Highly conductive carbon fiber composite material and method for producing the same

Abstract

The application discloses a kind of high-conductive carbon fiber composite materials and preparation method thereof, high-conductive carbon fiber composite material includes composite material matrix and the conductive layer on the surface of composite material matrix, the material of conductive layer is metal;Composite material matrix is obtained after first ply and second ply are sequentially laid, and is formed by processing;First ply at least includes a first prepreg, and second ply at least includes a second prepreg;First prepreg is made by carbon fiber and conductive resin mixing, and second ply is made by metallized carbon fiber and conductive resin mixing, wherein, metallized carbon fiber is carbon fiber with metal plating on surface, and conductive layer is arranged on the surface of second ply.The carbon fiber composite material of the application uses metallized carbon fiber and conductive resin in matrix, greatly improves the conductive performance to meet the demand of static protection and lightning protection, while retaining the advantage of lightweight and high-strength of carbon fiber composite material, and the combination between materials is stable, and the mechanical property is stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber composite materials technology, and specifically to a highly conductive carbon fiber composite material and its preparation method. Background Technology

[0002] Carbon fiber composites have significant application value in meeting the lightweight development needs of the aerospace industry and are widely used in the manufacture of various aerospace components. However, the resin matrix used in most current carbon fiber composites is an insulating material, resulting in inherently insufficient electrical conductivity. This leads to a significant gap compared to metallic materials in terms of electrostatic protection, lightning strike protection, and other safety performance aspects, making it difficult to meet the comprehensive performance requirements of materials in the aerospace field.

[0003] To improve the electrical conductivity of carbon fiber composites, existing solutions mainly include laying copper mesh, bonding copper foil, and applying coatings or inks on the composite surface. However, the material differences between copper mesh, copper foil, and other metallic materials and carbon fiber composites are significant, resulting in poor interfacial compatibility. Under long-term use or environmental influences, delamination is highly likely, severely impacting the structural stability and lifespan of the material. Furthermore, copper mesh and foil themselves have a certain weight, significantly increasing the overall mass of the composite product. Adding a metal layer only improves conductivity locally, failing to create a uniform conductive path, thus limiting the overall conductivity of the composite and making it difficult to meet the conductivity standards required for electrostatic discharge protection and lightning strike protection. Coatings or inks, on the other hand, lack fiber reinforcement, resulting in poor mechanical properties and susceptibility to cracking under external forces, leading to conductive failure. Similarly, they fail to meet the stringent reliability requirements of the aerospace industry.

[0004] Therefore, how to effectively address the deficiencies and shortcomings of existing technologies has become an important issue that researchers in this field urgently need to solve. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a highly conductive carbon fiber composite material and its preparation method.

[0006] The technical solution of the present invention is: a highly conductive carbon fiber composite material, comprising a composite matrix and a conductive layer located on the surface of the composite matrix, wherein the conductive layer is made of metal;

[0007] The composite matrix is ​​obtained by sequentially laying a first ply and a second ply, followed by molding. The first ply includes at least one layer of first prepreg, and the second ply includes at least one layer of second prepreg. The first prepreg is made of carbon fiber and conductive resin, and the second prepreg is made of metallized carbon fiber and conductive resin. The metallized carbon fiber is carbon fiber with a metal coating on its surface, and the conductive layer is disposed on the surface of the second ply.

[0008] As an improvement of this embodiment of the invention, the conductive resin is a conductive modified resin system, including at least one of conductive epoxy resin, conductive bismaleimide resin, and conductive unsaturated resin.

[0009] As an improvement of this embodiment of the invention, the material of the metal coating includes one or more combinations of silver, copper, nickel, and aluminum.

[0010] As an improvement of this invention, the metal component in the metallized carbon fiber accounts for 30% to 70% by mass.

[0011] As an improvement of this invention, the metal coating of the metallized carbon fiber is further doped with auxiliary materials for improving electrical conductivity or magnetic permeability.

[0012] As an improvement of this embodiment of the invention, the material of the conductive layer includes at least one of copper, silver, zinc, nickel, chromium, and aluminum.

[0013] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a method for preparing a highly conductive carbon fiber composite material, which includes the following steps: S1: Preparation of metallized carbon fibers; S2: A first prepreg is prepared by mixing conductive resin and carbon fiber, and a second prepreg is prepared by mixing conductive resin and the metallized carbon fiber. S3: Lay the first prepreg to form a first layup, lay the second prepreg on the first layup to form a second layup, and perform molding treatment on the first layup and the second layup to obtain a composite matrix; S4: Deposit metal on the surface of the second layup of the composite matrix to form a conductive layer.

[0014] As an improvement to this embodiment of the invention, the metallized carbon fiber in step S1 is prepared by one of chemical plating, electroplating, or physical vapor deposition.

[0015] As an improvement to this embodiment of the invention, the molding process in step S3 adopts one of the following processes: vacuum bag pressing, prepreg molding, autoclave, or vacuum bag packaging followed by oven curing.

[0016] As an improvement to this embodiment of the invention, the conductive layer in step S4 is formed by one of electroplating, electroless plating, sputtering, or spraying.

[0017] The high conductivity carbon fiber composite material and its preparation method provided in this invention have the following advantages: the carbon fiber composite material of this invention uses metallized carbon fiber and conductive resin in the matrix, which greatly improves the conductivity to meet the requirements of electrostatic protection and lightning protection, while retaining the advantages of lightweight and high strength of carbon fiber composite material to the greatest extent, and the material bonding is stable and the mechanical properties are stable and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the high conductivity carbon fiber composite material described in this invention; Figure 2 This is a schematic diagram of the preparation method of the high conductivity carbon fiber composite material described in this invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0020] If the present invention involves orientation (e.g., up, down, left, right, front, back, outside, inside, etc.) when described, then the orientations involved need to be defined.

[0021] The scope of the embodiments described herein includes the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitations, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably.

[0022] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this document and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements, or direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] The present invention provides a highly conductive carbon fiber composite material, comprising a composite matrix 1 and a conductive layer 2 located on the surface of the composite matrix 1, wherein the conductive layer 2 is made of metal; The composite matrix 1 is obtained by sequentially laying a first ply and a second ply, followed by molding. The first ply includes at least one layer of first prepreg, and the second ply includes at least one layer of second prepreg. The first prepreg is made of carbon fiber and conductive resin, and the second prepreg is made of metallized carbon fiber and conductive resin. The metallized carbon fiber is carbon fiber with a metal coating on its surface, and the conductive layer 2 is disposed on the surface of the second ply.

[0024] Here, the first and second plies are defined only by the difference in material composition, and are not limited to a single ply structure. They can be set as a multi-layer stacked structure according to the actual conductivity and mechanical performance requirements. In addition, the resin in the first ply can also be an ordinary resin. Preferably, the resin in the first ply of the present invention is a conductive resin. It can be understood that using conductive resin for both the first and second plies can enhance conductivity. The structural feature of the metallized carbon fiber is a carbon fiber substrate with a uniformly coated metal layer on its surface. During the molding and curing process of the composite matrix, the metal coating on the surface of the metallized carbon fiber will interact with the conductive resin at the interface. The active sites on the surface of the metal coating can form chemical bonds with the resin molecules. At the same time, the metal coating and the conductive resin are tightly bonded by intermolecular forces, so that the metallized carbon fiber and the conductive resin are not simply physically mixed, but form a stable integrated structure.

[0025] Table 1 Performance test data of metallized carbon fibers with different metal mass ratios

[0026] The substrate can be continuous PAN-based carbon fiber, and the surface metal coating can be one or a combination of silver, copper, nickel, and aluminum. The metal component in the metallized carbon fiber accounts for 30% to 70% by mass, as shown in Table 1. Experimental verification shows that too low a proportion leads to insufficient improvement in conductivity, failing to meet application requirements; too high a proportion increases material density, weakening the lightweight advantage of carbon fiber composites and potentially affecting the material's mechanical toughness. A moderate proportion achieves a balance between conductivity and lightweight, high-strength characteristics. The metal coating must possess excellent uniformity and adhesion stability, forming a strong bond with the carbon fiber substrate to prevent interface separation during composite molding and subsequent use. It is understood that, in terms of performance, the conductivity of metallized carbon fiber is far superior to that of ordinary carbon fiber, significantly improving the conductivity of the second layup in the composite material, thereby enhancing the conductivity continuity of the entire composite matrix. Simultaneously, metallized carbon fiber retains the original high strength and lightweight characteristics of carbon fiber, and the second layup formed after compounding with conductive resin can construct an efficient conductive pathway while ensuring the mechanical properties of the composite material. In the composite material structure system, metallized carbon fiber is compounded with conductive resin in a preset ratio to form a second layup. This second layup is then laid on the surface of the first layup and cured, firmly bonding with the first layup to form the composite matrix 1. Through its own structural characteristics, the bonding force between the layers of the matrix is ​​enhanced, reducing interfacial resistance and meeting the requirements for high conductivity and high stability.

[0027] In some specific embodiments, the metal coating of the metallized carbon fiber is further doped with auxiliary materials to improve its electrical conductivity or magnetic permeability. In practice, the auxiliary materials are dispersed uniformly within the metal coating, fusing and bonding with the main metal of the coating. This process neither damages the overall structural integrity of the metal coating nor affects the bonding strength between the metal coating and the carbon fiber substrate, thereby improving the electrical conductivity or magnetic permeability of the metal coating. The doping ratio can be adjusted according to actual performance requirements.

[0028] To address the need for improved conductivity, the selected auxiliary materials are functional materials with excellent conductivity properties. Specifically, these auxiliary materials can include silver powder, copper powder, and graphene. Silver powder possesses excellent conductivity; when doped into metal coatings, it effectively reduces the overall resistivity of the coating, decreases energy loss during charge transport, and significantly improves the conductivity efficiency and stability of metallized carbon fibers. Copper powder exhibits excellent conductivity and is more cost-effective; its doping can optimize the charge conduction capability of metal coatings while maintaining cost-effectiveness. Graphene possesses high carrier mobility, further enhancing the upper limit of conductivity performance of metallized carbon fibers.

[0029] To address the need for improved magnetic permeability, the selected auxiliary materials are functional materials with excellent magnetic permeability. Specifically, these auxiliary materials can include iron powder, nickel powder, and cobalt powder. Iron powder possesses excellent soft magnetic properties; doping it into a metal coating can effectively optimize the coating's permeability and enhance the metallized carbon fiber's response to and conduction of magnetic fields. Nickel powder exhibits stable magnetic permeability and good compatibility with the metal coating; doping it can improve the magnetic permeability and stability of the metallized carbon fiber while ensuring the stability of the coating structure. Cobalt powder possesses high saturation magnetization; doping it can further enhance the magnetic permeability of the metallized carbon fiber.

[0030] In practice, auxiliary materials for improving conductivity or magnetic permeability can be doped alone; alternatively, both conductive and magnetically permeable auxiliary materials can be doped simultaneously, depending on the overall electromagnetic performance requirements. By adjusting the doping ratio, particle size, and dispersion uniformity of various auxiliary materials, the conductivity and magnetic permeability of metallized carbon fibers can be optimized.

[0031] In some specific embodiments, the conductive resin is a conductive modified resin system. The conductive modified resin system is a resin system with stable conductive properties formed by modifying the base material with various resins through a conductive modification process. While retaining the basic characteristics of the resin base material itself, such as molding and processing performance, mechanical properties, weather resistance, and bonding performance, the resin system is endowed with good conductivity through modification.

[0032] Specifically, the conductive resin can be at least one of conductive epoxy resin, conductive bismaleimide resin, and conductive unsaturated resin. Conductive epoxy resin uses epoxy resin as the base material and incorporates conductive fillers through a conductive modification process to achieve conductivity. Commonly used conductive fillers include metal powders, such as silver powder, copper powder, and nickel powder, and carbon-based materials, such as conductive carbon black, graphene, and carbon nanotubes. The fillers are uniformly dispersed in the epoxy resin matrix to form continuous conductive pathways. Conductive bismaleimide resin is a high-performance conductive resin system formed by conductive modification of bismaleimide resin as the base material, constructing a conductive network by adding conductive fillers. Bismaleimide resin has advantages such as high temperature resistance, high mechanical strength, radiation resistance, and resistance to damp heat aging. After conductive modification, conductive bismaleimide resin retains these core characteristics while also gaining good conductivity. Conductive unsaturated resin is a resin system formed by conductive modification of unsaturated polyester resin as the base material, possessing both conductivity and molding advantages. The modification principle is to uniformly mix conductive fillers into unsaturated polyester resin. Common conductive fillers include carbon-based materials, metal powders, or composite conductive fillers. By optimizing the filler dispersion process, the filler forms a continuous conductive path in the resin matrix, thereby obtaining stable conductivity.

[0033] In some specific embodiments, the material of the conductive layer 2 includes at least one of copper, silver, zinc, nickel, chromium, and aluminum. Copper, with its excellent conductivity, good ductility, and readily available raw materials, is a commonly used basic material for preparing the conductive layer 2. Silver has excellent conductivity, low resistivity, and excellent chemical stability, resulting in low charge transport loss and long-lasting stable conductivity. Zinc has good conductivity and outstanding corrosion resistance, with excellent coating adhesion, enabling it to resist erosion in complex environments with humid and corrosive media, extending the service life of the conductive layer 2. Nickel has stable conductivity, high hardness, and excellent wear resistance, effectively resisting physical damage caused by mechanical friction and impact, maintaining the integrity of the structure and performance of the conductive layer 2. Chromium possesses good conductivity and high ductility, making it a commonly used basic material for preparing the conductive layer 2. The conductive layer has excellent electrical conductivity, and its surface easily forms a dense and stable passivation film, exhibiting outstanding corrosion and oxidation resistance. Furthermore, the coating boasts high smoothness and surface hardness, maintaining stable performance even in harsh environments such as high temperatures and strong corrosion. Aluminum also possesses excellent electrical conductivity, is lightweight, and has a low density. Its surface can form an oxide film that provides some corrosion resistance. In actual preparation, a single metal material can be selected to prepare the conductive layer 2 based on factors such as the application scenario, performance requirements, operating conditions, and cost control. Alternatively, multiple metal materials can be combined to achieve properties such as conductivity, corrosion resistance, wear resistance, and lightweighting through the complementary properties of different metal materials.

[0034] This invention also provides a method for preparing a highly conductive carbon fiber composite material, used to prepare the highly conductive carbon fiber composite material as described in any of the preceding claims, comprising the following steps: S1: Preparation of metallized carbon fibers; specifically, the metallized carbon fibers are prepared by one of chemical plating, electroplating or physical vapor deposition.

[0035] Here, if a chemical plating process is used, the carbon fiber substrate is first pretreated to remove impurities and oxide layers. Then, the pretreated carbon fiber substrate is immersed in a chemical plating solution containing metal ions. Through a redox reaction, the metal ions are uniformly deposited on the carbon fiber surface, forming a continuous and dense metal coating. If an electroplating process is used, the carbon fiber substrate is fixed as the cathode, and a corresponding metal material is selected as the anode. It is placed in an electroplating solution containing the target metal ions, and a stable DC electric field is applied to cause the target metal ions to be directionally deposited on the carbon fiber surface, forming a uniform coating. If a physical vapor deposition process is used, methods such as vacuum evaporation sputtering or ion plating can be selected. In a high-vacuum environment, the target metal source is heated and evaporated or sputtered into gaseous atoms or ions by high-energy particle bombardment. These particles are deposited on the surface of the carbon fiber substrate to form a metal coating.

[0036] S2: A first prepreg is prepared by mixing conductive resin and carbon fiber, and a second prepreg is prepared by mixing conductive resin and the metallized carbon fiber. Here, in preparing the first prepreg, conventional carbon fiber is selected as the reinforcement and conductive resin as the matrix material. The carbon fiber and conductive resin are mixed in a preset ratio, and the conductive resin is uniformly impregnated into the carbon fiber through impregnation coating or other methods. Subsequently, the volatile components in the resin are removed by drying treatment to obtain the first prepreg with uniform resin content. In preparing the second prepreg, the metallized carbon fiber prepared in step S1 is used as the reinforcement, and the same conductive resin as or with good compatibility with the first prepreg is selected as the matrix material. The same preparation process as the first prepreg is adopted to fully impregnate and mix the metallized carbon fiber and conductive resin, and the second prepreg is obtained after drying treatment.

[0037] S3: Lay the first prepreg to form a first layup, lay the second prepreg on the first layup to form a second layup, and perform molding treatment on the first layup and the second layup to obtain composite matrix 1; In practice, the first prepreg is laid in a preset layup direction and number of layers to form the first layup. The first layup serves as the base layer of the composite material and provides structural strength support. The second prepreg is then uniformly laid on the surface of the first layup to form the second layup. The second layup provides an initial conductive path for the material through the presence of metallized carbon fibers. During the layup process, it is necessary to ensure that each layer of prepreg is tightly bonded and free from defects such as bubbles, wrinkles, or gaps.

[0038] S4: A conductive layer 2 is formed by depositing metal on the surface of the second layup of the composite matrix 1. Specifically, the conductive layer 2 is formed by one of electroplating, electroless plating, sputtering, or spraying.

[0039] In practice, the exposed metal coating of the metallized carbon fibers on the surface of the second layup provides a good conductive substrate and bonding sites for the deposition of the conductive layer 2, enabling the outer metal to achieve efficient bonding with the composite matrix and avoiding delamination failure.

[0040] In practice, if electroplating is used, the composite material matrix 1 is used as the cathode, the target metal is selected as the anode, and it is placed in an electroplating solution containing the target metal ions, with appropriate electric field parameters applied. The metal coating of the metallized carbon fiber on the second layup surface acts as a conductive medium, guiding the directional migration and deposition of metal ions. During the deposition process, the metal ions and the metal coating form a metallurgical bond, making the conductive layer 2 tightly connected to the composite material matrix 1, forming a continuous conductive structure. If chemical plating is used, the surface of the second layup of the composite material matrix 1 is activated to remove the surface oxide film and form catalytic active sites. Then, the composite material matrix 1 is immersed in a chemical plating solution containing the target metal ions. The metal coating of the metallized carbon fiber enhances the catalytic activity, promoting the deposition of metal ions through autocatalytic reactions. The deposited metal forms a strong bond with the metal coating, ensuring the structural stability and conductive continuity of the conductive layer 2. If sputtering is used, in a high vacuum environment, the target metal is used as the target material, and high-energy particles bombard the target material, causing metal atoms or ions to be sputtered and deposited on the surface of the second layup. The sputtered target metal atoms or ions can undergo atomic diffusion with the metal coating of the metallized carbon fibers on the second layup surface, forming a metallurgical bonding interface, thereby forming a dense, uniform, and firmly bonded conductive layer 2, effectively preventing the conductive layer 2 from detaching. If a spraying process is used, the target metal powder or slurry is atomized by a spraying device and sprayed at high speed onto the surface of the second layup. After drying or sintering, the conductive layer 2 is formed. During sintering, the target metal powder or slurry fuses with the metal coating of the metallized carbon fibers on the second layup surface, forming a stable bonding interface. Simultaneously, the metal particles interconnect to form a continuous conductive network, ensuring the conductivity and mechanical reliability of the conductive layer 2.

[0041] In some specific implementations, the molding process in step S3 employs one of the following methods: vacuum bag pressing, prepreg molding, autoclave, or vacuum bagging followed by oven curing.

[0042] Here, if a vacuum bag pressing process is used, the prepreg assembly after layup is sealed in a vacuum bag, and a vacuum pump is used to evacuate the prepreg assembly, subjecting it to uniform pressure in a vacuum environment while heating it to the resin curing temperature. This is then maintained at temperature and pressure for a certain time to allow the resin to fully cure and obtain the composite matrix 1. If a prepreg molding process is used, the prepreg assembly after layup is placed in a mold of a pre-designed shape, and a molding machine is used to apply a certain pressure and temperature to form and cure the prepreg assembly within the mold. The pressure and temperature parameters need to be adjusted according to the resin's curing characteristics to ensure complete resin curing and obtain the composite matrix 1. If an autoclave process is used, the sealed prepreg assembly is placed in an autoclave, and compressed gas is introduced into the autoclave to provide uniform pressure while simultaneously raising the temperature, allowing the prepreg to cure and form under high temperature and high pressure. If a vacuum bag followed by oven curing process is used, the prepreg assembly is first vacuum-packed and compacted in a vacuum bag, then placed in an oven, and heated, maintained, and cooled according to a pre-designed curing curve to allow the resin to cure and form the composite matrix 1.

[0043] Table 2 Performance data of carbon fiber composites made with different combinations

[0044] As shown in Table 2, the high-conductivity carbon fiber composite material of the present invention retains the advantages of lightweight and high strength of carbon fiber composite materials. Through the synergistic effect of conductive resin, metallized carbon fiber and surface conductive layer, a continuous and efficient conductive path is constructed, which greatly improves the conductivity. At the same time, it solves the problems of delamination, weight increase and limited conductivity in traditional conductive reinforcement schemes. It can be used in aerospace and other fields that have dual requirements for material lightweighting and conductivity.

[0045] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly conductive carbon fiber composite material, characterized in that, It includes a composite material matrix (1) and a conductive layer (2) located on the surface of the composite material matrix (1), wherein the material of the conductive layer (2) is metal; The composite matrix (1) is obtained by sequentially laying a first ply and a second ply and then molding it; the first ply includes at least one first prepreg and the second ply includes at least one second prepreg; the first prepreg is made of carbon fiber and conductive resin, and the second prepreg is made of metallized carbon fiber and conductive resin, wherein the metallized carbon fiber is carbon fiber with a metal coating on its surface, and the structural feature of the metallized carbon fiber is a carbon fiber substrate with a uniform metal coating on its surface, and the mass ratio of the metal component in the metallized carbon fiber is 30%~70%, and the conductive layer (2) is disposed on the surface of the second ply.

2. The highly conductive carbon fiber composite material according to claim 1, characterized in that, The conductive resin is a conductive modified resin system, including at least one of conductive epoxy resin, conductive bismaleimide resin, and conductive unsaturated resin.

3. The highly conductive carbon fiber composite material according to claim 1, characterized in that, The material of the metal coating includes one or more combinations of silver, copper, nickel, and aluminum.

4. The highly conductive carbon fiber composite material according to claim 1, characterized in that, The metallized carbon fiber also contains auxiliary materials to improve its electrical conductivity or magnetic permeability.

5. The high conductivity carbon fiber composite material according to claim 1, characterized in that, The conductive layer (2) is made of at least one of copper, silver, zinc, nickel, chromium, and aluminum.

6. A method for preparing a highly conductive carbon fiber composite material, used to prepare the highly conductive carbon fiber composite material as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1: Preparation of metallized carbon fibers; S2: A first prepreg is prepared by mixing conductive resin and carbon fiber, and a second prepreg is prepared by mixing conductive resin and the metallized carbon fiber. S3: Lay the first prepreg to form a first ply, lay the second prepreg on the first ply to form a second ply, and perform molding treatment on the first ply and the second ply to obtain a composite matrix (1). S4: Deposit metal on the second layup surface of the composite matrix (1) to form a conductive layer (2).

7. The method for preparing the highly conductive carbon fiber composite material according to claim 6, characterized in that, The metallized carbon fiber in step S1 is prepared by one of chemical plating, electroplating, or physical vapor deposition.

8. The method for preparing the highly conductive carbon fiber composite material according to claim 6, characterized in that, The molding process in step S3 adopts one of the following processes: vacuum bag pressing, prepreg molding, autoclave, or vacuum bag packaging followed by oven curing.

9. The method for preparing the highly conductive carbon fiber composite material according to claim 6, characterized in that, In step S4, the conductive layer (2) is formed by one of electroplating, electroless plating, sputtering or spraying.

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