High-conductivity graphene copper wire and preparation method thereof

Abstract

The invention discloses a high-conductivity graphene copper wire and a preparation method thereof, relates to the technical field of composite material application, and aims to solve the problems of how to produce in batches and breaking a graphene copper interface in the preparation process of the graphene copper wire. Graphene powder and copper powder are mixed, and graphene and copper mixed powder is obtained; s2, the graphene and copper mixed powder in the step S1 is loaded into a copper pipe, welding sealing is conducted after sealing is conducted, and a graphene copper rod is obtained; and S3, the graphene copper rod in the step S2 is subjected to hot rolling, linear cutting and drawing, and then the high-conductivity graphene copper wire is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of composite material application, and in particular to a high-conductivity graphene copper wire and a preparation method thereof. Background Art

[0002] Pure metals have long been considered to have the highest conductivity at room temperature. Since the first official record of the conductivity of copper about 100 years ago, a large number of studies on highly refined copper metal have only increased the conductivity by about 3%. The widely used International Annealed Copper Standard (IACS) records the conductivity of pure copper at room temperature as 5.8×10 7 S / m, among metals, only silver has a better conductivity than copper (about 108% IACS), but its cost is too high, so copper-based materials have always served as the main conductive material.

[0003] In order to improve the conductivity of copper-based materials, the method of preparing high-purity copper by increasing purity, reducing grain boundaries and reducing defects has gradually approached the physical limit, the cost has increased significantly, and the technical requirements have become more and more stringent. The addition of other alloy materials (such as tin, rare earth elements, etc.) also often causes the conductivity to decrease due to process instability or copper-based lattice distortion, and there are certain limitations. The use of metallic copper and new materials to prepare ultra-high conductive copper-based composite materials has attracted extensive research.

[0004] Graphene is an allotrope of carbon atoms and a two-dimensional crystalline material. It is the basic single-layer SP of a two-dimensional lattice component. 2 Hybrid (two-dimensional honeycomb structure) carbon atoms. In 2004, British scientists successfully prepared graphene sheets for the first time. The carbon atoms inside the graphene sheets are bonded by σ bonds with extremely high bonding strength, and each carbon atom can provide an unbonded free electron. This unique structure determines its high strength and good conductivity. Its strength is as high as 130GPa, and its carrier mobility is 15000cm 2 / (V·s), both of which are the highest among currently known materials. In addition, graphene also has a very high surface area and thermal conductivity, as well as unique properties such as molecular, quantum, and tunneling effects. Due to its special two-dimensional structure and excellent performance, graphene still has good advantages in improving the mechanical properties of materials and maintaining the high electrical and thermal conductivity of copper, making it an excellent reinforcement material for copper-based composite materials. Graphene-enhanced copper-based materials have been used in the automotive and aerospace industries.

[0005] However, the process of preparing wires from graphene copper composite materials is relatively lacking. In the process of preparing graphene copper wires from graphene copper composite materials, the interface structure of graphene copper is often destroyed, resulting in the conductivity of the prepared graphene copper wire being much lower than that of the graphene copper composite materials. Therefore, the problems of how to mass produce graphene copper wires and the breakage of the graphene copper interface need to be solved urgently. Summary of the invention

[0006] The present invention proposes a method comprising the following steps: S1: mixing the graphene powder and the copper powder to obtain a graphene-copper mixed powder; S2: putting the graphene copper mixed powder in step S1 into a copper tube, sealing it with a cap and welding it to obtain a graphene copper rod; S3: The graphene copper rod in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0007] The present invention is further configured as follows: the mass percentage of the graphene powder in step S1 is 0.001-1wt%, and the remainder is the copper powder.

[0008] The present invention is further configured as follows: the copper powder used in step S1 has a particle size of 15-100 μm.

[0009] The present invention is further configured as follows: the outer thickness of the copper tube in step S2 is 1-20 mm, and the copper tube is a single crystal copper tube or an oxygen-free copper tube.

[0010] The present invention is further configured as follows: the hot rolling temperature in step S3 is 600-1000°C, the material is kept warm for 10 minutes before each rolling, and is immediately sent to the hot rolling mill for rolling after the insulation is completed. The hot rolling speed is 0.1-2m / s, and the final thickness after rolling is 20-50% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0011] The present invention is further configured as follows: the specific steps of the wire cutting described in step S3 are: inputting the processing program into the controller, and starting the wire feeding and water pump, adjusting the water spraying amount, and then turning on the power supply, and selecting the adaptation parameters; the hot-rolled graphene copper plate is completely cut off on the substrate to obtain a graphene copper strip.

[0012] The present invention is further configured as follows: the graphene copper strip is used as a raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, until a high-conductivity graphene copper wire of a desired diameter is drawn.

[0013] The present invention also provides a high-conductivity graphene copper wire, which is prepared by the preparation method as described above.

[0014] The beneficial effects of the present invention are:

[0015] 1. The preparation method of the highly conductive graphene copper wire disclosed in the present invention can realize integrated batch production. The process sequence is more reasonable, which greatly improves the production efficiency and reduces the production cost.

[0016] 2. The high-conductivity graphene copper wire disclosed in the present invention has high conductivity, and its conductivity can reach 95-110% IACS. According to the national standard for electrical round copper wire "GB / T3953-2024", the conductivity of traditional TY wires is required to be greater than 96% IACS, and the conductivity of TR wires is required to be greater than 100.9% IACS. It has good application prospects in the fields of aviation and electronics industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of the present invention is shown. DETAILED DESCRIPTION

[0018] Those skilled in the art can refer to the content of this article and appropriately improve the process parameters. It is particularly important to point out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0019] Example 1

[0020] The present invention provides a method for preparing a highly conductive graphene copper wire, comprising the following steps: S1: mixing the graphene powder and the copper powder to obtain a graphene-copper mixed powder; S2: Put the graphene copper mixed powder in step S1 into a copper tube, seal the tube and weld it to obtain a graphene copper rod. S3: The graphene copper rod in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0021] The mass percentage of the graphene powder in step S1 is 0.001-1wt%, and the remainder is copper powder, and the particle size of the copper powder is 15-100 μm.

[0022] The outer diameter of the copper tube in step S2 is 1-20 mm, and the copper tube is a single crystal copper tube or an oxygen-free copper tube.

[0023] The hot rolling temperature in step S3 is 600-1000°C, and the temperature is kept for 10 minutes before each rolling. After the temperature is kept, the hot rolling mill is immediately put into rolling. The hot rolling speed is 0.1-2m / s. The final thickness of the graphene copper rod after rolling is 20-50% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0024] The specific steps of wire cutting are: input the processing program into the controller of the cutting device, start the wire feeding and water pump, adjust the water spray volume, then turn on the power supply and select the adaptation parameters; cut the hot-rolled graphene copper plate completely on the substrate to obtain graphene copper strips.

[0025] The graphene copper strip is used as a raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, until a high-conductivity graphene copper wire of a desired diameter is drawn.

[0026] Example 2

[0027] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0028] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.001wt%.

[0029] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0030] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0031] The hot rolling temperature is 900°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 20% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0032] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0033] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.8 mm is drawn.

[0034] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 101.5% IACS.

[0035] Example 3

[0036] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0037] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.1wt%.

[0038] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 1 mm and a thickness of 0.5 mm.

[0039] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0040] The hot rolling temperature is 900°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 50% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0041] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0042] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0043] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 95.2% IACS.

[0044] Example 4

[0045] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0046] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.001wt%.

[0047] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 20 mm and a thickness of 0.5 mm.

[0048] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0049] The hot rolling temperature is 950°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0050] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0051] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 1 mm is drawn.

[0052] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 106.4% IACS.

[0053] Example 5

[0054] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0055] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0056] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0057] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0058] The hot rolling temperature is 600°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.9m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0059] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0060] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0061] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 101.2% IACS.

[0062] Example 6

[0063] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0064] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0065] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0066] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0067] The hot rolling temperature is 1000°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0068] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0069] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0070] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 103.5% IACS.

[0071] Example 7

[0072] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0073] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0074] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 20 mm and a thickness of 0.5 mm.

[0075] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0076] The hot rolling temperature is 900°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0077] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0078] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 1 mm is drawn.

[0079] The high conductive graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 104.2% IACS.

[0080] Example 8

[0081] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0082] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0083] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0084] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0085] The hot rolling temperature is 900°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0086] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0087] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0088] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 107.5% IACS.

[0089] Example 9

[0090] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0091] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0092] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0093] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0094] The hot rolling temperature is 800°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.5m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0095] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0096] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0097] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 104.3% IACS.

[0098] Example 10

[0099] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0100] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0101] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0102] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0103] The hot rolling temperature is 1000°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.1m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0104] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0105] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0106] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 102.6% IACS.

[0107] Embodiment 11

[0108] This embodiment adopts the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wire, wherein graphene powder and copper powder are purchased items, and the specific preparation process is as follows:

[0109] S1: preparing ingredients, preparing graphene copper mixed powder, adding graphene powder into copper powder with a purity of 99.999%, and mechanically stirring to mix the graphene powder and the copper powder; wherein the mass percentage of the graphene powder is 0.01wt%.

[0110] S2: The graphene copper mixed powder prepared in step S1 is loaded into a single crystal copper tube, and its opening is welded and sealed with a cover to obtain a graphene copper rod; wherein the single crystal copper tube has a diameter of 10 mm and a thickness of 0.5 mm.

[0111] S3: The graphene copper rod obtained in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

[0112] The hot rolling temperature is 1000°C, and the material is kept warm for 10 minutes before each rolling. After the heat preservation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 2m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

[0113] The hot-rolled graphene copper sheet is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip.

[0114] The graphene copper strip is used as the raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, and a highly conductive graphene copper wire with a diameter of 0.5 mm is drawn.

[0115] The high-conductivity graphene copper conductor prepared in step S3 was tested for its conductivity according to the four-probe method, and its conductivity was measured to be 99.6% IACS.

[0116] The specific parameters of Examples 2-11 are described in Table 1: Table 1. Experimental parameters of the method of Example 1

[0117] Example 12

[0118] This embodiment discloses a highly conductive graphene copper wire, which is prepared by the preparation method described in Example 1.

[0119] In summary, the preparation method of the high-conductivity graphene copper wire disclosed in the present invention can realize integrated batch production. The process sequence is more reasonable, which greatly improves the production efficiency and reduces the production cost. The high-conductivity graphene copper wire disclosed in the present invention has high conductivity, and its conductivity can reach 95-110% IACS. According to the national standard for electrical round copper wire "GB / T 3953-2024", the conductivity of traditional TY wire is required to be greater than 96% IACS, and the conductivity of TR wire is required to be greater than 100.9% IACS. It has good application prospects in the fields of aviation aircraft and electronics industry.

[0120] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be within the scope of protection of the present invention.

Claims

1. A method for preparing a highly conductive graphene copper wire, characterized in that: The following steps are included: S1: mixing the graphene powder and the copper powder to obtain a graphene-copper mixed powder; S2: putting the graphene copper mixed powder in step S1 into a copper tube, sealing it with a cap and welding it to obtain a graphene copper rod; S3: The graphene copper rod in step S2 is subjected to hot rolling, wire cutting and drawing to obtain a highly conductive graphene copper wire.

2. The method for preparing a highly conductive graphene copper wire according to claim 1, characterized in that: The mass percentage of the graphene powder in step S1 is 0.001-1wt%, and the remainder is the copper powder.

3. The method for preparing a highly conductive graphene copper wire according to claim 1, characterized in that: The copper powder used in step S1 has a particle size of 15-100 μm.

4. The method for preparing a highly conductive graphene copper wire according to claim 1, characterized in that: The outer diameter of the copper tube in step S2 is 1-20 mm, and the copper tube is a single crystal copper tube or an oxygen-free copper tube.

5. The method for preparing a highly conductive graphene copper wire according to claim 1, characterized in that: The hot rolling temperature in step S3 is 600-1000°C, and the sheet is kept warm for 10 minutes before each rolling. After the insulation, it is immediately sent to the hot rolling mill for rolling. The hot rolling speed is 0.1-2m / s. The final thickness after rolling is 20-50% of the original thickness. Each rolling pass is 0.5mm, and finally a hot-rolled graphene copper plate is obtained.

6. The method for preparing a highly conductive graphene copper wire according to claim 5, characterized in that: The specific steps of the wire cutting described in step S3 are: inputting the processing program into the controller, turning on the wire feeding and water pump, adjusting the water spraying amount, then turning on the power supply, and selecting the adaptation parameters; completely cutting the hot-rolled graphene copper plate on the substrate to obtain a graphene copper strip.

7. The method for preparing a highly conductive graphene copper wire according to claim 6, characterized in that: The graphene copper strip is used as a raw material and subjected to multiple drawing processes, and the deformation rate of each drawing process is 1%, until a high-conductivity graphene copper wire with a desired diameter is drawn.

8. A highly conductive graphene copper wire, characterized in that: The method is prepared according to any one of claims 1 to 7.

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