Graphene bonded silver wire and preparation method thereof

Abstract

The invention relates to the technical field of bonding silver wires, in particular to a graphene bonding silver wire and a preparation method thereof. The graphene bonded silver wire comprises the following components in percentage by weight: 6%-8% of graphene, 0.5%-5% of calcium and the balance of Ag. The invention discloses a preparation method of a graphene bonded silver wire. The preparation method comprises the following steps: A1, preparing raw material powder; a2, sintering is conducted; a3, smelting is conducted; a4, continuous casting is conducted; a5, wire drawing; a6, annealing is conducted; and A7, rolling is conducted. According to the graphene bonded silver wire, the calcium element is added into the graphene bonded silver wire, and graphene is reasonably proportioned, so that the graphene bonded silver wire is obtained, and the mechanical property of the bonded silver wire is effectively improved; in the annealing process, the bonding silver wire is preheated firstly and then heated at a high temperature, so that the bonding silver wire can be annealed for a long time in an annealing area, crystal grains in the bonding silver wire are uniform and stable, and the mechanical property of the graphene bonding silver wire is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of silver bonding wires, and in particular to a graphene silver bonding wire and a preparation method thereof. Background Art

[0002] Silver alloy as a bonding wire material has the advantages of high reflectivity and low cost, and is an ideal material to replace 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. Graphene bonding silver wire can improve the conductivity of silver alloy, so that silver alloy can be used in a higher power environment.

[0003] In order to improve the mechanical strength of graphene-bonded silver wire, the present application provides a graphene-bonded silver wire and a preparation method thereof. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a graphene-bonded silver wire and a preparation method thereof.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a graphene-bonded silver wire, which comprises the following components by weight: 6%-8% graphene, 0.5%-5% calcium, and the balance Ag.

[0006] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1320°C-1620°C. After refining, the cast plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1200 ℃ -1400 ℃, and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing under nitrogen protection, the annealing device includes a preheating zone and an annealing zone, the preheating zone temperature is 320°C-420°C, and the annealing zone internal temperature is 420°C-550°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0007] As an optimization, the annealing device comprises an annealing device body, a partition plate and a heating column are arranged inside the annealing device body, an annealing space is opened inside the annealing device body, the partition plate divides the annealing space into a preheating zone and an annealing zone, and the heating column is located at the lower side of the partition plate; A first driving motor is connected to the top of the annealing device body, and a second driving motor is connected to the bottom of the annealing device body. The first driving motor is used to drive the partition plate to rotate, and the second driving motor is used to drive the heating column to rotate. The graphene bonding silver wire reaches the inside of the preheating zone through the hollow output shaft of the first driving motor, and enters the annealing zone after passing through the partition plate. The graphene bonding silver wire is spirally coiled around the outside of the circumferential surface of the heating column. A limiting baffle is provided on the outside of the heating column, and the graphene bonding silver wire is located between the limiting baffle and the heating column.

[0008] As an optimization, the first drive motor is a hollow shaft motor, and the output shaft of the first drive motor is coaxially arranged with the separation disk; The separation disk is provided with a threading hole, which is arranged away from the axis of the separation disk, and a conductor roller is arranged on the upper side of the threading hole.

[0009] As an optimization, the limit baffle includes a limit section and a guide section, the guide section is connected to the upper end of the limit section, the distance between the guide section and the heating column decreases from top to bottom, the limit section is arranged in parallel to the outer side surface of the heating column, and the distance between the limit section and the heating column is between one and two times the diameter of the graphene bonding silver wire.

[0010] As an optimization, the guide section is rotatably connected to an auxiliary air duct, and the air outlet of the auxiliary air duct is arranged between the guide section and the heating column; The lower end of the limiting section is connected to a limiting wedge block, a spring shaft is connected between the limiting wedge block and the limiting section, the lower end of the limiting wedge block is in contact with the heating column, and the graphene bonding silver wire is located on the upper side of the lower end of the limiting wedge block.

[0011] As an 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 exhaust pipe, and the bottom of the annealing device body is provided with a wire outlet hole.

[0012] As an optimization, a support frame is provided on the inner wall of the annealing device body, and the support frame is used to connect the limit baffle.

[0013] A graphene-bonded silver wire and a preparation method thereof have the following benefits: The present application provides a graphene-bonded silver wire, by adding calcium elements and reasonably proportioning the graphene to obtain a graphene-bonded silver wire, which effectively improves the mechanical properties of the bonding silver wire; The graphene bonding silver wire of the present application is subjected to zone annealing by the annealing device of the present application. During the annealing process, the bonding silver wire is first preheated and then heated at a high temperature, so that the bonding silver wire can be subjected to long-term annealing inside the annealing zone, so that the grains inside the bonding silver wire are uniform and stable, thereby effectively improving the mechanical properties of the graphene bonding silver wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the axial side of the annealing device of the present invention.

[0015] Figure 2 It is a schematic diagram of the bottom axial side of the annealing device of the present invention.

[0016] Figure 3 It is a schematic front view of the main body of the annealing device of the present invention.

[0017] Figure 4 For the present invention Figure 3 Schematic diagram of the AA section structure.

[0018] Figure 5 It is a left schematic view of the annealing device of the present invention.

[0019] Figure 6 For the present invention Figure 5 Schematic diagram of the BB cross-section structure.

[0020] Figure 7 It is an axial schematic diagram of the connection structure between the separation plate and the heating column of the present invention.

[0021] Figure 8 It is a schematic diagram of the bottom axial side of the connection structure between the separation plate and the heating column of the present invention.

[0022] Among them, 1. annealing device body, 2. separation plate, 3. heating column, 4. preheating zone, 5. annealing zone, 6. first drive motor, 7. second drive motor, 8. limit baffle, 9. threading hole, 10. guide section, 11. auxiliary air duct, 12. limit wedge block, 13. air inlet duct, 14. exhaust duct. DETAILED DESCRIPTION

[0023] A graphene-bonded silver wire comprises the following components by weight: 6%-8% graphene, 0.5%-5% calcium, and the balance Ag.

[0024] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1320°C-1620°C. After refining, the cast plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1200 ℃ -1400 ℃, and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone 4 and an annealing zone 5, wherein the temperature of the preheating zone 4 is 320°C-420°C, and the temperature of the annealing zone 5 is 420°C-550°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0025] Embodiment 1: A graphene bonding silver wire comprises the following components by weight: 6% graphene, 5% calcium, and the balance Ag.

[0026] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1320°C. After refining, the casting plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1200 ° C and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone 4 and an annealing zone 5, wherein the temperature of the preheating zone 4 is 320°C, and the temperature of the annealing zone 5 is 420°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0027] Embodiment 2: A graphene bonding silver wire comprises the following components by weight: 8% graphene, 0.5% calcium, and the balance Ag.

[0028] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1620°C. After refining, the casting plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1400 ° C, and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone 4 and an annealing zone 5, wherein the temperature of the preheating zone 4 is 420°C, and the temperature of the annealing zone 5 is 550°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0029] Embodiment 3: A graphene-bonded silver wire comprises the following components by weight: 7% graphene, 3% calcium, and the balance Ag.

[0030] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1460°C. After refining, the casting plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1300 ° C and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone 4 and an annealing zone 5, wherein the temperature of the preheating zone 4 is 370°C, and the temperature of the annealing zone 5 is 480°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0031] Comparative Example 1: A graphene-bonded silver wire comprises the following components by weight: 6% graphene and the balance Ag.

[0032] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1320°C. After refining, the casting plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1200 ° C and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone 4 and an annealing zone 5, wherein the temperature of the preheating zone 4 is 320°C, and the temperature of the annealing zone 5 is 420°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0033] Comparative Example 2: A graphene bonding silver wire comprises the following components by weight: 8% graphene, 0.5% calcium, and the balance Ag.

[0034] A method for preparing graphene-bonded silver wire comprises the following steps: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1620°C. After refining, the cast plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1400 ° C, and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire drawing machine to obtain a silver / graphene oxide composite wire; A6. Annealing, annealing the silver / graphene oxide composite wire obtained in step A5 at a temperature of 550°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

[0035] The mechanical properties of the graphene bonded silver wires obtained in Examples 1-3 and Comparative Examples 1-2 were tested, and the test results are as follows:

[0036] It can be seen from Example 1 and Comparative Example 1 that the graphene bonding silver wire of the present application has a reasonable ratio and has high mechanical properties; compared with Comparative Example 2, it can be seen that the bonding silver wire obtained by annealing with the annealing device of the present application has more excellent mechanical properties.

[0037] like Figure 1-8 As shown, the annealing device comprises an annealing device body 1, a partition plate 2 and a heating column 3 are arranged inside the annealing device body 1, an annealing space is opened inside the annealing device body 1, the partition plate 2 divides the annealing space into a preheating zone 4 and an annealing zone 5, and the heating column 3 is located at the lower side of the partition plate 2; A first drive motor 6 is connected to the top of the annealing device body 1, and a second drive motor 7 is connected to the bottom of the annealing device body 1. The first drive motor 6 is used to drive the separation plate 2 to rotate, and the second drive motor 7 is used to drive the heating column 3 to rotate. The graphene bonding silver wire reaches the inside of the preheating zone 4 through the hollow output shaft of the first drive motor 6, passes through the separation plate 2 and enters the annealing zone 5. The graphene bonding silver wire is spirally coiled around the outside of the circumferential surface of the heating column 3. A limit baffle 8 is provided on the outside of the heating column 3, and the graphene bonding silver wire is located between the limit baffle 8 and the heating column 3.

[0038] The outer periphery of the partition plate 2 is arranged adjacent to the inner wall of the annealing device body 1 , and the first driving motor 6 can drive the partition plate 2 to rotate inside the annealing device body 1 . When the partition plate 2 rotates, it can drive the graphene bonding silver wire to wind on the heating column 3 .

[0039] The rotation direction of the heating column 3 is opposite to that of the separation disk 2. As shown in the figure, the heating column 3 rotates clockwise in the top view, and the separation disk 2 rotates counterclockwise. When the heating column 3 rotates, the winding efficiency of the graphene bonding silver wire can be improved, and the graphene bonding silver wire at the bottom can also be removed downward.

[0040] like Figure 7 As shown, the first drive motor 6 is a hollow shaft motor, and the output shaft of the first drive motor 6 is coaxially arranged with the separation disc 2; The separation plate 2 is provided with a threading hole 9 , which is arranged away from the axis of the separation plate 2 , and a wire roller is arranged on the upper side of the threading hole 9 .

[0041] The wire roller is used to guide the graphene bonding silver wire and create friction for the graphene bonding silver wire to move inside the device.

[0042] like Figure 8As shown, the limit baffle 8 includes a limit section and a guide section 10, the guide section 10 is connected to the upper end of the limit section, the distance between the guide section 10 and the heating column 3 decreases from top to bottom, the limit section is arranged in parallel to the outer side surface of the heating column 3, and the distance between the limit section and the heating column 3 is between one and two times the diameter of the graphene bonding silver wire.

[0043] The limiting baffle 8 can place the graphene bonding silver wire close to the heating column 3 and prevent the graphene bonding silver wire from being knotted or entangled inside the device.

[0044] like Figure 8 As shown, the guide section 10 is rotatably connected to an auxiliary air duct 11, and the air outlet of the auxiliary air duct 11 is arranged toward between the guide section 10 and the heating column 3; The lower end of the limiting section is connected to a limiting wedge 12 , a spring 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 bonding silver wire is located on the upper side of the lower end of the limiting wedge 12 .

[0045] The limiting wedge block 12 can prevent the graphene bonding silver wire from escaping from between the heating column 3 and the limiting baffle 8, and under the action of the spring shaft, the lower end of the limiting wedge block 12 is always tightly pressed against the outer wall of the heating column 3.

[0046] like Figure 4 As shown, the top of the annealing device body 1 is connected to an air inlet pipe 13, the lower part of the annealing device body 1 is connected to an exhaust pipe 14, and the bottom of the annealing device body 1 is provided with a wire outlet hole.

[0047] like Figure 4 As shown, a support frame is provided on the inner wall of the annealing device body 1 , and the support frame is used to connect the limit baffle 8 .

[0048] When the device is used, the graphene bonding silver wire passes through the axis of the first driving motor 6 and enters the preheating zone 4, is arranged parallel to the separation plate 2 in the preheating zone 4, and passes downward through the threading hole 9 after being guided by the wire roller; The first driving motor 6 drives the separation plate 2 to rotate, so that the graphene bonding silver wire is wound around the heating column 3 and evenly distributed downward along the circumference of the heating column 3 between the heating column 3 and the limit baffle 8; The lower end of the graphene bonding silver wire leaves the annealing device body 1 through the wire outlet hole and enters the next process.

[0049] When the graphene bonding silver wire is wound onto the heating column 3, the auxiliary air duct 11 blows air obliquely downward, and the hot air pushes the graphene bonding silver wire downward between the heating column 3 and the limit baffle 8, so that the graphene bonding silver wire can move downward and be evenly distributed outside the heating column 3. The internal temperature of the heating column 3 can be kept uniform by blowing air, so as to avoid uneven heating of the graphene bonding silver wire.

[0050] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific embodiments. Any graphene bonded silver wire and its preparation method that conform to the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A graphene bonding silver wire, characterized in that: Calculated by weight, the composition includes: 6%-8% graphene, 0.5%-1.5% calcium, and the balance is Ag.

2. A method for preparing a graphene-bonded silver wire, for producing the graphene-bonded silver wire according to claim 1, characterized in that: The steps include: A1. preparing a 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 suspension of a silver / graphene oxide composite powder, and obtaining a pure silver / graphene oxide composite powder by sedimentation, washing, and drying, and reducing the silver / graphene oxide composite powder to obtain a mixed raw material powder; A2. Sintering, forming and sintering the mixed raw material powder and calcium powder obtained in step A1 to obtain a silver / graphene oxide composite material; A3. Melting: The silver / graphene oxide composite material obtained in step A2 is added to a melting furnace for melting, and the temperature is maintained at 1320°C-1620°C. After refining, the cast plate is poured into a mold and cooled; A4 continuous casting, the alloy plate obtained in step A3 is melted at 1200 ℃ -1400 ℃, and drawn into a rod; A5. Wire drawing: drawing the alloy rod on a wire 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, and annealing is performed under nitrogen protection, wherein the annealing device includes a preheating zone (4) and an annealing zone (5), wherein the temperature of the preheating zone (4) is 320°C-420°C, and the temperature of the annealing zone (5) is 420°C-550°C; A7. Rolling up: the graphene bonding silver wire after annealing in step A6 is cooled to room temperature and rolled up.

3. A method for preparing graphene bonded silver wire according to claim 2, characterized in that: The annealing device comprises an annealing device body (1), a partition plate (2) and a heating column (3) are arranged inside the annealing device body (1), an annealing space is opened inside the annealing device body (1), the partition plate (2) divides the annealing space into a preheating zone (4) and an annealing zone (5), and the heating column (3) is located at the lower side of the partition plate (2); The top of the annealing device body (1) is connected to a first drive motor (6), and the bottom of the annealing device body (1) is connected to a second drive motor (7). The first drive motor (6) is used to drive the separation disk (2) to rotate, and the second drive motor (7) is used to drive the heating column (3) to rotate. The graphene bonding silver wire reaches the inside of the preheating zone (4) through the hollow output shaft of the first drive motor (6), passes through the separation disk (2) and enters the annealing zone (5). The graphene bonding silver wire is spirally wound around the outside of the circumferential surface of the heating column (3). A limit baffle (8) is provided on the outside of the heating column (3), and the graphene bonding silver wire is located between the limit baffle (8) and the heating column (3).

4. The method for preparing graphene-bonded silver wire according to claim 3, characterized in that: The first drive motor (6) is a hollow shaft motor, and the output shaft of the first drive motor (6) is coaxially arranged with the separation disc (2); The separation disk (2) is provided with a threading hole (9), the threading hole (9) is arranged away from the axis of the separation disk (2), and a wire 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 limit baffle (8) comprises a limit section and a guide section (10), wherein the guide section (10) is connected to the upper end of the limit section, and the distance between the guide section (10) and the heating column (3) decreases from top to bottom. The limit section is arranged in parallel with the outer side surface of the heating column (3), and the distance between the limit section and the heating column (3) is between one and two times the diameter of the graphene bonding silver wire.

6. A method for preparing graphene bonded silver wire according to claim 5, characterized in that: The guide section (10) is rotatably connected to an auxiliary air duct (11), and the air outlet of the auxiliary air duct (11) is arranged toward between the guide section (10) and the heating column (3); The lower end of the limiting section is connected to a limiting wedge (12), a spring 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 bonding silver wire is located on the upper side of the lower end of the limiting wedge (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 to an air inlet pipe (13), the bottom of the annealing device body (1) is connected to 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, and the support frame is used to connect the limit baffle (8).

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