Graphene reinforced copper alloy bar and preparation method thereof

Abstract

The invention discloses a graphene reinforced copper alloy bar and a preparation method thereof, and belongs to the technical field of copper alloys. The preparation method comprises the following steps: preparing a Cu-C master alloy bar; the first copper strip penetrates through a graphite box body, the surface of the first copper strip is covered with a layer of graphene, and the graphene on the surface layer is thinned and evenly coated through a polishing wheel; the treated first copper strip is wound on a Cu-C master alloy rod, sealing welding is conducted on the side face, the two ends are sealed and covered with copper materials, and a first copper roll is obtained; and the copper roll is subjected to equal-channel angular extrusion treatment, repeated extrusion and drawing are conducted, and the graphene reinforced copper alloy bar is obtained. According to the preparation method of the graphene reinforced copper alloy bar, graphene copper (Cu-C mother alloy) is put into a core part of a copper strip coil coated with graphene, then vacuum seal welding is carried out, equal-channel angular extrusion is utilized, so that the graphene can be uniformly distributed, the process is simplified, the efficiency is improved, and rapid mass production is realized at low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of copper alloys, and in particular relates to a graphene-reinforced copper alloy rod and a preparation method thereof. Background Art

[0002] Graphene-copper composites, a novel composite material created by adding graphene to copper, possess both high strength and electrical conductivity. These composites have broad application prospects in high-tech fields such as electronics and semiconductors, new energy and electric vehicles, aerospace, and military applications. However, due to the technical challenges of graphene's tendency to aggregate and its high production costs, a method for preparing graphene-copper composites that can overcome these challenges is urgently needed.

[0003] Currently, methods for preparing graphene-reinforced copper-based composites, such as powder metallurgy and electrochemical deposition, involve complex processes for powder preparation, sintering, deposition, and post-processing, resulting in high energy consumption, high costs, and low efficiency, making rapid mass production impossible. Furthermore, direct extrusion or drawing after powder mixing can easily lead to uneven graphene distribution and severe anisotropy.

[0004] Therefore, developing a graphene-enhanced copper alloy rod that can overcome the above problems is of great significance for the engineering application of copper alloys. Summary of the Invention

[0005] Based on this, and in view of the above-mentioned deficiencies in the prior art, a graphene-reinforced copper alloy rod and a preparation method thereof are proposed.

[0006] In order to achieve the above objectives, the following technical solutions are adopted: The present invention provides a method for preparing a graphene-reinforced copper alloy rod, comprising the following steps: S101, preparing a Cu-C master alloy rod; S102, passing the first copper strip through the graphite box so that the surface of the first copper strip is covered with a layer of graphene, and using a grinding wheel to thin and evenly coat the surface graphene; S103, winding the first copper strip processed in step S102 onto the Cu-C master alloy rod obtained in step S101, sealing the sides with welding, and covering both ends with copper material to obtain a first copper coil; S104: The copper coil obtained in step S103 is subjected to equal channel angular extrusion processing, and is repeatedly extruded and drawn to obtain a graphene-enhanced copper alloy rod.

[0007] In some embodiments, the preparation of the Cu-C master alloy rod in step S101 includes the following steps: S201, performing laser printing on the surface of the second copper strip to pre-form evenly distributed small holes; S202, the second copper strip is passed through the graphite box, so that the surface of the second copper strip is covered with a layer of graphene, and the surface layer of graphene is thinned and evenly coated by using a sanding wheel; S203, the second copper strip processed in step S202 is wound and side-seam welded, and the two ends are capped with copper material to obtain a second copper roll; S204, the second copper roll obtained in step S203 is subjected to equal-channel angular extrusion processing, and is repeatedly extruded and drawn to obtain a Cu-C master alloy rod.

[0008] In some embodiments, in steps S103 and S203, a copper pipe is inserted into the first copper roll and the second copper roll respectively, the internal air is completely extracted, and the copper pipe is flattened.

[0009] In some embodiments, the diameter of the copper pipe is smaller than the diameter of the first copper roll and the diameter of the second copper roll.

[0010] In some embodiments, the thickness of the graphene after the thinning and even coating treatment in step S102 is 1-10 μm, and the thickness of the graphene after the thinning and even coating treatment in step S202 is 1-10 μm.

[0011] In some embodiments, the graphite box is filled with multi-layer graphene structure of flaky graphite; when the second copper strip passes through the graphite box in step S202, the box is vibrated to cover the surface of the second copper strip with a layer of graphene; wherein the frequency of vibration is 20-100 HZ, and the pressure is 0.03 MPa-3 MPa; when the first copper strip passes through the graphite box in step S102, the box is vibrated and pressurized to cover the surface of the copper strip with a layer of graphene; wherein the frequency of vibration is 50-2000 Hz, and the pressure is 0.03 MPa-3 MPa.

[0012] In some embodiments, in step S104, after the first copper roll obtained in step S103 is kept at a temperature of 500-750℃ for 0.5-2h, the first copper roll obtained in step S103 is subjected to equal-channel angular extrusion processing, and is repeatedly extruded 2-3 times and drawn to obtain a graphene reinforced copper alloy rod.

[0013] In some embodiments, in step S204, after the second copper roll obtained in step S203 is kept at a temperature of 500-750℃ for 0.5-2h, the second copper roll obtained in step S203 is subjected to equal-channel angular extrusion processing, and is repeatedly extruded 5-10 times and drawn to obtain a Cu-C master alloy rod.

[0014] The application also provides a graphene reinforced copper alloy rod prepared by the preparation method described above.

[0015] In some embodiments, the graphene-enhanced copper alloy rod comprises the following components by mass percentage: C: 0.1%-0.5%, and the remainder is Cu.

[0016] The present invention has the following beneficial technical effects: The preparation method of the graphene-enhanced copper alloy rod of the present invention uses graphene copper (Cu-C master alloy) to place the core of a copper strip coil covered with graphene, and then performs vacuum sealing. The use of equal channel angular extrusion can make the graphene evenly distributed and simplify the process, improve efficiency, and achieve rapid mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a flow chart of a method for preparing a graphene-reinforced copper alloy rod according to the present invention; Figure 2 Schematic diagram of the preparation method of the Cu-C master alloy rod of the present invention; Figure 3 Schematic diagram of the preparation method of the graphene-reinforced copper alloy rod of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0020] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in the present invention, it is easy for those skilled in the art to appreciate that various modifications are feasible without actually departing from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, variations, and deletions may be made to the design, operating conditions, and parameters of the following exemplary embodiments.

[0021] The present invention needs to solve the problems of complex process, low efficiency, high cost and inability to quickly mass produce graphene in the copper matrix; and solve the problems of uneven distribution of graphene in the copper matrix, resulting in anisotropy and reduced performance.

[0022] Based on the above objectives, a first aspect of an embodiment of the present invention provides a method for preparing a graphene-reinforced copper alloy rod. Figure 1 A schematic flow chart of the method is shown. Figure 3 A schematic diagram of the method is shown.

[0023] The preparation method of the graphene reinforced copper alloy rod comprises the following steps: S101, preparing a Cu-C master alloy rod; S102, passing a first copper strip through a graphite box so that the surface of the first copper strip is covered with a layer of graphene, and using a sanding wheel to thin and evenly coat the surface layer of graphene; S103, winding the first copper strip treated in step S102 on the Cu-C master alloy rod obtained in step S101 and side-sealing, and using copper material to cover the two ends to obtain a first copper coil; S104, performing equal-channel-angle extrusion treatment on the first copper coil obtained in step S103, and repeatedly extruding and drawing to obtain a graphene reinforced copper alloy rod.

[0024] Specifically, in step S102, the first copper strip preferably uses a copper strip with a thickness of 0.05-0.5mm and a length of 1m. The diameter of the graphene reinforced copper alloy rod is 3-4mm.

[0025] In a preferred embodiment of the present application, Figure 2 A schematic diagram of preparing a Cu-C master alloy rod is shown. The preparation of the Cu-C master alloy rod in step S101 comprises the following steps: S201, laser printing on the surface of a second copper strip to preform small holes uniformly distributed; S202, passing the second copper strip through a graphite box so that the surface of the second copper strip is covered with a layer of graphene, and using a sanding wheel to thin and evenly coat the surface layer of graphene; S203, winding the second copper strip treated in step S202 and side-sealing, and using copper material to cover the two ends to obtain a second copper coil; S204, performing equal-channel-angle extrusion treatment on the second copper coil obtained in step S203, and repeatedly extruding and drawing to obtain a Cu-C master alloy rod.

[0026] Specifically, in step S202, the second copper strip preferably uses a copper strip with a thickness of 0.05-0.5mm and a length of 1m. The diameter of the Cu-C master alloy rod is 10mm.

[0027] In step S201, laser printing is performed on the surface of the second copper strip to pre-form evenly distributed small holes. These holes are then laser-printed onto the surface of the second copper strip. The hole depth is 50-100 μm, and the spacing between the holes is 1-2 mm. This process enhances the bonding between the graphene and the second copper strip through microstructural design and optimizes the uniformity of the subsequent coating process (the spacing between the holes is 1-2 mm, which provides good uniformity). The laser-printed holes form micron-scale depressions on the surface of the second copper strip. These depressions act as "anchor points," providing physical support for the mechanical engagement of the graphene layer. Laser drilling significantly increases the specific surface area of ​​the second copper strip. Laser treatment modifies the chemical activity and wettability of the second copper strip's surface. During the polishing process, the laser holes serve as dynamic control mechanisms: 1) slurry reservoirs: The holes temporarily store excess graphene slurry to prevent localized accumulation; and 2) thickness references: By controlling the hole depth (e.g., 50-100 μm), the minimum thickness of the graphene layer can be precisely defined, preventing coating failure due to excessive polishing.

[0028] In a preferred embodiment of the present invention, in step S103 and step S203, an exhaust copper tube is inserted into the first copper coil and the second copper coil respectively, and the internal air is completely exhausted and the exhaust copper tube is flattened. Figure 2-3 It can be seen that the copper strip will definitely enclose air during the winding process. Therefore, air is extracted by inserting an exhaust copper tube into the first copper coil and the second copper coil from one end face of each of the first copper coil and the second copper coil.

[0029] In a preferred embodiment of the present invention, the diameter of the exhaust copper tube is smaller than the diameter of the first copper coil obtained in step S103 and the diameter of the second copper coil obtained in step S203. Figure 2-3 As can be seen, the diameter of the exhaust copper tube is smaller than the diameter of the copper coil obtained in step S103 and the diameter of the copper coil obtained in step S203. Furthermore, the diameters of the exhaust copper tubes can correspond to the gaps formed between the first and second copper coils after winding. Each end face of the first and second copper coils can be connected to an exhaust copper tube.

[0030] In a preferred embodiment of the present invention, the thickness of the graphene after the thinning and leveling treatment in step S102 and step S202 is 1-10 μm.

[0031] Specifically, the parameters of the grinding wheel for thinning and evenly coating the surface graphene are a grinding wheel speed of 10-100 rpm.

[0032] In a preferred embodiment of the present invention, the graphite box is filled with flake graphite with a multi-layer graphene structure; when the second copper strip passes through the graphite box in step S202, the box is vibrated so that the surface of the second copper strip is covered with a layer of graphene; wherein the vibration frequency is 20~100HZ and the pressure is 0.03MPa~3MPa; when the first copper strip passes through the graphite box in step S102, the box is vibrated and pressurized so that the surface of the first copper strip is covered with a layer of graphene; wherein the vibration frequency is 50~2000Hz and the pressure is 0.03MPa~3MPa.

[0033] Flake graphite (purity >99.5%) is a natural multilayer graphene structure. Under high-frequency vibration, friction and pressure conditions, it peels off along the weak surface into a single layer or thinned multilayer graphene. One of the surfaces and the copper-based surface undergoes van der Waals force physical composite layer under the action of pressure and friction. After high-frequency separation and thinning, a single layer or N (<10) layer graphene and copper composite layer is obtained.

[0034] Flake graphite can be considered a naturally occurring multilayer graphene material, but its structure differs somewhat from artificially prepared few-layer graphene (e.g., 1-10 layers). The following is a detailed analysis: 1. Structure of flake graphite Multi-layer graphene stacking: Flake graphite is composed of hundreds to thousands of layers of graphene stacked by van der Waals forces. Each layer of graphene is a single-atom-thick carbon hexagonal ring structure (the same as a single layer of graphene).

[0035] Naturally formed: It is a form of natural graphite (other forms include amorphous graphite and massive graphite), usually found in metamorphic rocks, formed through geological processes of high temperature and pressure.

[0036] 2. Relationship with graphene In a broad sense, flake graphite can be called "multilayer graphene" because its basic unit is the graphene layer. However, strictly speaking, graphene usually refers to thin layers of material with less than 10 layers (international standards generally classify more than 10 layers as graphite).

[0037] Key differences: Number of layers: The number of layers of flake graphite is much greater than that of artificially exfoliated few-layer graphene.

[0038] Performance: Few-layer graphene (especially single-layer) has unique electrical, optical and mechanical properties (such as high conductivity and quantum effects), while flake graphite is closer to the properties of bulk graphite.

[0039] 3. Raw materials for preparing graphene: Flake graphite can be reduced in number of layers through chemical exfoliation (such as Hummers method for preparing graphene oxide), mechanical exfoliation or electrochemical methods to obtain few-layer / single-layer graphene.

[0040] In a preferred embodiment of the present invention, in step S104, after the first copper coil obtained in step S103 is kept warm at a temperature of 500-750°C for 0.5-2h, the first copper coil obtained in step S103 is subjected to equal channel angular extrusion treatment, repeatedly extruded 2-3 times and drawn to obtain a graphene-enhanced copper alloy rod.

[0041] In step S204, the second copper coil obtained in step S203 is kept at a temperature of 500-750° C. for 0.5-2 hours, and then subjected to equal channel angular extrusion treatment, repeatedly extruded 5-10 times and drawn to obtain a Cu-C master alloy rod.

[0042] Equal Channel Angular Pressing (ECAP) is a processing technology that refines the grain size of metal materials and improves their properties through intense plastic deformation.

[0043] The core device of equal channel angular extrusion, the die, consists of two equal-section channels intersecting with each other. The angle between the channels is φ (usually 90°~120°), and the outer arc angle at the intersection of the two channels is ψ. The die design ensures that the cross-sectional dimensions of the material remain unchanged after passing through, and can be extruded repeatedly. Deformation mechanism: The blank enters from the inlet channel under the pressure of the punch. When it passes through the intersection of the channels, pure shear deformation (no stretching or compression) occurs due to the change in direction, and a large amount of strain accumulates inside the material. The strain can be accumulated through multiple extrusions (such as reciprocating extrusion, cycles of different paths), so that the grains are continuously refined to the micron or even nanometer level. Figure 2-3 As shown, in this embodiment, the channel angle is 90°, and the copper coil is subjected to equal channel angular extrusion to obtain a plate-like component. After multiple extrusions, the grain size of materials such as copper alloys can be refined from the millimeter level to below 1μm, forming a uniform ultrafine grain structure. Improved physical and chemical properties. The refined grains reduce internal defects in the material, and the electrical and thermal conductivity are basically maintained. Microstructure optimization: The original coarse grain structure is transformed into uniform equiaxed ultrafine grains, the number of grain boundaries is greatly increased, the anisotropy of the material is reduced, and the performance is more stable.

[0044] It should be understood that the first and second of the present invention are only used for illustration and are not intended to limit the importance of the corresponding terms. In addition, for example, the first copper strip and the second copper strip can be derived from different parts of the same copper strip, or from different copper strips.

[0045] A second aspect of the present invention provides a graphene-enhanced copper alloy rod. The graphene-enhanced copper alloy rod comprises the following components by mass: C: 0.1%-0.5%, with the remainder being Cu.

[0046] In an embodiment of the present invention, a graphene-enhanced copper strip (Cu-C master alloy) is placed into the core of the second copper coil, followed by vacuum sealing. Equal channel angular pressing (ECAP) is used to evenly distribute the graphene and simplify the process, improving efficiency and enabling rapid mass production at low cost, effectively resolving existing technical problems. Therefore, a method in which the graphene on the surface of a copper strip is thinned and evenly coated using a grinding wheel, then wound around a Cu-C master alloy and vacuum sealed. ECAP followed by drawing produces a graphene-enhanced copper rod. This method ensures uniform graphene distribution while achieving a relative conductivity of 110-120% IACS, improving production efficiency and enabling mass production.

[0047] The advantages of the method for preparing the graphene-enhanced copper alloy rod according to the embodiment of the present invention are: (1) Short production process and high efficiency Aiming at the requirement of adding graphene to a copper matrix to improve its mechanical properties, the present invention is different from the powder preparation, sintering, deposition and post-processing steps of powder metallurgy and electrochemical deposition. A copper strip is passed through a graphite box to be covered with graphene, and then thinned by a grinding wheel. The copper strip is directly wound on a Cu-C master alloy for ECAP and drawing to produce a graphene copper rod. This shortens the preparation process, reduces production costs and improves production efficiency.

[0048] (2) Using grinding wheel, Cu-C master alloy and ECAP to make graphene evenly distributed A grinding wheel is used to thin the copper strip to make the graphene evenly distributed on it, and a Cu-C master alloy is prepared by increasing the number of ECAP passes. The copper strip is wound on it and subjected to a few more ECAP passes to make the graphene further uniform. Finally, graphene copper rods are obtained by drawing.

[0049] The present invention is further illustrated by the following examples.

[0050] Relative conductivity refers to the ratio of a material's conductivity to that of a standard reference material, expressed as a percentage (% IACS). The internationally accepted benchmark is the conductivity of annealed pure copper (99.98% purity) at 20°C, with 100% IACS (International Annealed Copper Standard) being the standard. In practical applications, a high % IACS value indicates improved electron transfer efficiency and conductivity, which is crucial for applications requiring high-quality, highly conductive metals. Therefore, when selecting alloys, materials with higher % IACS values ​​are generally preferred.

[0051] Example 1 1. Preparation of Cu-C Master Alloy Rods (1) Laser printing Laser printing is performed on the surface of a 0.1mm thick and 1m long copper strip to pre-produce evenly distributed small holes.

[0052] (2) Grinding wheel thinning The copper strip is passed through a graphite box, which is vibrated at a frequency of 60HZ and a pressure of 0.3MPa, so that the surface of the copper strip is covered with a layer of graphene. The surface graphene is thinned and evenly spread using a grinding wheel to reach 10μm.

[0053] (3) Winding and vacuum sealing The copper strip was rolled up and welded on the sides, and both ends were covered with copper. A copper tube with a diameter of 10 mm and a length of 5 cm was inserted into one end, and all the internal air was extracted and the copper tube was flattened.

[0054] (4) Equal channel angular extrusion and drawing After being kept at 750° C. for 2 hours, the alloy was subjected to equal channel angular extrusion treatment, repeatedly extruded 10 times, and drawn to obtain a Cu-C master alloy rod with a diameter of 10 mm.

[0055] 2. Preparation of Graphene Copper Rods (1) Grinding wheel thinning A copper strip with a thickness of 0.1 mm and a length of 1 m is passed through a graphite box, which is subjected to 80 Hz vibration and 0.5 MPa pressure to cover the surface of the copper strip with a layer of graphene. The surface graphene is then thinned and evenly coated using a grinding wheel to reach a thickness of 10 μm.

[0056] (2) Winding and vacuum sealing The above copper strip is wound on the Cu-C master alloy and sealed on the side. Both ends are covered with copper material. A copper tube with a diameter of 10 mm and a length of 5 cm is connected to one end. All the internal air is extracted and the copper tube is flattened.

[0057] (3) Equal channel angular extrusion and drawing After being kept at 750°C for 2 hours, it was subjected to equal channel angular extrusion treatment, repeatedly extruded three times and drawn to obtain a graphene-reinforced copper alloy rod with a diameter of 3 mm.

[0058] Example 2 1. Preparation of Cu-C Master Alloy Rods (1) Laser printing Laser printing is performed on the surface of a 0.3mm thick and 1m long copper strip to pre-produce evenly distributed small holes.

[0059] (2) Grinding wheel thinning The copper strip is passed through a graphite box, which is vibrated at a frequency of 45HZ and a pressure of 0.3MPa, so that the surface of the copper strip is covered with a layer of graphene. The surface graphene is thinned and evenly spread using a grinding wheel to reach 5μm.

[0060] (3) Winding and vacuum sealing The copper strip was rolled up and welded on the sides, and both ends were covered with copper. A copper tube with a diameter of 10 mm and a length of 5 cm was inserted into one end, and all the internal air was extracted and the copper tube was flattened.

[0061] (4) Equal channel angular extrusion and drawing After being kept at 600° C. for 1 hour, the alloy was subjected to equal channel angular extrusion, repeatedly extruded 7 times and drawn to obtain a Cu-C master alloy rod with a diameter of 10 mm.

[0062] 2. Preparation of Graphene Copper Rods (1) Grinding wheel thinning A copper strip with a thickness of 0.3 mm and a length of 1 m is passed through a graphite box, which is subjected to 80 Hz vibration and 0.5 MPa pressure to cover the surface of the copper strip with a layer of graphene. The surface graphene is then thinned and evenly coated using a grinding wheel to reach a thickness of 5 μm.

[0063] (2) Winding and vacuum sealing The above copper strip is wound on the Cu-C master alloy and sealed on the side. Both ends are covered with copper material. A copper tube with a diameter of 10 mm and a length of 5 cm is connected to one end. All the internal air is extracted and the copper tube is flattened.

[0064] (3) Equal channel angular extrusion and drawing After being kept at 600°C for 1 hour, it was subjected to equal channel angular extrusion treatment, repeatedly extruded twice and drawn to obtain a graphene-reinforced copper alloy rod with a diameter of 3.5 mm.

[0065] Example 3 1. Preparation of Cu-C master alloy rod (1) Laser printing Laser printing is performed on the surface of a 0.5mm thick and 1m long copper strip to pre-produce evenly distributed small holes.

[0066] (2) Grinding wheel thinning The copper strip is passed through a graphite box, which is vibrated at a frequency of 30HZ and a pressure of 0.3MPa, so that the surface of the copper strip is covered with a layer of graphene. The surface graphene is thinned and evenly spread using a grinding wheel to reach 1μm.

[0067] (3) Winding and vacuum sealing The copper strip was rolled up and welded on the sides, and both ends were covered with copper. A copper tube with a diameter of 10 mm and a length of 5 cm was inserted into one end, and all the internal air was extracted and the copper tube was flattened.

[0068] (4) Equal channel angular extrusion and drawing After being kept at a temperature of 500° C. for 0.5 h, the alloy was subjected to equal channel angular extrusion treatment, and the extrusion was repeated 5 times and then drawn to obtain a Cu-C master alloy rod with a diameter of 10 mm.

[0069] 2. Preparation of Graphene Copper Rods (1) Grinding wheel thinning A 0.5mm thick and 1m long copper strip is passed through a graphite box, which is subjected to 80HZ vibration and 0.5MPa pressure to cover the surface of the copper strip with a layer of graphene. The surface graphene is thinned and evenly spread using a grinding wheel to reach 1μm.

[0070] (2) Winding and vacuum sealing The above copper strip is wound on the Cu-C master alloy and sealed on the side. Both ends are covered with copper material. A copper tube with a diameter of 10 mm and a length of 5 cm is connected to one end. All the internal air is extracted and the copper tube is flattened.

[0071] (3) Equal channel angular extrusion and drawing After keeping it at a temperature of 500°C for 0.5h, it was subjected to equal channel angular extrusion treatment, repeatedly extruded once and drawn to obtain a graphene-reinforced copper alloy rod with a diameter of 4mm.

[0072] Table 1. Composition and properties of graphene-enhanced copper alloy rods of Examples 1-3

[0073] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. Although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as plural unless expressly limited to the singular.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the disclosure of the present invention (including the claims) to these examples. Within the spirit of the present invention, the technical features of the above embodiments or different embodiments may be combined, and many other variations exist in different aspects of the above embodiments, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a graphene-reinforced copper alloy rod, characterized in that: The following steps are involved: S101, preparing a Cu-C master alloy rod; S102, passing the first copper strip through the graphite box so that the surface of the first copper strip is covered with a layer of graphene, and using a grinding wheel to thin and evenly coat the surface graphene; S103, winding the first copper strip processed in step S102 onto the Cu-C master alloy rod obtained in step S101, sealing the sides with welding, and covering both ends with copper material to obtain a first copper coil; S104: The first copper coil obtained in step S103 is subjected to equal channel angular extrusion processing, and is repeatedly extruded and drawn to obtain a graphene-enhanced copper alloy rod.

2. The method for preparing the graphene-enhanced copper alloy rod according to claim 1, wherein: The preparation of the Cu-C master alloy rod in step S101 includes the following steps: S201, performing laser printing on the surface of the second copper strip to pre-form evenly distributed small holes; S202, passing the second copper strip through the graphite box so that the surface of the second copper strip is covered with a layer of graphene, and using a grinding wheel to thin and evenly coat the surface graphene; S203, rolling up the second copper strip processed in step S202, sealing and welding the sides, and covering both ends with copper material to obtain a second copper coil; S204 , subjecting the second copper coil obtained in step S203 to equal channel angular extrusion, repeatedly extruding and drawing to obtain a Cu—C master alloy rod.

3. The method for preparing the graphene-enhanced copper alloy rod according to claim 2, wherein: In step S103 and step S203, exhaust copper tubes are inserted into the first copper coil and the second copper coil respectively, and all the internal air is extracted and the exhaust copper tubes are flattened.

4. The method for preparing the graphene-enhanced copper alloy rod according to claim 3, wherein: The diameter of the exhaust copper tube is smaller than the diameter of the first copper coil and the diameter of the second copper coil.

5. The method for preparing the graphene-enhanced copper alloy rod according to claim 2, wherein: The thickness of the graphene after the thinning and leveling treatment in step S102 is 1-10 μm and the thickness of the graphene after the thinning and leveling treatment in step S202 is 1-10 μm.

6. The method for preparing the graphene-enhanced copper alloy rod according to claim 2, wherein: The graphite box is filled with flake graphite with a multi-layer graphene structure; when the second copper strip passes through the graphite box in step S202, the box is vibrated so that the surface of the second copper strip is covered with a layer of graphene; wherein the vibration frequency is 20~100HZ and the pressure is 0.03MPa~3MPa; when the first copper strip passes through the graphite box in step S102, the box is vibrated and pressurized so that the surface of the copper strip is covered with a layer of graphene; wherein the vibration frequency is 50~2000Hz and the pressure is 0.03MPa~3MPa.

7. The method for preparing the graphene-enhanced copper alloy rod according to claim 1, wherein: In step S104, the first copper coil obtained in step S103 is kept warm at a temperature of 500-750° C. for 0.5-2 hours, and then the first copper coil obtained in step S103 is subjected to equal channel angular extrusion, repeatedly extruded 2-3 times and drawn to obtain a graphene-enhanced copper alloy rod.

8. The method for preparing the graphene-enhanced copper alloy rod according to claim 2, wherein: In step S204, the second copper coil obtained in step S203 is kept at a temperature of 500-750° C. for 0.5-2 hours, and then subjected to equal channel angular extrusion treatment, repeatedly extruded 5-10 times and drawn to obtain a Cu-C master alloy rod.

9. A graphene-enhanced copper alloy rod, characterized in that: The preparation is carried out by the preparation method according to any one of claims 1 to 8.

10. The graphene-enhanced copper alloy rod according to claim 9, characterized in that: The graphene-enhanced copper alloy rod comprises the following components by mass percentage: C: 0.1%-0.5%, and the rest is Cu.

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