A dispersion method for carbon nanotube-reinforced aluminum-based composite material

Abstract

The present invention discloses a method for dispersing carbon nanotube-reinforced aluminum-based composite materials. The method comprises the following steps: first, preparing flaky aluminum powder and heat-treating it; then, using ultrasonic dispersion to prepare uniformly dispersed carbon nanotubes; mixing the heat-treated aluminum powder with the uniformly dispersed carbon nanotubes to prepare a carbon nanotube / aluminum slurry; and finally, vacuum drying the slurry to obtain uniformly dispersed carbon nanotube / aluminum composite powder. The method ensures the integrity of the carbon nanotube structure, improves the dispersibility of the carbon nanotubes, and maintains the adsorption of the carbon nanotubes on the surface of the aluminum powder. The method is simple in process and can realize mass production, which has great engineering significance for the preparation of high-strength aluminum-based composite materials.

Description

Technical Field

[0001] The invention belongs to the technical field of preparing reinforced aluminum-based composite materials, and in particular relates to a dispersion method for carbon nanotube-reinforced aluminum-based composite materials. Background Art

[0002] With the advancement of materials science, carbon nanotubes (CNTs) are considered an ideal reinforcement material due to their unique mechanical and electrical properties. They are widely used in the preparation of high-performance metal-matrix composites. Aluminum-matrix composites, in particular, offer significant potential in aerospace, automotive, and electronic equipment due to their lightweight and high specific strength. However, achieving uniform dispersion of CNTs in aluminum-matrix composites remains a technical challenge.

[0003] Currently, high-energy ball milling is a commonly used dispersion method for preparing carbon nanotube-reinforced aluminum-based composites. This method uses mechanical force to hammer carbon nanotubes into the aluminum matrix, achieving dispersion within the aluminum matrix. While this method can improve the dispersibility of carbon nanotubes to a certain extent, it has some significant limitations. First, the intense mechanical action during high-energy ball milling can cause severe structural damage to the carbon nanotubes, which can degrade their original mechanical and electrical properties and increase reactivity during subsequent preparation. Furthermore, high-energy ball milling is costly and has low production efficiency, making it unsuitable for large-scale industrial production.

[0004] Therefore, the present invention proposes a low-cost and high-efficiency dispersion method for carbon nanotube-reinforced metal-based composite materials. While ensuring the structural integrity of the carbon nanotubes, the dispersion of carbon nanotubes in aluminum-based composite material powder is improved, which has great engineering significance for the preparation of high-strength aluminum-based composite materials. Summary of the Invention

[0005] The present invention provides a method for dispersing a carbon nanotube-reinforced aluminum-based composite material, which specifically comprises the following steps:

[0006] Step 1: preparing flaky aluminum powder; mixing aluminum powder, a process control agent, and grinding balls by high-energy ball milling to obtain flaky aluminum powder;

[0007] Step 2: Activating the surface of the aluminum powder; heat treating the flaky aluminum powder obtained in step 1;

[0008] Step 3: preparing a dispersed carbon nanotube solution; first, mixing a surfactant and a dispersion medium, performing electromagnetic stirring and heating treatment, then adding carbon nanotubes and the electromagnetically stirred solution, performing ultrasonic dispersion treatment, to obtain a uniformly dispersed carbon nanotube solution;

[0009] Step 4: preparing a carbon nanotube / aluminum slurry; first, adding the dispersion medium to the carbon nanotube solution prepared in step 3, then adding the flaky aluminum powder prepared in step 2 and mixing, filling the mixture into a can and vibrating the mixture to obtain a carbon nanotube / aluminum slurry;

[0010] Step 5: preparing uniformly dispersed carbon nanotube / aluminum powder; vacuum drying the carbon nanotube / aluminum slurry obtained in step 4 to obtain uniformly dispersed carbon nanotube / aluminum powder.

[0011] Specifically, the aluminum powder in step 1 is spherical aluminum powder with a particle size of 15 to 53 μm, and the process control agent is stearic acid.

[0012] Specifically, the high-energy ball milling in step 1 adopts a planetary ball mill, the ball milling device adopts a 500ml zirconia jar and 10mm zirconia grinding balls, the parameters of the high-energy ball milling are: a rotation speed of 200rpm, a high-energy ball milling mode of forward rotation for 10 minutes, standing for 10 minutes, reverse rotation for 10 minutes, standing for 10 minutes, and the high-energy ball milling time is 12 hours; after the high-energy ball milling is completed, it is cooled at room temperature for 8 hours, and the flaky aluminum powder is removed using argon-filled gloves.

[0013] Specifically, the heat treatment temperature in step 2 is 400° C., and the holding time is 2 h.

[0014] Specifically, the surfactant in step three is one of sodium dodecyl sulfate and sodium dodecylbenzenesulfonate, the dispersion medium is one of ethanol and isopropanol, and the carbon nanotubes have a diameter of 10-50 nm and a length of 0.5-30 μm.

[0015] Specifically, the rotation speed of the electromagnetic stirring process in step 3 is 200-500 rpm, the temperature is 40-50° C., and the time of the electromagnetic stirring is 30-50 min.

[0016] Specifically, during the ultrasonic dispersion treatment in step 3, the mass of the surfactant in the solution is 20% to 30% of the mass of the carbon nanotubes, the total mass of the prepared carbon nanotube solution is less than the mass of the flaky aluminum powder obtained in step 2, and the ultrasonic dispersion parameters are: power of 300 to 400 W, ultrasonic time of 0.5 to 2 h, and ultrasonic mode of ultrasonicating for 3 minutes, stopping for 1 minute, and repeating the cycle.

[0017] Specifically, the mass ratio of the total mass of the solution after adding the dispersion medium in step 4 to the mass ratio of the flaky aluminum powder is 0.8:1 to 1.2:1.

[0018] Specifically, the parameters of the vibration powder mixing in step 4 are a frequency of 50-60 Hz and a time of 1-2 hours. During the vibration powder mixing process, 10 mm large zirconia grinding balls and 5 mm small zirconia grinding balls are added to the powder mixing bottle, and their mass ratio is 5:1. The mass ratio of the total mass of the large zirconia grinding balls and the small zirconia grinding balls to the flaky aluminum powder is 1:1.

[0019] Specifically, during the vacuum drying process in step five, the carbon nanotube / aluminum paste is located in a graphite mold, and the vacuum drying parameters are: vacuum degree <5 Pa, temperature 80-120° C., holding time 6 h, and cooling time 6 h.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] (1) The present invention first grinds aluminum powder from spherical to flake form by high-energy ball milling, thereby increasing the surface area of ​​aluminum powder that can support carbon nanotubes, which can be used as an effective method for preparing high-content carbon nanotubes; the dispersion of carbon nanotubes during the ultrasonic process is improved by using alcohol dispersion medium, and the structure of carbon nanotubes is less affected.

[0022] (2) The present invention uses a low-energy mixing method of vibration mixing to protect the integrity of the carbon nanotube structure. The vibration mixing process improves the dispersion uniformity of the carbon nanotubes and maintains the adsorption of the carbon nanotubes on the surface of the aluminum sheet.

[0023] (3) The solid-liquid ratio and ball-to-material ratio of the vibration powder mixing proposed in the present invention are key parameters for achieving uniform coating of carbon nanotubes on the surface of aluminum powder. The process is simple, low-cost, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic flow chart of a dispersion method of a carbon nanotube-reinforced aluminum-based composite material provided by the present invention;

[0025] Figure 2 This is a SEM image of the powder morphology of the carbon nanotube / aluminum composite material prepared in Example 1 of the present invention;

[0026] Figure 3 This is a SEM image of the powder morphology of the carbon nanotube / aluminum composite material prepared in Comparative Example 1 of the present invention;

[0027] Figure 4 This is an SEM image of the powder morphology of the carbon nanotube / aluminum composite material prepared in Comparative Example 2 of the present invention;

[0028] Figure 5 The Raman spectral data comparison diagram of Example 1 of the present invention and Comparative Example 3 is shown. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal manner unless otherwise explicitly defined herein.

[0031] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] The present invention provides a dispersion method for carbon nanotube reinforced aluminum-based composite materials, which specifically includes:

[0033] Step 1: preparing flaky aluminum powder; mixing aluminum powder, a process control agent, and grinding balls by high-energy ball milling to obtain flaky aluminum powder;

[0034] Step 2: Activating the surface of the aluminum powder; heat treating the flaky aluminum powder obtained in step 1;

[0035] Step 3: preparing a dispersed carbon nanotube solution; first, mixing a surfactant and a dispersion medium, performing electromagnetic stirring and heating treatment, then adding carbon nanotubes and the electromagnetically stirred solution, performing ultrasonic dispersion treatment, to obtain a uniformly dispersed carbon nanotube solution;

[0036] Step 4: preparing a carbon nanotube / aluminum slurry; first, adding the dispersion medium to the carbon nanotube solution prepared in step 3, then adding the flaky aluminum powder prepared in step 2 and mixing, filling the mixture into a can and vibrating the mixture to obtain a carbon nanotube / aluminum slurry;

[0037] Step 5: preparing uniformly dispersed carbon nanotube / aluminum powder; vacuum drying the carbon nanotube / aluminum slurry obtained in step 4 to obtain uniformly dispersed carbon nanotube / aluminum powder.

[0038] In the present invention, the particle size of the aluminum powder in step one is spherical 15~53μm, the process control agent is stearic acid, and the specific process parameters of high-energy ball milling are: planetary ball milling, argon atmosphere protection, 500ml zirconia jar, 10mm zirconia grinding balls, ball-to-material ratio 5:1, speed 200rpm, forward rotation 10min, standing 10min, reverse 10min, standing 10min, and the cycle is carried out in sequence, and the cumulative ball milling time is 12h; after the high-energy ball milling is completed, the ball mill jar is cooled at room temperature for 8h and then the powder is taken out in an argon-filled glove box.

[0039] The heat treatment process in step 2 is to perform the heat treatment under vacuum or hydrogen / argon atmosphere, preferably hydrogen atmosphere, at 400°C for 2 hours. After cooling to room temperature, the powder is removed in an argon-filled glove box.

[0040] In step three, the surfactant is an anionic surfactant such as sodium dodecyl sulfate (SDS) and sodium dodecylbenzene sulfonate (SDBS), the dispersing medium is an alcohol medium such as ethanol and isopropanol, the carbon nanotubes have a diameter of 10~50nm and a length of 0.5~30μm, and are multi-walled carbon nanotubes. In the process of proportioning the carbon nanotubes and the solution after electromagnetic stirring, the mass of the surfactant is 20%~30% of the mass of the carbon nanotubes, for example, it can be 20%, 23%, 25%, 28%, and 30%. The total mass of the prepared carbon nanotube solution is less than the mass of the flaky aluminum powder prepared in step two; the electromagnetic stirring speed is 200~500rpm, the temperature is 40~50℃, and the time is 30~50min; the ultrasonic dispersion process is 300~400W, ultrasonic for 3min, stop for 1min, and repeat in sequence, and the total ultrasonic time is 0.5~2h.

[0041] The mass ratio of the total mass of the solution after adding the dispersion medium in step 4 to the mass ratio of the flaky aluminum powder is preferably 0.8:1~1.2:1, for example, it can be 0.8:1, 1.0:1, 1.2:1, the volume of the carbon nanotube / aluminum slurry in the powder mixing bottle is preferably 1 / 3~1 / 2, and the specific process parameters of the vibration powder mixing are: frequency 50~60Hz, time 1~2h; the mass ratio of 10mm zirconia large grinding balls and 5mm zirconia small grinding balls is 5:1, and the ratio of the grinding ball mass to the flaky aluminum powder mass is 1:1.

[0042] In the process of preparing uniformly dispersed carbon nanotube / aluminum powder in step 5, the carbon nanotube / aluminum slurry obtained in step 4 is first poured directly into a graphite mold and vacuum dried. The specific process parameters are: temperature 80~120℃, holding time 6h, and cooling time 6h.

[0043] The present invention will be further described below with reference to the embodiments. Example 1

[0044] A method for uniformly dispersing carbon nanotube-reinforced aluminum-based composite materials comprises the following steps:

[0045] Step 1: Add 120g of 30μm spherical aluminum powder and 1% stearic acid to a zirconia ball mill. Add 10mm zirconia grinding balls at a 5:1 ball-to-batch ratio. Purge the jar with argon and evacuate the jar two to three times. Place the jar in a planetary ball mill at 200rpm, rotating forward for 10 minutes, resting for 10 minutes, counter-rotating for 10 minutes, and resting for 10 minutes. Repeat this process until the total milling time reaches 12 hours. After standing at room temperature for 8 hours, remove the powder from the jar in an argon-filled glove box.

[0046] Step 2: The flaky aluminum powder obtained in step 1 was subjected to vacuum heat treatment at 400°C for 2 hours. After cooling to room temperature, the powder was collected in an argon-filled glove box.

[0047] Step 3: Add 0.25g of sodium lauryl sulfate to 50g of isopropyl alcohol. Place the beaker in an electromagnetic stirrer and heat and stir at 300rpm, 50°C, for 30 minutes. Immediately add 0.75g of carbon nanotubes to the solution and ultrasonically disperse it. Pour the solution into a jacketed beaker and perform a cooling cycle during the ultrasonic process. The ultrasonic process is performed at 300W, with a 3-minute on / off cycle, for a total of 1 hour.

[0048] Step 4: Add isopropyl alcohol to a carbon nanotube dispersion containing 0.75g of carbon nanotubes to bring the solution mass to 75g. Mix this with 75g of ball-milled pure aluminum powder and pour the mixture into a vibrating powder mixing bottle. Add a 5:1 ratio of large and small zirconia grinding balls to the bottle, for a 1:2 ratio of grinding balls to aluminum powder. Two vibrating powder mixing bottles of equal weight are placed symmetrically in a vibrating powder mixer. Vibration mixing is performed at a frequency of 60Hz for 1 hour.

[0049] Step 5: Pour the mixed slurry obtained in step 4 directly into a graphite mold, place it in a vacuum drying oven, heat it to 80°C, keep it warm for 6 hours, and cool it for 6 hours.

[0050] The final carbon nanotube / aluminum composite powder morphology is as follows Figure 2 As shown, the carbon nanotubes are evenly dispersed on the surface of the aluminum powder, without large-area exposure of the aluminum powder or agglomeration of the carbon nanotubes.

[0051] Comparative Example 1

[0052] This comparative example uses ultrasonic dispersion of aluminum powder and carbon nanotubes, a traditional ultrasonic dispersion process, to compare the beneficial effects of the present invention in achieving uniform dispersion of carbon nanotubes on aluminum powder. The process includes the following steps:

[0053] Step 1: Add 120g of 30μm spherical aluminum powder and 1% stearic acid to a zirconia ball mill. Add 10mm zirconia grinding balls at a 5:1 ball-to-batch ratio. Purge the jar with argon and evacuate the jar two to three times. Place the jar in a planetary ball mill at 200rpm, rotating forward for 10 minutes, resting for 10 minutes, counter-rotating for 10 minutes, and resting for 10 minutes. Repeat this process until the total milling time reaches 12 hours. After standing at room temperature for 8 hours, remove the powder from the jar in an argon-filled glove box.

[0054] Step 2: The flaky aluminum powder obtained in step 1 was subjected to vacuum heat treatment at 400°C for 2 hours. After cooling to room temperature, the powder was collected in an argon-filled glove box.

[0055] Step 3: Add 0.25g of sodium lauryl sulfate to 50g of isopropyl alcohol. Place the beaker in an electromagnetic stirrer and heat and stir at 300rpm, 50°C, for 30 minutes. Immediately add 0.75g of carbon nanotubes to the solution and ultrasonically disperse it. Pour the solution into a jacketed beaker and perform a cooling cycle during the ultrasonic process. The ultrasonic process is performed at 300W, with a 3-minute on / off cycle, for a total of 1 hour.

[0056] Step 4: Add 50g of isopropanol to the obtained carbon nanotube dispersion, mix it with 75g of aluminum powder in step 2, and continue to ultrasonicate the mixed solution. The ultrasonic process is 400W, ultrasonicating for 3 minutes and stopping for 1 minute, and the total ultrasonic time is 2 hours.

[0057] Step 5: After filtering the mixed solution obtained in step 4, place it in a vacuum drying oven, heat it to 80°C, keep it warm for 6 hours, and cool it for 6 hours.

[0058] The final carbon nanotube / aluminum composite powder morphology is as follows Figure 3 As shown in the figure, the carbon nanotubes are not evenly dispersed, with large agglomerates appearing. In addition, there are large exposed areas on the aluminum powder surface and many scratches caused by ultrasonic impact. Therefore, the carbon nanotubes cannot be effectively coated on the aluminum powder surface.

[0059] Comparative Example 2

[0060] This comparative example provides an example in which the solid-liquid ratio during the vibration mixing process is greater than the maximum parameter designed in the technical solution, including the following steps:

[0061] Step 1: Add 120g of 30μm spherical aluminum powder and 1% stearic acid to a zirconia ball mill. Add 10mm zirconia grinding balls at a 5:1 ball-to-batch ratio. Purge the jar with argon and evacuate the jar two to three times. Place the jar in a planetary ball mill at 200rpm, rotating forward for 10 minutes, resting for 10 minutes, counter-rotating for 10 minutes, and resting for 10 minutes. Repeat this process until the total milling time reaches 12 hours. After standing at room temperature for 8 hours, remove the powder from the jar in an argon-filled glove box.

[0062] Step 2: The flaky aluminum powder obtained in step 1 was subjected to vacuum heat treatment at 400°C for 2 hours. After cooling to room temperature, the powder was collected in an argon-filled glove box.

[0063] Step 3: Add 0.25g of sodium lauryl sulfate to 50g of isopropyl alcohol. Place the beaker in an electromagnetic stirrer and heat and stir at 300rpm, 50°C, for 30 minutes. Immediately add 0.75g of carbon nanotubes to the solution and ultrasonically disperse it. Pour the solution into a jacketed beaker and perform a cooling cycle during the ultrasonic process. The ultrasonic process is performed at 300W, with a 3-minute on / off cycle, for a total of 1 hour.

[0064] Step 4: Add isopropyl alcohol to a carbon nanotube dispersion containing 0.75g of carbon nanotubes to bring the solution mass to 150g. Mix this with 75g of ball-milled pure aluminum powder, achieving a solution-to-powder ratio of 2:1 (greater than the 1.2:1 ratio specified in the technical solution). Pour the mixture into a vibrating powder mixing bottle. Add a 5:1 ratio of large and small zirconia grinding balls to the bottle, achieving a 1:2 ball-to-aluminum powder ratio. Two vibrating powder mixing bottles of equal weight are placed symmetrically on a vibrating powder mixer. Vibration mixing is performed at a frequency of 60Hz for 1 hour.

[0065] Step 5: Pour the mixed slurry obtained in step 3 directly into a graphite mold, place it in a vacuum drying oven, heat it to 80°C, keep it warm for 6 hours, and cool it for 6 hours.

[0066] The final carbon nanotube / aluminum composite powder morphology is as follows Figure 4 As shown, compared with the carbon nanotube / aluminum composite powder morphology of Example 1, it can be clearly seen that there is a large area of ​​exposed area on the surface of the aluminum powder, the carbon nanotubes are severely agglomerated, and the dispersion is uneven, and the carbon nanotubes cannot be evenly and effectively coated on the aluminum powder surface. Therefore, the solid-liquid ratio designed in the technical solution is a decisive parameter in achieving the process of uniform dispersion of carbon nanotubes.

[0067] Comparative Example 3

[0068] This comparative example uses high-energy ball milling to disperse carbon nanotube / aluminum composite powder, which is currently the most commonly used dispersion method. However, this method severely damages the carbon nanotube structure. This is used to compare the beneficial effects of the present invention in protecting the carbon nanotube structure. The steps include:

[0069] 120g of 30μm spherical aluminum powder, 1% carbon nanotubes (CNTs) by mass, and 1% stearic acid were added to a zirconia ball mill. 10mm zirconia grinding balls were added at a 5:1 ball-to-batch ratio. The jar was then purged with argon and evacuated two to three times. The jar was then placed in a planetary ball mill at 200 rpm. A cycle of 10 minutes of forward rotation, 10 minutes of rest, 10 minutes of counter-rotation, and 10 minutes of rest was repeated until the total milling time reached 12 hours. After 8 hours of rest at room temperature, the powder was removed from the mill in an argon-filled glove box.

[0070] Comparison of Raman spectra of the final carbon nanotube / aluminum composite powder and the composite powder obtained in the embodiment Figure 5 As shown. In the Raman spectrum of carbon nanotubes, I D / I G Refers to the intensity ratio of the D band to the G band. The D band is located at approximately 1350 cm -1 It is related to the carbon atom lattice defects, while the G band is located at about 1580 cm -1 Nearby, it is related to the in-plane vibration of sp2 hybridized carbon atoms. D / I G It is usually used to characterize the degree of disorder in the carbon nanotube structure. The higher the ratio, the greater the defects and disorder in the material. Figure 5 I in D / I G It is calculated by calculating the D band (1000-1470cm -1 ) and near the G band (1470-1700cm -1 ) obtained by the peak area ratio. D / I G is 1.32, the composite powder I obtained in the embodiment of the present invention D / I G is 1.35, while the composite powder 1 obtained in Comparative Example 3 D / I G It can be concluded that the present invention has a beneficial effect on the structural protection of carbon nanotubes compared with the high-energy ball milling process.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for dispersing carbon nanotube-reinforced aluminum-based composite materials, characterized in that: The method comprises the following steps: Step 1: preparing flaky aluminum powder; mixing aluminum powder, a process control agent, and grinding balls by high-energy ball milling to obtain flaky aluminum powder; Step 2: Activating the surface of the aluminum powder; heat treating the flaky aluminum powder obtained in step 1; Step 3: preparing a dispersed carbon nanotube solution; first, mixing a surfactant and a dispersion medium, performing electromagnetic stirring and heating treatment, then adding carbon nanotubes and the electromagnetically stirred solution for ultrasonic dispersion treatment to obtain a uniformly dispersed carbon nanotube solution; during the ultrasonic dispersion treatment, the mass of the surfactant in the solution is 20% to 30% of the mass of the carbon nanotubes, and the total mass of the prepared carbon nanotube solution is less than the mass of the flaky aluminum powder obtained in step 2. The ultrasonic dispersion parameters are: power of 300 to 400 W, ultrasonic time of 0.5 to 2 hours, ultrasonic mode of ultrasonic for 3 minutes, stop for 1 minute, and repeat in sequence; Step 4: preparing a carbon nanotube / aluminum slurry; first, adding the dispersion medium to the carbon nanotube solution prepared in step 3, and then adding the flaky aluminum powder prepared in step 2 and mixing them; the mass ratio of the total mass of the solution after adding the dispersion medium to the flaky aluminum powder is 0.8:1 to 1.2:1; after filling the solution into a can, vibrating and mixing the solution to obtain a carbon nanotube / aluminum slurry; the vibration mixing parameters are a frequency of 50 to 60 Hz and a time of 1 to 2 hours; during the vibration mixing process, 10 mm large zirconia grinding balls and 5 mm small zirconia grinding balls are added to the mixing bottle in a mass ratio of 5:1, and the mass ratio of the total mass of the large zirconia grinding balls and the small zirconia grinding balls to the flaky aluminum powder is 1:1; Step 5: preparing uniformly dispersed carbon nanotube / aluminum powder; vacuum drying the carbon nanotube / aluminum slurry obtained in step 4 to obtain uniformly dispersed carbon nanotube / aluminum powder.

2. The method for dispersing a carbon nanotube-reinforced aluminum-based composite material according to claim 1, characterized in that: The aluminum powder in step 1 is spherical aluminum powder with a particle size of 15-53 μm, and the process control agent is stearic acid.

3. The method for dispersing a carbon nanotube-reinforced aluminum-based composite material according to claim 1, characterized in that: The high-energy ball milling in step 1 adopts a planetary ball mill, and the ball milling device adopts a 500ml zirconia jar and 10mm zirconia grinding balls. The parameters of the high-energy ball milling are: a rotation speed of 200rpm, a high-energy ball milling mode of forward rotation for 10min, standing for 10min, reverse rotation for 10min, standing for 10min, and the cycle is carried out in sequence. The high-energy ball milling time is 12h; after the high-energy ball milling is completed, it is cooled at room temperature for 8h, and the flaky aluminum powder is removed using argon-filled gloves.

4. The method for dispersing a carbon nanotube-reinforced aluminum-based composite material according to claim 1, characterized in that: The heat treatment temperature in step 2 is 400° C. and the holding time is 2 h.

5. The method for dispersing carbon nanotube-reinforced aluminum-based composite materials according to claim 1, characterized in that: In step 3, the surfactant is one of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate, the dispersion medium is one of ethanol and isopropanol, and the carbon nanotubes have a diameter of 10-50 nm and a length of 0.5-30 μm.

6. The method for dispersing carbon nanotube-reinforced aluminum-based composite materials according to claim 1, characterized in that: The electromagnetic stirring process in step 3 has a rotation speed of 200-500 rpm, a temperature of 40-50° C., and a time of 30-50 min.

7. The method for dispersing carbon nanotube-reinforced aluminum-based composite materials according to claim 1, characterized in that: During the vacuum drying process in step 5, the carbon nanotube / aluminum paste is located in a graphite mold, and the vacuum drying parameters are: vacuum degree <5 Pa, temperature 80-120° C., holding time 6 h, and cooling time 6 h.

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