Preparation method of fiber-reinforced aluminum-magnesium laminated composite material

Abstract

The invention relates to a preparation method of a fiber-reinforced aluminum-magnesium laminated composite material, which comprises the following steps of: 1) stacking 5-20 groups of aluminum plate-two-dimensional woven carbon fiber cloth-magnesium plate-two-dimensional woven carbon fiber cloth as one group, placing another aluminum plate as the outermost layer after the last group is stacked, and placing in a hot-pressing mold; (2) placing in a vacuum hot pressing furnace, vacuumizing, and introducing inert gas; and 3) applying pressure to the material in the hot-pressing mold, heating to an aluminum-magnesium bonding temperature, keeping the temperature and the pressure constant for a period of time, stopping heating, naturally cooling to room temperature, relieving the pressure applied to the material in the hot-pressing mold, opening the vacuum hot-pressing furnace door, and taking out the material in the hot-pressing mold, thereby obtaining the fiber-reinforced aluminum-magnesium laminated composite material. According to the fiber-reinforced aluminum-magnesium laminated composite material prepared through the method, the specific strength of the aluminum-magnesium laminated composite material can be improved, lamination interfaces are well combined, and the geometrical morphology of carbon fibers is complete.

Description

Technical Field

[0001] The present invention belongs to the field of preparation methods of aluminum-magnesium laminated composites, and particularly relates to a preparation method of fiber-reinforced aluminum-magnesium laminated composites. Background Art

[0002] With the development of weapon science and technology, the performance requirements for armor materials are gradually increasing. Laminated composites are considered the main development direction of future lightweight and high-strength armor. Laminated composites can significantly reduce the weight of the material itself while meeting the protection effect, meeting the demand for equipment lightweight. Magnesium alloys have the characteristics of low density, good damping and earthquake resistance, high recycling rate, and good electromagnetic shielding performance. At present, magnesium alloys have received extensive attention in the fields of electronics, transportation, aerospace, etc. However, magnesium alloys have disadvantages such as flammability and easy corrosion, and the problem of insufficient production capacity also restricts the further development of magnesium alloys.

[0003] At present, there has been a way to combine aluminum alloy and magnesium alloy to prepare laminated composites to solve these problems. However, for the laminated composites prepared simply by using aluminum alloy and magnesium alloy, their performance has not been greatly improved in terms of specific strength compared with single materials. Further, research shows that adding a reinforcing phase can further improve the specific strength of the laminated material, but at present, the combination of the reinforcing phase and the matrix magnesium-aluminum material is not dense, and the performance improvement is limited. Therefore, there is an urgent need to develop a material design and preparation method that can further improve the specific strength of the laminated material.

[0004] Carbon fiber materials have a low density and excellent characteristics such as high temperature resistance, heat conduction, and corrosion resistance. They have high specific strength and specific modulus along the fiber axis direction and are currently widely used in the preparation of lightweight and high-strength composites. As a reinforcing phase, carbon fiber can significantly improve the strength-to-mass ratio of the material. Therefore, if carbon fiber materials can be combined with aluminum / magnesium laminated materials, the advantages of both materials can be utilized simultaneously to improve the performance of the laminated composites. Specific weaving methods and nickel plating treatment of carbon fibers can further improve the interlayer bonding ability of the material. Summary of the Invention

[0005] Object of the Invention

[0006] To solve the problems of low specific strength and non-dense combination at the reinforcing phase in the existing aluminum / magnesium laminated composites, the present invention provides a preparation method of fiber-reinforced aluminum-magnesium laminated composites using aluminum plates and magnesium plates as raw materials and adding carbon fiber reinforcing phases.

[0007] Technical Solution

[0008] A fiber-reinforced aluminum-magnesium laminated composite material. The fiber-reinforced aluminum-magnesium laminated composite material is composed of aluminum plates, magnesium plates and carbon fiber cloth in a two-dimensional weaving pattern. Nickel plating layers are uniformly attached to the upper and lower surfaces of the carbon fiber cloth in the two-dimensional weaving pattern, and the thickness of the nickel plating layer is 20-80μm. The fiber-reinforced aluminum-magnesium laminated composite material takes aluminum plate-carbon fiber cloth in two-dimensional weaving pattern-magnesium plate-carbon fiber cloth in two-dimensional weaving pattern as a group, stacks 5-20 groups, and stacks an aluminum plate on the carbon fiber cloth in the two-dimensional weaving pattern of the last group of stacks as the outermost layer. Further, the carbon fiber material of the carbon fiber cloth in the two-dimensional weaving pattern is PAN-based carbon fiber. Each bundle of carbon fibers is composed of multiple single-filament carbon fibers. The diameter of the single-filament carbon fiber is 0.005-0.008mm. The two-dimensional weaving pattern is woven in a plain weave, twill weave or satin weave manner. A bundle of carbon fibers is composed of 3000-12000 single-filament carbon fibers, and there is a 1-2mm interval between adjacent bundles of carbon fibers.

[0009] Further, the aluminum plate model is one of 2-series aluminum alloy to 7-series aluminum alloy, and the thickness is 0.1-0.5mm; the magnesium plate model is 1-series magnesium alloy or 2-series magnesium alloy, and the thickness is 0.1-0.5mm.

[0010] A preparation method of the fiber-reinforced aluminum-magnesium laminated composite material as described above, the steps are as follows:

[0011] 1) Cut the aluminum plates, magnesium plates and carbon fiber cloth in a two-dimensional weaving pattern into the shape and size required by the hot pressing mold, stack them staggeredly, take aluminum plate-carbon fiber cloth in two-dimensional weaving pattern-magnesium plate-carbon fiber cloth in two-dimensional weaving pattern as a group, stack 5-20 groups, and place another aluminum plate as the outermost layer after the last group of stacks, and place it in the hot pressing mold;

[0012] 2) Place the hot pressing mold in a vacuum hot pressing furnace, evacuate the vacuum hot pressing furnace, and then introduce an inert gas;

[0013] 3) Apply pressure to the materials in the hot pressing mold, heat to the aluminum-magnesium bonding temperature, keep the temperature and pressure constant for a period of time, stop heating and naturally cool to room temperature, release the pressure applied to the materials in the hot pressing mold, open the door of the vacuum hot pressing furnace and take out the materials in the hot pressing mold, and the fiber-reinforced aluminum-magnesium laminated composite material can be obtained.

[0014] Further, the vacuum degree after evacuating the vacuum hot pressing furnace is (1-2) -3 MPa, the temperature of the introduced inert gas is 100-200°C, the air pressure in the vacuum hot pressing furnace after introducing the inert gas is (1-2) -1 MPa, the pressure applied to the materials in the hot pressing mold is 10-15MPa, the maintained aluminum-magnesium bonding temperature is 420-450°C, and the heat preservation time is 4-8h.

[0015] Furthermore, the carbon fiber cloth with the two-dimensional weaving method needs to be pretreated by degumming, electroplating, cleaning and drying, and the aluminum plate and magnesium plate need to be pretreated by grinding.

[0016] Furthermore, the specific method steps of the pretreatment of the carbon fiber cloth with the two-dimensional weaving method are as follows:

[0017] 1) Degumming: The carbon fiber cloth with the two-dimensional weaving method is placed in a vacuum heat treatment furnace and kept at 400-500 °C for 0.5-1 h, and the surface is degummed by high-temperature burning.

[0018] 2) Electroplating: The degummed carbon fiber cloth with the two-dimensional weaving method is laid flat in an electroplating device for surface nickel plating. The current density used for nickel plating is 0.4-0.6 A / dm 2 , and the electroplating time is controlled to be 3-8 min;

[0019] 3) Cleaning and drying: The nickel-plated carbon fiber cloth with the two-dimensional weaving method is cleaned and then placed in a vacuum drying oven and dried at 60-80 °C for 6-12 h;

[0020] The specific method steps of the pretreatment of the aluminum plate and magnesium plate are as follows: Sandpaper with 800-1500# is used for grinding to remove the surface oxide.

[0021] Furthermore, the overall hot pressing die is circular ring-shaped, there is a protruding ring in the middle of the inner side of the circular ring, and a plurality of air holes are evenly opened on the periphery of the hot pressing die. The air holes communicate the outside of the hot pressing die and the inner side of the protruding ring. The material to be hot pressed is located inside the protruding ring. Pressing plates are provided on the upper and lower sides of the material to be hot pressed. The pressing plates are in contact with the hot pressing heads at the ends of the hot pressing rods. The furnace body of the vacuum hot pressing furnace passes through and is fixed with a protective gas spray gun. A valve is provided outside the furnace body of the protective gas spray gun. The protective gas spray guns are symmetrically arranged in 2 or 4 pieces, and each protective gas spray gun is directed at one of the air holes.

[0022] Furthermore, the inert gas introduced in step 3) is introduced through the protective gas spray gun. The protective gas spray gun blows inert gas at 100-200 °C into the air hole. The blown inert gas and the original air in the hot pressing die are blown out through the air holes without the protective gas spray gun and the upper and lower sides of the hot pressing die. The gas flow rate sprayed by the protective gas spray gun is 0.1-0.4 MPa, and the duration is 5-10 minutes, and then the spray gun valve is closed.

[0023] Further, the electroplating device includes a perforated nickel plate, a pressure pump, a power supply, an electroplating tank, and a circulation pipeline. There are two perforated nickel plates, one above the other, in the electroplating tank. The holes in the perforated nickel plate are vertical through-holes and there are multiple of them. The two perforated nickel plates are connected to the positive pole of the power supply outside the electroplating tank through wires. The carbon fiber cloth in a two-dimensional weaving pattern is connected to the negative pole of the power supply outside the electroplating tank through wires. The carbon fiber cloth in a two-dimensional weaving pattern is located between the two perforated nickel plates. The circulation pipeline is provided with a pressure pump. The liquid inlet of the circulation pipeline is in an inverted funnel shape and is located directly above the two perforated nickel plates. The electroplating liquid nozzles are located directly below the two perforated nickel plates. Multiple liquid outlet holes are evenly distributed on the electroplating liquid nozzles. When the electroplating device is in use, the electroplating liquid sprayed out from the electroplating liquid nozzles passes through the perforated nickel plates and blows onto the carbon fiber cloth in a two-dimensional weaving pattern, enabling the carbon fiber cloth in a two-dimensional weaving pattern to be suspended between the two perforated nickel plates.

[0024] Advantages and Effects

[0025] For the fiber-reinforced aluminum-magnesium laminated composite material prepared by the method of the present invention, by using the carbon fiber reinforcing phase added to the composite material, the specific strength of the aluminum-magnesium laminated composite material can be improved. Through the pretreatment of the carbon fiber material, the mutual bonding ability between different materials can be significantly improved, and the service life of the overall material can be increased.

[0026] For the fiber-reinforced aluminum-magnesium laminated composite material prepared by the method of the present invention, the bonding between the laminated interfaces is good, and the geometric shape of the carbon fiber is complete. It further broadens the application scope of the fiber reinforcing phase in the field of manufacturing components of laminated composite materials. Brief Description of the Drawings

[0027] The present invention will be further described below in conjunction with the drawings and specific embodiments. The protection scope of the present invention is not limited only to the description of the following content.

[0028] Figure 1 It is a schematic structural diagram of a carbon fiber cloth in a two-dimensional weaving pattern;

[0029] Figure 2 It is a schematic structural diagram of each layer of the carbon fiber cloth in a two-dimensional weaving pattern;

[0030] Figure 3 It is a schematic structural diagram of the electroplating device;

[0031] Figure 4 It is a schematic diagram of the hole position layout of the electroplating liquid nozzle;

[0032] Figure 5 It is a schematic structural diagram of the hot pressing die located in the vacuum hot pressing furnace;

[0033] Figure 6 It is a schematic cross-sectional view of the hot pressing die;

[0034] Figure 7Microscopic morphology diagram of carbon fiber cloth with two-dimensional weaving method after electroplating treatment;

[0035] Figure 8 Cross-sectional microscopic morphology diagram of laminated composite material (magnified 200 times);

[0036] Figure 9 Cross-sectional microscopic morphology diagram of laminated composite material (magnified 150 times);

[0037] Explanation of reference numerals: 1. Nickel plate with holes, 2. Pressure pump, 3. Power supply, 4. Electroplating bath, 5. Carbon fiber cloth with two-dimensional weaving method, 6. Electroplating solution nozzle, 7. Aluminum plate, 8. Magnesium plate, 9. Hot pressing rod, 10. Hot pressing head, 11. Hot pressing die, 12. Protective gas spray gun, 13. Furnace body, 14. Air holes, 15. Circulation pipeline, 16. Liquid inlet. Specific implementation mode

[0038] As Figure 1 And Figure 2 shown, a fiber-reinforced aluminum-magnesium laminated composite material is composed of an aluminum plate 7, a magnesium plate 8, and a carbon fiber cloth 5 with a two-dimensional weaving method. Nickel plating layers are uniformly attached to the upper and lower surfaces of the carbon fiber cloth 5 with a two-dimensional weaving method, and the thickness of the nickel plating layer is 20 - 80 μm. The fiber-reinforced aluminum-magnesium laminated composite material takes the aluminum plate 7 - carbon fiber cloth 5 with a two-dimensional weaving method - magnesium plate 8 - carbon fiber cloth 5 with a two-dimensional weaving method as a group, stacks 5 - 20 groups, and stacks an aluminum plate 7 on the carbon fiber cloth 5 with a two-dimensional weaving method in the last group of stacks as the outermost layer.

[0039] The carbon fiber material of the carbon fiber cloth 5 with a two-dimensional weaving method is PAN-based carbon fiber. Each bundle of carbon fibers is composed of multiple single-filament carbon fibers. The diameter of the single-filament carbon fiber is 0.005 - 0.008 mm. The two-dimensional weaving method is woven in a plain weave, twill weave, or satin weave manner. One bundle of carbon fibers is composed of 3000 - 12000 single-filament carbon fibers, and there is a 1 - 2 mm interval between adjacent bundles of carbon fibers. Such an interval helps to improve the overall bonding ability of the material.

[0040] The model of the aluminum plate 7 is one of the 2-series aluminum alloys to 7-series aluminum alloys, and the thickness is 0.1 - 0.5 mm; the model of the magnesium plate 8 is 1-series magnesium alloy or 2-series magnesium alloy, and the thickness is 0.1 - 0.5 mm.

[0041] A preparation method of a fiber-reinforced aluminum-magnesium laminated composite material is as follows:

[0042] 1) The carbon fiber cloth 5 in a two-dimensional weaving pattern is subjected to preliminary pretreatment such as degumming, electroplating, cleaning, and drying to enhance the bonding ability between the carbon fiber material and the aluminum plate 7 and the magnesium plate 8. The aluminum plate 7 and the magnesium plate 8 are subjected to preliminary pretreatment of grinding. The aluminum plate 7, the magnesium plate 8, and the carbon fiber cloth 5 in a two-dimensional weaving pattern are cut into the shape and size required by the hot pressing mold 11 and stacked alternately. Taking the aluminum plate 7 - carbon fiber cloth 5 in a two-dimensional weaving pattern - magnesium plate 8 - carbon fiber cloth 5 in a two-dimensional weaving pattern as a group, stack 5 to 20 groups, and place another aluminum plate 7 as the outermost layer after the last group of stacking, and place it in the hot pressing mold 11;

[0043] 2) Place the hot pressing mold 11 in a vacuum hot press furnace. The inner cavity of the hot pressing mold 11 is preferably circular or square. Evacuate the inside of the vacuum hot press furnace. The vacuum degree after evacuation in the vacuum hot press furnace is (1 - 2) -3 MPa, then introduce an inert gas. The temperature of the introduced inert gas is 100 - 200 °C, and the air pressure in the vacuum hot press furnace after introducing the inert gas is (1 - 2) -1 MPa;

[0044] 3) Apply a pressure of 10 - 15 MPa to the materials in the hot pressing mold 11. After heating to the aluminum-magnesium bonding temperature of 420 - 450 °C, keep the temperature and pressure constant for 4 - 8 h, stop heating and naturally cool to room temperature, relieve the pressure applied to the materials in the hot pressing mold 11, open the door of the vacuum hot press furnace and take out the materials in the hot pressing mold 11, and then the fiber-reinforced aluminum-magnesium laminated composite material can be obtained.

[0045] More specifically: The specific method steps of the preliminary pretreatment of the carbon fiber cloth 5 in a two-dimensional weaving pattern are as follows:

[0046] 1) Degumming: Put the carbon fiber cloth 5 in a two-dimensional weaving pattern into a vacuum heat treatment furnace, keep it at 400 - 500 °C for 0.5 - 1 h, and perform surface degumming by high-temperature burning to facilitate subsequent nickel plating treatment to enhance the bonding ability between the carbon fiber and the matrix material;

[0047] 2) Electroplating: Place the degummed carbon fiber cloth 5 in a two-dimensional weaving pattern flat in the electroplating device for surface nickel plating. The current density used for nickel plating is 0.4 - 0.6 A / dm 2 , and the electroplating time is controlled to be 3 - 8 min;

[0048] 3) Cleaning and drying: After cleaning the nickel-plated carbon fiber cloth 5 in a two-dimensional weaving pattern, place it in a vacuum drying oven and dry it at 60 - 80 °C for 6 - 12 h;

[0049] The specific method steps of the preliminary pretreatment of the aluminum plate 7 and the magnesium plate 8 are as follows: Use 800 - 1500# sandpaper for grinding to remove the surface oxide and prevent poor interlayer bonding.

[0050] As Figure 5 and Figure 6 shown, the hot pressing die 11 is integrally in a circular ring shape. There is a protruding ring in the middle of the inner side of the circular ring. A plurality of air holes 14 are evenly arranged on the circumference of the hot pressing die 11. The air holes 14 communicate the outer side of the hot pressing die 11 and the inner side of the protruding ring. The material to be hot pressed is located inside the protruding ring. Pressing plates are arranged on the upper and lower sides of the material to be hot pressed. The pressing plates are in contact with the hot pressing heads 10 at the ends of the hot pressing rods 9. The furnace body 13 of the vacuum hot pressing furnace passes through and is fixed with a protective gas spray gun 12. A valve is provided on the protective gas spray gun 12 located outside the furnace body 13. The protective gas spray guns 12 are symmetrically arranged in 2 or 4. Each protective gas spray gun 12 faces one of the air holes 14. The inert gas introduced is introduced through the protective gas spray gun 12. The protective gas spray gun 12 blows inert gas at 100 - 200 °C towards the air hole 14. The blown inert gas and the original air inside the hot pressing die 11 are blown out through the air holes 14 without the protective gas spray gun 12 and the upper and lower sides of the hot pressing die 11, achieving the purpose of preheating the sample and blowing away oxygen to prevent the sample from oxidizing. The gas flow rate sprayed by the protective gas spray gun 12 is 0.1 - 0.4 MPa, and the duration is 5 - 10 minutes. Then, the spray gun valve is closed.

[0051] As Figure 3 and Figure 4 shown, the electroplating device includes a perforated nickel plate 1, a pressure pump 2, a power supply 3, an electroplating bath 4, and a circulation pipeline 15. There are two upper and lower perforated nickel plates 1 in the electroplating bath 4. The holes of the perforated nickel plate 1 are vertical through holes and there are multiple. The two perforated nickel plates 1 are connected to the positive electrode of the power supply 3 outside the electroplating bath 4 through wires. The carbon fiber cloth 5 in a two - dimensional weaving pattern is connected to the negative electrode of the power supply 3 outside the electroplating bath 4 through wires. When in use, the perforated nickel plate 1 is preferably suspended outside the electroplating bath 4 by a suspension wire and on any fixed object above, so that it floats in the electroplating bath 4. The carbon fiber cloth 5 in a two - dimensional weaving pattern is located between the two perforated nickel plates 1. The circulation pipeline 15 is provided with a pressure pump 2. The liquid inlet 16 of the circulation pipeline 15 is in an inverted funnel shape and is located directly above the two perforated nickel plates 1. The electroplating liquid spray nozzles 6 are located directly below the two perforated nickel plates 1. The electroplating liquid spray nozzles 6 are evenly provided with multiple liquid outlet holes. When the electroplating device is in use, the electroplating liquid sprayed by the electroplating liquid spray nozzles 6 passes through the perforated nickel plate 1 and blows onto the carbon fiber cloth 5 in a two - dimensional weaving pattern, so that the carbon fiber cloth 5 in a two - dimensional weaving pattern can float between the two perforated nickel plates 1. A drag net can also be suspended in the electroplating bath 4. The carbon fiber cloth 5 in a two - dimensional weaving pattern is placed on the drag net, which is more conducive to maintaining the position of the carbon fiber cloth 5 in a two - dimensional weaving pattern.

[0052] The components of the electroplating solution include: nickel sulfate 220 - 260 g / L, nickel chloride 40 - 60 g / L, boric acid 35 - 55 g / L, and sodium dodecyl sulfate 0.1 g / L.

[0053] Figure 7 The micro-topography image of the carbon fiber surface after electroplating the carbon fiber cloth with a two-dimensional weaving method. It can be seen from the figure that the electroplating quality on the surface of the carbon fiber material is good, and the material attachment on the surface is uniform, which is beneficial for the next hot pressing operation.

[0054] Figure 8 and Figure 9 The cross-sectional micro-topography image of the fiber-reinforced aluminum-magnesium laminated composite material. It can be seen from the figure that there are no obvious defects in the overall material, and the carbon fiber, aluminum plate, and magnesium plate are well combined, indicating that this method can effectively realize the preparation of the fiber-reinforced aluminum-magnesium laminated composite material.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A fiber-reinforced aluminum-magnesium laminate composite material, characterized in that: The fiber-reinforced aluminum-magnesium laminated composite material is composed of an aluminum plate (7), a magnesium plate (8) and a two-dimensionally woven carbon fiber cloth (5). A nickel plating layer is evenly attached to the upper and lower surfaces of the two-dimensionally woven carbon fiber cloth (5). The thickness of the nickel plating layer is 20 to 80 μm. The fiber-reinforced aluminum-magnesium laminated composite material is a group of aluminum plate (7)-two-dimensionally woven carbon fiber cloth (5)-magnesium plate (8)-two-dimensionally woven carbon fiber cloth (5). 5 to 20 groups are stacked, and an aluminum plate (7) is stacked on the last group of stacked two-dimensionally woven carbon fiber cloth (5) as the outermost layer.

2. The fiber-reinforced aluminum-magnesium laminate composite material according to claim 1, characterized in that: The carbon fiber material of the two-dimensionally woven carbon fiber cloth (5) is PAN-based carbon fiber, each bundle of carbon fibers is composed of a plurality of single-filament carbon fibers, the diameter of the single-filament carbon fibers is 0.005-0.008 mm, the two-dimensionally woven method is plain weave, twill weave or satin weave, a bundle of carbon fibers is composed of 3000-12000 single-filament carbon fibers, and each adjacent bundle of carbon fibers has a spacing of 1-2 mm.

3. The fiber-reinforced aluminum-magnesium laminated composite material according to claim 1, characterized in that: The aluminum plate (7) is of a type from 2 series aluminum alloy to 7 series aluminum alloy, with a thickness of 0.1 to 0.5 mm; the magnesium plate (8) is of a type from 1 series magnesium alloy to 2 series magnesium alloy, with a thickness of 0.1 to 0.5 mm.

4. A method for preparing a fiber-reinforced aluminum-magnesium laminated composite material as claimed in claim 1, characterized in that: Here are the steps: 1) cutting an aluminum plate (7), a magnesium plate (8) and a two-dimensionally woven carbon fiber cloth (5) into shapes and sizes required by a hot pressing mold (11), and stacking them alternately, with an aluminum plate (7)-two-dimensionally woven carbon fiber cloth (5)-magnesium plate (8)-two-dimensionally woven carbon fiber cloth (5) as one group, stacking 5 to 20 groups, and placing another aluminum plate (7) as the outermost layer after the last group is stacked, and placing them in the hot pressing mold (11); 2) placing the hot pressing mold (11) in a vacuum hot pressing furnace, evacuating the vacuum hot pressing furnace, and then introducing an inert gas; 3) applying pressure to the material in the hot pressing mold (11), heating it to the aluminum-magnesium bonding temperature, maintaining the temperature and pressure constant for a period of time, stopping heating and cooling naturally to room temperature, releasing the pressure applied by the material in the hot pressing mold (11), opening the vacuum hot pressing furnace door and taking out the material in the hot pressing mold (11), and obtaining a fiber-reinforced aluminum-magnesium laminated composite material.

5. The method for preparing the fiber-reinforced aluminum-magnesium laminated composite material according to claim 4, characterized in that: The vacuum degree after evacuation in the vacuum hot pressing furnace is (1-2) -3 MPa, the temperature of the inert gas introduced is 100-200℃, and the pressure in the vacuum hot press furnace after the inert gas is introduced is (1~2) -1 MPa, the pressure applied to the material in the hot pressing mold (11) is 10-15 MPa, the aluminum-magnesium bonding temperature is maintained at 420-450°C, and the insulation time is 4-8 hours.

6. The method for preparing the fiber-reinforced aluminum-magnesium laminated composite material according to claim 4, characterized in that: The two-dimensionally woven carbon fiber cloth (5) needs to be pre-treated by degumming, electroplating, cleaning and drying, and the aluminum plate (7) and magnesium plate (8) need to be pre-treated by grinding.

7. The method for preparing the fiber-reinforced aluminum-magnesium laminated composite material according to claim 6, characterized in that: The specific method and steps for the preliminary pretreatment of the two-dimensional woven carbon fiber cloth (5) are as follows: 1) Degumming: The two-dimensional woven carbon fiber cloth (5) is placed in a vacuum heat treatment furnace and kept at 400-500° C. for 0.5-1 h, and the surface is degummed by high-temperature burning; 2) Electroplating: The degummed two-dimensional woven carbon fiber cloth (5) is evenly arranged in an electroplating device for surface nickel plating. The current density used for nickel plating is 0.4-0.6A / dm 2 , the electroplating time is controlled to be 3 to 8 minutes; 3) Cleaning and drying: After cleaning the nickel-plated two-dimensional woven carbon fiber cloth (5), place it in a vacuum drying oven and dry it at 60-80° C. for 6-12 hours; The specific method and steps for the preliminary pretreatment of the aluminum plate (7) and the magnesium plate (8) are as follows: use 800-1500# sandpaper for grinding to remove surface oxides.

8. The method for preparing the fiber-reinforced aluminum-magnesium laminated composite material according to claim 4, characterized in that: The hot pressing mold (11) is annular in shape as a whole, with a protruding ring in the middle of the inner side of the ring. A plurality of air holes (14) are evenly opened around the hot pressing mold (11), and the air holes (14) are connected to the outer side of the hot pressing mold (11) and the inner side of the protruding ring. The material to be hot pressed is located on the inner side of the protruding ring. Press plates are provided on the upper and lower sides of the material to be hot pressed, and the press plates are in contact with the hot pressing head (10) at the end of the hot pressing rod (9). A protective gas spray gun (12) passes through and is fixed on the furnace body (13) of the vacuum hot pressing furnace. The protective gas spray gun (12) is located outside the furnace body (13) and is provided with a valve. The protective gas spray gun (12) is symmetrically arranged with two or four, and each protective gas spray gun (12) is directly facing one of the air holes (14).

9. The method for preparing a fiber-reinforced aluminum-magnesium laminated composite material according to claim 8, characterized in that: The inert gas introduced in the step 3) is introduced through a protective gas spray gun (12). The protective gas spray gun (12) blows an inert gas of 100-200° C. toward the air hole (14). The blown inert gas and the air originally in the hot pressing mold (11) are blown out through the air hole (14) where the protective gas spray gun (12) is not provided and the upper and lower sides of the hot pressing mold (11). The gas flow rate of the protective gas spray gun (12) is 0.1-0.4 MPa, and the duration is 5-10 minutes, and then the spray gun valve is closed.

10. The method for preparing the fiber-reinforced aluminum-magnesium laminated composite material according to claim 7, characterized in that: The electroplating device comprises a perforated nickel plate (1), a pressure pump (2), a power source (3), an electroplating tank (4) and a circulation pipeline (15). The electroplating tank (4) contains two upper and lower perforated nickel plates (1). The holes of the perforated nickel plates (1) are vertical through holes and there are a plurality of them. The two perforated nickel plates (1) are connected to the positive electrode of the power source (3) outside the electroplating tank (4) through a wire. The two-dimensionally woven carbon fiber cloth (5) is connected to the negative electrode of the power source (3) outside the electroplating tank (4) through a wire. The two-dimensionally woven carbon fiber cloth (5) is located between the two perforated nickel plates (1). The circulation pipeline (15) is provided with a pressure pump (2); the liquid inlet (16) of the circulation pipeline (15) is in an inverted funnel shape and is located directly above the two perforated nickel plates (1); the electroplating liquid nozzle (6) is located directly below the two perforated nickel plates (1); the electroplating liquid nozzle (6) is evenly provided with a plurality of liquid outlet holes; when the electroplating device is in use, the electroplating liquid sprayed from the electroplating liquid nozzle (6) passes through the perforated nickel plates (1) and is blown onto the two-dimensionally woven carbon fiber cloth (5), so that the two-dimensionally woven carbon fiber cloth (5) can be suspended between the two perforated nickel plates (1).

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