivity of the composite material is improved on the premise of not reducing the mechanical property. The preparation method is simple and convenient to operate, low in cost, easy to amplify industrialization and suitable for large-scale preparation and popularization.
Referring to fig. 1, the preparation method of the light high-thermal-conductivity layered interconnected carbon nano tube/aluminum composite material of the invention comprises the following steps:
s1, treating the carbon nano tube film by using a exertive organic solvent to obtain a densified carbon nano tube film;
immersing the carbon nano tube film into a exertive organic solvent to enable the carbon nano tube film to be completely immersed in the organic solvent and then taken out, and obtaining the densified carbon nano tube film after the organic solvent is completely volatilized, wherein the thickness of the carbon nano tube film is 5-100 mu m.
The exertive organic solvent is one or more of ethanol, acetone, sulfuric acid, nitric acid and hydrochloric acid solution.
S2, thinning the densified carbon nanotube film prepared in the step S1, and preparing a carbon nanotube film with thinned partial regions and integrally interconnected carbon nanotube films, wherein the partial regions are 10% -80% of the whole carbon nanotube film regions;
the thinning method is one of laser cutting, electron beam cutting and solution etching, the thinning area is a continuous or discontinuous pattern, the cutting depth is 5-100 μm, the cutting shape comprises a regular or irregular pattern distributed in an array or non-array, and the thermal conductivity of the composite material is regulated by regulating the area, distance and depth parameters of the pattern.
The larger the pattern area, the higher the thermal conductivity of the composite at the same distance and depth. The smaller the distance, the higher the thermal conductivity of the composite under the same area and depth conditions. The deeper the depth, the higher the thermal conductivity of the composite under the same area and distance conditions.
The etching depth is complete penetration, the aperture is 100-200 mu m, and the center distance of two adjacent holes is 300-500 mu m.
The laser cutting is specifically as follows:
providing a laser emission device and an objective table, flatly placing the carbon nanotube film on one surface of the objective table opposite to the laser emission device, flattening and fixing the carbon nanotube film, and ensuring the surface smoothness of the film; adjusting the relative position of the objective table and the laser emission point to enable the focus of the laser to be positioned at the position to be processed of the carbon nano tube film; and adjusting the current intensity and the processing power of the laser, and starting laser etching.
S3, preparing aluminum foil, and performing surface treatment on the prepared aluminum foil to obtain an aluminum foil matrix with the thickness of 5-50 mu m;
cutting by a laser cutting method to obtain aluminum foil, placing the cut aluminum foil in absolute ethyl alcohol, performing ultrasonic cleaning for 3-5 min, and volatilizing an organic solvent to obtain an aluminum foil matrix with a clean surface.
S4, stacking the carbon nanotube film prepared in the step S2 and the aluminum foil matrix prepared in the step S3 layer by layer, and preparing a carbon nanotube film/aluminum composite material preform by adopting a hot-press sintering process;
and (3) always arranging the etched surface of the carbon nano tube film subjected to laser treatment in the step (S2) with the same orientation and the aluminum foil matrix prepared in the step (S3) alternately, wherein the number of layers of the composite material preform is 2-20.
The hot press sintering process comprises a hot press process which promotes the material composition by any pressurizing mode and heating mode.
The carbon nanotube film and the aluminum foil matrix are not limited to be sequentially arranged in the stacking sequence of 1:1, the number of layers is any, and the thickness of the composite material is adjusted by adjusting the number of layers.
And S5, loading the carbon nano tube film/aluminum composite material prefabricated body prepared in the step S4 into a die, and obtaining the carbon nano tube film/aluminum composite material through vacuum sintering.
The mold comprises a graphite mold, a metal mold and a nonmetal mold.
The vacuum sintering mode is vacuum hot pressing or spark plasma sintering.
The vacuum hot pressing is specifically as follows:
placing the carbon nano tube film/aluminum composite material preform in a metal mold, placing the metal mold into a vacuum sintering furnace, applying the pressure of 0-32 MPa, the heating speed of 5-30 ℃/min, the sintering temperature of 200-600 ℃, the heat preservation time of 0-2 h, and cooling to room temperature along with the furnace after sintering to obtain the carbon nano tube film/aluminum composite material.
The electric spark plasma sintering is specifically as follows:
placing the carbon nano tube/aluminum composite material preform in a graphite mold, smearing a release agent in advance in the graphite mold, and placing graphite paper in order that the composite material after sintering can be smoothly released; secondly, placing the graphite die into a sintering device, setting the sintering pressure to be 25-32 MPa, heating up to 15-20 ℃/min, keeping the sintering temperature to be 400-450 ℃, preserving heat for 1-2 h, and cooling to room temperature along with a furnace after sintering to obtain the carbon nanotube film/aluminum composite material.
Referring to FIG. 2, the light high-thermal-conductivity layered interconnected carbon nano tube/aluminum composite material has the thickness of 140-180 μm and the thermal conductivity of 570-630W/mK.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Firstly, soaking a carbon nano tube film in an ethanol solvent, standing for 30 minutes, taking out, and naturally volatilizing ethanol until the thickness of the carbon nano tube film is 5 mu m;
then, carrying out etching treatment on the carbon nano tube film by adopting a laser machine, wherein an etching pattern is shown in fig. 2, the etching depth is completely penetrated, the aperture is 100 mu m, and the center distance between two adjacent holes is 300 mu m;
subsequently, sequentially and crosswise stacking an ultrasonic-treated aluminum foil matrix and a carbon nano tube film in a die, wherein the thickness of the aluminum foil matrix is 5 mu m;
finally, carrying out hot-pressing sintering treatment, wherein the hot-pressing temperature is 400 ℃, the pressure maintaining time is 1 hour, the pressure is 20MPa, the aluminum foil substrate is 1 layer, the carbon nano tube film is 1 layer, and the total number of the layers is 2;
a carbon nanotube/aluminum composite material having a total thickness of 8 μm and a thermal conductivity of 600W/mK was obtained.
Example 2
Firstly, soaking a carbon nano tube film in an ethanol solvent, standing for 30 minutes, taking out, and naturally volatilizing ethanol until the thickness of the carbon nano tube film is 5 mu m;
then, carrying out etching treatment on the carbon nano tube film by adopting a laser machine, wherein an etching pattern is shown in fig. 2, the etching depth is completely penetrated, the aperture is 200 mu m, and the hole spacing is 500 mu m;
subsequently, sequentially and crosswise stacking an ultrasonic-treated aluminum foil matrix and a carbon nano tube film in a die, wherein the thickness of the aluminum foil matrix is 50 mu m;
finally, carrying out hot-pressing sintering treatment, wherein the hot-pressing temperature is 400 ℃, the pressure maintaining time is 1 hour, the pressure is 20MPa, the aluminum foil substrate 10 layers and the carbon nano tube film 10 layers are combined to form 20 layers;
finally, the carbon nano tube/aluminum composite material with the total thickness of 535 mu m is obtained, and the thermal conductivity of the carbon nano tube/aluminum composite material is 630W/mK.
Example 3
Firstly, soaking a carbon nano tube film in an ethanol solvent, standing for 30 minutes, taking out, and naturally volatilizing ethanol until the thickness of the carbon nano tube film is 100 mu m;
then, carrying out etching treatment on the carbon nano tube film by adopting a laser machine, wherein an etching pattern is shown in fig. 2, the etching depth is completely penetrated, the aperture is 100 mu m, and the center distance between two adjacent holes is 300 mu m;
subsequently, sequentially and crosswise stacking an ultrasonic-treated aluminum foil matrix and a carbon nano tube film in a die, wherein the thickness of the aluminum foil matrix is 5 mu m;
finally, carrying out hot-pressing sintering treatment, wherein the hot-pressing temperature is 600 ℃, the pressure maintaining time is 1 hour, the pressure is 20MPa, the aluminum foil substrate is 7 layers, the carbon nano tube film is 6 layers, and the total number of the layers is 13;
a carbon nanotube/aluminum composite material having a total thickness of 620 μm and a thermal conductivity of 620W/mK was obtained.
Example 4
Firstly, soaking a carbon nano tube film in an ethanol solvent, standing for 30 minutes, taking out, and naturally volatilizing ethanol until the thickness of the carbon nano tube film is 10 mu m;
then, carrying out etching treatment on the carbon nanotube film by adopting a laser machine, wherein the laser etching pattern is a triangular array, the triangles are equilateral triangles with side length of 100 mu m, and as shown in figure 3, the center distance between adjacent triangles is 300 mu m;
subsequently, sequentially and crosswise stacking an ultrasonic-treated aluminum foil matrix and a carbon nano tube film in a die, wherein the thickness of the aluminum foil matrix is 20 mu m;
finally, carrying out hot-pressing sintering treatment, wherein the hot-pressing temperature is 400 ℃, the pressure maintaining time is 1 hour, the pressure is 20MPa, the aluminum foil substrate is 7 layers, the carbon nano tube film is 6 layers, and the total number of the layers is 13;
a carbon nanotube/aluminum composite material having a total thickness of 180 μm and a thermal conductivity of 580W/mK was obtained.
Example 5
Firstly, soaking a carbon nano tube film in an ethanol solvent, standing for 30 minutes, taking out, and naturally volatilizing ethanol until the thickness of the carbon nano tube film is 10 mu m;
then, carrying out etching treatment on the carbon nanotube film by adopting a laser machine, wherein the etching depth is completely penetrated, the aperture is 100 mu m, the center distance between two adjacent holes is 300 mu m, the laser etching depth is 4 mu m, and both sides are etched once;
subsequently, sequentially and crosswise stacking an ultrasonic-treated aluminum foil matrix and a carbon nano tube film in a die, wherein the thickness of the aluminum foil matrix is 20 mu m;
finally, carrying out hot-pressing sintering treatment, wherein the hot-pressing temperature is 400 ℃, the pressure maintaining time is 1 hour, the pressure is 20MPa, the aluminum foil substrate is 7 layers, the carbon nano tube film is 6 layers, and the total number of the layers is 13;
a carbon nanotube/aluminum composite material having a total thickness of 180 μm and a thermal conductivity of 570W/mK was obtained.
In summary, the light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material and the preparation method thereof have the following advantages:
1. the surface of the carbon nano tube is not required to be doped by adopting a chemical method, so that the intrinsic structure of the carbon nano tube is not damaged.
2. In order to solve the problem of weak bonding strength of the carbon nanotube film/metal composite material interface, the invention adopts laser processing to carry out surface etching treatment on the carbon nanotube film before the carbon nanotube film is compounded with the aluminum foil, thereby enhancing the bonding strength of the interface, reducing the interface defects, ensuring the physical properties of the composite material and the like.
3. The preparation process has the advantages of simple method, common equipment, low cost and easy operation, and can effectively solve the problem of interface combination in the composite material, improve the interface combination condition and further improve the mechanical property, the electric conductivity, the heat conductivity and the like of the composite material.
The thermal conductivity of the carbon nanotube film/aluminum composite material prepared by the method is greatly improved, and an efficient and used preparation idea is provided for the preparation of the carbon nanotube film/metal composite material.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (3)

1. The preparation method of the light high-heat-conductivity layered interconnected carbon nano tube/aluminum composite material is characterized by comprising the following steps of:
s1, performing surface treatment on a carbon nano tube film by using a exertive organic solvent to obtain a surface densified carbon nano tube film;
s2, thinning the densified carbon nanotube film prepared in the step S1 to prepare a carbon nanotube film with thinned partial areas and integrally interconnected, wherein the partial areas are continuous or discontinuous patterns, accounting for 80% of the whole carbon nanotube film area, the thinning is performed by adopting laser cutting, electron beam cutting or solution etching, the cutting depth is 100 mu m, the aperture is 200 mu m, the center distance between two adjacent holes is 500 mu m, and the cutting shape is regular or irregular patterns distributed in an array or non-array;
s3, placing the aluminum foil in absolute ethyl alcohol for cleaning for 5min, and obtaining an aluminum foil matrix with a clean surface after the organic solvent volatilizes, wherein the thickness of the aluminum foil matrix is 50 mu m;
s4, stacking the carbon nanotube film prepared in the step S2 and the aluminum foil matrix prepared in the step S3 one by one, and preparing a carbon nanotube film/aluminum composite material preform with the layer number of 20 by adopting a hot-press sintering process;
s5, carrying out vacuum sintering on the carbon nanotube film/aluminum composite material preform prepared in the step S4 to obtain the carbon nanotube film/aluminum composite material, wherein a vacuum hot pressing mode is adopted in the vacuum sintering mode, and specifically comprises the following steps:
the applied pressure is 32MPa, the heating speed is 30 ℃/min, the sintering temperature is 600 ℃, the heat preservation time is 2h, the temperature is reduced to room temperature along with a furnace after the sintering is finished, the carbon nanotube film/aluminum composite material is obtained, and the vacuum sintering mode adopts an electric spark plasma sintering mode specifically as follows: the sintering pressure is 32MPa, the heating speed is 20 ℃/min, the sintering temperature is 450 ℃, the heat preservation is carried out for 2 hours, the temperature is reduced to room temperature along with a furnace after the sintering is finished, and the carbon nano tube film/aluminum composite material is obtained, the thickness of the carbon nano tube/aluminum composite material is 180 mu m, and the thermal conductivity is 630W/mK.
2. The method for preparing a light high-thermal-conductivity layered interconnected carbon nanotube/aluminum composite material according to claim 1, wherein in the step S1, the thickness of the surface densified carbon nanotube film is 5-100 μm.
3. The method for preparing the light high-thermal-conductivity layered interconnected carbon nanotube/aluminum composite material according to claim 1, wherein in the step S4, the etched surfaces of the carbon nanotube films face the same direction in the layer-by-layer stacking process.
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