Preparation method of graphene and silicon carbide mixed particle reinforced ultrathin copper-aluminum composite material

Abstract

The invention discloses a preparation method of a graphene and silicon carbide mixed particle reinforced ultrathin copper-aluminum composite material. The method comprises the following steps: mixing graphene and silicon carbide nanoparticles according to a mass ratio of 1: 2.5-1: 3, carrying out vacuum drying, and carrying out efficient dispersion by adopting a planetary ball milling process under the protection of argon; then, the T2 Cu and 1060 Al ultrathin plate is subjected to pretreatment such as annealing, surface grinding, electrolytic polishing and ultrasonic cleaning, and a regular micropore array is machined in the surface of the aluminum plate through a nanoindenter; and uniformly filling the micropores with the mixed particles through a scrubbing brush, carrying out rolling compounding at a reduction rate of 80% through a four-roller precision micro-rolling mill, and finally carrying out gradient heating at 300-500 DEG C for 30 minutes to prepare the ultrathin composite material with the thickness of 0.06 mm. The process effectively solves the problems of graphene agglomeration, weak interface bonding and the like, realizes efficient and uniform dispersion of the reinforced phase at the copper-aluminum interface, remarkably improves the conductivity, strength and plasticity of the material, and is suitable for the field of high-end electronic packaging and conductive connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite material preparation, and in particular to a preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material. BACKGROUND

[0002] With the continuous progress of science and technology, single material has been difficult to meet the demand of modern industry for the comprehensive performance of materials. Double metal composite material not only can meet the complex requirements of design, but also can make the comprehensive performance of composite material manifest, and is more and more concerned by countries all over the world. In the field of copper-aluminum composite material, although there are many previous studies, but the research on adding graphene and silicon carbide in the middle of ultra-thin copper-aluminum composite plate is still less, which limits the application field of ultra-thin copper-aluminum composite plate.

[0003] At present, graphene, as a flexible two-dimensional material with excellent physical and mechanical properties, is considered to be an ideal reinforcing body for metal matrix composites. Its thermal conductivity is as high as about 5000W / m·K, the elastic modulus is about 1100GPa, and the tensile strength is as high as about 125GPa. However, single graphene reinforcing body has some problems, such as agglomeration tendency, complex preparation process, difficulty in obtaining uniformly distributed high volume fraction graphene content powder, and inability to obtain firm graphene / aluminum powder combination. In addition, the traditional mechanical stirring dispersion process often leads to the formation of agglomerates in a short time, which further affects the performance of the composite material.

[0004] In order to solve the above problems, researchers began to explore the method of combining multiple reinforcing bodies. Among them, the method of mixing graphene with other nanomaterials for hybrid reinforcement has attracted widespread attention. However, the existing hybrid reinforcement method still has problems such as difficult to control interface reaction, damage to reinforcing phase and uneven distribution. Therefore, developing a new method to effectively mix graphene with silicon carbide and make it uniformly dispersed in the copper-aluminum composite interface has become the focus and difficulty of current research.

[0005] CN109078983A discloses a preparation method of ultra-thin copper-aluminum composite foil. The method obtains a 0.06mm thick copper-aluminum composite foil by rolling a 8mm thick copper-aluminum composite plate through multiple passes + intermediate annealing, and controls the rolling times, pressing amount, annealing temperature and annealing time and other parameters to improve the performance of copper-aluminum material and obtain a 0.06mm thick ultra-thin copper-aluminum composite foil. However, this method still needs to be further optimized in the rolling process to improve the performance and quality of the copper-aluminum composite foil.

[0006] CN116397141A proposes a kind of particle reinforced aluminum matrix composite material and its preparation method.The composite material uses 6063, A7075, A6061 or A2024 aluminum alloy powder and AlSi10Mg, AlSi7Mg, Al-12Si, A356 or A357 aluminum alloy powder as raw material, containing 0.01 ~ 1.0wt.% graphene oxide powder.The preparation method includes the steps of high-energy ball milling mixing double-metal powder, ultrasonic dispersion of graphene oxide powder, ultrasonic stirring + mechanical stirring mixing powder, vacuum drying of powder mixture and liquid-solid two-phase discharge plasma sintering.But, the invention still has optimization space in the selection of aluminum alloy powder and the type and proportion of reinforcing phase to further improve the performance of composite material.

[0007] The prior art has the following disadvantages: 1. There are more studies on copper-aluminum composite plates in the past, but there are fewer studies on adding graphene and silicon carbide in the middle of ultra-thin copper-aluminum composite plates, which limits the application field of ultra-thin copper-aluminum composite plates. 2. The existing graphene reinforcement has the problems of agglomeration tendency, complex preparation process, difficulty in obtaining uniformly distributed high-volume fraction graphene content powder, and inability to obtain firm graphene / aluminum powder combination. 3. Traditional mechanical stirring dispersion process often leads to the formation of agglomerates in a short time, which further affects the performance of the composite material. 4. The existing hybrid reinforcement method has the problems of difficult interface reaction control, damage to the reinforcing phase and uneven distribution. SUMMARY

[0008] There is insufficient research on adding graphene and silicon carbide in the middle of ultra-thin copper-aluminum composite plates in the prior art, and the graphene reinforcement has the problems of agglomeration tendency and complex preparation process. Therefore, to solve the above problems, the present application provides a preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material, which can significantly improve the strength, plasticity and electrical conductivity of ultra-thin copper-aluminum composite plate, and realize efficient and uniform dispersion of reinforcing phase at the copper-aluminum composite interface.

[0009] To achieve the above purpose, the present application adopts the following technical solutions: A preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material, comprising the following steps: 1. Prepare graphene sheets, silicon carbide particles, T2 Cu ultra-thin plate and 1060 Al ultra-thin plate; 2. Mix graphene and silicon carbide nanoparticles; 3. After mixing graphene and silicon carbide nanoparticles, place them in a vacuum drying oven for drying, then take them out, and ball mill them in a planetary ball mill under argon protection, using anhydrous ethanol and distilled water as grinding medium and process control agent, wherein the ball milling is carried out in a zirconia ball mill jar; 4. Take out the mixed powder for drying, thereby obtaining a graphene and silicon carbide composite material; 5. Anneal T2 Cu ultra-thin plate and 1060 Al ultra-thin plate using a vacuum cover annealing furnace; 6. Grind the T2 Cu ultra-thin plate and 1060 Al ultra-thin plate step by step using sandpaper to make the surface roughness Ra < 50 nm; then perform electrolytic polishing to eliminate residual stress; then sequentially ultrasonic clean the aluminum plate in acetone, ethanol, and deionized water for 10 min each, and dry the surface with nitrogen; under the conditions of inert gas (N2, humidity < 30% RH) and active vibration isolation (resonant frequency < 1 Hz, temperature control fluctuation ≤ 0.1 °C / h), use a nanoindenter to process a rectangular grid array on the surface of the aluminum plate: loading rate 6 mN / min, peak load 2 mN, holding time 10 s, hole diameter 150 nm, hole depth 1.5 μm, and hole center spacing 6 μm; immerse the graphene and silicon carbide mixed particles in a hard brush and reciprocally coat them on the surface of the aluminum plate in the vertical direction until all the holes are completely filled; perform rolling compounding by a four-roll precision micro-rolling mill, thereby obtaining a graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material; 7. Further heat the obtained graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material in a heating furnace.

[0010] Further, the mass ratio of graphene to silicon carbide in the graphene and silicon carbide nanoparticles is 1:2.5-1:3.

[0011] Further, the ball milling time is 9-10 h, the ball-to-material ratio is 35:1, the volume ratio of anhydrous ethanol to distilled water is 2.5:3, the total volume of anhydrous ethanol and distilled water accounts for 15% of the ball mill jar, and the rotation speed of the ball mill is 250-300 r / min.

[0012] Further, the reduction ratio of the four-roll precision micro-rolling mill for rolling compounding is 80%.

[0013] Further, the heating in the heating furnace is gradient heating at 300 °C→500 °C for 30 min.

[0014] Further, the diameter of the graphene sheet layer is 5-15 microns, the thickness is 3-10 nanometers, the particle size of the silicon carbide particles is 50-100 nanometers, the thickness of the T2 Cu ultra-thin plate and the 1060 Al ultra-thin plate is 0.1 mm, the width is 5 mm, the length is 5 mm, and the specification of the sandpaper is 240# to 4000#.

[0015] Further, the graphene and silicon carbide nanoparticles are mixed and placed in a 120°C vacuum drying box for drying for 60 minutes, the mixed powder is taken out for drying for 60 minutes at 150°C, and the annealing temperature of the vacuum cover annealing furnace is 410°C, and the holding time is 90 minutes. Advantages

[0016] Compared with the prior art, the present application provides a preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material, which has the following advantages: 1. By mixing graphene and silicon carbide nanoparticles, a synergistic effect is formed, which overcomes the shortcomings of previous research on ultra-thin copper-aluminum composite plates with graphene and silicon carbide in the middle.

[0017] 2. The graphene and silicon carbide mixed powder is uniformly dispersed, effectively solving the problem of easy agglomeration of graphene, ensuring the uniformity and stability of the composite material.

[0018] 3. Through vacuum drying and four-roll precision micro-rolling composite process, the graphene and silicon carbide are uniformly dispersed in the copper-aluminum composite interface, forming a three-dimensional conductive network, which significantly improves the conductivity and strength of the composite material.

[0019] 4. The nanoindentation technology is used to uniformly punch, so that the graphene and silicon carbide mixed particles after ball milling can be uniformly filled into the holes, further enhancing the conductivity and mechanical properties of the composite material.

[0020] 5. By adjusting the ratio of graphene and silicon carbide, and changing the rotation speed and time of ball milling, the optimal combination of graphene and silicon carbide is realized, maximizing the synergistic effect of each component.

[0021] 6. The specific annealing process and texturization treatment are selected to improve the plasticity and wettability of the composite material, effectively improving the processing performance of the material. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The nanoindentation schematic diagram of the optical electron mirror of Al in the present application; Figure 2 The present application Figure 1 The scanning electron microscope schematic diagram of a pit. DETAILED DESCRIPTION

[0023] The technical solutions in the present application will be described in detail below in combination with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Example 1

[0024] A method for preparing graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material, comprising the following steps: 1. Prepare graphene sheets with a diameter of 5-15 microns and a thickness of 3-10 nanometers.

[0025] 2. Prepare silicon carbide particles with a particle size of 50-100 nanometers.

[0026] 3. Prepare T2 Cu ultra-thin plates and 1060 Al ultra-thin plates with the same specifications, a thickness of 0.1 mm, a width of 5 mm, and a length of 5 mm.

[0027] 4. Mix graphene with silicon carbide nanoparticles, and the total amount of the mixed powder is 25 g, of which silicon carbide accounts for 62.5% of the total mass.

[0028] 5. After mixing the graphene and silicon carbide nanoparticles, dry them in a 120°C vacuum drying oven for 60 minutes, then ball mill them in a planetary ball mill under argon protection using anhydrous ethanol and distilled water as the grinding medium and process control agent. The ball milling is carried out in a zirconia ball mill jar, the ball milling time is 10 h, the ball-to-material ratio is 35:1, the volume ratio of anhydrous ethanol to distilled water is 2.5:3, the total volume of anhydrous ethanol and distilled water accounts for 15% of the ball mill jar, and the rotation speed of the ball mill is 300 r / min.

[0029] 6. Take out the mixed powder and dry it for 60 minutes at 150°C in a vacuum drying oven to obtain a graphene and silicon carbide composite material.

[0030] 7. Select T2 Cu ultra-thin plates and 1060 Al ultra-thin plates with the same specifications, a thickness of 0.1 mm, a width of 5 mm, and a length of 5 mm, and first anneal them in a vacuum cover-type annealing furnace at a temperature of 410°C for 90 minutes.

[0031] 8. Gradually polish the T2 Cu ultra-thin plates and 1060 Al ultra-thin plates using 240# to 4000# sandpaper to achieve a surface roughness Ra < 50 nm; then perform electrolytic polishing to eliminate residual stress; then sequentially place the aluminum plates in acetone, ethanol, and deionized water for ultrasonic cleaning for 10 minutes each, and dry the surfaces with nitrogen; under the conditions of inert gas (N2, humidity < 30% RH) and active vibration isolation (resonant frequency < 1 Hz, temperature control fluctuation ≤ 0.1 °C / h), such as Figure 1 and 2The nanoindenter is used to process the rectangular grid array on the surface of the aluminum plate: loading rate 6 mN / min, peak load 2 mN, holding 10 s, hole diameter 150 nm, hole depth 1.5 μm, hole center spacing 6 μm; before indentation, the positioning error is ensured to be less than 50 nm by a laser interferometer; after indentation, the hole depth is verified in situ by the AFM / SEM module integrated with the indenter, and then the hole depth uniformity (CV < 10%) is confirmed by 3D reconstruction of the white light interferometer; the graphene and silicon carbide mixed particles are infiltrated, and a hard brush is used to coat them on the surface of the aluminum plate in the vertical direction back and forth until all the holes are completely filled; the rolling composite is performed at a reduction of 80% by a four-roll precision micro-rolling mill, and a graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material is obtained.

[0032] 9. The graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material is heated in a heating furnace at 300℃→500℃ gradient for 30 minutes.

[0033] It is detected that the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment has an electrical conductivity of 54.2% IACS, a tensile strength of 650 MPa, and an elongation of 41.8%. Example 2

[0034] The preparation method of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: 8. The surface roughness Ra is less than 50 nm by gradually polishing with 240# to 4000# sandpaper; then electrolytic polishing is performed to eliminate residual stress; the aluminum plate is then sequentially ultrasonically cleaned in acetone, ethanol, and deionized water for 10 min, and the surface is dried with nitrogen; the graphene and silicon carbide mixed particles are infiltrated, and a hard brush is used to coat them on the surface of the aluminum plate in the vertical direction back and forth; the rolling composite is performed at a reduction of 80% by a four-roll precision micro-rolling mill, and a graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material is obtained.

[0035] In step 8, nanoindentation is not performed, and the others are the same as in example 1.

[0036] It is detected that the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment has an electrical conductivity of 54.2% IACS, a tensile strength of 650 MPa, and an elongation of 41.8%.

[0037] In comparative example 1, since the nanoindentation punching technology is not used, the dispersion uniformity of graphene and silicon carbide particles at the copper aluminum composite interface is slightly poor, and the bonding strength in some areas is different, resulting in a slight decrease in performance, which shows that the nanoindentation technology has a significant advantage in improving the performance of the composite plate. Example 3

[0038] The preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: 4 graphene: silicon carbide = 1:3, the same as example 2; 4. Mix graphene with silicon carbide nanoparticles, and the total amount of the mixed powder is 25g, wherein the silicon carbide accounts for 75% of the total mass.

[0039] It is detected that the conductivity of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment is 49.3% IACS, the tensile strength is 655MPa, and the elongation is 39.2%.

[0040] Due to the increase of the proportion of silicon carbide, the distribution density of silicon carbide in the composite plate increases, although the strength is improved to a certain extent, but too much silicon carbide may cause stress concentration in some areas, and at the same time, it may interfere with the electronic transmission path, so that the conductivity and elongation are reduced. This reflects the importance of the proportion of silicon carbide in balancing the performance.

[0041] Step 4 graphene: silicon carbide = 1:3, the same as example 2. Example 4

[0042] The preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: 5. The ball milling time is 9h, and the rotation speed of the ball mill is 250r / min.

[0043] It is detected that the conductivity of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment is 49.3% IACS, the tensile strength is 655MPa, and the elongation is 39.2%.

[0044] The adjustment of the ball milling time and the rotation speed of the ball mill affects the coating effect of graphene on silicon carbide. Compared with the ball milling parameters of example 2, the compactness of graphene coating in this embodiment is slightly insufficient, so that the combination of part of the silicon carbide particles with the copper aluminum matrix in the composite process is different, thereby causing a certain degree of performance decline, further verifying the key role of ball milling process parameter optimization in improving the performance of the composite plate.

[0045] Step 5 changes the ball milling time and the rotation speed of the ball mill, and the others are the same as example 2.

[0046] Comparative example 1 The preparation method of graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: 4. Mix graphene with silicon carbide nanoparticles, and the total amount of the mixed powder is 25g, wherein the silicon carbide accounts for 75% of the total mass.

[0047] The conductivity of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment is 36.2% IACS, the tensile strength is 510 MPa, and the elongation is 28.6%. Due to the high proportion of graphene, agglomeration phenomenon easily occurs in the mixed powder, which cannot effectively form a uniform three-dimensional conductive network, and there are many defects in the bonding at the copper aluminum composite interface, which leads to a substantial decline in performance, fully embodying the importance of proportion control of graphene and silicon carbide and the negative impact of agglomeration on performance.

[0048] In step 4, the proportion of graphene to silicon carbide is 1:1, and the other steps are the same as in example 2.

[0049] Comparative example 2 The method for preparing the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: 5. The ball milling time is 8h, and the rotation speed of the ball mill is 200r / min.

[0050] The conductivity of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment is 36.2% IACS, the tensile strength is 510 MPa, and the elongation is 28.6%. Due to the high proportion of graphene, agglomeration phenomenon easily occurs in the mixed powder, which cannot effectively form a uniform three-dimensional conductive network, and there are many defects in the bonding at the copper aluminum composite interface, which leads to a substantial decline in performance, fully embodying the importance of proportion control of graphene and silicon carbide and the negative impact of agglomeration on performance.

[0051] In step 5, the ball milling time and the rotation speed of the ball mill are changed, and the other steps are the same as in example 2. Comparative example 4 The method for preparing the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material comprises the following steps: No gradient heating, and the other steps are the same as in example 2. 9. The graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material obtained is heated in a heating furnace at 500°C for 30 minutes.

[0052] The conductivity of the graphene and silicon carbide mixed particle reinforced ultra-thin copper aluminum composite material prepared in this embodiment is 36.2% IACS, the tensile strength is 510 MPa, and the elongation is 28.6%. Due to the high proportion of graphene, agglomeration phenomenon easily occurs in the mixed powder, which cannot effectively form a uniform three-dimensional conductive network, and there are many defects in the bonding at the copper aluminum composite interface, which leads to a substantial decline in performance, fully embodying the importance of proportion control of graphene and silicon carbide and the negative impact of agglomeration on performance.

[0053] Through the comparative analysis of the above examples and comparative examples, the precise control of each process parameter has a decisive influence on the reinforcing effect of graphene and silicon carbide mixed particles in the ultra-thin copper-aluminum composite plate. The optimization of parameters such as ball milling time, rotation speed, reduction rate and gradient heating can ensure that the reinforcing phase forms a good three-dimensional conductive network and anchoring structure at the copper-aluminum composite interface, thereby effectively solving the technical problems of traditional ultra-thin copper-aluminum composite plates, such as the difficulty in balancing strength and conductivity, weak interface bonding strength, etc. At the same time, the application of nanoindentation punching technology further improves the dispersion uniformity and bonding strength of the reinforcing phase, providing key technical support for the overall improvement of the performance of ultra-thin copper-aluminum composite plates, and enabling them to have broad market prospects in high-end application fields that require high strength and high conductivity.

[0054] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for preparing graphene and silicon carbide hybrid particle reinforced ultrathin copper-aluminum composite material, characterized in that, It comprises the following steps: Step 1. Prepare graphene sheets, silicon carbide particles, T2 Cu ultra-thin plate and 1060 Al ultra-thin plate; Step 2. Mix graphene with silicon carbide nanoparticles; Step 3. After mixing graphene and silicon carbide nanoparticles, dry them in a vacuum drying box, and then take them out. Under the protection of argon, ball mill them in a planetary ball mill with anhydrous ethanol and distilled water as grinding media and process control agents. The ball milling is carried out in a zirconia ball milling tank; Step 4. Take out the mixed powder and dry it to obtain a graphene and silicon carbide composite material; Step 5. Anneal the T2 Cu ultra-thin plate and 1060 Al ultra-thin plate in a vacuum cover annealing furnace; Step 6. Grind the T2 Cu ultra-thin plate and 1060 Al ultra-thin plate step by step using sandpaper to make the surface roughness Ra < 50 nm; then perform electrolytic polishing to eliminate residual stress; then sequentially ultrasonic clean the aluminum plate in acetone, ethanol and deionized water, and dry the surface with nitrogen; under the conditions of inert gas (N2, humidity < 30% RH) and active vibration isolation (resonant frequency < 1 Hz, temperature control fluctuation ≤ 0.1 °C / h), use a nanoindenter to process a rectangular grid array on the surface of the aluminum plate: loading rate 6 mN / min, peak load 2 mN, holding time 10 s, hole diameter 150 nm, hole depth 1.5 μm, hole center spacing 6 μm; use a hard brush to immerse the graphene and silicon carbide mixed particles and coat them on the surface of the aluminum plate in the vertical direction back and forth until all the holes are completely filled; roll the composite through a four-roll precision micro-rolling mill to obtain a graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material; Step 7. Heat the graphene and silicon carbide mixed particle reinforced ultra-thin copper-aluminum composite material obtained in the heating furnace.

2. The method for preparing the graphene and silicon carbide mixed particle reinforced ultrathin copper-aluminum composite material according to claim 1, characterized in that, The mass ratio of graphene to silicon carbide in the graphene and silicon carbide nanoparticles is 1:2.5-1:

3.

3. The method of claim 1, wherein the graphene and silicon carbide hybrid particle-reinforced ultrathin copper-aluminum composite is prepared by the steps of: mixing graphene and silicon carbide particles in a solvent; and adding an aluminum powder to the mixture. The ball milling time is 9-10 h, the ball-to-material ratio is 35:1, the volume ratio of anhydrous ethanol to distilled water is 2.5:3, the total volume of anhydrous ethanol and distilled water accounts for 15% of the ball milling tank, and the speed of the ball mill is 250-300 r / min.

4. The method of claim 1, wherein the graphene and silicon carbide hybrid particle-reinforced ultra-thin copper-aluminum composite is prepared by the steps of: mixing graphene and silicon carbide particles in a solvent; and adding the mixed graphene and silicon carbide particles to an aluminum melt. The reduction rate of the four-roll precision micro-rolling mill for rolling the composite is 80%.

5. The method of claim 1, wherein the graphene and silicon carbide hybrid particle-reinforced ultrathin copper-aluminum composite is prepared by the steps of: mixing graphene and silicon carbide particles in a solvent; and adding an aluminum powder to the mixture. The heating in the heating furnace is 300°C→500°C gradient heating for 30 minutes.

6. The method of claim 1, wherein the graphene and silicon carbide hybrid particle-reinforced ultrathin copper-aluminum composite is prepared by the steps of: mixing graphene and silicon carbide particles in a solvent; and adding an aluminum powder to the mixture. The diameter of the graphene sheet layer is 5-15 microns, the thickness is 3-10 nanometers, the particle size of the silicon carbide particles is 50-100 nanometers, the thickness of the T2 Cu ultra-thin plate and the 1060 Al ultra-thin plate is 0.1 mm, the width is 5 mm, the length is 5 mm, and the specification of the sandpaper is 240# to 4000#.

7. The method of claim 1, wherein the graphene and silicon carbide hybrid particle-reinforced ultrathin copper-aluminum composite is prepared by the steps of: mixing graphene and silicon carbide particles in a solvent; and adding an aluminum powder to the mixture. The graphene and silicon carbide nanoparticles are dried in a 120°C vacuum drying box for 60 minutes, the drying time of the mixed powder is 150°C vacuum drying for 60 minutes, and the annealing temperature of the vacuum cover annealing furnace is 410°C for 90 minutes.

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