Apparatus and method for producing recycled carbon fiber reinforced metal matrix composite

Abstract

The application relates to the technical field of carbon fiber recycling and reuse, and discloses a device and a method for preparing a regenerated carbon fiber reinforced metal matrix composite material, which comprises a flux-cored wire forming machine for preparing the composite material, the core of the composite material is a regenerated short fiber, and the outer part of the composite material is a metal matrix; a protective cover is internally provided with a heating furnace through a moving piece, the inner bottom end of the protective cover is provided with a receiving plate, and the heating furnace moves above the receiving plate through the moving piece; a conveying piece is arranged at the top end of the protective cover, the composite material is conveyed into the heating furnace through the conveying piece, the composite material is conveyed onto the receiving plate after being heated by the heating furnace, and the temperature of the composite material is adjusted by adjusting the temperature of the receiving plate, so that the core and the outer part of the composite material and the outer part and the outer part realize interlayer combination. The application improves the preparation difficulty of the mixture of the regenerated carbon fiber and the metal matrix, improves the reinforcing effect of the regenerated carbon fiber on the metal matrix, and improves the application value of the regenerated carbon fiber.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber recycling technology, and in particular to an apparatus and method for preparing recycled carbon fiber reinforced metal matrix composites. Background Technology

[0002] In recent years, with the widespread use of fiber products, a large amount of waste fiber generated during production and use can still retain some excellent properties after recycling, becoming an important source of chopped fibers. Chopped fibers are typically 0.1-5 mm in length and highly anisotropic. Resin-based composites reinforced with these fibers are widely used in aerospace, automotive, sports and leisure, and wind power industries due to their high strength, high specific modulus, corrosion resistance, and good thermal stability. The performance of these composites is related to fiber length, content, interfacial properties, and orientation. Processed short fibers often yield unoriented chopped fibers, which is not conducive to the recycling of recycled fibers. Recycling technologies such as pyrolysis and chemical depolymerization can stably extract recycled carbon fibers, solving the fundamental problem of "difficult recycling." However, on the other hand, the performance of these recycled carbon fibers is somewhat reduced compared to virgin fibers, and their surface conditions are complex. Developing suitable metal-based composite processes tailored to their characteristics has become a core obstacle to high-value utilization. Currently, industry research focuses mainly on recycled carbon fiber reinforced resin-based composites, with very little exploration of metal-based composites. The key technical aspects, such as the interfacial bonding strength between the metal matrix and recycled carbon fiber and the stability of the molding process, lack systematic research data and mature solutions. This makes it difficult for recycled carbon fiber to enter the application field of metal matrix composites with higher performance requirements, thus limiting its potential for value enhancement.

[0003] Therefore, there is an urgent need for an apparatus and method for preparing recycled carbon fiber reinforced metal matrix composites to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for preparing recycled carbon fiber reinforced metal matrix composites, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides an apparatus for preparing recycled carbon fiber reinforced metal matrix composites, comprising:

[0006] A flux-cored wire forming machine is used to prepare composite materials, wherein the core of the composite material is recycled short fibers and the outer part of the composite material is a metal matrix;

[0007] A protective cover has a heating furnace installed inside via a movable component. A receiving plate is provided at the bottom of the inside of the protective cover, and the heating furnace moves above the receiving plate via the movable component.

[0008] A conveyor is installed at the top of the protective cover. The composite material is conveyed to the heating furnace through the conveyor. After being heated by the heating furnace, the composite material is conveyed to the receiving plate. The temperature of the composite material is adjusted by adjusting the temperature of the receiving plate, so that the core and the outside of the composite material and the outside of the composite material are bonded together.

[0009] Preferably, the heating furnace includes a furnace tube, a heating layer, a heat insulation layer, a heat insulation and air cooling layer, and a metal shell arranged sequentially from the inside to the outside. The top and bottom ends of the furnace tube are respectively connected to a conveying pipe and a nozzle. The top of the furnace tube is connected to an air inlet, and the air inlet is connected to a vacuum port. A pressure gauge and a valve are installed on the furnace tube, and a thermocouple and a centrifugal fan are installed on the metal shell.

[0010] Preferably, it also includes a temperature control panel, which is fixedly connected to the heating furnace, and the temperature control panel is provided with a voltmeter, an ammeter, a control button and a temperature controller.

[0011] Preferably, the moving part includes a Y-axis moving stage, a Z-axis moving stage, and an X-axis moving stage. The heating furnace is mounted on the X-axis moving stage, and the X-axis moving stage is mounted on the Y-axis moving stage via the Z-axis moving stage. The Y-axis moving stage is fixedly connected to the bottom of the inner side of the protective cover.

[0012] Preferably, the conveying component includes a motor and two conveying wheels mounted on the protective cover. The composite material is located between the two conveying wheels and is in contact with the conveying wheels. The composite material passes through the two conveying wheels and is conveyed into the conveying pipe. The motor is used to drive one of the conveying wheels to rotate.

[0013] Preferably, it also includes an industrial liquid nitrogen storage tank, which is connected to the protective cover via a metal gas guide pipe. The metal gas guide pipe is equipped with a fine-tuning valve, a flow meter, and a high-pressure regulating valve. An electric heating vaporizer is installed at the output end of the industrial liquid nitrogen storage tank.

[0014] Preferably, the cross-section of the composite material is circular, elliptical, or flat and elongated.

[0015] Preferably, the recycled short fiber is one or more of carbon fiber, glass fiber, natural fiber, polyimide fiber, and chemical fiber, and the metal matrix is ​​aluminum-based.

[0016] A method for preparing recycled carbon fiber reinforced metal matrix composites includes the following steps:

[0017] A composite material with a core of recycled short fibers and an outer metal matrix is ​​prepared using the flux-cored wire forming machine.

[0018] The composite material is conveyed through the conveyor to the heating furnace and heated to a ductile state where the metal matrix is ​​softened.

[0019] After the composite material is heated, it is conveyed to the receiving plate. Under the protection of inert gas, the temperature of the composite material is adjusted by regulating the temperature of the receiving plate, so that the core and the outside of the composite material on the receiving plate are bonded together as well as the outside and the outside are bonded together to form the final material.

[0020] Preferably, the flux-cored wire forming machine prepares composite materials through a flux-cored wire forming process or an online dual-belt composite process.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects:

[0022] This invention provides an apparatus and method for preparing recycled carbon fiber reinforced metal matrix composites. In use, a composite material with a core of recycled short fibers and an outer metal matrix is ​​prepared using a flux-cored wire forming machine. The composite material is then conveyed to a heating furnace and heated until the metal matrix softens to a ductile state. After heating, the composite material is conveyed to a receiving plate. Under the protection of an inert gas atmosphere, the temperature of the composite material is adjusted by regulating the temperature of the receiving plate, enabling interlayer bonding between the core and outer layers, as well as between the outer layers themselves, to form the final material. This invention improves the difficulty of preparing recycled carbon fiber and metal matrix mixtures by using fused deposition metal embedding of recycled carbon fibers, and enhances the reinforcing effect of recycled carbon fibers on the metal matrix by editing the orientation design of the recycled carbon fibers. The resulting recycled carbon fiber reinforced metal matrix composite material exhibits excellent comprehensive performance, enhancing the application value of recycled carbon fibers. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the heating furnace structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the industrial liquid nitrogen storage tank structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the nozzle structure of the present invention;

[0028] Figure 5This is a schematic diagram showing the state of the composite material prepared by the dual-belt composite process of the present invention;

[0029] Among them, 1. Flux-cored wire forming machine; 101. Left metal strip unwinding mechanism; 102. Right metal strip unwinding structure; 103. Carbon fiber quantitative feeding device; 104. High-pressure rolling roller pair; 2. Protective cover; 3. Heating furnace; 31. Furnace tube; 32. Heating layer; 33. Insulation layer; 34. Insulation and air-cooling layer; 35. Metal shell; 36. Conveying pipe; 37. Nozzle; 371. Feed inlet; 372. Surround heating element; 373. Hyperbolic streamlined inner wall; 374. Gradual shearing angle; 375. Shaping 38. Outlet; 39. Inlet; 310. Vacuum port; 311. Pressure gauge; 312. Valve; 313. Thermocouple; 314. Centrifugal fan; 4. Receiver plate; 5. Temperature control panel; 6. Voltage and ammeter; 7. Control button; 8. Temperature controller; 9. Y-axis moving stage; 10. Z-axis moving stage; 11. X-axis moving stage; 12. Motor; 13. Conveyor wheel; 14. Industrial liquid nitrogen storage tank; 15. Metal gas guide pipe; 16. Fine-tuning valve; 17. Flow meter; 18. High-pressure regulating valve; 19. Electric heating vaporizer. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1-5 This invention provides an apparatus for preparing recycled carbon fiber reinforced metal matrix composites, comprising:

[0033] Flux-cored wire forming machine 1 is used to prepare composite materials, wherein the core of the composite material is recycled short fibers and the outer part of the composite material is a metal matrix;

[0034] The protective cover 2 has a heating furnace 3 installed inside via a movable component. A receiving plate 4 is provided at the bottom of the protective cover 2. The heating furnace 3 moves above the receiving plate 4 via the movable component.

[0035] The conveyor is set at the top of the protective cover 2. The composite material is conveyed to the heating furnace 3 through the conveyor. After being heated by the heating furnace 3, the composite material is conveyed to the receiving plate 4. The temperature of the composite material is adjusted by adjusting the temperature of the receiving plate 4, so that the core and the outside of the composite material and the outside of the outside can be bonded together.

[0036] In one embodiment of the present invention, a composite material with a core of recycled short fibers and an outer metal matrix is ​​prepared by a flux-cored wire forming machine 1. The composite material is then conveyed to a heating furnace 3 via a conveyor and heated until the metal matrix is ​​softened into a plastic state. After heating, the composite material is conveyed to a receiving plate 4. Under the protection of an inert gas, the temperature of the composite material is adjusted by regulating the temperature of the receiving plate 4, so that the core and the outer layer of the composite material on the receiving plate 4 are bonded together, as well as the outer layer and the outer layer are bonded together, to form the final material.

[0037] As an optional implementation, the heating furnace 3 includes a furnace tube 31, a heating layer 32, an insulation layer 33, an insulation and air-cooling layer 34, and a metal shell 35 arranged sequentially from the inside to the outside. The top and bottom ends of the furnace tube 31 are respectively connected to a conveying pipe 36 and a nozzle 37. The top of the furnace tube 31 is connected to an air inlet 38, and the air inlet 38 is connected to a vacuum port 39. A pressure gauge 310 and a valve 311 are installed on the furnace tube 31, and a thermocouple 312 and a centrifugal fan 313 are installed on the metal shell 35.

[0038] In one embodiment of the present invention, the heating furnace 3 includes a metal outer shell 35, three independently arranged molybdenum-containing resistance wire heating layers 32, a quartz glass furnace tube 31, a ceramic fiber insulation layer 33, and an air-cooling system; the three-section temperature control system includes three sections of heating resistance wire, three sets of thermocouples 312, and three sets of intelligent controllers, which can independently adjust the temperature of each section; the air-cooling system includes a centrifugal fan 313. The furnace tube 31 is also equipped with a vacuum port 39, an air inlet 38, a pressure gauge 310, and a valve 311 for regulating the gas pressure inside the furnace and discharging waste gas.

[0039] Specifically, the nozzle 37 includes a feed inlet 371, a surrounding heating element 372, a hyperbolic streamlined inner wall 373, a tapered shear angle 374, and a shaping outlet 375. The feed inlet 371 is adapted to different cross-sectional shapes, the surrounding heating element 372 is a resistor, the hyperbolic streamlined inner wall 373 is designed without dead angles, the tapered shear angle 374 is used to generate a velocity gradient, and the shaping outlet 375 determines the layer thickness and is adapted to different cross-sectional shapes.

[0040] As an optional implementation, it also includes a temperature control panel 5, which is fixedly connected to the heating furnace 3. The temperature control panel 5 is equipped with a voltage and current meter 6, a control button 7, and a temperature controller 8.

[0041] In one embodiment of the present invention, the conveyor, the heating furnace 3, the nozzle 37 and the receiving plate 4 are all connected to the control system. The control system includes a temperature control panel 5, a voltage and current meter 6, a control button 7 and a temperature controller 8, which are used to regulate the operating parameters of each unit.

[0042] As an optional implementation, the moving parts include a Y-axis moving stage 9, a Z-axis moving stage 10 and an X-axis moving stage 11. The heating furnace 3 is mounted on the X-axis moving stage 11, and the X-axis moving stage 11 is mounted on the Y-axis moving stage 9 via the Z-axis moving stage 10. The Y-axis moving stage 9 is fixedly connected to the bottom of the inner side of the protective cover 2.

[0043] In one embodiment of the present invention, the heating furnace 3 is moved along the Y-axis, Z-axis and X-axis by setting the Y-axis moving stage 9, Z-axis moving stage 10 and X-axis moving stage 11, so that the plastic composite material is fed into the nozzle 37 adapted to its interface shape. The velocity gradient generated by the gradually narrowing flow field forms a shear force, and at the same time, the shear force is generated by the velocity difference between the nozzle 37 and the receiving plate 4 below, so that the regenerated short fibers in the composite material are oriented and aligned along the shear direction.

[0044] As an optional implementation, the conveying component includes a motor 12 and two conveying wheels 13 mounted on the protective cover 2. The composite material is located between the two conveying wheels 13 and is in contact with the conveying wheels 13. After passing through the two conveying wheels 13, the composite material is conveyed into the conveying pipe 36. The motor 12 is used to drive one of the conveying wheels 13 to rotate.

[0045] In one embodiment of the present invention, the composite material is clamped and conveyed to the heating process by two conveying wheels 13. One of the two conveying wheels 13 is a driving wheel driven by a motor 12 and a driven wheel that cooperates with the driving wheel through a spring elastic element. The composite material is conveyed by friction between the two wheels.

[0046] As an optional implementation, it also includes an industrial liquid nitrogen storage tank 14, which is connected to the protective cover 2 via a metal gas pipe 15. The metal gas pipe 15 is equipped with a fine-tuning valve 16, a flow meter 17, and a high-pressure regulating valve 18. An electric heating vaporizer 19 is installed at the output end of the industrial liquid nitrogen storage tank 14.

[0047] In one embodiment of the present invention, the interior of the protective cover 2 is an inert gas environment. The inert gas protective environment is provided by an industrial liquid nitrogen storage tank 14, and is formed after being vaporized by an electric heating vaporizer 19, regulated by a high-pressure regulating valve 18, and controlled by a flow meter 17.

[0048] As an alternative implementation, the cross-section of the composite material is circular, elliptical, or flat and elongated.

[0049] In one embodiment of the present invention, the composite material can be prepared into a cylindrical shape or a long strip shape.

[0050] As an optional implementation, the recycled short fiber is one or more of carbon fiber, glass fiber, natural fiber, polyimide fiber, and chemical fiber, and the metal matrix is ​​aluminum-based.

[0051] In one embodiment of the present invention, the regenerated short fiber can be one or more of carbon fiber, glass fiber, natural fiber, polyimide fiber, and chemical fiber, and the metal matrix can be aluminum-based, thereby preparing a composite material with a core of regenerated short fiber and an outer metal matrix.

[0052] A method for preparing recycled carbon fiber reinforced metal matrix composites includes the following steps:

[0053] A composite material with a core of recycled short fibers and an outer metal matrix was prepared using a flux-cored wire forming machine 1.

[0054] The composite material is conveyed to the heating furnace 3 via a conveyor and heated to a plastic state where the metal matrix is ​​softened;

[0055] After the composite material is heated, it is transported to the receiving plate 4. Under the protection of inert gas, the temperature of the composite material is adjusted by regulating the temperature of the receiving plate 4, so that the core and the outside of the composite material on the receiving plate 4 are bonded together, forming the final material.

[0056] In one embodiment of the present invention, carbon fiber reinforced metal matrix composite material manufactured by flux-cored wire forming machine 1 is conveyed into heating furnace 3 via conveyor wheel 13. Heating furnace 3 controls the temperature to fully soften the aluminum on the material surface to a plastic state. The plastic carbon fiber reinforced metal matrix composite material enters nozzle 37. Power transmission between heating furnace 3 and nozzle 37 creates a velocity gradient in the composite material reaching nozzle 37, subjecting it to shear force. Due to the abrupt change in flow velocity in the contracting flow field, the flow force acts on the fibers, causing a velocity difference within the fibers themselves. The high-velocity fiber portion pulls the rear section of the fiber, causing the overall fiber shape to align towards the direction of high velocity, thus achieving reorientation of the fibers in the material. Additionally, the velocity difference between nozzle 37 and receiving plate 4 also generates shear force, carbon... The fibers will preferentially align along the shear direction. The greater the speed of nozzle 37, the greater the speed difference between the two, the stronger the shearing effect, and the more obvious the consistency of orientation. The oriented composite material is received by receiving plate 4 with controllable temperature. During the orientation process, nozzle 37 can also be appropriately heated to reduce interlayer cracking. Receiving plate 4 can be set to low-temperature constant temperature heating. Low temperature can avoid the material cooling rate too fast and ensure the adhesion between multiple layers of composite metal matrix. At the same time, the gas source is provided by industrial liquid nitrogen storage tank 14. After the output pressure is precisely controlled by high pressure regulating valve 18, the nitrogen enters electric heating vaporizer 19 to complete pressure stabilization vaporization treatment. Then, the flow rate is precisely controlled by flow meter 17 and continuously delivered to the printing cavity equipped with protective cover 2 to form an inert protective environment and inhibit the oxidation reaction of metal matrix.

[0057] Specifically, the composite material has a diameter of 2.5 mm, and its chopped fibers have a length of 0.1-5 mm. The motor 12 has a power of 50 W. The heating furnace 3 has a power of 5 KW, which can rapidly heat the composite material to a plastic state at 350℃. The heating furnace pipe has an inner diameter of 3 mm, a minimum inner diameter of 5 mm at the upper end of the discharge port, a maximum width of 3 mm and a length of 10 mm at the lower end of the discharge port. The nozzle 37 has a temperature of 150℃, and the receiving plate 4 has a temperature of 100℃. The relative moving speed of the nozzle 37 is 50 mm / s. The industrial liquid nitrogen storage tank 14 has a capacity of 100 L, and the electric heating vaporization rate is ≥3 m³ / s. 3 / h, the high-pressure regulating valve 18 has an input of 10MPa and an output of 0.5MPa. The flow meter 17 controls the flow rate at 20L / min.

[0058] As an optional implementation, the flux-cored wire forming machine 1 prepares composite materials through a flux-cored wire forming process or an online dual-belt composite process.

[0059] In one embodiment of the present invention, a flux-cored wire forming process is used to bend a metal strip into a U-shaped groove through multiple rolls, fill it with recycled short fibers online, and then draw it in a closed loop to obtain a composite wire with a circular or elliptical cross-section.

[0060] High-efficiency flat strip fabrication: An online dual-strip composite process is employed. Regenerated short fibers are supplied via a carbon fiber quantitative feeding device 103, sandwiched between two metal strips conveyed by a left metal strip unwinding mechanism 101 and a right metal strip unwinding structure 102. These strips are then compacted by a high-pressure rolling roller 104, resulting in a sandwich-structured composite strip with a flat, elongated cross-section. The diameter or width of the filament or strip can range from 2-5 mm, and the length of the regenerated short fibers is 0.1-5 mm.

[0061] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An apparatus for preparing recycled carbon fiber reinforced metal matrix composites, characterized in that, include: A flux-cored wire forming machine (1) is used to prepare composite materials, wherein the core of the composite material is recycled short fibers and the outer part of the composite material is a metal matrix; The protective cover (2) has a heating furnace (3) installed inside via a movable component. A receiving plate (4) is provided at the bottom of the interior of the protective cover (2). The heating furnace (3) moves above the receiving plate (4) via the movable component. The conveyor is set at the top of the protective cover (2). The composite material is conveyed to the heating furnace (3) through the conveyor. After being heated by the heating furnace (3), the composite material is conveyed to the receiving plate (4). The temperature of the composite material is adjusted by adjusting the temperature of the receiving plate (4) so ​​that the core and the outside of the composite material and the outside and the outside can achieve interlayer bonding. The heating furnace (3) includes a furnace tube (31), and the top and bottom ends of the furnace tube (31) are respectively connected to a conveying pipe (36) and a nozzle (37); the nozzle (37) includes a feed inlet (371), a surrounding heating element (372), a hyperbolic streamlined inner wall (373), a tapered shear angle (374), and a shaping outlet (375).

2. A device for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 1, characterized by: The furnace tube (31) is provided with a heating layer (32), an insulation layer (33), an insulation and air-cooling layer (34) and a metal shell (35) arranged from the inside to the outside. The top of the furnace tube (31) is connected to an air inlet (38), and the air inlet (38) is connected to a vacuum port (39). A pressure gauge (310) and a valve (311) are installed on the furnace tube (31), and a thermocouple (312) and a centrifugal fan (313) are installed on the metal shell (35).

3. The apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 1, wherein: It also includes a temperature control panel (5), which is fixedly connected to the heating furnace (3). The temperature control panel (5) is equipped with a voltage and current meter (6), a control button (7), and a temperature controller (8).

4. The apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 1, characterized by: The moving parts include a Y-axis moving stage (9), a Z-axis moving stage (10) and an X-axis moving stage (11). The heating furnace (3) is mounted on the X-axis moving stage (11). The X-axis moving stage (11) is mounted on the Y-axis moving stage (9) via the Z-axis moving stage (10). The Y-axis moving stage (9) is fixedly connected to the bottom of the inner side of the protective cover (2).

5. The apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 2, characterized by: The conveying component includes a motor (12) and two conveying wheels (13) mounted on the protective cover (2). The composite material is located between the two conveying wheels (13) and is in contact with the conveying wheels (13). The composite material passes through the two conveying wheels (13) and is conveyed into the conveying pipe (36). The motor (12) is used to drive one of the conveying wheels (13) to rotate.

6. The apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 1, characterized by: It also includes an industrial liquid nitrogen storage tank (14), which is connected to the protective cover (2) through a metal gas pipe (15). The metal gas pipe (15) is equipped with a fine-tuning valve (16), a flow meter (17) and a high-pressure regulating valve (18). An electric heating vaporizer (19) is installed at the output end of the industrial liquid nitrogen storage tank (14).

7. The apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to claim 1, wherein: The cross-section of the composite material is circular, elliptical, or flat and elongated.

8. The apparatus for preparing recycled carbon fiber reinforced metal matrix composites according to claim 1, characterized in that: The recycled short fibers are one or more of carbon fiber, glass fiber, natural fiber, and polyimide fiber, and the metal matrix is ​​aluminum-based.

9. A method of producing a recycled carbon fiber reinforced metal matrix composite material, suitable for use in an apparatus for producing a recycled carbon fiber reinforced metal matrix composite material according to any one of claims 1 to 8, characterized in that, Includes the following steps: A composite material with a core of recycled short fibers and an outer metal matrix is ​​prepared by the flux-cored wire forming machine (1); The composite material is conveyed through the conveyor to the heating furnace (3) and heated to a plastic state where the metal matrix is ​​softened; After the composite material is heated, it is transported to the receiving plate (4). Under the protection of inert gas, the temperature of the composite material is adjusted by adjusting the temperature of the receiving plate (4), so that the core and the outside of the composite material on the receiving plate (4) are bonded together, forming the final material.

10. The method of claim 9, wherein the method further comprises: The flux-cored wire forming machine (1) prepares composite materials through flux-cored wire forming process or online double-belt composite process.

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