Graphene-bonded silver wire and preparation method therefor

Abstract

A graphene-bonded silver wire. The graphene-bonded silver wire comprises the following components in percentages by weight: 6-8% of graphene, 0.5-5% of calcium and the balance of Ag. A preparation method therefor comprises the following steps: A1, preparation of a raw material powder; A2, sintering; A3, smelting; A4, continuous casting; A5, wire drawing; A6, annealing; and A7, coiling. By adding calcium to the graphene-bonded silver wire, and reasonably proportioning graphene, a graphene-bonded silver wire is obtained, and the mechanical properties of the bonded silver wire are effectively improved. During the annealing process, the bonded silver wire is firstly preheated and then heated at a high temperature, such that the bonded silver wire can undergo long-lasting annealing inside an annealing area, crystal grains inside the bonded silver wire are uniform and stable, and the mechanical properties of the graphene-bonded silver wire are effectively improved.

Description

Graphene bonded silver wire and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of bonded silver wire, in particular to a graphene bonded silver wire and a preparation method thereof. BACKGROUND

[0002] Silver alloy as a bonding wire material has high reflectivity, low value and other advantages, and is an ideal material for replacing gold wire in LED. However, silver alloy wire has the disadvantages of high resistivity and easy heating, so some high-power LEDs cannot replace gold wire. The graphene bonded silver wire can improve the electrical conductivity of silver alloy, so that the silver alloy can be applied to a larger power environment.

[0003] To improve the mechanical strength of the graphene bonded silver wire, the present application provides a graphene bonded silver wire and a preparation method thereof. SUMMARY

[0004] To solve the above problems, the present application provides a graphene bonded silver wire and a preparation method thereof.

[0005] The technical scheme adopted by the present application to solve the technical problems is: a graphene bonded silver wire, by weight fraction, comprising the following components: graphene 6%-8%, calcium 0.5%-5%, and the balance being Ag.

[0006] A graphene bonded silver wire preparation method, comprising the following steps:

[0007] A1. Prepare raw material powder, mix a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mix the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, and obtain pure silver / graphene oxide composite powder through sedimentation, washing and drying, and reduce the silver / graphene oxide composite powder to obtain a mixed raw material powder;

[0008] A2. Sintering, shape and sinter the mixed raw material powder and calcium powder obtained in step A1 to prepare a silver / graphene oxide composite material;

[0009] A3. Melting: add the silver / graphene oxide composite material obtained in step A2 to a melting furnace for melting, and keep the temperature at 1320-1620°C, and pour the refined alloy into a mold to cool the cast plate;

[0010] A4. Continuous casting, melt the alloy plate obtained in step A3 at 1200-1400°C, and cast it into a rod;

[0011] A5. Wire drawing, draw the alloy rod on a wire drawing machine to obtain a silver / graphene oxide composite wire;

[0012] A6. annealing, the silver / graphene oxide composite wire obtained in step A5 is introduced into an annealing device, annealing is carried out under nitrogen protection, the annealing device includes a preheating zone and an annealing zone, the temperature of the preheating zone is 320-420℃, and the internal temperature of the annealing zone is 420-550℃;

[0013] A7. winding, after the annealing in step A6 is completed, the graphene bonded silver wire is cooled to room temperature, and winding is carried out to obtain the graphene bonded silver wire.

[0014] As an optimization, the annealing device includes an annealing device body, a partition disc and a heating column are arranged in the interior of the annealing device body, an annealing space is opened in the interior of the annealing device body, the partition disc separates the annealing space into a preheating zone and an annealing zone, and the heating column is located at the lower side of the partition disc;

[0015] A first driving motor is connected to the top of the annealing device body, a second driving motor is connected to the bottom of the annealing device body, the first driving motor is used to drive the rotation of the partition disc, the second driving motor is used to drive the rotation of the heating column, the graphene bonded silver wire reaches the interior of the preheating zone through the hollow output shaft of the first driving motor, enters the annealing zone after passing through the partition disc, and is spirally wound on the outer circumferential surface of the heating column, a limiting baffle is arranged on the outer side of the heating column, and the graphene bonded silver wire is located between the limiting baffle and the heating column.

[0016] As an optimization, the first driving motor is a hollow shaft motor, and the output shaft of the first driving motor is coaxially arranged with the partition disc;

[0017] A threading hole is opened in the partition disc, the threading hole is arranged away from the axis of the partition disc, and a wire guide roller is arranged on the upper side of the threading hole.

[0018] As an optimization, the limiting baffle includes a limiting section and a guide section, the guide section is connected to the upper end of the limiting section, the distance between the guide section and the heating column decreases from top to bottom, the limiting section is arranged in parallel with the outer side of the heating column, and the distance between the limiting section and the heating column is between one diameter and two diameters of the graphene bonded silver wire.

[0019] As an optimization, the guide section is rotationally connected with an auxiliary air pipe, and the air outlet of the auxiliary air pipe is arranged towards the space between the guide section and the heating column.

[0020] The lower end of the limiting section is connected with a limiting wedge, a spring rotating shaft is connected between the limiting wedge and the limiting section, the lower end of the limiting wedge is in contact with the heating column, and the graphene bonded silver wire is located on the upper side of the lower end of the limiting wedge.

[0021] As optimization, the top of the annealing device body is connected with an air inlet pipe, the lower part of the annealing device body is connected with an air outlet pipe, and the bottom of the annealing device body is provided with an outlet hole.

[0022] As optimization, the inner wall of the annealing device body is provided with a support frame for connecting the limiting baffle.

[0023] The graphene bonded silver wire has the following advantages:

[0024] The graphene bonded silver wire provided by the application adds calcium elements and reasonably matches the graphene, so that a graphene bonded silver wire is obtained, and the mechanical properties of the bonded silver wire are effectively improved.

[0025] The graphene bonded silver wire is subjected to zoned annealing by the annealing device, the bonded silver wire is first preheated and then subjected to high-temperature heating in the annealing process, so that the bonded silver wire can be subjected to long-term annealing inside the annealing zone, the internal crystal grains of the bonded silver wire are uniform and stable, and the mechanical properties of the graphene bonded silver wire are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a schematic view of the annealing device from the shaft side.

[0027] Fig. 2 is a schematic view of the bottom of the annealing device from the shaft side.

[0028] Fig. 3 is a schematic view of the main body of the annealing device from the front side.

[0029] Fig. 4 is a schematic view of the A-A section of Fig. 3.

[0030] Fig. 5 is a schematic view of the annealing device from the left side.

[0031] Fig. 6 is a schematic view of the B-B section of Fig. 5.

[0032] Fig. 7 is a schematic view of the connection structure of the partition disc and the heating column from the shaft side.

[0033] Fig. 8 is a schematic view of the bottom of the connection structure of the partition disc and the heating column from the shaft side.

[0034] In the figure, 1 is the annealing device body, 2 is the partition disc, 3 is the heating column, 4 is the preheating zone, 5 is the annealing zone, 6 is the first driving motor, 7 is the second driving motor, 8 is the limiting baffle, 9 is the threading hole, 10 is the guide section, 11 is the auxiliary air pipe, 12 is the limiting wedge, 13 is the air inlet pipe, and 14 is the air outlet pipe. DETAILED DESCRIPTION

[0035] The graphene bonded silver wire comprises the following components in terms of weight fraction: graphene 6%-8%, calcium 0.5%-5%, and the balance is Ag.

[0036] A method for preparing graphene bonded silver wire, comprising the following steps:

[0037] A1. Preparing raw material powder, mixing a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mixing the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, obtaining pure silver / graphene oxide composite powder through sedimentation, washing and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder;

[0038] A2. Sintering, performing forming and sintering treatment on the mixed raw material powder and calcium powder obtained in step A1 to prepare a silver / graphene oxide composite material;

[0039] A3. Melting: adding the silver / graphene oxide composite material obtained in step A2 into a melting furnace for melting, keeping the temperature at 1320-1620°C, and pouring the refined alloy into a mold for cooling and casting a plate;

[0040] A4. Continuous casting, melting the alloy plate obtained in step A3 at 1200-1400°C and drawing it into a rod;

[0041] A5. Drawing, drawing the alloy rod on a drawing machine to obtain a silver / graphene oxide composite wire;

[0042] A6. Annealing, introducing the silver / graphene oxide composite wire obtained in step A5 into an annealing device for annealing under nitrogen protection, the annealing device including a preheating zone 4 and an annealing zone 5, the temperature of the preheating zone 4 being 320-420°C, and the internal temperature of the annealing zone 5 being 420-550°C;

[0043] A7. Winding, cooling the graphene bonded silver wire after annealing in step A6 to room temperature, and winding to obtain the graphene bonded silver wire.

[0044] Example 1:

[0045] A graphene bonded silver wire, comprising the following components by weight fraction: graphene 6%, calcium 5%, and the balance being Ag.

[0046] A method for preparing graphene bonded silver wire, comprising the following steps:

[0047] A1. Preparing raw material powder, mixing a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mixing the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, obtaining pure silver / graphene oxide composite powder through sedimentation, washing and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder;

[0048] A2. Sintering: the mixed raw material powder and calcium powder obtained in step A1 are subjected to molding and sintering treatment to obtain a silver / graphene oxide composite material;

[0049] A3. Melting: the silver / graphene oxide composite material obtained in step A2 is added into a melting furnace for melting, the temperature is kept at 1320℃, and after refining, the alloy plate is poured into a mold for cooling;

[0050] A4. Continuous casting: the alloy plate obtained in step A3 is melted at 1200℃ and drawn into a rod;

[0051] A5. Wire drawing: the alloy rod is drawn on a wire drawing machine to obtain a silver / graphene oxide composite wire;

[0052] A6. Annealing: the silver / graphene oxide composite wire obtained in step A5 is introduced into an annealing device for annealing under nitrogen protection, the annealing device includes a preheating zone 4 and an annealing zone 5, the temperature of the preheating zone 4 is 320℃, and the temperature of the annealing zone 5 is 420℃;

[0053] A7. Winding: after the annealing in step A6 is completed, the graphene bonded silver wire is cooled to room temperature and wound to obtain the graphene bonded silver wire.

[0054] Example 2:

[0055] A graphene bonded silver wire, comprising the following components by weight fraction: graphene 8%, calcium 0.5%, and the balance being Ag.

[0056] A method for preparing a graphene bonded silver wire, comprising the following steps:

[0057] A1. Preparation of raw material powder: a 2% graphene oxide solution is mixed with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, the mixed solution is mixed with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, the suspension is subjected to sedimentation, washing, and drying to obtain pure silver / graphene oxide composite powder, and the silver / graphene oxide composite powder is subjected to reduction treatment to obtain a mixed raw material powder;

[0058] A2. Sintering: the mixed raw material powder and calcium powder obtained in step A1 are subjected to molding and sintering treatment to obtain a silver / graphene oxide composite material;

[0059] A3. Melting: the silver / graphene oxide composite material obtained in step A2 is added into a melting furnace for melting, the temperature is kept at 1620℃, and after refining, the alloy plate is poured into a mold for cooling;

[0060] A4. Continuous casting: the alloy plate obtained in step A3 is melted at 1400℃ and drawn into a rod;

[0061] A5. Drawing, drawing the alloy rod on a drawing machine to obtain silver / graphene oxide composite wire;

[0062] A6. Annealing, introducing the silver / graphene oxide composite wire obtained in step A5 into an annealing device to perform annealing under nitrogen protection, the annealing device internally comprising a preheating zone 4 and an annealing zone 5, the temperature of the preheating zone 4 being 420°C, and the internal temperature of the annealing zone 5 being 550°C;

[0063] A7. Winding, cooling the graphene bonded silver wire after the annealing in step A6 to room temperature, and winding to obtain the graphene bonded silver wire.

[0064] Example 3:

[0065] A graphene bonded silver wire, comprising the following components in terms of weight fraction: graphene 7%, calcium 3%, and the balance being Ag.

[0066] A method for preparing a graphene bonded silver wire, comprising the following steps:

[0067] A1. Preparing raw material powder, mixing a 2% graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mixing the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, and obtaining pure silver / graphene oxide composite powder through sedimentation, washing, and drying, and performing reduction treatment on the silver / graphene oxide composite powder to obtain mixed raw material powder;

[0068] A2. Sintering, performing forming and sintering treatment on the mixed raw material powder and calcium powder obtained in step A1 to prepare a silver / graphene oxide composite material;

[0069] A3. Melting, adding the silver / graphene oxide composite material obtained in step A2 into a melting furnace to perform melting, keeping the temperature at 1460°C, and pouring the molten material into a mold to cool the cast plate after refining is completed;

[0070] A4. Continuous casting, melting the alloy plate obtained in step A3 at 1300°C, and casting into a rod;

[0071] A5. Drawing, drawing the alloy rod on a drawing machine to obtain silver / graphene oxide composite wire;

[0072] A6. Annealing, introducing the silver / graphene oxide composite wire obtained in step A5 into an annealing device to perform annealing under nitrogen protection, the annealing device internally comprising a preheating zone 4 and an annealing zone 5, the temperature of the preheating zone 4 being 370°C, and the internal temperature of the annealing zone 5 being 480°C;

[0073] A7. Winding, cooling the graphene bonded silver wire after the annealing in step A6 to room temperature, and winding to obtain the graphene bonded silver wire.

[0074] Comparative Example 1:

[0075] A graphene bonded silver wire includes, by weight fraction: graphene 6%, the balance being Ag.

[0076] A method for preparing a graphene bonded silver wire includes the following steps:

[0077] A1. Prepare a raw material powder, mix a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mix the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, and obtain pure silver / graphene oxide composite powder through sedimentation, washing, and drying, and reduce the silver / graphene oxide composite powder to obtain a mixed raw material powder;

[0078] A2. Sintering, shape and sinter the mixed raw material powder obtained in step A1 and calcium powder to prepare a silver / graphene oxide composite material;

[0079] A3. Melting: add the silver / graphene oxide composite material obtained in step A2 to a melting furnace for melting, maintain the temperature at 1320°C, and pour the refined alloy plate into a mold for cooling after refining;

[0080] A4. Continuous casting, melt the alloy plate obtained in step A3 at 1200°C and cast it into a rod;

[0081] A5. Wire drawing, draw the alloy rod on a wire drawing machine to obtain a silver / graphene oxide composite wire;

[0082] A6. Annealing, introduce the silver / graphene oxide composite wire obtained in step A5 into an annealing device and anneal it under nitrogen protection, the annealing device includes a preheating zone 4 and an annealing zone 5, the temperature of the preheating zone 4 is 320°C, and the internal temperature of the annealing zone 5 is 420°C;

[0083] A7. Winding, cool the graphene bonded silver wire after step A6 annealing to room temperature, and wind it to obtain the graphene bonded silver wire.

[0084] Comparative Example 2:

[0085] A graphene bonded silver wire includes, by weight fraction: graphene 8%, calcium 0.5%, the balance being Ag.

[0086] A method for preparing a graphene bonded silver wire includes the following steps:

[0087] A1. Preparation of raw material powder, mixing a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mixing the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, and obtaining pure silver / graphene oxide composite powder through sedimentation, washing and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder;

[0088] A2. Sintering, forming and sintering the mixed raw material powder obtained in step A1 and calcium powder to prepare a silver / graphene oxide composite material;

[0089] A3. Melting: adding the silver / graphene oxide composite material obtained in step A2 into a melting furnace for melting, keeping the temperature at 1620℃, and pouring the refined alloy into a mold for cooling after refining;

[0090] A4. Continuous casting, melting the alloy plate obtained in step A3 at 1400℃, and drawing into a rod;

[0091] A5. Drawing, drawing the alloy rod on a drawing machine to obtain a silver / graphene oxide composite wire;

[0092] A6. Annealing, annealing the silver / graphene oxide composite wire obtained in step A5 at an annealing temperature of 550℃;

[0093] A7. Winding, cooling the graphene bonded silver wire obtained after step A6 to room temperature, and winding to obtain the graphene bonded silver wire.

[0094] The graphene bonded silver wire obtained in Examples 1-3 and Comparative Examples 1-2 was subjected to mechanical property testing, and the test results are as follows:

[0095] As can be seen from Examples 1 and Comparative Example 1, the graphene bonded silver wire of the present application has a reasonable ratio and high mechanical properties; as can be seen from Examples 2 and Comparative Example 2, the graphene bonded silver wire obtained by annealing in the annealing device of the present application has more excellent mechanical properties.

[0096] As shown in FIGS. 1-8, the annealing device comprises an annealing device body 1, a partition disc 2 and a heating column 3 are arranged inside the annealing device body 1, an annealing space is formed in the annealing device body 1, the partition disc 2 divides the annealing space into a preheating zone 4 and an annealing zone 5, and the heating column 3 is located below the partition disc 2;

[0097] The top of the annealing device body 1 is connected with a first driving motor 6, and the bottom of the annealing device body 1 is connected with a second driving motor 7, the first driving motor 6 is used for driving the separation disc 2 to rotate, and the second driving motor 7 is used for driving the heating column 3 to rotate, the graphene bonded silver wire reaches the preheating area 4 inside through the hollow output shaft of the first driving motor 6, enters the annealing area 5 after passing through the separation disc 2, and is spirally wound outside the circumferential surface of the heating column 3, the outer side of the heating column 3 is provided with a limiting baffle 8, and the graphene bonded silver wire is located between the limiting baffle 8 and the heating column 3.

[0098] The outer periphery of the separation disc 2 is arranged adjacent to the inner wall of the annealing device body 1, the first driving motor 6 can drive the separation disc 2 to rotate in the annealing device body 1, and when the separation disc 2 rotates, the graphene bonded silver wire can be wound on the heating column 3.

[0099] The rotation direction of the heating column 3 is opposite to that of the separation disc 2, as shown in the figure, the heating column 3 rotates clockwise in the top view, and the separation disc 2 rotates counterclockwise, when the heating column 3 rotates, the winding efficiency of the graphene bonded silver wire can be improved, and at the same time, the graphene bonded silver wire located at the bottom can also be pulled out downward.

[0100] As shown in Figure 7, the first driving motor 6 is a hollow shaft motor, and the output shaft of the first driving motor 6 is coaxially arranged with the separation disc 2.

[0101] The separation disc 2 is provided with a threading hole 9, and the threading hole 9 is arranged away from the axis of the separation disc 2, and the upper side of the threading hole 9 is provided with a wire guide roller.

[0102] The wire guide roller is used for guiding the graphene bonded silver wire, and reducing the friction of the graphene bonded silver wire when walking in the device.

[0103] As shown in Figure 8, the limiting baffle 8 includes a limiting section and a guide section 10, the guide section 10 is connected to the upper end of the limiting section, the distance between the guide section 10 and the heating column 3 decreases from top to bottom, the limiting section is arranged in parallel between the outer side of the heating column 3, and the distance between the limiting section and the heating column 3 is between one diameter and two diameters of the graphene bonded silver wire.

[0104] The limiting baffle 8 can be arranged when the graphene bonded silver wire approaches the heating column 3, and can also avoid the graphene bonded silver wire from knotting and winding in the device.

[0105] As shown in Figure 8, the guide section 10 is rotatably connected with an auxiliary air pipe 11, and the air outlet of the auxiliary air pipe 11 is arranged between the guide section 10 and the heating column 3.

[0106] The lower end of the limiting section is connected with a limiting wedge 12, and a spring rotating shaft is connected between the limiting wedge 12 and the limiting section, the lower end of the limiting wedge 12 is in contact with the heating column 3, and the graphene bonded silver wire is located on the upper side of the lower end of the limiting wedge 12.

[0107] The limiting wedge 12 can prevent the graphene bonded silver wire from being pulled out from between the heating column 3 and the limiting baffle 8, and the lower end of the limiting wedge 12 is always in abutment between the outer wall of the heating column 3 under the action of the spring rotating shaft.

[0108] As shown in FIG. 4, the top of the annealing device body 1 is connected with an air inlet pipe 13, the lower part of the annealing device body 1 is connected with an air outlet pipe 14, and the bottom of the annealing device body 1 is provided with a wire outlet hole.

[0109] As shown in FIG. 4, the inner wall of the annealing device body 1 is provided with a support frame for connecting the limiting baffle 8.

[0110] In specific use, the graphene bonded silver wire passes through the shaft center of the first driving motor 6 into the preheating area 4, is arranged in parallel near the partition disc 2 in the preheating area 4, and is guided by the wire roller and then passes through the threading hole 9 downward;

[0111] The first driving motor 6 drives the partition disc 2 to rotate, so that the graphene bonded silver wire is wound on the heating column 3 and is uniformly distributed between the heating column 3 and the limiting baffle 8 along the circumferential surface of the heating column 3.

[0112] The lower end of the graphene bonded silver wire leaves the annealing device body 1 through the wire outlet hole and enters the next process.

[0113] In the process of winding on the heating column 3, the graphene bonded silver wire is obliquely blown downward by the auxiliary air pipe 11, the hot air pushes the graphene bonded silver wire downward between the heating column 3 and the limiting baffle 8, so that the graphene bonded silver wire can move downward and be uniformly distributed on the outside of the heating column 3. The blowing can keep the temperature in the heating column 3 uniform, avoiding uneven heating of the graphene bonded silver wire.

[0114] The above specific embodiments are only specific cases of the present application, and the patent protection scope of the present application includes but is not limited to the product forms and styles of the above specific embodiments, and any appropriate changes or modifications made by any ordinary skilled person in the corresponding technical field to the graphene bonded silver wire and the preparation method thereof according to the claims of the present application shall fall within the patent protection scope of the present application.

Claims

1. A graphene bonded silver wire, characterized by: By weight fraction, it comprises the following components: graphene 6%-8%, calcium 0.5%-1.5%, and the balance is Ag.

2. A method for producing the graphene bonded silver wire of claim 1, wherein: It comprises the following steps: A1. Preparing raw material powder, mixing a 2% mass concentration graphene oxide solution with a 0.1 mol / L ascorbic acid solution to obtain a mixed solution, mixing the mixed solution with a 0.1 mol / L silver nitrate solution to obtain a silver / graphene oxide composite powder suspension, and obtaining pure silver / graphene oxide composite powder through sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, performing forming and sintering treatment on the mixed raw material powder and calcium powder obtained in step A1 to prepare a silver / graphene oxide composite material; A3. Melting: adding the silver / graphene oxide composite material obtained in step A2 into a melting furnace for melting, keeping the temperature at 1320-1620 DEG C, and pouring into a mold after refining to cool the alloy plate; A4. Continuous casting, melting the alloy plate obtained in step A3 at 1200-1400 DEG C, and drawing into a rod; A5. Drawing, drawing the alloy rod on a drawing machine to obtain a silver / graphene oxide composite wire; A6. Annealing, introducing the silver / graphene oxide composite wire obtained in step A5 into an annealing device for annealing under nitrogen protection, the annealing device internally comprising a preheating zone (4) and an annealing zone (5), the preheating zone (4) having a temperature of 320-420 DEG C, and the annealing zone (5) having an internal temperature of 420-550 DEG C; A7. Winding, cooling the graphene bonded silver wire after annealing in step A6 to room temperature, and winding to obtain the graphene bonded silver wire.

3. The method of claim 2, wherein the graphene bonding silver wire is prepared by the steps of: providing a graphene sheet; providing a silver wire; and bonding the graphene sheet to the silver wire. The annealing device comprises an annealing device body (1), a separation disc (2), and a heating column (3) arranged inside the annealing device body (1), an annealing space is formed in the annealing device body (1), the separation disc (2) divides the annealing space into a preheating zone (4) and an annealing zone (5), and the heating column (3) is located below the separation disc (2); A first driving motor (6) is connected to the top of the annealing device body (1), a second driving motor (7) is connected to the bottom of the annealing device body (1), the first driving motor (6) is used to drive the rotation of the separation disc (2), the second driving motor (7) is used to drive the rotation of the heating column (3), the graphene bonded silver wire reaches the inside of the preheating zone (4) through the hollow output shaft of the first driving motor (6), enters the annealing zone (5) after passing through the separation disc (2), and is spirally wound outside the circumferential surface of the heating column (3), a limiting baffle (8) is arranged outside the heating column (3), and the graphene bonded silver wire is located between the limiting baffle (8) and the heating column (3).

4. The method of claim 3, wherein the graphene bonding silver wire is prepared by the steps of: providing a graphene sheet; providing a silver wire; and bonding the graphene sheet to the silver wire. The first driving motor (6) is a hollow shaft motor, and the output shaft of the first driving motor (6) is coaxially arranged with the separation disc (2); The separation disc (2) is provided with a threading hole (9) which is arranged away from the axis of the separation disc (2), and a wire guide roller is arranged on the upper side of the threading hole (9).

5. The method for preparing graphene-bonded silver wire according to claim 3, characterized in that: The limiting baffle (8) comprises a limiting section and a guide section (10), the guide section (10) is connected to the upper end of the limiting section, the distance between the guide section (10) and the heating column (3) decreases from top to bottom, the limiting section is arranged in parallel between the limiting section and the outer side of the heating column (3), and the distance between the limiting section and the heating column (3) is between one diameter and two diameters of the graphene bonded silver wire.

6. The method of claim 5, wherein the graphene bonding silver wire is prepared by the steps of: providing a graphene sheet; providing a silver wire; and bonding the graphene sheet to the silver wire. The guide section (10) is rotationally connected with an auxiliary air pipe (11), and the air outlet of the auxiliary air pipe (11) is arranged between the guide section (10) and the heating column (3). The lower end of the limiting section is connected with a limiting wedge block (12), a spring rotating shaft is connected between the limiting wedge block (12) and the limiting section, the lower end of the limiting wedge block (12) is in contact with the heating column (3), and the graphene bonded silver wire is located on the upper side of the lower end of the limiting wedge block (12).

7. The method for preparing graphene-bonded silver wire according to claim 3, characterized in that: The top of the annealing device body (1) is connected with an air inlet pipe (13), the lower part of the annealing device body (1) is connected with an air outlet pipe (14), and the bottom of the annealing device body (1) is provided with a wire outlet hole.

8. The method for preparing graphene-bonded silver wire according to claim 3, characterized in that: The inner wall of the annealing device body (1) is provided with a support frame for connecting the limiting baffle (8).

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