Composite conductive wire and method for manufacturing the same
By galvanizing carbon fiber bundles and vacuum sintering them with copper powder, the problem of insufficient strength in conductive wires was solved, achieving a balance between high conductivity and high strength, reducing costs and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUODIAN SCI & TECH RES INST
- Filing Date
- 2023-12-29
- Publication Date
- 2026-06-23
AI Technical Summary
Existing conductive wires, while maintaining high conductivity, lack strength, are costly, and are prone to corrosion. Carbon fiber bundles, on the other hand, have poor conductivity and cannot meet practical needs.
The carbon fiber bundles are galvanized, immersed in a conductive binder, and then vacuum sintered and rolled. Copper powder is then incorporated to improve conductivity and strength, using a continuous production process.
This achieves a good balance between conductivity and strength in conductive wires, reduces manufacturing costs, and extends service life.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of conductive materials, and more specifically to a composite conductive wire and its preparation method. Background Technology
[0002] For conductive wires, improving their strength while maintaining high conductivity, and achieving a good match between their conductivity and mechanical properties (especially strength) has always been a key focus of conductive material research and a major issue in the production field.
[0003] Traditional conductive wires are primarily made of copper or aluminum. While copper and aluminum possess excellent conductivity, pure copper and aluminum have low tensile strength and tend to sag due to their own weight during use. Furthermore, using these materials presents problems such as high weight, high cost, and susceptibility to corrosion. Carbon fiber bundles, on the other hand, have garnered significant attention in the fields of composite materials and conductive materials due to their high strength, lightweight, and corrosion resistance. However, carbon fiber bundles themselves have poor conductivity, failing to meet the conductivity requirements of practical applications. Summary of the Invention
[0004] The purpose of this invention is to overcome the problem that existing technologies cannot simultaneously achieve both strength and conductivity, and to provide a composite conductive wire that has good strength and conductivity, while also having low manufacturing cost and long service life.
[0005] To achieve the above objectives, the present invention provides a method for preparing composite conductive wires, the method comprising the following steps:
[0006] (1) The carbon fiber bundle is drawn and immersed in the zinc plating solution and dried to obtain a zinc-plated carbon fiber bundle;
[0007] (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid and drawn through the copper powder pool, and then the first vacuum sintering is performed to obtain copper-coated galvanized carbon fiber bundle.
[0008] (3) The copper-coated zinc-coated carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering, and then rolled and finished.
[0009] Preferably, in step (1), the diameter of the carbon fiber bundle is 0.2-2 mm.
[0010] Preferably, in step (1), the traction rate is 50-200 mm / min.
[0011] Preferably, in step (1), the drying conditions include: a temperature of 100-200℃ and a time of 45-60min.
[0012] Preferably, in step (2), the traction rate is 50-200 mm / min.
[0013] Preferably, in step (2), the particle size of the copper powder is 0.01-0.1 mm.
[0014] Preferably, in step (2), the conditions for the first vacuum sintering include: a vacuum degree P1 in the range of 0 Pa < P1 < 1 Pa, a temperature of 100-250 °C, and a time of 45-60 min.
[0015] Preferably, in step (3), the conditions for the second vacuum sintering include: a vacuum degree P2 in the range of 0 Pa < P2 < 1 Pa, a temperature of 600-900 °C, and a time of 60-90 min.
[0016] Preferably, in step (3), the rolling conditions include: a temperature of 200-600℃ and a rolling deformation of 1-10%.
[0017] Preferably, the finishing conditions include a temperature of 200-600℃.
[0018] Preferably, the method further includes repeating step (2).
[0019] A second aspect of the present invention provides a composite conductive wire prepared by the above method.
[0020] Preferably, the diameter of the composite conductive wire is 2-20 mm.
[0021] Preferably, based on composite conductive wire, the volume content of the carbon fiber bundle is 1-20%.
[0022] Compared with the prior art, the technical solution of the present invention has the following advantages:
[0023] The composite conductive wire described in this invention has good conductivity and strength. This is mainly because the carbon fiber bundles can be well combined with copper powder after galvanizing. Under processes such as sintering and rolling, the carbon fiber bundles and metallic copper are tightly bonded, thereby improving the conductivity and strength of the conductive wire. At the same time, the preparation method described in this invention can realize the continuous production of composite conductive wires, and the preparation method is simple and efficient. Detailed Implementation
[0024] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.
[0025] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0026] This invention provides a method for preparing composite conductive wires, the method comprising the following steps:
[0027] (1) The carbon fiber bundle is drawn and immersed in the zinc plating solution and dried to obtain a zinc-plated carbon fiber bundle;
[0028] (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid and drawn through the copper powder pool, and then the first vacuum sintering is performed to obtain copper-coated galvanized carbon fiber bundle.
[0029] (3) The copper-coated zinc-coated carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering, and then rolled and finished.
[0030] In this invention, there are no special requirements for the zinc plating solution. Any zinc plating solution commonly used in the art is acceptable, as long as it can plate metallic zinc onto the surface of the carbon fiber bundle.
[0031] In this invention, there are no special requirements for the conductive adhesive liquid, as long as it can coat the copper powder onto the material processed in step (1). For example, it can be a copper-based conductive adhesive.
[0032] In a preferred embodiment, in order to improve the strength of the composite conductive wire, in step (1), the diameter of the carbon fiber bundle is 0.2-2mm; specifically, the diameter of the carbon fiber bundle can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm or 2mm.
[0033] In a preferred embodiment, in step (1), the traction rate is 50-200 mm / min, at which the zinc metal can be uniformly loaded on the surface of the carbon fiber bundle.
[0034] In a preferred embodiment, the drying conditions in step (1) include a temperature of 100-200°C and a time of 45-60 min; under these drying conditions, metallic zinc can be uniformly coated on the surface of the carbon fiber bundle.
[0035] In a specific implementation, in step (1), the drying temperature can be 100℃, 120℃, 140℃, 160℃, 180℃ or 200℃; the drying time can be 45min, 50min, 55min or 60min.
[0036] In a preferred embodiment, in step (2), the traction rate is 50-200 mm / min; at this traction rate, the conductive adhesive and copper powder can be uniformly coated on the material treated in step (1).
[0037] In a preferred embodiment, in order to improve the conductivity of the composite conductive wire, in step (2), the particle size of the copper powder is 0.01-0.1 mm; specifically, the particle size of the copper powder can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm.
[0038] In this invention, the "vacuum degree" refers to the "relative vacuum degree".
[0039] In a preferred embodiment, in step (2), the conditions for the first vacuum sintering include: a vacuum degree P1 in the range of 0 Pa < P1 < 1 Pa, a temperature of 100-250°C, and a time of 45-60 min; specifically, the vacuum degree can be 0.01 Pa, 0.02 Pa, 0.03 Pa, 0.04 Pa, 0.05 Pa, 0.06 Pa, 0.07 Pa, 0.08 Pa, or 0.09 Pa; the temperature can be 100°C, 120°C, 150°C, 160°C, 180°C, 200°C, 220°C, or 250°C; and the time can be 45 min, 50 min, 55 min, or 60 min.
[0040] In a preferred embodiment, in order to improve the strength of the composite conductive wire, the conditions for the second vacuum sintering in step (3) include: the vacuum degree P2 is in the range of 0 Pa < P2 < 1 Pa, the temperature is 600-900℃, and the time is 60-90 min; specifically, the vacuum degree can be 0.01 Pa, 0.02 Pa, 0.03 Pa, 0.04 Pa, 0.05 Pa, 0.06 Pa, 0.07 Pa, 0.08 Pa, or 0.09 Pa; the temperature can be 600℃, 650℃, 700℃, 720℃, 750℃, 780℃, 800℃, 850℃, or 900℃; and the time can be 60 min, 70 min, 80 min, or 90 min.
[0041] In a preferred embodiment, in order to improve the strength and conductivity of the composite conductive wire, the rolling conditions in step (3) include: a temperature of 200-600℃ and a rolling deformation of 1-10%; at the same time, the above rolling conditions can ensure that the carbon fiber bundle core is intact and does not break, which is beneficial to continuous production.
[0042] In specific embodiments, the rolling temperature can be 200℃, 300℃, 400℃, 420℃, 440℃, 460℃, 480℃, 500℃, or 600℃; the rolling deformation can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 7.5%, 8%, 9%, 9.5%, or 10%.
[0043] In this invention, "deformation during rolling" refers to "the percentage reduction in cross-section of the composite conductive wire after rolling relative to the cross-section of the composite conductive wire before rolling".
[0044] In a preferred embodiment, in order to improve the strength and conductivity of the composite conductive wire, the finishing conditions in step (3) include a temperature of 200-600℃; specifically, the finishing temperature can be 200℃, 300℃, 400℃, 420℃, 440℃, 460℃, 480℃, 500℃ or 600℃. Using the above finishing conditions can ensure that the carbon fiber bundle core is intact and does not break, which is beneficial to continuous production.
[0045] In a preferred embodiment, in order to further improve the strength and conductivity of the composite conductive wire, the method further includes repeating step (2) between step (2) and step (3).
[0046] The method described in this invention also includes repeating step (2), that is, repeating the copper coating process. There is no special requirement for the number of repetitions, as long as the diameter of the final composite conductive wire is within a suitable range. Preferably, the diameter of the composite conductive wire is 2-20 mm. The copper coating process is as follows: immersion in conductive adhesive liquid and traction through a copper powder pool, followed by a first vacuum sintering.
[0047] The composite conductive wire prepared by the above method has good conductivity and strength. This is mainly because the carbon fiber bundle can be well combined with copper powder after galvanizing. Through sintering, rolling and finishing processes, the carbon fiber bundle and metallic copper can be tightly bonded to improve the cohesion between the two, thereby improving the conductivity and strength of the conductive wire. At the same time, the preparation method described in this invention can realize continuous production and is simple and efficient.
[0048] A second aspect of the present invention provides a composite conductive wire prepared by the above method.
[0049] In a preferred embodiment, in order to improve the strength and conductivity of the composite conductive wire, the diameter of the composite conductive wire is 2-20 mm; specifically, the diameter of the composite conductive wire can be 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm or 20 mm.
[0050] In a preferred embodiment, in order to improve the strength of the composite conductive wire, the volume content of the carbon fiber bundle is 1-20% based on the composite conductive wire; specifically, the volume content of the carbon fiber bundle can be 1%, 1.5%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18% or 20%.
[0051] The following examples further illustrate the composite conductive wire and its preparation method according to the present invention. These examples are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following examples.
[0052] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.
[0053] Example 1
[0054] (1) A carbon fiber bundle with a diameter of 0.5 mm was drawn into the zinc plating solution at a rate of 100 mm / min, and then drawn out of the zinc plating solution at the same rate and dried. The drying temperature was 140℃ and the time was 50 min to obtain a zinc-plated carbon fiber bundle.
[0055] (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid at a speed of 100 mm / min and then drawn through the copper powder pool at the same speed. The copper powder in the copper powder pool has a particle size of 0.03 mm. Then, the first vacuum sintering is carried out in a low temperature heating chamber with a vacuum degree of 0.05 Pa and a temperature of 150 °C for 50 min to obtain copper-coated galvanized carbon fiber bundles. The above operation is repeated until the diameter of the copper-coated galvanized carbon fiber bundles is 4.2 mm.
[0056] (3) The copper-coated galvanized carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering in a high-temperature heating chamber with a vacuum degree of 0.05 Pa and a temperature of 720 °C. The second vacuum sintering time is 70 min. Then, they are rolled and finished by a rolling mill with a deformation of 9.3% and a rolling and finishing temperature of 400 °C to obtain a composite conductive wire with a diameter of 4 mm.
[0057] Example 2
[0058] (1) A carbon fiber bundle with a diameter of 0.6 mm was drawn into the zinc plating solution at a rate of 90 mm / min, and then drawn out of the zinc plating solution at the same rate and dried. The drying temperature was 150℃ and the time was 55 min to obtain a zinc-plated carbon fiber bundle.
[0059] (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid at a rate of 90 mm / min and then drawn through the copper powder pool at the same rate. The copper powder in the copper powder pool has a particle size of 0.04 mm. Then, a first vacuum sintering is performed in a low-temperature heating chamber with a vacuum degree of 0.04 Pa and a temperature of 160 °C. The first vacuum sintering time is 55 min, and copper-coated galvanized carbon fiber bundles are obtained. The above operation is repeated until the diameter of the copper-coated galvanized carbon fiber bundles is 5.2 mm.
[0060] (3) The copper-coated galvanized carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering in a high-temperature heating chamber with a vacuum degree of 0.04 Pa and a temperature of 750 °C. The second vacuum sintering time is 75 min. Then, the bundles are rolled and finished by a rolling mill with a deformation of 7.5% and a rolling and finishing temperature of 420 °C to obtain a composite conductive wire with a diameter of 5 mm.
[0061] Example 3
[0062] (1) A carbon fiber bundle with a diameter of 0.6 mm was drawn into the zinc plating solution at a rate of 110 mm / min, and then drawn out of the zinc plating solution at the same rate and dried. The drying temperature was 160℃ and the time was 60 min to obtain a zinc-plated carbon fiber bundle.
[0063] (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid at a rate of 110 mm / min and then drawn through the copper powder pool at the same rate. The copper powder in the copper powder pool has a particle size of 0.06 mm. Then, a first vacuum sintering is performed in a low-temperature heating chamber with a vacuum degree of 0.06 Pa and a temperature of 180 °C. The first vacuum sintering time is 60 min to obtain copper-coated galvanized carbon fiber bundles. The above operation is repeated until the diameter of the copper-coated galvanized carbon fiber bundles is 6.3 mm.
[0064] (3) The copper-coated zinc-coated carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering in a high-temperature heating chamber with a vacuum degree of 0.06 Pa and a temperature of 780 °C. The second vacuum sintering time is 80 min. Then, the bundles are rolled and finished by a rolling mill. The deformation of the rolling is 9.3%, and the rolling and finishing temperature is 450 °C to obtain a composite conductive wire with a diameter of 6 mm.
[0065] Example 4
[0066] The method of Example 3 was implemented, except that the diameter of the copper-coated galvanized carbon fiber bundle in step (2) was 9.2 mm, and the diameter of the composite conductive wire obtained in step (3) was 9 mm.
[0067] Comparative Example 1
[0068] The method of Example 1 is implemented, except that step (1) is omitted.
[0069] Comparative Example 2
[0070] The method of Example 1 is implemented, except that step (3) is omitted.
[0071] Test case
[0072] The strength and conductivity of the conductive composite wires prepared in Examples 1-4 above were tested, and the test results are shown in Table 1.
[0073] Table 1
[0074]
[0075] As can be seen from the results in Table 1, the composite wire in Comparative Example 1 is missing step (1) and cannot be formed, resulting in the inability to measure both strength and conductivity. Similarly, the composite wire in Comparative Example 2 is missing step (3) and cannot be formed, resulting in the inability to measure both strength and conductivity. However, the composite conductive wire prepared by the method described in this invention has both good strength and conductivity, with a maximum strength of 680 MPa and a conductivity of 95% or higher, and can be used as a good conductive material.
[0076] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A method for preparing composite conductive wires, characterized in that, The method includes the following steps: (1) The carbon fiber bundle is drawn and immersed in the zinc plating solution and dried to obtain a zinc-plated carbon fiber bundle; (2) The galvanized carbon fiber bundle obtained in step (1) is drawn into the conductive adhesive liquid and drawn through the copper powder pool, and then the first vacuum sintering is performed to obtain copper-coated galvanized carbon fiber bundle. (3) The copper-coated galvanized carbon fiber bundles obtained in step (2) are subjected to a second vacuum sintering, and then rolled and finished. In step (2), the conditions for the first vacuum sintering include: the vacuum degree P1 is in the range of 0 Pa < P1 < 1 Pa, the temperature is 100-250℃, and the time is 45-60 min; In step (3), the conditions for the second vacuum sintering include: the vacuum degree P2 is in the range of 0 Pa < P2 < 1 Pa, the temperature is 600-900℃, and the time is 60-90 min.
2. The method according to claim 1, characterized in that, In step (1), the diameter of the carbon fiber bundle is 0.2-2 mm.
3. The method according to claim 1 or 2, characterized in that, In step (1), the traction rate is 50-200 mm / min.
4. The method according to claim 1 or 2, characterized in that, In step (1), the drying conditions include a temperature of 100-200℃ and a time of 45-60min.
5. The method according to claim 1, characterized in that, In step (2), the traction rate is 50-200 mm / min.
6. The method according to claim 5, characterized in that, In step (2), the particle size of the copper powder is 0.01-0.1 mm.
7. The method according to claim 1, characterized in that, In step (3), the rolling conditions include: a temperature of 200-600℃ and a rolling deformation of 1-10%.
8. The method according to claim 1, characterized in that, The conditions for finishing include a temperature of 200-600℃.
9. The method according to claim 1, characterized in that, The method also includes repeating step (2).
10. The composite conductive wire prepared by the method of any one of claims 1-9.
11. The composite conductive wire according to claim 10, characterized in that, The diameter of the composite conductive wire is 2-20 mm.
12. The composite conductive wire according to claim 11, characterized in that, Based on composite conductive wire, the volume content of the carbon fiber bundle is 1-20%.