Copper oxide modified graphene reinforced magnesium-based composite material and preparation method thereof

Abstract

The application provides a copper oxide modified graphene reinforced magnesium-based composite material and a preparation method thereof. The composite material comprises 97-99.9 wt.% of a magnesium alloy and 0.1-3 wt.% of copper oxide modified graphene. The surface of the graphene is modified by copper oxide, and the price of the copper oxide is lower than that of noble metals such as nickel and silver, so that the material cost is effectively reduced. After the surface modification of the graphene, the self-aggregation of the graphene and the interface wettability between the graphene and the metal matrix can be effectively improved, a good interface combination is formed, and the mechanical properties of the composite material are improved.

Description

Technical Field

[0001] This invention relates to the field of metal matrix composite material preparation technology, and in particular to a copper oxide modified graphene reinforced magnesium matrix composite material and its preparation method. Background Technology

[0002] Magnesium and its alloys possess advantages such as low density, high specific strength, good machinability, and strong thermal conductivity, making them among the most promising materials. However, compared to aluminum and iron and their alloys, magnesium and its alloys have disadvantages such as low elastic modulus and poor mechanical properties, which severely restrict their further applications. Compared to pure magnesium and its alloys, magnesium-based composite materials have higher strength, better ductility, excellent thermal conductivity and hydrogen storage properties, and also possess the lightweight and vibration damping properties of magnesium and its alloys. They are a good structural and functional material and are currently one of the research hotspots in the field of materials science.

[0003] Graphene is a lightweight and high-strength two-dimensional monolithic material. In addition to its excellent optical, thermal and electrical conductivity, it also has the characteristics of low density, high elastic modulus and high tensile strength. As a good reinforcement, it has been used to prepare polymer composites, inorganic non-metallic composites and metal matrix composites. Current research results show that the addition of a small amount of graphene can greatly improve the strength and fracture toughness of the product, achieving the goal of high performance and lightweight.

[0004] Currently, two main problems exist in the research of graphene-reinforced magnesium matrix composites: ① Graphene has a strong tendency to self-aggregate, resulting in uneven dispersion in the magnesium alloy matrix; ② Poor wettability between graphene and the magnesium matrix leads to poor interfacial bonding strength. These factors severely affect the performance of graphene-reinforced magnesium matrix composites. To address these issues, researchers often employ high-energy ball milling in the composite material preparation process. While this method can improve the dispersion of graphene in the metal matrix and enhance the interfacial bonding strength, it severely damages the graphene structure, negatively impacting its reinforcing effect. Furthermore, the heat generated during ball milling easily leads to magnesium alloy oxidation, and the magnesium oxide content produced during this process is uncontrollable, its impact on the composite material's performance remaining unknown.

[0005] Patent CN108707773A discloses a method for preparing graphene-reinforced aluminum-based composite materials. This method involves first plating a copper or nickel layer on the surface of graphene, then ball milling it with metal powder, and finally mixing it with aluminum or an aluminum alloy to obtain the graphene-reinforced aluminum matrix composite material. This patent uses ball milling to obtain the mixed powder; however, the ball milling process severely damages the structure of graphene, making it difficult to achieve the reinforcing effect of graphene. Wet mixing, on the other hand, can achieve uniform mixing of graphene and metal powder using a dispersant.

[0006] Patent CN110331318A discloses a method for preparing graphene and carbon nanotube-reinforced aluminum-based composite materials. This method first involves copper and nickel plating of activated and sensitized graphene and carbon nanotubes. The copper- and nickel-plated graphene and carbon nanotubes are then mixed with magnesium powder, aluminum powder, and anhydrous ethanol to obtain a suspension. After ultrasonic dispersion and drying, a composite powder is obtained. This powder is then cold-pressed and sintered to obtain the graphene and carbon nanotube-reinforced aluminum-based composite material. This patent uses a vacuum hot-pressing sintering method to obtain the composite material, which has a long sintering time and causes continuous grain growth, making it impossible to obtain a composite material with fine grains and good mechanical properties. Summary of the Invention

[0007] The purpose of this invention is to provide a copper oxide-modified graphene-reinforced magnesium-based composite material and its preparation method, so as to improve the mechanical properties of the composite material such as hardness, tensile strength and yield strength.

[0008] To achieve the above objectives, the present invention provides a copper oxide-modified graphene-reinforced magnesium-based composite material, comprising 97-99.9 wt.% magnesium alloy and 0.1-3 wt.% copper oxide-modified graphene.

[0009] The copper oxide modified graphene-reinforced magnesium-based composite material of the present invention has a graphene sheet diameter of 1-15 μm, a thickness of 1-10 nm, and an impurity content of ≤1 wt.%; the mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:6 to 1:12.

[0010] To achieve the above objectives, the present invention also provides a method for preparing the copper oxide-modified graphene-reinforced magnesium-based composite material, comprising the following steps:

[0011] (1) Copper-plated graphene was prepared by depositing metallic copper on the surface of graphene using a chemical plating method.

[0012] (2) Copper-plated graphene was calcined to obtain copper oxide-modified graphene.

[0013] (3) Copper oxide modified graphene and magnesium powder were stirred and mixed with anhydrous ethanol and evaporated to dryness to prepare a uniformly mixed composite powder.

[0014] (4) Place the composite powder from step (3) into a mold and hot press it into shape;

[0015] (5) The blank obtained in step (4) is extruded to form a copper oxide modified graphene reinforced magnesium matrix composite material.

[0016] The preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention, wherein the copper plating solution used in step (1) has the following formula: 3-12 g / L CuSO4·5H2O, 15-30 g / L Na2EDTA, 10-25 g / L NaH2PO2·H2O, 0.2-0.5 g / L DMAB, 10-40 g / L Na2B4O7, and 1-4 g of graphene is treated per liter of copper plating solution.

[0017] The preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention includes step (1) copper plating process with pH 9-10, temperature 55-60℃, and stirring.

[0018] The preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention, wherein the temperature during the calcination process in step (2) is 200-500℃ and the time is 3-6h.

[0019] The preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention, wherein the magnesium powder in step (3) is pure magnesium, ZK series or AZ series magnesium alloy powder, with a particle size of 200-400 mesh and an impurity content of ≤0.5wt.%.

[0020] The preparation method of copper oxide modified graphene reinforced magnesium matrix composite material of the present invention, in step (3), the mixing process of copper oxide modified graphene, magnesium alloy powder and anhydrous ethanol is to continuously stir and mix at a temperature of 75 to 90°C until the anhydrous ethanol is evaporated, and the total amount of copper oxide modified graphene and magnesium alloy powder to the mass ratio of anhydrous ethanol is 1:50 to 1:100.

[0021] The preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention, wherein the hot pressing temperature in step (4) is 240-330℃, the pressure is 600-900MPa, and the holding time is 3-6min.

[0022] In the preparation method of copper oxide modified graphene reinforced magnesium-based composite material of the present invention, in step (5), the blank is first kept warm before extrusion molding at a temperature of 200-350℃ for 10-40 minutes.

[0023] The preparation method of copper oxide modified graphene reinforced magnesium matrix composite material of the present invention, wherein the extrusion molding temperature in step (5) is 200-350℃, the extrusion ratio is 10:1-30:1, and the extrusion speed is 1mm / s-8mm / s.

[0024] Beneficial effects of this invention:

[0025] This invention utilizes copper oxide to modify the surface of graphene, which is cheaper than precious metals such as nickel and silver, effectively reducing material costs. Surface modification of graphene effectively improves its self-aggregation and interfacial wettability with the metal matrix, forming a good interfacial bond and thus enhancing the mechanical properties of the composite material. In the preparation of the composite powder, this invention employs a wet mixing process, adding an appropriate amount of anhydrous ethanol to a mixture of copper oxide-modified graphene and magnesium alloy powder. Combined with ultrasonic treatment and mechanical stirring, this ensures that the copper oxide-modified graphene is uniformly dispersed in the magnesium alloy powder. Subsequent hot extrusion molding effectively refines the grains, resulting in a graphene-reinforced magnesium-based composite material with uniform structure, fine grains, and excellent performance. Compared with existing technologies, the preparation method of this invention is reliable, simple, controllable, environmentally friendly, and low-cost, while also being reproducible, and the obtained graphene-reinforced magnesium-based composite material exhibits excellent performance. Attached Figure Description

[0026] Figure 1 This is a scanning electron microscope image of copper oxide-modified graphene obtained in Example 3 of the present invention.

[0027] Figure 2 Energy dispersive spectroscopy (EDS) analysis of the copper oxide-modified graphene obtained in Example 3 of this invention.

[0028] Figure 3 This is an optical micrograph of the composite material prepared in Example 3 of the present invention.

[0029] Figure 4 This is a scanning electron microscope image of the composite material prepared in Example 3 of the present invention. Detailed Implementation

[0030] The present invention will now be described in detail through embodiments. It should be noted that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description.

[0031] Example 1

[0032] S1. First, the graphene (sheet diameter 1-5 μm, thickness 1-2 nm, impurity content ≤0.5 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution has the following formula: 3 g / L CuSO4·5H2O, 30 g / L Na2EDTA, 25 g / L NaH2PO2·H2O, 0.2 g / L DMAB, 40 g / L Na2B4O7·5H2O, where the amount of graphene is 1 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature at 55-60℃, and the mixture is stirred.

[0033] S2. First, place the copper-plated graphene obtained in step S1 into a muffle furnace for calcination to obtain copper oxide-modified graphene. The calcination process is carried out at a temperature of 200℃ for 6 hours. The mass ratio of copper oxide to graphene in the copper oxide-modified graphene is 1:6.

[0034] S3. First, add the copper oxide modified graphene obtained in step S2 to anhydrous ethanol and ultrasonically stir to disperse it evenly. Then, add ZK61 magnesium alloy powder (particle size 325-400 mesh, Zn: 5.73wt.%, Zr: 0.81wt.%, the remainder is Mg, impurity content ≤0.5wt.%). The total amount of copper oxide modified graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 75℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper oxide modified graphene is uniformly dispersed in magnesium alloy powder.

[0035] S4. Hot-press the mixed powder from step S3 into a shape, wherein the hot-pressing temperature is 240℃, the pressure is 900MPa, and the holding time is 3min.

[0036] S5. The pressed blank from step S4 is placed in a heating furnace for heat preservation at a temperature of 200℃ for 40 minutes. Then, it is extruded at a temperature of 200℃, an extrusion ratio of 10:1, and an extrusion speed of 1 mm / s to prepare a magnesium-based composite material with a copper oxide modified graphene content of 0.1%.

[0037] Example 2

[0038] S1. First, the graphene (sheet diameter 3-10 μm, thickness 1-5 nm, impurity content ≤1 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution has the following formula: 6 g / L CuSO4·5H2O, 25 g / L Na2EDTA, 20 g / L NaH2PO2·H2O, 0.3 g / L DMAB, and 20 g / L Na2B4O7·5H2O, wherein the amount of graphene is 2 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature is 55-60℃, and stirring is performed.

[0039] S2. First, place the copper-plated graphene obtained in step S1 into a muffle furnace for calcination to obtain copper oxide modified graphene. The calcination process is carried out at a temperature of 300℃ for 5 hours. The mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:8.

[0040] S3. First, add the copper oxide modified graphene obtained in step S2 to anhydrous ethanol and ultrasonically stir to disperse it evenly. Then, add AZ91 magnesium alloy powder (particle size 250-325 mesh, Al: 9.03wt.%, Zn: 1.05wt.%, the remainder is Mg, impurity content ≤0.1wt.%). The total amount of copper oxide modified graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 80℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper oxide modified graphene is uniformly dispersed in magnesium alloy powder.

[0041] S4. Hot-press the mixed powder from step S3 into a molding shape, wherein the hot-pressing temperature is 270℃, the pressure is 800MPa, and the holding time is 4min.

[0042] S5. The pressed blank from step S4 is placed in a heating furnace for heat preservation at a temperature of 250°C for 30 minutes. Then, it is extruded at a temperature of 250°C, an extrusion ratio of 15:1, and an extrusion speed of 4 mm / s to prepare a magnesium-based composite material with a copper oxide modified graphene content of 0.5%.

[0043] Example 3

[0044] S1. First, the graphene (sheet diameter 5-15 μm, thickness 3-8 nm, impurity content ≤0.5 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution has the following formula: 9 g / L CuSO4·5H2O, 20 g / L Na2EDTA, 15 g / L NaH2PO2·H2O, 0.4 g / L DMAB, and 30 g / L Na2B4O7·5H2O, wherein the amount of graphene is 3 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature is 55-60℃, and stirring is performed.

[0045] S2. First, place the copper-plated graphene obtained in step S1 into a muffle furnace for calcination to obtain copper oxide modified graphene. The calcination process is carried out at a temperature of 400℃ for 4 hours. The mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:10.

[0046] S3. First, add the copper oxide modified graphene obtained in step S2 to anhydrous ethanol and ultrasonically stir to disperse it evenly. Then, add AZ31 magnesium alloy powder (particle size 250-300 mesh, Al: 3.35wt.%, Zn: 1.27wt.%, the remainder is Mg, impurity content ≤0.1wt.%). The total amount of copper oxide modified graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 85℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper oxide modified graphene is uniformly dispersed in magnesium alloy powder.

[0047] S4. Hot-press the mixed powder from step S3 into a shape, wherein the hot-pressing temperature is 300℃, the pressure is 700MPa, and the holding time is 5min.

[0048] S5. The pressed blank from step S4 is placed in a heating furnace for heat preservation at a temperature of 300℃ for 20 minutes. Then, it is extruded at a temperature of 300℃, an extrusion ratio of 20:1, and an extrusion speed of 6 mm / s to prepare a magnesium-based composite material with a copper oxide modified graphene content of 1.5%.

[0049] Example 4

[0050] S1. First, the graphene (sheet diameter 5-10 μm, thickness 5-10 nm, impurity content ≤0.5 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution is formulated as follows: 12 g / L CuSO4·5H2O, 15 g / L Na2EDTA, 10 g / L NaH2PO2·H2O, 0.5 g / L DMAB, 10 g / L Na2B4O7·5H2O, wherein the amount of graphene is 4 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature is 55-60℃, and stirring is performed.

[0051] S2. First, place the copper-plated graphene obtained in step S1 into a muffle furnace for calcination to obtain copper oxide modified graphene. The calcination process is carried out at a temperature of 500℃ for 3 hours. The mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:12.

[0052] S3. First, add the copper oxide modified graphene prepared in step S2 to anhydrous ethanol and stir it evenly with ultrasonic stirring. Then, add pure magnesium powder (particle size 200-280 mesh, Mg content ≥99.5wt.%, impurity content ≤0.5wt.%). The total amount of copper oxide modified graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 90℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper oxide modified graphene is uniformly dispersed in pure magnesium powder.

[0053] S4. The mixture powder from step S3 is hot-pressed into shape, wherein the hot-pressing temperature is 330℃, the pressure is 600MPa, and the holding time is 6min.

[0054] S4. The pressed blank from step S4 is placed in a heating furnace for heat preservation at a temperature of 350°C for 10 minutes. Then, it is extruded at a temperature of 350°C, an extrusion ratio of 30:1, and an extrusion speed of 8 mm / s to prepare a magnesium-based composite material with a copper oxide modified graphene content of 3%.

[0055] Comparative Example 1

[0056] S1. Hot-press AZ31 magnesium alloy powder (particle size 250-300 mesh, Al: 3.35wt.%, Zn: 1.27wt.%, the remainder is Mg, impurity content ≤0.1wt.%), wherein the hot-pressing temperature is 300℃, the pressure is 700MPa, and the holding time is 5min;

[0057] S2. The pressed blank from step S1 is placed in a heating furnace for heat preservation at a temperature of 300℃ for 20 minutes. Then, it is extruded at a temperature of 300℃, an extrusion ratio of 20:1, and an extrusion speed of 6 mm / s to obtain magnesium alloy material.

[0058] Comparative Example 2

[0059] S1. First, the graphene (sheet diameter 5-15 μm, thickness 3-8 nm, impurity content ≤0.5 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution has the following formula: 9 g / L CuSO4·5H2O, 20 g / L Na2EDTA, 15 g / L NaH2PO2·H2O, 0.4 g / L DMAB, and 30 g / L Na2B4O7·5H2O, wherein the amount of graphene is 3 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature at 55-60℃, and the mixture is stirred to obtain copper-plated graphene. The mass ratio of total copper to graphene in the copper-plated graphene is 1:10.

[0060] S2. First, add the copper-plated graphene prepared in step S1 to anhydrous ethanol and stir it evenly with ultrasonic stirring. Then, add pure magnesium powder (particle size of 200-280 mesh, Mg content ≥99.5wt.%, impurity content ≤0.5wt.%). The total amount of copper-plated graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 85℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper-plated graphene is uniformly dispersed in pure magnesium powder.

[0061] S3. Hot-press the mixed powder from step S2 into a shape, wherein the hot-pressing temperature is 300℃, the pressure is 700MPa, and the holding time is 5min.

[0062] S4. The pressed blank from step S3 is placed in a heating furnace for heat preservation at a temperature of 300℃ for 20 minutes. Then, it is extruded at a temperature of 300℃, an extrusion ratio of 20:1, and an extrusion speed of 6 mm / s to prepare a magnesium-based composite material with a copper-plated graphene content of 1.5%.

[0063] Comparative Example 3

[0064] S1. First, the graphene (sheet diameter 5-15 μm, thickness 3-8 nm, impurity content ≤0.5 wt.%) is roughened by alkaline washing to remove surface impurities. Then, the graphene surface is sensitized and activated to have active sites. Next, copper is plated onto the graphene. The copper plating solution has the following formula: 9 g / L CuSO4·5H2O, 20 g / L Na2EDTA, 15 g / L NaH2PO2·H2O, 0.4 g / L DMAB, and 30 g / L Na2B4O7·5H2O, wherein the amount of graphene is 3 g / L. During the copper plating process, the pH is maintained at 9-10, the temperature is 55-60℃, and stirring is performed.

[0065] S2. First, place the copper-plated graphene obtained in step S1 into a muffle furnace for calcination to obtain copper oxide modified graphene. The calcination process is carried out at a temperature of 400℃ for 4 hours. The mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:10.

[0066] S3. First, add the copper oxide modified graphene obtained in step S2 to anhydrous ethanol and ultrasonically stir to disperse it evenly. Then, add AZ31 magnesium alloy powder (particle size 250-300 mesh, Al: 3.35wt.%, Zn: 1.27wt.%, the remainder is Mg, impurity content ≤0.1wt.%). The total amount of copper oxide modified graphene and magnesium alloy powder to anhydrous ethanol is 1:100. Stir continuously at 85℃ until the anhydrous ethanol is evaporated to dryness to obtain a mixed powder in which copper oxide modified graphene is uniformly dispersed in magnesium alloy powder.

[0067] S4. Pour the obtained mixed powder into a mold and cold press it under a pressure of 700 MPa. Then, use a vacuum hot pressing sintering method at a relative vacuum of 10. -2 ~10 -3 Under the conditions of heating at a rate of 60℃ / min, the temperature is increased to 280-400℃ and then sintered under pressure and temperature. The holding pressure is 10-30MPa. After sintering for 1-5 hours, heating is stopped and the furnace is cooled to room temperature to obtain a magnesium-based composite material with a copper oxide modified graphene content of 1.5%.

[0068] The performance parameters of the magnesium-based composite materials prepared in Examples 1-4 and the magnesium alloy materials prepared in Comparative Examples 1-3 are shown in Table 1:

[0069] Table 1

[0070] Comparative Examples Graphene content (wt.%) Hardness HV Tensile strength (MPa) Yield strength MPa elongation % Example 1 0.1 83.8 331.6 277.1 17.3 Example 2 0.5 79.1 328.1 275.8 16.0 Example 3 1.5 87.6 339.7 296.3 15.0 Example 4 3 49.6 273.2 258.7 17.8 Comparative Example 1 0 70.2 314.8 219.6 18.3 Comparative Example 2 1.5 43.8 241.7 230.4 19.2 Comparative Example 3 1.5 78.3 321.5 239.7 15.2

[0071] This invention improves the dispersibility and self-aggregation of graphene in the matrix by adding copper oxide to modify graphene and employing a wet mixing + powder metallurgy process, thus preparing a composite material with fine grains and ultimately improving the comprehensive mechanical properties of the alloy. Table 1 shows that the magnesium-based composite material prepared with a small amount of copper oxide-modified graphene exhibits significantly improved microhardness, tensile strength, and yield strength compared to the magnesium alloy material in Comparative Example 1 without copper oxide modification. The trend is that the microhardness, tensile strength, and yield strength of the composite material reach their maximum when the addition amount is 1.5%, which are 87.6 HV, 339.7 MPa, and 296.3 MPa, respectively, representing increases of 24.8%, 7.9%, and 34.9% compared to the magnesium matrix without graphene.

[0072] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A copper oxide decorated graphene reinforced magnesium based composite material, characterized in that, The magnesium alloy comprises 97-99.9 wt.% of magnesium and 0.1-3 wt.% of copper oxide modified graphene. The preparation method of the copper oxide modified graphene reinforced magnesium matrix composite material comprises the following steps: (1) depositing copper on the surface of graphene by electroless plating to prepare copper plated graphene; (2) roasting the copper plated graphene to obtain copper oxide modified graphene; (3) stirring and mixing the copper oxide modified graphene and magnesium powder with anhydrous ethanol as a medium and evaporating to dryness to prepare a uniformly mixed composite powder; (4) hot pressing the composite powder in the step (3) in a mold; (5) extruding the blank obtained in the step (4) to prepare the copper oxide modified graphene reinforced magnesium matrix composite material; The hot pressing temperature in the step (4) is 240-330 DEG C, the pressure is 600-900 MPa, and the pressure maintaining time is 3-6 min. The blank is first heat treated before the extrusion in the step (5), the temperature is 200-350 DEG C, and the heat treatment time is 10-40 min.

2. The copper oxide modified graphene reinforced magnesium matrix composite according to claim 1, wherein, The flake diameter of the graphene is 1-15 μm, the thickness is 1-10 nm, and the impurity content is ≤1 wt.%. The mass ratio of copper oxide to graphene in the copper oxide modified graphene is 1:6-1:

12.

3. The copper oxide modified graphene reinforced magnesium matrix composite according to claim 1, wherein, The plating solution used in the copper plating in the step (1) is composed of 3-12 g / L CuSO4·5H2O, 15-30 g / L Na2EDTA, 10-25 g / L NaH2PO2·H2O, 0.2-0.5 g / L DMAB, and 10-40 g / L Na2B4O7, and 1-4 g of graphene is treated per liter of the plating solution.

4. The copper oxide modified graphene reinforced magnesium matrix composite of claim 1, wherein, The pH in the copper plating process in the step (1) is 9-10, the temperature is 55-60 DEG C, and stirring is performed.

5. The copper oxide modified graphene reinforced magnesium matrix composite of claim 1, wherein, The temperature in the roasting process in the step (2) is 200-500 DEG C, and the time is 3-6 h.

6. The copper oxide modified graphene reinforced magnesium matrix composite of claim 1, wherein, The magnesium powder in the step (3) is pure magnesium, ZK or AZ magnesium alloy powder, the particle size is 200-400 mesh, and the impurity content is ≤0.5 wt.%.

7. The copper oxide modified graphene reinforced magnesium matrix composite of claim 1, wherein, The mixing process of the copper oxide modified graphene, magnesium alloy powder and anhydrous ethanol in the step (3) is continuously stirring and mixing at a temperature of 75-90 DEG C until the anhydrous ethanol is evaporated to dryness, and the mass ratio of the total amount of the copper oxide modified graphene and magnesium alloy powder to the anhydrous ethanol is 1:50-1:

100.

8. The copper oxide modified graphene reinforced magnesium matrix composite of claim 1, wherein, The extrusion temperature in the step (5) is 200-350 DEG C, the extrusion ratio is 10:1-30:1, and the extrusion speed is 1-8 mm / s.

Images