Silicon carbide-diamond particle aluminum-based composite powder and preparation method thereof

Abstract

The embodiment of the invention provides silicon carbide-diamond particle aluminum-based composite powder and a preparation method thereof.The preparation method comprises the steps that (X1) aluminum powder, silicon carbide particles and diamond particles with the preset volume fraction ratio are subjected to wet type ball milling under the protective atmosphere, and the composite powder is obtained, clockwise rotation ball milling and anticlockwise rotation ball milling are alternately carried out, and rotation is stopped during alternation; (X2) the composite powder obtained in the step (X1) is placed in a protective atmosphere to be subjected to ultrasonic dispersion, and dispersed composite powder is obtained; and (X3) the dispersed composite powder obtained in the step (X2) is placed in a vacuum environment to be dried, and the silicon carbide-diamond particle aluminum-based composite powder is obtained. According to the preparation method provided by the embodiment of the invention, the silicon carbide-diamond particle aluminum-based composite powder with low agglomeration, high activity, low oxygen content and uniform particle size can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of material preparation, and particularly to a silicon carbide-diamond particle aluminum matrix composite powder and a preparation method thereof. Background Art

[0002] With the increasingly diversified and complex development of aerospace and electronic devices, the requirements for material properties are becoming more and more stringent. Materials with high thermal conductivity, low expansion coefficient, and high strength play a crucial role in ensuring the reliability and service life of satellite structural components. At the same time, when high-power density electronic devices are operating, the average heat flux density exceeds 15 W / cm 2 , and the huge amount of heat cannot be effectively dissipated, resulting in an increasing failure rate, which has become a bottleneck restricting the further development of electronic devices. Therefore, other materials, such as silicon carbide, diamond, etc., are usually introduced into the aluminum matrix to form a composite material to enhance the performance, thereby meeting the requirements for the performance of the composite material in applications. However, it is difficult to obtain a composite material by directly mixing the materials

[0003] In summary, it is necessary to develop a precursor material that can prepare an aluminum matrix composite material with good physical properties and thermophysical properties. Summary of the Invention

[0004] Therefore, based on the problems of the prior art, the embodiments of the present invention provide a silicon carbide-diamond particle aluminum matrix composite powder and a preparation method thereof to prepare a silicon carbide-diamond particle aluminum matrix composite powder with low agglomeration, high activity, and low oxygen content.

[0005] The embodiments of the present invention provide a preparation method of a silicon carbide-diamond particle aluminum matrix composite powder, including the steps of:

[0006] (X1) Wet ball milling aluminum powder, silicon carbide particles, and diamond particles with a preset volume fraction ratio under a protective atmosphere to obtain a composite powder. The wet ball milling specifically includes alternately rotating the ball mill clockwise and counterclockwise and stopping when alternating;

[0007] (X2) Placing the composite powder obtained in step (X1) in a protective atmosphere for ultrasonic dispersion to obtain a dispersed composite powder;

[0008] (X3) Placing the dispersed composite powder obtained in step (X2) in a vacuum environment for drying treatment to obtain the silicon carbide-diamond particle aluminum matrix composite powder.

[0009] In some embodiments, the average particle size of the aluminum powder in the step (X1) is 25 μm to 30 μm; the average particle size of the silicon carbide particles is 250 μm to 300 μm; the average particle size of the diamond particles is 200 μm to 250 μm.

[0010] In some embodiments, the preset volume fraction ratio of the aluminum powder, the silicon carbide particles and the diamond particles is 11:5 to 7:2 to 4.

[0011] In some embodiments, in the step (X1), the duration of each clockwise rotation ball milling and each counterclockwise rotation ball milling is 3 min to 5 min respectively; the stopping time during the alternation is 1 min to 2 min, and the total time of the wet ball milling is 6 h.

[0012] In some embodiments, in the step (X1), the rotation speed of the wet ball milling is 100 rpm to 150 rpm.

[0013] In some embodiments, in the step (X1), the liquid medium of the wet ball milling is absolute ethanol.

[0014] In some embodiments, in the step (X3), the vacuum degree of the vacuum environment is -0.1 MPa, and during the drying process, every 30 min to 40 min, the vacuum degree of the vacuum environment is pumped to -0.1 MPa again.

[0015] In some embodiments, in the step (X3), the temperature of the drying process is 30 °C to 60 °C, and the drying time is 24 h to 72 h.

[0016] In some embodiments, in the step (X3), the initial temperature in the drying process is 30 °C to 40 °C, and the temperature is increased at a rate of 5 °C to 8 °C every 2 h to 4 h until the temperature reaches 50 °C to 60 °C, and then dried for 24 h to 48 h.

[0017] An embodiment of the present invention also provides a silicon carbide-diamond particle aluminum matrix composite powder, including the silicon carbide-diamond particle aluminum matrix composite powder prepared by using the preparation method of the silicon carbide-diamond particle aluminum matrix composite powder described in any one of the above.

[0018] The embodiments of the present invention have at least the following beneficial effects: By alternately performing clockwise ball milling and counterclockwise ball milling, and stopping during the alternation in a wet ball milling method, the grinding force of the composite powder is increased, and the average particle size of the composite powder is reduced; at the same time, by means of ultrasonic oscillation, the dispersibility of the composite powder is improved; and in steps X1 and X2, the operation is carried out under a protective atmosphere to reduce the oxidation problem of the composite powder and retain the high activity of the composite powder. Through the preparation method provided by the present invention, a silicon carbide-diamond particle aluminum-based composite powder with low agglomeration, high activity, low oxygen content, and uniform particle size can be obtained. Brief Description of the Drawings

[0019] Figure 1 It is a schematic flow chart of a preparation method of a silicon carbide-diamond particle aluminum-based composite powder provided by an embodiment of the present invention.

[0020] Figure 2 It is a front and back morphology diagram of aluminum powder, silicon carbide particles and diamond particles used in Example 1 before and after wet ball milling. Detailed Embodiments

[0021] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0022] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0024] It should also be noted that the division of multiple embodiments in the present invention is only for convenience of description and should not constitute a special limitation. The features in various embodiments can be combined with each other and cited from each other under the condition of no contradiction.

[0025] See Figure 1 , an embodiment of the present invention provides a method for preparing a silicon carbide-diamond particle aluminum matrix composite powder, including steps X1 to X3:

[0026] Step X1: Wet ball milling is carried out on aluminum powder, silicon carbide particles and diamond particles with a preset volume fraction ratio respectively under a protective atmosphere to obtain a composite powder. The wet ball milling specifically includes alternately rotating the ball mill clockwise and counterclockwise and stopping when alternating.

[0027] Step X2: The composite powder obtained in step X1 is placed in a protective atmosphere for ultrasonic dispersion to obtain a dispersed composite powder.

[0028] Step X3: The dispersed composite powder obtained in step X2 is placed in a vacuum environment for drying treatment to obtain a silicon carbide-diamond particle aluminum matrix composite powder.

[0029] The purities of the aluminum powder, silicon carbide particles and diamond particles used in step X1 are all greater than or equal to 99.95%. By alternately rotating the ball mill clockwise and counterclockwise in step X1, the average particle size of the obtained composite powder can be reduced, and the agglomeration of the composite powder can be reduced, and the dispersibility of the composite powder can be increased.

[0030] During the ball milling process, stopping when alternating is beneficial to reducing the probability of overheating, reducing the excessive wear of the composite powder, and improving the mixing effect. First, the friction between the ball milling medium and the composite powder will generate heat. Therefore, if the ball milling is continuously carried out, the temperature of the ball milling medium and the powder may rise, resulting in sintering of the powder or excessive particle deformation. Therefore, stopping when alternating between clockwise rotation and counterclockwise rotation of the ball mill helps to cool the ball milling medium, aluminum powder, silicon carbide particles and diamond particles, and reduce the probability of degradation of the composite powder material caused by overheating. Secondly, when stopping, the contact between the ball milling medium and the powder is reduced, which is beneficial to reducing the excessive wear of the composite powder and the refinement of the composite powder. If directly reversed, it may cause unnecessary wear of the composite powder, thereby affecting the particle size and distribution of the composite powder. Then, during the stopping process, the relative movement between the composite powder and the ball milling medium slows down, which helps the redistribution of the composite powder and promotes the full contact and uniform mixing between the particles of the composite powder.

[0031] Step X2, after wet ball milling in Step X1, the composite powder is mixed with the liquid medium added in the wet ball milling to form a liquid medium slurry, and the liquid medium slurry is ultrasonically dispersed to improve the dispersion of the composite powder in the liquid medium.

[0032] In Step X1 and Step X2, both the wet ball milling and the ultrasonic dispersion are carried out in a protective atmosphere to reduce the oxidation of the composite powder and retain the high activity of the composite powder.

[0033] Specifically, high-purity argon is used to form a protective atmosphere, which specifically includes evacuating the environment where the wet ball milling is located, and then filling it with high-purity argon until the pressure in the environment where the wet ball milling is located is the same as the external air pressure, and repeating the above operation at least twice; evacuating the environment where the ultrasonic dispersion is located, and then filling it with high-purity argon until the pressure in the environment where the ultrasonic dispersion is located is the same as the external air pressure, and repeating the above operation at least twice.

[0034] Step X3, drying is carried out in a vacuum environment to accelerate the evaporation rate of the liquid medium in the wet ball milling, thereby reducing the drying time and improving the drying efficiency; at the same time, it can also reduce the oxygen content in the environment, thereby reducing the probability of oxidation of the silicon carbide-diamond particle aluminum-based composite powder, which is beneficial to maintaining the activity of the silicon carbide-diamond particle aluminum-based composite powder.

[0035] In the embodiments of the present invention, by alternately performing clockwise ball milling and counterclockwise ball milling and stopping during the alternation in the wet ball milling method, the grinding force of the composite powder is increased and the average particle size of the composite powder is reduced; at the same time, by means of ultrasonic vibration, the dispersion of the composite powder is improved; and in Step X1 and Step X2, the operation is carried out in a protective atmosphere to reduce the oxidation problem of the composite powder and retain the high activity of the composite powder. Through the preparation method provided by the present invention, a silicon carbide-diamond particle aluminum-based composite powder with low agglomeration, high activity, low oxygen content and uniform particle size can be obtained, which helps to prepare a silicon carbide-diamond particle aluminum-based composite material from the silicon carbide-diamond particle aluminum-based composite powder.

[0036] In some specific embodiments, the average particle size of the aluminum powder in Step X1 is 25 μm to 30 μm; the average particle size of the silicon carbide particles is 250 μm to 300 μm; the average particle size of the diamond particles is 200 μm to 250 μm. In this way, the silicon carbide particles and the diamond particles can be evenly dispersed in the aluminum powder. If the particle sizes of the silicon carbide particles and the diamond particles are too large, it will cause insufficient crushing of the aluminum powder, silicon carbide particles and diamond particles during the ball milling process, and it is difficult to obtain finer aluminum powder. If the particle sizes of the silicon carbide particles and the diamond particles are too small, the oxygen introduced by the particles will also increase, and it is difficult to obtain a powder-state silicon carbide-diamond particle aluminum-based composite powder with a low oxygen content.

[0037] Specifically, in step X1, the morphology of the aluminum powder particles is spherical. Spherical aluminum powder particles have good fluidity and uniformity, which can promote the dispersibility during the mixing process; the morphology of the silicon carbide particles is irregular. Irregular silicon carbide particles have a larger contact area, which is beneficial to enhancing their interfacial bonding ability with the aluminum matrix, and the irregular silicon carbide particles are inexpensive, which is beneficial to reducing the cost of preparing the silicon carbide-diamond particle aluminum matrix composite powder; the morphology of the diamond particles is a near-spherical polyhedron, which helps to reduce the packing resistance between particles, improve the dispersibility of particles, and thus optimize the uniformity of the composite powder.

[0038] In some embodiments, in step X1, the preset volume fraction ratio of the aluminum powder, the silicon carbide particles and the diamond particles is 11:5-7:2-4. In this way, it is beneficial to the uniform dispersion of the particles and to obtain a silicon carbide-diamond particle aluminum matrix composite powder with low agglomeration.

[0039] In some specific embodiments, the duration of each clockwise rotation of the ball milling and each counterclockwise rotation of the ball milling in step X1 are 3 min to 5 min respectively; the time of stopping the rotation during the alternation is 1 min to 2 min, and the total time of wet ball milling is 6 h. The time of a single clockwise rotation of the ball milling or a single counterclockwise rotation of the ball milling does not exceed 5 min, which is beneficial to reducing the probability of phenomena such as agglomeration, coalescence and excessive cold welding of the composite powder, and reducing the influence on the crushing effect of the aluminum powder, the silicon carbide particles and the diamond particles; the time of a single clockwise rotation of the ball milling or a single counterclockwise rotation of the ball milling is greater than or equal to 2 min, so that the aluminum powder, the silicon carbide particles and the diamond particles can be sufficiently ball milled to obtain a composite powder with a smaller particle size.

[0040] The time of stopping the ball milling during the alternation is 1 min to 2 min, which helps to fully promote the mixing and distribution of the aluminum powder, the silicon carbide particles and the diamond particles, and is beneficial to effectively reducing the heat generated during the ball milling process; at the same time, it can also reduce the unnecessary refinement of the composite powder, reduce the probability of agglomeration, and reduce wear, and helps the ball milling to reach the required motion state again and maintain the ball milling efficiency. When the time of stopping the ball milling is less than one minute, it is difficult to fully promote the mixing and distribution of the aluminum powder, the silicon carbide particles and the diamond particles, resulting in poor uniformity of the composite powder, and at the same time, it may be difficult to effectively reduce the temperature during the ball milling process, and thus it is difficult to reduce the overheating problem. When the time of stopping the ball milling is higher than two minutes, it will cause the composite powder to be exposed to the static state for a long time, which may lead to unnecessary refinement of the composite powder, agglomeration or greater wear, and it may take a long time to reach the required motion state again during the re-rotation, thus reducing the efficiency.

[0041] In some embodiments, in step X1, the rotation speed of the ball mill is 100 rpm to 150 rpm, which is conducive to uniform dispersion of silicon carbide particles and diamond particles, low oxygen content, and small particle size of aluminum powder. If the rotation speed of the ball mill is too low, the particle size of the silicon carbide-diamond particle aluminum-based composite powder will increase and the activity will decrease; if the rotation speed of the ball mill is too high, the wear of the ball mill tank will be aggravated, the particle size of silicon carbide and diamond particles will decrease, and the C and O contents in the obtained silicon carbide-diamond particle aluminum-based composite powder will increase.

[0042] In some specific embodiments, the ball-to-material ratio of wet ball milling is 2 to 3:1. This helps to improve the wear effect of aluminum powder, silicon carbide particles and diamond particles during ball milling. A higher ball-to-material ratio can increase the number of collisions between the ball milling medium and the composite during the grinding process, promote the refinement and uniform distribution of the silicon carbide-diamond particle aluminum-based composite powder; at the same time, the maximum value of the ball-to-material ratio is limited to reduce the probability of excessive grinding making the particles too fine, thereby reducing the adverse effects on subsequent steps and the adverse effects on the performance of the silicon carbide-diamond particle aluminum-based composite material.

[0043] In some embodiments, in step X1, the liquid medium of wet ball milling is anhydrous ethanol. By using anhydrous ethanol, the composite powder can be further isolated from the external environment, and oxidation of the composite powder can be further prevented; ethanol is volatile and can take away part of the heat of the composite powder during the wet ball milling process; and when anhydrous ethanol is used, the drying of the composite powder can be facilitated.

[0044] In some embodiments, in step X2, the ultrasonic dispersion time is 1 h to 3 h to ensure that the slurry formed by the liquid medium of wet ball milling and the composite powder can be fully dispersed.

[0045] In some embodiments, in step X3, the temperature of the drying process is 30°C to 60°C, and the drying time is 24h to 72h. In this way, the drying process at a lower temperature and for a longer time can reduce the probability of cracking the surface of the silicon carbide-diamond particle aluminum-based composite powder due to excessive drying; at the same time, it can also improve the drying uniformity of the surface and interior of the silicon carbide-diamond particle aluminum-based composite powder.

[0046] In some embodiments, in step X3, the initial temperature in the drying process is 30°C to 40°C, and the temperature is increased at a rate of 5°C to 8°C every 2h to 4h until the temperature reaches 50°C to 60°C, and then dried for 24h to 48h. In this way, by gradually increasing the temperature during the drying process, the temperature distribution of the silicon carbide-diamond particle aluminum-based composite powder can be made more uniform, and the drying effect can be improved. Gradually increasing the temperature during the drying process is beneficial to reducing the sharp change in the surface and internal temperature of the silicon carbide-diamond particle aluminum-based composite powder, helping to reduce the accumulation of internal stress caused by uneven temperature during the drying process, and reducing the possibility of deformation or cracking of the silicon carbide-diamond particle aluminum-based composite powder; the gradient heating helps the moisture to be removed more evenly, avoiding the surface cracking of the silicon carbide-diamond particle aluminum-based composite powder caused by too rapid local moisture evaporation, and at the same time can also improve the drying uniformity of the surface and inside of the composite powder, thereby optimizing the drying effect of the silicon carbide-diamond particle aluminum-based composite powder.

[0047] In some embodiments, in step X3, the vacuum degree of the vacuum environment is -0.1 MPa, and during the drying process, every 30 min to 40 min, the vacuum degree of the vacuum environment is pumped to -0.1 MPa again. During the drying process, since water and the liquid medium of wet ball milling will volatilize, resulting in a decrease in the vacuum degree of the vacuum environment, which affects the drying speed and drying effect. Therefore, every 30 min to 40 min, pumping the vacuum degree of the vacuum environment to -0.1 MPa again helps to improve the drying speed and drying effect during the drying process.

[0048] In some specific embodiments, high-purity argon gas is filled into the ball milling tank to perform ball milling on aluminum powder, silicon carbide particles and diamond particles under a protective atmosphere; after the ball milling is completed, the ball milling tank is opened in a protective atmosphere glove box, and the mixture of the ball milled composite powder and anhydrous ethanol is separated from the ball milling beads through a sieve. The anhydrous ethanol slurry containing the composite powder is placed in a stainless steel tray and put into an ultrasonic cleaner in the glove box for ultrasonic dispersion. Subsequently, the dispersed slurry is transferred to a small high-temperature vacuum drying oven in the protective atmosphere glove box for drying. During drying, the vacuum degree of the glove box is pumped to -0.1 MPa, and then high-purity argon gas is introduced until it is equal to the outside world, and this process is repeated twice to ensure that the oxygen content in the glove box is maintained at a low level. During ultrasonic dispersion, the anhydrous ethanol slurry is placed in a stainless steel tray and placed on the rack of the ultrasonic cleaner to avoid splashing of impurity liquids into the tray and prevent contamination. The ultrasonic dispersion lasts for 1h to 3h to ensure that the slurry is fully dispersed. The composite powder is placed in a vacuum drying oven and evacuated to -0.1 MPa.

[0049] Hereinafter, the preparation method of the silicon carbide-diamond particle aluminum-based composite powder provided by the present invention will be described in detail in conjunction with Example 1.

[0050] Example 1

[0051] A) Take raw materials with a purity of over 99.95%: 75.2 g of aluminum powder, 57.1 g of silicon carbide particles, and 17.7 g of diamond particles. The average particle size of the aluminum powder is 25 μm, and the average particle sizes of the silicon carbide particles and diamond particles are 300 μm and 200 μm respectively. The volume ratio of the aluminum powder, silicon carbide particles, and diamond particles is 11:7:3. Put the prepared raw materials into an alumina ball mill tank, add 300 g of alumina ball mill beads, and use absolute ethanol as the liquid medium for wet ball milling. The addition amount of absolute ethanol is 1 / 2 of the volume of the ball mill tank. Use an alumina ball mill tank with a capacity of 1 L. After loading the raw material powder and absolute ethanol, seal it with a sealing bolt. After sealing, close the intake valve on the upper cover of the ball mill tank, open the exhaust valve, and use a small vacuum pump to evacuate the tank to a vacuum, with a vacuum degree of -0.1 MPa. Then close the exhaust valve, connect the argon gas pipeline to the intake valve and open it, and fill the tank with high-purity argon until the internal and external air pressures are balanced. Next, open the exhaust valve and keep the argon gas discharging from the exhaust valve for 5 min. Repeat the steps after sealing the ball mill tank twice. Then close the intake valve and exhaust valve of the ball mill tank, and install the ball mill tank on a QXQM-16 all-round planetary ball mill. Set the ball milling speed to 100 rpm, and the total running time of the equipment is 6 h. Stop rotating for 1 min every 5 min of operation, and switch the rotation direction each time the ball mill stops rotating; for example, switch the ball mill from clockwise rotation to counterclockwise rotation, continue to run for 5 min after switching, then stop for 1 min, and then switch the ball mill from counterclockwise operation to clockwise rotation after stopping.

[0052] See Figure 2 , where Figure 2 (a) is the original morphology diagram of the aluminum powder; Figure 2 (b) is the original morphology diagram of the silicon carbide particles; Figure 2 (c) is the original morphology diagram of the diamond particles; Figure 2 (d) is the morphology diagram of the silicon carbide particles and aluminum powder after wet ball milling; Figure 2 (e) is the morphology diagram of the diamond particles and aluminum after wet ball milling.

[0053] From Figure 2 it can be seen that after ball milling by the method of Example 1, the silicon carbide particles and diamond particles have a crushing effect on the aluminum powder, significantly reducing the particle size of the aluminum powder. Since the hardness of silicon carbide is lower than that of diamond, the hardness of the silicon carbide particles is less than that of the diamond particles, and the range of particle size change is also greater than that of the diamond particles.

[0054] B) After the ball milling is completed, evacuate the glove box to a vacuum of -0.1 MPa, and then introduce high-purity argon until it is equal to the external air pressure. This process is repeated twice to ensure that the oxygen content in the glove box is maintained at a low level. Open the ball milling tank in the glove box with a high-purity argon atmosphere, and separate the anhydrous ethanol slurry from the ball milling beads through a sieve. Place the separated anhydrous ethanol slurry on a stainless steel tray and put it into the ultrasonic cleaner in the glove box for 4 hours of ultrasonic oscillation dispersion.

[0055] C) Put the dispersed slurry into a small high-temperature vacuum drying oven in the glove box, evacuate the vacuum to -0.1 MPa, and set the heating temperature to 50 °C. Restart the mechanical pump every 1 hour to restore the vacuum to -0.1 MPa for 6 hours. When the vacuum no longer drops, introduce high-purity argon into the drying oven, balance it to atmospheric pressure, turn off the heating function, take out the powder and put it into a vacuum bag, and silicon carbide-diamond particle aluminum-based composite powder without agglomeration and with uniform particle size can be obtained.

[0056] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A method for preparing a silicon carbide-diamond particle aluminum matrix composite powder, characterized in that, Comprising the steps of: (X1) Wet ball milling aluminum powder, silicon carbide particles and diamond particles with preset volume fraction ratios respectively under a protective atmosphere to obtain a composite powder. The wet ball milling specifically includes alternately performing clockwise rotation ball milling and counterclockwise rotation ball milling, and stopping rotation during the alternation; (X2) Placing the composite powder obtained in the step (X1) in a protective atmosphere for ultrasonic dispersion to obtain a dispersed composite powder; (X3) Placing the dispersed composite powder obtained in the step (X2) in a vacuum environment for drying treatment to obtain the silicon carbide - diamond particle aluminum matrix composite powder.

2. The preparation method according to claim 1, characterized in that, In the step (X1), the average particle size of the aluminum powder is 25μm - 30μm; the average particle size of the silicon carbide particles is 250μm - 300μm; the average particle size of the diamond particles is 200μm - 250μm.

3. The preparation method according to claim 1, wherein, The preset volume fraction ratio of the aluminum powder, the silicon carbide particles and the diamond particles is 11:5 - 7:2 - 4.

4. The preparation method according to claim 1, characterized in that, In the step (X1), the duration of each clockwise rotation ball milling and each counterclockwise rotation ball milling is 3min - 5min respectively; the stopping rotation time during the alternation is 1min - 2min, and the total time of the wet ball milling is 6h.

5. The preparation method according to claim 1, characterized in that, In the step (X1), the rotation speed of the wet ball milling is 100rpm - 150rpm.

6. The preparation method according to claim 1, wherein In the step (X1), the liquid medium of the wet ball milling is anhydrous ethanol.

7. The preparation method according to claim 1, characterized in that, In the step (X3), the vacuum degree of the vacuum environment is -0.1MPa, and during the drying treatment process, every 30min - 40min, the vacuum degree of the vacuum environment is pumped to -0.1MPa again.

8. The preparation method according to claim 1, characterized in that, In the step (X3), the temperature of the drying treatment is 30℃ - 60℃, and the drying treatment time is 24h - 72h.

9. The preparation method according to claim 5, characterized in that, In the step (X3), the initial temperature in the drying treatment is 30℃ - 40℃, and the temperature is increased at a rate of 5℃ - 8℃ every 2h - 4h until the temperature reaches 50℃ - 60℃, and then dried for 24h - 48h.

10. A silicon carbide-diamond particle aluminum-based composite powder, characterized in that, Comprising the silicon carbide - diamond particle aluminum matrix composite powder prepared by using the preparation method of the silicon carbide - diamond particle aluminum matrix composite powder according to any one of claims 1 - 9.

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