Highly conductive graphene copper wire and its preparation method

Abstract

This invention discloses a high-conductivity graphene copper wire and its preparation method, relating to the technical field of composite material applications. The invention aims to solve the problems of mass production and graphene-copper interface breakage during the preparation of graphene copper wires. The invention includes the following steps: S1: Batching, mixing graphene powder and copper powder to obtain a graphene-copper mixed powder; S2: Loading the graphene-copper mixed powder from step S1 into a copper inlet tube, sealing it, and welding it to obtain a graphene copper rod; S3: Preparing the graphene copper rod from step S2 through hot rolling, wire cutting, and drawing to obtain a high-conductivity graphene copper wire.

Description

Technical Field

[0001] This invention relates to the technical field of composite material applications, specifically to a highly conductive graphene copper wire and its preparation method. Background Technology

[0002] Pure metals have long been considered to have the highest electrical conductivity at room temperature. Since the electrical conductivity of copper was first formally recorded about 100 years ago, extensive research on highly refined copper has only increased its conductivity by about 3%. The widely adopted International Standard for Annealed Copper (IACS) records the electrical conductivity of pure copper at room temperature as 5.8 × 10⁻⁶. 7 In terms of conductivity (S / m), only silver has a higher conductivity than copper (approximately 108% IACS), but its cost is too high. Therefore, copper-based materials have always been the main conductive materials.

[0003] To improve the conductivity of copper-based materials, methods for preparing high-purity copper by increasing purity, reducing grain boundaries, and minimizing defects have gradually approached their physical limits, resulting in significantly increased costs and increasingly stringent technical requirements. Adding other alloying materials (such as tin and rare earth elements) often leads to decreased conductivity due to unstable processes or copper-based lattice distortion, presenting certain limitations. Therefore, the preparation of ultra-high conductivity copper-based composite materials by combining metallic copper with new materials has attracted extensive research.

[0004] Graphene is an allotrope of carbon atoms and a two-dimensional crystalline material. It is the basic monolayer spline for two-dimensional lattice components. 2 Hybridized (two-dimensional honeycomb structure) carbon atoms. In 2004, British scientists successfully prepared graphene sheets for the first time, in which the carbon atoms are all bonded by extremely strong σ bonds, and each carbon atom can also provide an unbonded free electron. This unique structure determines its high strength and good electrical conductivity, with a strength of up to 130 GPa and a carrier mobility of 15000 cm⁻¹. 2 / (V·s), both of which are the highest known values ​​for materials. Furthermore, graphene also possesses 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 significant advantages in improving the mechanical properties of materials and maintaining the high electrical and thermal conductivity of copper, making it an excellent reinforcing material for copper-based composites. Graphene-reinforced copper-based materials have already been applied in the automotive and aerospace industries.

[0005] However, the technology for fabricating graphene-copper composite wires is relatively lacking. During the fabrication process, the interfacial structure of graphene and copper is often damaged, resulting in the conductivity of the fabricated graphene-copper wires being significantly lower than that of the graphene-copper composite material. Therefore, solutions to the problems of mass production and graphene-copper interface breakage in the fabrication of graphene-copper wires are urgently needed. Summary of the Invention

[0006] This invention proposes a method comprising the following steps:

[0007] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure uniform mixing; wherein the mass percentage of graphene powder is 0.01 wt%.

[0008] S2: The graphene copper powder prepared in step S1 is loaded into a single crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene copper rod; wherein the diameter of the single crystal copper tube is 10mm and the thickness is 0.5mm.

[0009] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a high-conductivity graphene copper wire. The hot rolling temperature is 900℃, and the rod is held at the temperature for 10 minutes before each rolling pass. After the holding period, the rod is immediately fed into the hot rolling mill for rolling at a speed of 0.5 m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5 mm thick, resulting in a hot-rolled graphene copper plate. The hot-rolled graphene copper plate is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip. The graphene copper strip is used as raw material and subjected to multiple drawing processes, with a deformation rate of 1% per drawing pass, to obtain a high-conductivity graphene copper wire with a diameter of 0.5 mm.

[0010] A further provision of the present invention is that the graphene powder in step S1 has a mass percentage of 0.01 wt%, with the remainder being the copper powder.

[0011] A further feature of the present invention is that the copper powder used in step S1 has a particle size of 15-100 μm.

[0012] A further feature of the present invention is that the outer diameter of the copper tube in step S2 is 1-20 mm, and the copper tube is selected as a single crystal copper tube or an oxygen-free copper tube.

[0013] The present invention is further configured such that: the hot rolling temperature in step S3 is 600-1000℃, the temperature is held for 10 minutes before each rolling pass, and the hot rolling is immediately fed into the hot rolling mill after the holding period is completed. The hot rolling speed is 0.1-2m / s, the final thickness after rolling is 20-50% of the original thickness, and the rolling is 0.5mm per pass, thus obtaining the hot-rolled graphene copper plate.

[0014] A further provision of the present invention is as follows: the specific steps of wire cutting in step S3 are as follows: input the processing program into the controller, turn on the wire feeding and water pump, adjust the water spray volume, then turn on the power supply and select the matching parameters; cut the hot-rolled graphene copper plate completely off the substrate to obtain graphene copper strip.

[0015] A further provision of the present invention is that the graphene copper strip is used as raw material and subjected to multiple drawing processes, with a deformation rate of 1% for each drawing process, until a high-conductivity graphene copper wire of the required diameter is drawn.

[0016] The present invention also proposes a highly conductive graphene copper wire, which is prepared by the preparation method described above.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The method for preparing highly conductive graphene copper wires disclosed in this invention enables integrated mass production. The process sequence is more rational, greatly improving production efficiency and reducing production costs.

[0019] 2. The high-conductivity graphene copper wire disclosed in this invention exhibits high conductivity, reaching 95-110% IACS. According to the national standard for electrical round copper wire, GB / T 3953-2024, the conductivity requirement for traditional TY wire is greater than 96% IACS, and for TR wire, it is greater than 100.9% IACS. It shows promising application prospects in the fields of aerospace and electronics industries. Attached Figure Description

[0020] Figure 1 A flowchart of the present invention is shown. Detailed Implementation

[0021] Those skilled in the art can refer to the content of this document and appropriately improve the process parameters to achieve the desired results. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can make modifications or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention.

[0022] Example 1

[0023] This invention proposes a method for preparing highly conductive graphene copper wires, comprising the following steps:

[0024] S1: Ingredients: Mix graphene powder and copper powder to obtain graphene-copper mixed powder;

[0025] S2: The graphene-copper mixed powder from step S1 is loaded into a copper inlet tube, sealed by welding, to obtain a graphene-copper rod.

[0026] S3: The graphene copper rod described in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0027] In step S1, the graphene powder has a mass percentage of 0.001-1 wt%, with the remainder being copper powder, and the copper powder has a particle size of 15-100 μm.

[0028] In step S2, the outer diameter of the copper tube is 1-20mm, and the copper tube is selected as either single crystal copper tube or oxygen-free copper tube.

[0029] In step S3, the hot rolling temperature is 600-1000℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into the hot rolling mill for 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, the hot-rolled graphene copper plate is obtained.

[0030] The specific steps of wire cutting are as follows: input the processing program into the controller of the cutting device, turn on the wire feeding and water pump, adjust the water spray volume, then connect the power supply and select the appropriate parameters; cut the hot-rolled graphene copper plate completely off the substrate to obtain graphene copper strips.

[0031] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% for each drawing process, until the desired high-conductivity graphene copper wire is drawn.

[0032] Example 2

[0033] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0034] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.001wt%.

[0035] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0036] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0037] The hot rolling temperature is 900℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0038] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0039] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.8 mm.

[0040] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 101.5% IACS.

[0041] Example 3

[0042] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0043] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.1wt%.

[0044] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 1 mm and the thickness is 0.5 mm.

[0045] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0046] The hot rolling temperature is 900℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0047] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0048] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0049] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 95.2% IACS.

[0050] Example 4

[0051] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0052] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.001wt%.

[0053] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 20mm and the thickness is 0.5mm.

[0054] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0055] The hot rolling temperature is 950℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0056] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0057] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 1mm.

[0058] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 106.4% IACS.

[0059] Example 5

[0060] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0061] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0062] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0063] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0064] The hot rolling temperature is 600℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0065] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0066] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0067] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 101.2% IACS.

[0068] Example 6

[0069] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0070] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0071] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0072] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0073] The hot rolling temperature is 1000℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0074] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0075] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0076] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 103.5% IACS.

[0077] Example 7

[0078] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0079] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0080] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 20mm and the thickness is 0.5mm.

[0081] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0082] The hot rolling temperature is 900℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0083] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0084] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 1mm.

[0085] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 104.2% IACS.

[0086] Example 8

[0087] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0088] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0089] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0090] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0091] The hot rolling temperature is 900℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0092] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0093] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0094] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 107.5% IACS.

[0095] Example 9

[0096] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0097] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0098] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0099] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0100] The hot rolling temperature is 800℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0101] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0102] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0103] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 104.3% IACS.

[0104] Example 10

[0105] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0106] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0107] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0108] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0109] The hot rolling temperature is 1000℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0110] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0111] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0112] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 102.6% IACS.

[0113] Example 11

[0114] This embodiment uses the preparation method disclosed in Example 1 to prepare highly conductive graphene copper wires, wherein both graphene powder and copper powder are purchased externally. The specific preparation process is as follows:

[0115] S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure that the graphene powder and copper powder are mixed evenly; wherein the mass percentage of graphene powder is 0.01wt%.

[0116] S2: The graphene-copper mixed powder prepared in step S1 is loaded into a single-crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene-copper rod; wherein the diameter of the single-crystal copper tube is 10mm and the thickness is 0.5mm.

[0117] S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a highly conductive graphene copper wire.

[0118] The hot rolling temperature is 1000℃, and the temperature is held for 10 minutes before each rolling pass. After the holding period, the graphene copper rod is immediately fed into 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 the hot-rolled graphene copper plate is finally obtained.

[0119] Using a wire cutting device, the hot-rolled graphene copper plate is completely cut off from the substrate to obtain graphene copper strips.

[0120] Graphene copper strips are used as raw materials and subjected to multiple drawing processes, with a deformation rate of 1% per drawing process, to draw high-conductivity graphene copper wires with a diameter of 0.5 mm.

[0121] The conductivity of the highly conductive graphene copper conductor prepared in step S3 was tested using the four-probe method, and its conductivity was found to be 99.6% IACS.

[0122] The specific parameters for Examples 2-11 are shown in Table 1.

[0123]

[0124] Example 12

[0125] This embodiment discloses a highly conductive graphene copper wire, which is prepared using the preparation method described in Example 1.

[0126] In summary, the method for preparing high-conductivity graphene copper wires disclosed in this invention enables integrated mass production. The process sequence is more rational, significantly improving production efficiency and reducing production costs. The high-conductivity graphene copper wires disclosed in this invention exhibit high conductivity, reaching 95-110% IACS. According to the national standard for electrical round copper wires, GB / T 3953-2024, the conductivity requirement for traditional TY wires is greater than 96% IACS, and for TR wires, it is greater than 100.9% IACS. This method shows promising application prospects in the aerospace and electronics industries.

[0127] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and 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, It includes the following steps: S1: Ingredients: Prepare graphene-copper mixed powder by mixing graphene powder with copper powder of 99.999% purity and mechanically stirring to ensure uniform mixing; wherein the mass percentage of graphene powder is 0.01 wt%. S2: The graphene copper powder prepared in step S1 is loaded into a single crystal copper tube, and the opening is welded and sealed with a cap to obtain a graphene copper rod; wherein the diameter of the single crystal copper tube is 10mm and the thickness is 0.5mm. S3: The graphene copper rod obtained in step S2 is hot-rolled, wire-cut, and drawn to obtain a high-conductivity graphene copper wire. The hot rolling temperature is 900℃, and the rod is held at the temperature for 10 minutes before each rolling pass. After the holding period, the rod is immediately fed into the hot rolling mill for rolling at a speed of 0.5 m / s. The final thickness of the graphene copper rod after rolling is 30% of the original thickness. Each rolling pass is 0.5 mm thick, resulting in a hot-rolled graphene copper plate. The hot-rolled graphene copper plate is completely cut off from the substrate using a wire cutting device to obtain a graphene copper strip. The graphene copper strip is used as raw material and subjected to multiple drawing processes, with a deformation rate of 1% per drawing pass, to obtain a high-conductivity graphene copper wire with a diameter of 0.5 mm.

2. The method for preparing the 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.

3. The method for preparing the highly conductive graphene copper wire according to claim 1, characterized in that, The specific steps of wire cutting described in step S3 are as follows: input the processing program into the controller, turn on the wire feed and water pump, adjust the water spray volume, then connect the power supply and select the matching parameters; cut the hot-rolled graphene copper plate completely off the substrate to obtain graphene copper strips.

4. A highly conductive graphene copper wire, characterized in that: It is prepared by the preparation method described in any one of claims 1-3.

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