Preparation method of copper-zinc composite alloy added with carbon fibers

Abstract

The invention discloses a preparation method of a copper-zinc composite alloy added with carbon fibers, and belongs to the technical field of copper alloys. The preparation method comprises the following steps: S101, mixing carbon fibers with a zinc source, and then carrying out ball milling at high temperature, so that the carbon fibers fully react with zinc to form a zinc-based compound; s102, taking a zinc-based mixture containing a zinc-based compound and a zinc source as an intermediate, adding a copper source, and then carrying out ball milling at high temperature, so that the zinc-based compound and copper are metallurgically bonded to form a copper-zinc mixture; s103, the copper-zinc mixture is repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatment and then is subjected to extrusion forming; and S104, subsequent heat treatment is conducted, and the copper-zinc composite alloy added with the carbon fibers is obtained. According to the preparation method disclosed by the invention, the existence form of zinc is stabilized by forming a zinc-based compound (ZnC8) in the intermediate, and separation and volatilization of zinc at high temperature are avoided, so that uniform mixing of copper and zinc is realized.

Description

Technical Field

[0001] This invention belongs to the field of copper alloy technology, and specifically relates to a method for preparing a copper-zinc composite alloy with added carbon fiber. Background Technology

[0002] Copper-based alloys possess excellent electrical and thermal conductivity, as well as corrosion resistance, making them widely used in the electronics and electrical industries, particularly in connectors, lead terminals, switches, and other electronic components. With technological advancements, electronic components are becoming increasingly miniaturized and lightweight, resulting in higher current densities during operation. This, coupled with the resulting heat generation, necessitates longer service life under high-temperature conditions, placing significant demands on the electrical conductivity and high-temperature resistance of materials.

[0003] In existing technologies, the manufacture of copper-zinc alloys mainly relies on traditional smelting and casting methods. Typically, copper and zinc are melted at high temperatures and mixed to form an alloy. However, these methods face the following problems: First, zinc is prone to segregation in the molten state, which can lead to inhomogeneity in the alloy composition; second, phase separation may occur within the alloy, affecting the material's strength and electrical conductivity; finally, traditional methods usually require complex stirring and processing steps to ensure uniform mixing of zinc and copper, which not only increases production costs but may also reduce production efficiency.

[0004] Therefore, developing a low-cost, short-process preparation method for high-strength, high-conductivity copper-zinc alloys is of great significance for the engineering applications of copper alloys. Summary of the Invention

[0005] Based on this, and to address the shortcomings of the existing technology, a method for preparing a copper-zinc composite alloy with added carbon fibers is proposed.

[0006] To achieve the above objectives, the following technical solution is adopted: This invention provides a method for preparing a copper-zinc composite alloy with added carbon fibers, comprising the following steps: S101. Mix carbon fiber with zinc source, and then ball mill at high temperature to allow carbon fiber and zinc to fully react and form zinc-based compound; S102. A zinc-based mixture containing a zinc-based compound and a zinc source is used as an intermediate. A copper source is added, and then the mixture is ball-milled at high temperature to allow the zinc-based compound and copper to undergo metallurgical bonding to form a copper-zinc mixture. S103. The copper-zinc mixture is repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatments before being extruded and molded. S104, after subsequent heat treatment, a copper-zinc composite alloy with added carbon fiber is obtained.

[0007] In some embodiments, the zinc source is 500-mesh zinc powder with a purity of 99.9%; the copper source is 500-mesh copper powder with a purity of 99.9%; and the carbon fiber is 1000-mesh carbon fiber with a purity of 99.9%.

[0008] In some embodiments, the volume percentage of carbon fiber to zinc powder is (1:1) to (4:1).

[0009] In some embodiments, in step S101, the ball milling process is as follows: carbon fiber and zinc source are placed in a ball milling container at 500~700℃, anhydrous ethanol is added, the container is sealed, and a low-pressure inert gas is introduced for ball milling. The ball milling speed is 80~500 r / min, the ball milling time is 3~6 h, and the pressure of the inert gas is 0.1~0.9 MPa.

[0010] In some embodiments, in step S101, after ball milling, the product is dried to obtain a zinc-based compound, wherein the zinc-based compound is ZnC8.

[0011] In some embodiments, in step S102, the mass percentage of zinc-based mixture to copper powder is (3:97) to (6:94).

[0012] In some embodiments, in step S102, the ball milling process is as follows: at 500~700°C, the zinc-based mixture and the copper source are placed in a ball milling container, anhydrous ethanol is added, the container is sealed, and a low-pressure inert gas is introduced for ball milling. The ball milling speed is 80~500 r / min, the ball milling time is 0.1~1 h, and the pressure of the inert gas is 0.1~0.2 MPa.

[0013] In some embodiments, in step S103, the copper-zinc mixture is then repeatedly subjected to hot isostatic pressing and cold isostatic pressing at 500~700°C; the hot isostatic pressing temperature is 1000~2000°C and the pressure is 100~200 MPa; the cold isostatic pressing temperature is 20~40°C and the pressure is 100~200 MPa.

[0014] In some embodiments, in step S103, the extrusion molding process includes: a copper-zinc mixture is fed into a continuous extruder through a powder feeding mechanism, the extrusion roller speed is 5~15 r / min, the extrusion temperature is 360~530℃, and a copper-zinc composite alloy rod with added carbon fiber and metallurgical bonding surface is formed, with a diameter of 20~40 mm.

[0015] In some embodiments, in step S104, the temperature of the subsequent heat treatment is 200~400°C.

[0016] The present invention has the following beneficial technical effects: The method for preparing the copper-zinc composite alloy with added carbon fibers of the present invention stabilizes the zinc's form by forming a zinc-based compound (ZnC8) in the intermediate, preventing zinc from separating and volatilizing at high temperatures, thereby achieving a uniform mixing of copper and zinc. This preparation method requires no complex stirring, has a short process, low cost, and produces a composite alloy with high strength, high conductivity, and excellent wear resistance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the preparation method of the copper-zinc composite alloy with added carbon fiber according to the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0020] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0021] In view of the above objectives, a first aspect of the present invention provides a method for preparing a copper-zinc composite alloy with added carbon fibers. Figure 1 The diagram shown is a schematic flowchart of the method.

[0022] The preparation method of copper-zinc composite alloy with added carbon fiber includes the following steps: S101. Mix carbon fiber with zinc source, and then ball mill at high temperature to allow carbon fiber and zinc to fully react and form zinc-based compound; S102. A zinc-based mixture containing a zinc-based compound and a zinc source is used as an intermediate. A copper source is added, and then the mixture is ball-milled at high temperature to allow the zinc-based compound and copper to undergo metallurgical bonding to form a copper-zinc mixture. S103. The copper-zinc mixture is repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatments before being extruded and molded. S104, after subsequent heat treatment, a copper-zinc composite alloy with added carbon fiber is obtained.

[0023] In a preferred embodiment of the present invention, the zinc source is 500-mesh zinc powder with a purity of 99.9%; the copper source is 500-mesh copper powder with a purity of 99.9%; and the carbon fiber is 1000-mesh carbon fiber with a purity of 99.9%. The zinc powder, copper powder, and carbon fiber are all stored using a wet process.

[0024] In a preferred embodiment of the present invention, carbon fiber is added to an excess of zinc powder; the volume percentage of carbon fiber to zinc powder is (1:1) to (4:1).

[0025] In a preferred embodiment of the present invention, in step S101, the ball milling process is as follows: carbon fiber and zinc source are placed in a ball milling container at 500~700℃, anhydrous ethanol is added, the container is sealed, and a low-pressure inert gas is introduced for thorough ball milling. The ball milling speed is 80~500 r / min, the ball milling time is 3~6 h, and the pressure of the inert gas is 0.1~0.9 MPa. Preferably, the ball milling container can be a ball milling jar. Preferably, argon can be selected as the inert gas.

[0026] In a preferred embodiment of the present invention, in step S101, after ball milling, the product is dried to obtain a zinc-based compound, which is ZnC8. Through continuous impact and collision between the zinc powder, the carbon fiber, and the container wall, the carbon fiber and zinc react fully to form a uniform zinc-based compound (ZnC8). The zinc-based mixture is a mixture formed by the zinc-based compound (ZnC8) and excess unreacted zinc powder (ZnC8 / Zn mixture).

[0027] In a preferred embodiment of the present invention, in step S102, the mass percentage of the zinc-based mixture (ZnC8 / Zn mixture) to the copper powder is (3:97) to (6:94).

[0028] In a preferred embodiment of the present invention, in step S102, the ball milling process is as follows: A zinc-based mixture and a copper source are placed in a ball milling container at 500-700°C, anhydrous ethanol is added, the container is sealed, and a low-pressure inert gas is introduced for ball milling. The ball milling speed is 80-500 r / min, the ball milling time is 0.1-1 h, and the inert gas pressure is 0.1-0.2 MPa. Preferably, argon can be selected as the inert gas.

[0029] In a preferred embodiment of the present invention, in step S103, the copper-zinc mixture is subsequently subjected to repeated hot isostatic pressing and cold isostatic pressing treatments at 500~700°C; the hot isostatic pressing treatment temperature is 1000~2000°C and the pressure is 100~200 MPa; the cold isostatic pressing treatment temperature is 20~40°C and the pressure is 100~200 MPa; the hot isostatic pressing and cold isostatic pressing treatments are repeated 4~5 times.

[0030] In a preferred embodiment of the present invention, step S103 includes the following steps: a copper-zinc mixture is fed into a continuous extruder through a powder feeding mechanism, the extrusion roller speed is 5~15 r / min, the extrusion temperature is 360~530℃, and a copper-zinc composite alloy rod with added carbon fiber and metallurgical bonding surface is formed, with a diameter of 20~40 mm.

[0031] In a preferred embodiment of the present invention, in step S104, the temperature of the subsequent heat treatment is 200~400°C.

[0032] The copper-zinc composite alloy with added carbon fibers obtained by the preparation method of the present invention has high strength and improved work hardening ability. 1) Formation of the intermediate (ZnC8) Carbon fibers and excess zinc powder are ball-milled at 500–700°C to generate a zinc-based compound (ZnC8) through a mechanically induced reaction. The carbon fibers act as a reaction medium, with their surface active sites binding to zinc atoms to form a stable layered compound. This not only provides a uniformly dispersed carrier for zinc but also enhances the bonding force between zinc and copper through interfacial metallurgical bonding.

[0033] ZnC8, as a nanoscale reinforcing phase, is uniformly distributed in the copper matrix, forming a "dispersion strengthening" effect that hinders dislocation movement and significantly improves the tensile strength and work hardening ability of the material. Compared to the uneven strength caused by compositional segregation in traditional smelting processes (the tensile strength of copper-zinc alloys in the prior art is usually below 400 MPa), this method improves the alloy strength through the uniform dispersion of intermediates (see the tensile strength of Examples 1-2).

[0034] 2) Multiple ball milling and metallurgical integration During the secondary ball milling process of the intermediate (ZnC8 / Zn) and copper powder, the copper powder and ZnC8 undergo atomic-level diffusion through mechanical collision, forming a strong metallurgical bonding interface. This avoids the weak bonding problem caused by the separation of copper and zinc phases in traditional processes and further strengthens the matrix structure.

[0035] The copper-zinc composite alloy with added carbon fibers obtained by the preparation method of the present invention has excellent electrical conductivity: Traditional copper-zinc alloys suffer from reduced conductivity due to the low melting point of zinc, which causes it to volatilize or segregate during smelting, forming "impurity phases" in the conductive path. This invention addresses this problem through the following steps: Intermediate synthesis: Zinc exists stably in the form of ZnC8, avoiding individual melting and volatilization at high temperatures, ensuring that zinc is uniformly distributed in the copper matrix as a nanoscale compound, reducing obstruction to the conductive pathway.

[0036] Metallurgical ball milling: Secondary ball milling allows copper and ZnC8 to come into full contact, forming a continuous copper matrix network. Zinc-based compounds are embedded in it as highly conductive phases, rather than as independent low-conductivity phases, thus maintaining the high intrinsic conductivity of copper.

[0037] Experimental data show that the conductivity of the material prepared by this method can reach 70-88% IACS or higher, which is close to the level of pure copper (97-99% IACS).

[0038] The copper-zinc composite alloy with added carbon fibers obtained by the preparation method of the present invention has excellent wear resistance. The skeletal function of carbon fiber: 1000 mesh carbon fiber acts as a reinforcement, uniformly dispersed in the alloy to form a "hard point" support structure, resisting abrasive wear during the friction process.

[0039] Densification through isostatic pressing: alternating hot and cold isostatic pressing eliminates pores between powder particles, resulting in a material density of over 98% and reducing the initiation of microcracks during wear.

[0040] Surface hardness improvement: The synergistic effect of ZnC8 compound and carbon fiber increases the surface hardness (HV) of the material, significantly reducing the wear rate (see wear resistance data in Examples 1-2).

[0041] The preparation method of this invention provides a copper-zinc composite alloy with added carbon fibers, which solves the problem of zinc powder volatilization and separation. Zinc's low melting point (419.5℃) makes it easily volatile in conventional smelting (boiling point 907℃), and the density difference between zinc and copper (zinc 7.14 g / cm³, copper 8.96 g / cm³) leads to gravitational segregation. This invention fixes zinc through a chemical reaction: Under the high temperature (500~700℃) and mechanical force of ball milling, zinc reacts with carbon fiber to form ZnC8 (a thermodynamically stable metal carbide). The melting point of this compound (about 1200℃) is much higher than the boiling point of zinc, thus avoiding volatilization in subsequent processing. ZnC8 forms a homogeneous mixture (ZnC8 / Zn) with the remaining zinc powder. Through the dual effects of physical encapsulation and chemical bonding, zinc exists as a "stable intermediate" when mixed with copper, rather than as metallic zinc alone, thus fundamentally solving the phase separation problem.

[0042] The preparation method of the present invention improves production efficiency and reduces costs: Eliminating complex stirring: Traditional processes require high-temperature stirring for several hours to avoid segregation. This invention utilizes the "self-homogenization" characteristics of intermediates, requiring only two ball milling operations (total time 4-7 hours) to achieve uniform composition, reducing energy consumption and equipment occupancy time.

[0043] Advantages of low-temperature processing: The ball milling and extrusion temperatures (500~700℃, 360~530℃) are significantly lower than the traditional smelting temperatures (copper melting point 1083℃), reducing energy consumption by more than 30%; Less human intervention: The entire process is completed through automated equipment such as ball milling, isostatic pressing and extrusion, avoiding the frequent component testing and adjustment in traditional processes, and reducing production costs by about 30-40%.

[0044] This invention relates to a low-cost, short-process method for preparing a high-strength, high-conductivity copper-zinc composite alloy (CuZn / CF) with added carbon fibers. The raw materials include 500-mesh copper powder (99.9% purity), 500-mesh zinc powder (99.9% purity), and 1000-mesh carbon fibers (CF) (99.9% purity). The carbon fibers are added to an excess of zinc powder in a certain proportion to form a ZnC8 / Zn mixture. The mixture is then ball-milled thoroughly at 500-700°C for an extended period to allow the carbon fibers and zinc to fully react and form a zinc-based compound (ZnC8). This homogeneous ZnC8 / Zn mixture is used as an intermediate and subsequently ball-milled with pure copper powder at 500-700°C to achieve metallurgical bonding. The mixture is then repeatedly subjected to hot isostatic pressing and cold isostatic pressing, followed by feeding it into a continuous extruder via a powder feeding mechanism for forming, and finally heat-treated at 200-400°C. This method ensures that the zinc-carbon fiber compound does not separate during mixing, eliminating the need for additional processing and effectively improving the uniformity and strength of the alloy while reducing production costs. The advantages of this CuZn / CF composite material are: 1. High strength, with very high work-hardening strength; 2. Good electrical conductivity; 3. Excellent wear resistance as a friction material; 4. Ensures thorough mixing of the copper-zinc alloy, solving the problem of volatilization or separation caused by the low melting point of zinc powder; 5. Improved production efficiency and reduced production costs; 6. High resistance to high-temperature softening.

[0045] The present invention is further illustrated by the following examples. Tables 1-2 show the performance of the copper-zinc composite alloy rods with added carbon fibers in Examples 1-2.

[0046] Tensile strength is the maximum tensile stress a material can withstand during the tensile process, from the start to the point of fracture, and is measured in MPa (megapascals). When the tensile force on a material reaches its tensile strength, the material begins to exhibit necking and eventually fractures.

[0047] Conductivity (%IACS) is an important indicator of a material's electrical conductivity; a higher value indicates better conductivity. %IACS, or International Standard for Annealed Copper, is a unit characterizing conductivity. This standard uses the conductivity of internationally annealed copper as a reference, defining it as 100% IACS. For other metallic materials, their conductivity can be calculated by comparing them to the conductivity of internationally annealed copper and converting the result to a %IACS value. In practical applications, a high %IACS value signifies better electron transport efficiency and conductivity, which is crucial for applications requiring high-quality, high-conductivity metallic materials. Therefore, when selecting alloy materials, a higher %IACS value is generally preferred.

[0048] Elongation refers to the percentage of total elongation to the original gauge length after tensile fracture, and is used to characterize the plastic deformation capacity of a material.

[0049] The softening temperature refers to the specific temperature at which a material gradually softens from a solid state and loses its original strength, hardness, and other mechanical properties during the heating process.

[0050] Example 1 A method for preparing a copper-zinc composite alloy with added carbon fibers includes the following steps: (1) Mixing carbon fiber and zinc powder We selected 500-mesh copper powder with a purity of 99.9%, 500-mesh zinc powder with a purity of 99.9%, and 1000-mesh carbon fiber with a purity of 99.9% using wet preservation as raw materials. The carbon fiber was added to an excess of zinc powder, with a volume percentage of zinc powder to carbon fiber of 2:1.

[0051] (2) Ball milling treatment The mixture was thoroughly ball-milled at 500℃, placed in a ball milling jar, sealed with anhydrous ethanol, and then purged with low-pressure argon gas. The ball milling speed was 100 r / min, the milling time was 4 h, and the argon gas pressure was 0.1~0.9 MPa. The mixture was then dried after ball milling. Through continuous impact and collision between the zinc powder, the carbon fiber, and the container wall, the carbon fiber and zinc reacted fully to form a homogeneous zinc-based compound (ZnC8).

[0052] (3) Mix the copper powder A zinc-based mixture was used as an intermediate, with the ZnC8 / Zn mixture and Cu powder having a mass percentage ratio of 3:97.

[0053] (4) Ball milling treatment The copper powder and zinc-based compound (ZnC8) were metallurgically bonded by ball milling under argon protection at 500℃ for 0.1~1h at a ball milling speed of 100r / min and an argon pressure of 0.1~0.2MPa.

[0054] (5) Isostatic pressing Subsequently, it was repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatments with pure copper powder at 600°C. The hot isostatic pressing treatment temperature was 1000°C and the pressure was 100 MPa, while the cold isostatic pressing treatment temperature was 20°C and the pressure was 100 MPa.

[0055] (6) Extrusion molding The powder is fed into a continuous extruder for forming. The extrusion roller rotates at 10 r / min and the extrusion temperature is 400℃, forming a copper-zinc composite alloy (CuZn / CF) bar with a metallurgical bonding surface and carbon fiber, with a diameter of 25 mm.

[0056] (7) Heat treatment Finally, it undergoes a heat treatment at 300℃.

[0057] Table 1. Properties of copper-zinc composite alloy rods with added carbon fiber in Example 1

[0058] Example 2 A method for preparing a copper-zinc composite alloy with added carbon fibers includes the following steps: (1) Mixing carbon fiber and zinc powder 500-mesh copper powder with a purity of 99.9%, 500-mesh zinc powder with a purity of 99.9%, and 1000-mesh carbon fiber with a purity of 99.9% wet-process preservation were selected as raw materials. The carbon fiber was added to an excess of zinc powder, and the volume percentage of zinc powder to carbon fiber was 4:1.

[0059] (2) Ball milling treatment The mixture was thoroughly ball-milled at 500℃, placed in a milling jar, sealed with anhydrous ethanol, and then purged with low-pressure argon gas. The milling speed was 200 r / min, the milling time was 6 h, and the argon gas pressure was 0.1~0.9 MPa. The mixture was then dried after milling. Through continuous impact and collision between the zinc powder, the carbon fiber, and the container wall, the carbon fiber and zinc reacted fully to form a homogeneous zinc-based compound (ZnC8).

[0060] (3) Mix the copper powder A zinc-based mixture was used as an intermediate, with the ZnC8 / Zn mixture and Cu powder having a mass percentage ratio of 6:94.

[0061] (4) Ball milling treatment The copper powder and zinc-based compound (ZnC8) are metallurgically bonded by ball milling under argon protection at 500℃ for 0.1~1h at a ball milling speed of 200r / min and an argon pressure of 0.1~0.2MPa.

[0062] (5) Isostatic pressing Subsequently, it was repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatments with pure copper powder at 700°C. The hot isostatic pressing treatment temperature was 1000°C and the pressure was 100 MPa, while the cold isostatic pressing treatment temperature was 20°C and the pressure was 100 MPa.

[0063] (6) Extrusion molding The powder is fed into a continuous extruder for forming. The extrusion roller rotates at 10 r / min and the extrusion temperature is 400℃, forming a copper-zinc composite alloy (CuZn / CF) bar with a metallurgical bonding surface and carbon fiber, with a diameter of 25 mm.

[0064] (7) Heat treatment Finally, it undergoes a heat treatment at 300℃.

[0065] Table 2. Properties of copper-zinc composite alloy rods with added carbon fiber in Example 2

[0066] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. Although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0067] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preparing a copper-zinc composite alloy with added carbon fibers, characterized in that, Includes the following steps: S101. Mix carbon fiber with zinc source, and then ball mill at high temperature to allow carbon fiber and zinc to fully react and form zinc-based compound; S102. A zinc-based mixture containing a zinc-based compound and a zinc source is used as an intermediate. A copper source is added, and then the mixture is ball-milled at high temperature to allow the zinc-based compound and copper to undergo metallurgical bonding to form a copper-zinc mixture. S103. The copper-zinc mixture is repeatedly subjected to hot isostatic pressing and cold isostatic pressing treatments before being extruded and molded. S104, after subsequent heat treatment, a copper-zinc composite alloy with added carbon fiber is obtained.

2. The preparation method according to claim 1, characterized in that, The zinc source is 500-mesh zinc powder with a purity of 99.9%; the copper source is 500-mesh copper powder with a purity of 99.9%; and the carbon fiber is 1000-mesh carbon fiber with a purity of 99.9%.

3. The preparation method according to claim 2, characterized in that, The volume percentage of carbon fiber to zinc powder is (1:1) to (4:1).

4. The preparation method according to claim 1, characterized in that, In step S101, the ball milling process is as follows: carbon fiber and zinc source are placed in a ball milling container at 500~700℃, anhydrous ethanol is added, the container is sealed, and low-pressure inert gas is introduced for ball milling. The ball milling speed is 80~500 r / min, the ball milling time is 3~6 h, and the pressure of the inert gas is 0.1~0.9 MPa.

5. The preparation method according to claim 1, characterized in that, In step S101, the mixture is ball-milled and then dried to obtain a zinc-based compound, which is ZnC8.

6. The preparation method according to claim 2, characterized in that, In step S102, the mass percentage of zinc-based mixture to copper powder is (3:97) to (6:94).

7. The preparation method according to claim 1, characterized in that, In step S102, the ball milling process is as follows: at 500~700℃, the zinc-based mixture and the copper source are placed in a ball milling container, anhydrous ethanol is added, the container is sealed, and a low-pressure inert gas is introduced for ball milling. The ball milling speed is 80~500 r / min, the ball milling time is 0.1~1 h, and the pressure of the inert gas is 0.1~0.2 MPa.

8. The preparation method according to claim 1, characterized in that, In step S103, the copper-zinc mixture is then repeatedly subjected to hot isostatic pressing and cold isostatic pressing at 500~700°C; the hot isostatic pressing temperature is 1000~2000°C and the pressure is 100~200 MPa; the cold isostatic pressing temperature is 20~40°C and the pressure is 100~200 MPa.

9. The preparation method according to claim 1, characterized in that, In step S103, the extrusion molding process includes: the copper-zinc mixture is fed into a continuous extruder through a powder feeding mechanism, the extrusion roller speed is 5~15 r / min, the extrusion temperature is 360~530℃, and a copper-zinc composite alloy rod with added carbon fiber and metallurgical bonding surface is formed with a diameter of 20~40mm.

10. The preparation method according to claim 1, characterized in that, In step S104, the temperature of the subsequent heat treatment is 200~400℃.

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