Preparation method of carbon fiber reinforced carbon modified tungsten copper alloy

Abstract

The invention discloses a preparation method of a carbon fiber reinforced carbon modified tungsten copper alloy, and belongs to the technical field of metal matrix composite material preparation. According to the method, carbon fibers are subjected to surface treatment and mixed with tungsten powder, copper powder and a carbon source material, and the carbon fiber reinforced carbon modified tungsten-copper alloy with excellent mechanical properties and electric and heat conduction properties is prepared through the process steps of forming, sintering and the like. The prepared alloy is excellent in comprehensive performance, simple and controllable in preparation process, suitable for industrial production and capable of being widely applied to the fields of electronics, aerospace and the like.

Description

Technical Field

[0001] This invention relates to the field of metal matrix composite material preparation technology, and in particular to a method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy. Background Technology

[0002] Tungsten-copper alloys are pseudo-alloys composed of tungsten and copper, combining the high melting point, high strength, and high hardness of tungsten with the good electrical and thermal conductivity of copper. They are widely used in electronic packaging, contact materials, and heat dissipation components. However, traditional tungsten-copper alloys still have certain shortcomings in terms of mechanical properties, such as relatively low strength and toughness, making it difficult to meet the requirements of some high-end applications.

[0003] To improve the performance of tungsten-copper alloys, researchers have employed various modification methods. Among these, adding reinforcing phases is an effective approach. Carbon fibers possess excellent properties such as high strength, high modulus, and low density, and adding them as reinforcing phases to tungsten-copper alloys is expected to significantly improve the alloy's mechanical properties. However, carbon fibers have poor wettability with tungsten and copper, resulting in low interfacial bonding strength. Direct addition can easily lead to uneven dispersion of carbon fibers in the alloy, which may actually reduce the alloy's performance. Furthermore, the state and distribution of carbon elements in tungsten-copper alloys also have a significant impact on the alloy's performance. How to rationally introduce carbon and control its morphology and distribution is key to improving the performance of tungsten-copper alloys.

[0004] Therefore, developing a preparation method that can improve the interfacial bonding between carbon fibers and the matrix, rationally introduce carbon elements, and thus improve the overall performance of tungsten-copper alloys is of great practical significance. Summary of the Invention

[0005] This invention relates to a method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy, which solves the problem that traditional tungsten-copper alloys still have certain shortcomings in terms of mechanical properties, such as low strength and toughness, making it difficult to meet the requirements of some high-end fields.

[0006] A method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy includes the following steps: (1) Carbon fiber surface treatment: The carbon fiber is subjected to degumming treatment, roughening treatment and coating treatment in sequence; (2) Raw material preparation: Prepare 50-80 parts of tungsten powder, 10-30 parts of copper powder, 5-15 parts of surface-treated carbon fiber, and 1-5 parts of carbon source material by weight. (3) Mixing: The raw materials prepared in step (2) are put into a ball mill for mixing to obtain mixed powder; (4) Molding: The mixed powder is placed in a mold and pressed under a pressure of 50-200MPa to obtain a blank; (5) Sintering: The billet is placed in a sintering furnace and heated to 800-1000℃ at a heating rate of 5-10℃ / min under a protective atmosphere. It is held for 1-2 hours and then heated to 1200-1500℃ at a heating rate of 3-5℃ / min. It is held for 2-4 hours and then cooled with the furnace to obtain carbon fiber reinforced carbon modified tungsten copper alloy.

[0007] Further, in step (1), the degumming treatment involves treating the carbon fiber in an air atmosphere at 400-500℃ for 1-2 hours. The surface of carbon fiber usually contains a certain amount of resin adhesive, which can affect the bonding between the carbon fiber and the matrix. The degumming treatment can remove these adhesives and improve the surface activity of the carbon fiber.

[0008] Further, in step (1), the roughening treatment involves immersing the degummed carbon fibers in a 10-20% nitric acid solution at 60-80°C for 2-4 hours, then rinsing them with deionized water until neutral and drying them. The nitric acid solution can corrode the surface of the carbon fibers, forming a rough surface, increasing the specific surface area of ​​the carbon fibers, which is beneficial for subsequent coating treatment and bonding with the substrate.

[0009] Further, in step (1), the coating treatment involves immersing the roughened carbon fibers in an ethanol solution containing a silane coupling agent, wherein the mass fraction of the silane coupling agent is 1-3%, at 30-50°C for 1-2 hours, and then removing and drying them. The silane coupling agent can form an organic coating on the surface of the carbon fibers, improving the wettability and interfacial bonding strength between the carbon fibers and the tungsten and copper matrices, thereby improving the performance of the composite material.

[0010] Further, in step (2), the average particle size of the tungsten powder is 1-5 μm, the average particle size of the copper powder is 1-3 μm, and the length of the carbon fiber is 50-200 μm and the diameter is 5-10 μm. Selecting tungsten powder and copper powder with suitable particle sizes is beneficial to improving the sintering activity of the powder, while carbon fibers with suitable length and diameter can be uniformly dispersed in the alloy and play their reinforcing role. Further, in step (2), the carbon source material is one or more of graphite powder, carbon black, or carbon nanotubes, with an average particle size of 50-200 nm. Introducing carbon source material can carbon modify the tungsten-copper alloy. Carbon can fill the pores in the tungsten-copper alloy, improve the density of the alloy, and can also form a solid solution or compound with tungsten to improve the strength and hardness of the alloy. Further, in step (3), the ball-to-material ratio of the ball mill is 5-10:1, the rotation speed is 200-300 r / min, the mixing time is 2-4 h, and the ball milling medium is anhydrous ethanol. Ball milling can make raw materials mix evenly. The selection of parameters such as ball-to-material ratio, rotation speed and mixing time will affect the mixing effect. Anhydrous ethanol as a ball milling medium can prevent powder oxidation and is also beneficial to powder dispersion.

[0011] Further, in step (5), the protective atmosphere is argon or nitrogen, with a gas flow rate of 1-5 L / min. Introducing a protective atmosphere during sintering prevents oxidation of the billet and ensures smooth sintering. Staged heating and holding allow for the full expulsion of gas from the billet, promoting powder diffusion and sintering, and improving the density and properties of the alloy.

[0012] This invention provides a geographic information laser scanning survey device, which has the following beneficial effects: This invention involves surface treatment of carbon fibers. Through degumming, roughening, and coating, the wettability and interfacial bonding strength between carbon fibers and tungsten and copper matrices are effectively improved, enabling the carbon fibers to be uniformly dispersed in the alloy, fully exerting their reinforcing effect, and improving the strength and toughness of the alloy.

[0013] This invention introduces carbon source materials for carbon modification. Carbon can fill the pores in tungsten-copper alloys, increase the density of the alloys, and form solid solutions or compounds with tungsten, further improving the mechanical properties of the alloys.

[0014] This invention, through reasonable control of raw material ratio, ball milling parameters and sintering process, prepares carbon fiber reinforced carbon modified tungsten copper alloy that not only has excellent mechanical properties, but also maintains good electrical and thermal conductivity, resulting in excellent overall performance.

[0015] The preparation process of this invention is simple and controllable, suitable for industrial production, and the prepared alloy can be widely used in electronics, aerospace and other fields, and has high practical value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram: Figure 1 The diagram shows the performance test results of the carbon fiber reinforced carbon-modified tungsten-copper alloy of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1 A method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy includes the following steps: (1) Carbon fiber surface treatment: Carbon fiber surface treatment is a key step to ensure good bonding between carbon fiber and matrix material, mainly including three steps: degumming, roughening and coating treatment.

[0021] De-adhesive treatment: The carbon fiber is treated in air at 400℃ for 2 hours. The purpose of this process is to remove impurities such as adhesives remaining on the surface of the carbon fiber during preparation and storage. These impurities can affect the bonding performance of carbon fiber with other materials. High-temperature air treatment allows the impurities to oxidize, decompose, and volatilize, laying a good foundation for subsequent processing. The temperature of 400℃ was determined after multiple experiments. At this temperature, impurities can be effectively removed without damaging the structure and properties of the carbon fiber itself. The treatment time is 2 hours to ensure that the impurities are fully decomposed and removed.

[0022] Roughening treatment: The degummed carbon fibers are immersed in a 10% nitric acid solution at 60°C for 4 hours. Nitric acid solution has strong oxidizing properties, which can etch the carbon fiber surface, increasing its surface roughness. Increased surface roughness helps to increase the contact area between the carbon fiber and the matrix material, thereby improving the interfacial bonding strength. A 10% nitric acid solution concentration and a temperature of 60°C are suitable parameters, achieving the desired roughening effect while avoiding excessive corrosion of the carbon fiber. Immersion for 4 hours ensures sufficient roughening treatment of the carbon fiber surface. After treatment, the carbon fiber is removed and rinsed with deionized water until neutral to remove residual nitric acid solution and prevent it from affecting subsequent processing, and then dried.

[0023] Coating Treatment: The dried carbon fibers are immersed in an ethanol solution containing a 1% (w / w) silane coupling agent at 30°C for 2 hours, then removed and dried. The silane coupling agent molecule has groups at both ends capable of bonding with inorganic and organic materials, respectively. By forming a coating on the carbon fiber surface, the interfacial compatibility between the carbon fiber and the matrix material can be effectively improved. A 1% (w / w) silane coupling agent concentration can form a uniform and effective coating. The 30°C temperature and 2-hour immersion time are conducive to the full adsorption and reaction of the silane coupling agent on the carbon fiber surface, thereby improving the adhesion and stability of the coating. After drying, the surface treatment of the carbon fibers is complete.

[0024] (2) Raw material preparation: By weight, prepare 50 parts of tungsten powder with an average particle size of 1 μm, 30 parts of copper powder with an average particle size of 1 μm, 15 parts of carbon fiber with a length of 50 μm and a diameter of 5 μm after surface treatment, and 1 part of graphite powder with an average particle size of 50 nm.

[0025] Tungsten powder and copper powder are the main raw materials constituting the matrix of tungsten-copper alloys, and their particle size has a significant impact on the alloy's properties. Tungsten powder and copper powder with an average particle size of 1 μm are relatively fine, which can ensure uniform distribution during subsequent mixing, resulting in a more uniform alloy structure and more stable properties.

[0026] The length and diameter of the carbon fibers were also carefully selected. Carbon fibers with a length of 50 μm and a diameter of 5 μm can form an effective reinforcing skeleton in the alloy, fully exerting their reinforcing effect. At the same time, surface-treated carbon fibers have better compatibility with the matrix material, which can further improve the performance of the composite material.

[0027] The addition of graphite powder is mainly for carbon modification. Graphite powder with an average particle size of 50nm has a large specific surface area and high activity, and can be uniformly dispersed in the matrix to improve the wear resistance, lubricity, and other properties of the alloy. The weight percentage of 1 part is determined by comprehensively considering the modification effect and material cost.

[0028] (3) Mixing: Put the prepared raw materials into a ball mill with a ball-to-material ratio of 5:1 and a rotation speed of 200 r / min. Use anhydrous ethanol as the ball milling medium and mix for 4 hours to obtain a mixed powder.

[0029] Ball milling is a key process for uniformly mixing raw materials. A ball-to-material ratio of 5:1 (i.e., the mass ratio of grinding balls to raw materials in the ball mill is 5:1) ensures sufficient grinding force for thorough mixing and refinement of the materials. A rotation speed of 200 r / min guarantees effective mixing while avoiding excessive grinding or heat generation that could negatively impact performance.

[0030] Anhydrous ethanol, used as the ball milling medium, exhibits excellent dispersibility, preventing raw material particle agglomeration. Furthermore, it readily volatilizes during subsequent drying, leaving no impurities in the mixed powder. The mixing time is 4 hours to ensure that all raw materials are thoroughly and uniformly mixed, forming a homogeneous powder.

[0031] (4) Molding: The mixed powder is placed in a mold and pressed under a pressure of 50 MPa to obtain a blank.

[0032] The forming process involves shaping the mixed powder into a green body with a specific shape and size. The pressing pressure of 50 MPa is determined based on the characteristics of the raw materials and the required density of the green body. Appropriate pressure ensures that the mixed powder particles are tightly bound together, increasing the density of the green body and reducing shrinkage and deformation during subsequent sintering. During pressing, it is crucial to ensure uniform pressure distribution to guarantee consistent density across all parts of the green body.

[0033] (5) Sintering: The billet is placed in a sintering furnace and argon gas with a flow rate of 1L / min is introduced as a protective atmosphere. The temperature is first raised to 800℃ at a heating rate of 5℃ / min and held for 2h. Then the temperature is raised to 1200℃ at a heating rate of 3℃ / min and held for 4h. The billet is then cooled with the furnace to obtain carbon fiber reinforced carbon modified tungsten copper alloy.

[0034] Sintering is a key step that determines the final alloy properties. By heating at high temperatures, particles in the billet diffuse and fuse, thereby improving the density and mechanical properties of the material.

[0035] Argon is introduced as a protective atmosphere to prevent the billet from being oxidized at high temperatures. Argon is an inert gas that can isolate air and prevent materials such as tungsten, copper, and carbon fiber from reacting with oxygen, ensuring the smooth progress of the sintering process. A flow rate of 1L / min can effectively maintain the inert atmosphere inside the furnace.

[0036] The heating process is divided into two stages. First, the temperature is increased to 800℃ at a rate of 5℃ / min and held for 2 hours. The purpose of this stage is to gradually remove residual moisture and organic impurities from the green body, while simultaneously allowing the raw material particles to initially bond together. The slower heating rate avoids internal stress and cracking in the green body caused by rapid temperature changes. Holding for 2 hours ensures uniform temperature throughout the green body, guaranteeing thorough removal of impurities and effective initial bonding.

[0037] Then, the temperature is increased to 1200℃ at a heating rate of 3℃ / min and held for 4 hours. 1200℃ is the critical sintering temperature. At this temperature, materials such as tungsten and copper can fully diffuse and fuse, and a good bond can be formed between the carbon fibers and the matrix. The slower heating rate can reduce the stress and deformation of the green body at high temperatures. Holding for 4 hours ensures that the sintering process is fully completed, improving the density and mechanical properties of the material.

[0038] Finally, the material is cooled in the furnace to avoid internal stress and cracking caused by rapid cooling, thus ensuring the stable performance of the final product.

[0039] Example 2: Please refer to Figure 1 A method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy includes the following steps: (1) Carbon fiber surface treatment: Degumming treatment: The carbon fiber was treated in an air atmosphere at 450°C for 1.5 hours. Compared with Example 1, the degumming temperature was increased to 450°C and the treatment time was shortened to 1.5 hours. The higher temperature can accelerate the oxidative decomposition of impurities, so a good degumming effect can still be achieved by appropriately shortening the treatment time. This parameter adjustment can improve the processing efficiency while ensuring the degumming effect.

[0040] Roughening treatment: The carbon fibers were immersed in a 15% (w / w) nitric acid solution at 70°C for 3 hours. The 15% nitric acid concentration and 70°C temperature, higher than in Example 1, enhanced the etching effect on the carbon fiber surface, further increasing surface roughness and potentially strengthening the bond strength between the carbon fibers and the matrix. The immersion time was shortened to 3 hours because the higher concentration and temperature accelerated the roughening reaction. After treatment, the fibers were rinsed with deionized water until neutral and then dried.

[0041] Coating treatment: The dried carbon fibers were immersed in an ethanol solution containing a 2% (w / w) silane coupling agent at 40°C for 1.5 hours. The 2% silane coupling agent concentration is higher than in Example 1, enabling the formation of a thicker coating on the carbon fiber surface and potentially further improving interfacial compatibility. The 40°C temperature and 1.5-hour immersion time accommodate the reaction requirements of the higher concentration of coupling agent, ensuring effective coating treatment.

[0042] (2) Raw material preparation: By weight, prepare 65 parts of tungsten powder with an average particle size of 3μm, 20 parts of copper powder with an average particle size of 2μm, 10 parts of carbon fiber with a length of 120μm and a diameter of 8μm after surface treatment, and 3 parts of carbon black with an average particle size of 120nm.

[0043] The average particle size of tungsten powder increased to 3 μm, and the weight percentage increased to 65 parts. This may affect the strength and hardness of the alloy, and the coarser tungsten powder particles may alter the alloy's wear resistance. The average particle size of copper powder was 2 μm, and the weight percentage decreased to 20 parts. The reduction in copper content may slightly decrease the alloy's electrical and thermal conductivity, but the increase in tungsten content may improve its high-temperature resistance.

[0044] The length of the carbon fiber was increased to 120 μm, the diameter to 8 μm, and the weight percentage decreased to 10 parts. The longer and thicker carbon fibers may produce a different reinforcing effect compared to Example 1; the specific performance needs to be determined based on the actual application scenario. The carbon black had an average particle size of 120 nm and a weight percentage of 3 parts. As a carbon-modifying material, increasing the amount of carbon black may further improve certain properties of the alloy, such as wear resistance and electrical conductivity.

[0045] (3) Mixing: Put the above raw materials into a ball mill with a ball-to-material ratio of 8:1 and a rotation speed of 250 r / min. Use anhydrous ethanol as the ball milling medium and mix for 3 hours to obtain mixed powder.

[0046] Increasing the ball-to-powder ratio to 8:1 and the rotation speed to 250 rpm means greater grinding force and potentially better mixing, allowing coarser tungsten powder and longer carbon fibers to be more evenly dispersed in the mixed powder. The mixing time is shortened to 3 hours because the increased ball-to-powder ratio and rotation speed accelerate the mixing process, achieving uniform mixing in a shorter time.

[0047] (4) Molding: The mixed powder is placed in a mold and pressed under a pressure of 120 MPa to obtain a blank. The pressing pressure of 120 MPa is much higher than that in Example 1. The higher pressure can make the mixed powder particles bond more tightly, improve the density of the blank, and lay the foundation for subsequent sintering to prepare high-performance alloys.

[0048] (5) Sintering: The billet is placed in a sintering furnace and nitrogen gas with a flow rate of 3L / min is introduced as a protective atmosphere. The temperature is first raised to 900℃ at a heating rate of 8℃ / min and held for 1.5h. Then the temperature is raised to 1350℃ at a heating rate of 4℃ / min and held for 3h. The billet is then cooled with the furnace to obtain carbon fiber reinforced carbon modified tungsten copper alloy.

[0049] Nitrogen is used as the protective atmosphere. Nitrogen is also an inert gas and can play a good role in preventing oxidation. The flow rate of 3L / min ensures a sufficient protective atmosphere in the furnace.

[0050] Both the heating rate and the final sintering temperature were increased. The temperature was first increased to 900℃ at 8℃ / min and held for 1.5 hours, then increased to 1350℃ at 4℃ / min and held for 3 hours. The higher temperature and faster heating rate may promote material diffusion and fusion, improving the alloy's density and properties. However, it is necessary to carefully control the parameters to avoid over-sintering or other adverse phenomena. The holding time was shortened accordingly because the higher temperature accelerated the sintering reaction.

[0051] Example 3: Please refer to Figure 1 A method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy includes the following steps: (1) Carbon fiber surface treatment: Degumming treatment: The carbon fiber is treated in an air atmosphere at 500℃ for 1 hour. The high temperature of 500℃ further accelerates the removal of impurities, shortening the treatment time to 1 hour, which greatly improves the treatment efficiency while ensuring the degumming effect. However, it should be noted that excessively high temperatures may have a certain impact on the performance of carbon fiber. Therefore, this temperature parameter is determined on the premise of ensuring that the performance of carbon fiber is not significantly damaged.

[0052] Roughening treatment: The carbon fibers were immersed in a 20% nitric acid solution at 80°C for 2 hours. The 20% nitric acid concentration and 80°C were the highest among the three examples, resulting in the strongest etching effect on the carbon fiber surface, creating greater surface roughness, which is beneficial for improving the bonding strength between the carbon fibers and the matrix. The immersion time was shortened to 2 hours to accommodate the reaction rate under strong etching conditions. After treatment, the fibers were rinsed with deionized water until neutral and then dried.

[0053] Coating treatment: The dried carbon fibers are immersed in an ethanol solution containing a 3% silane coupling agent by mass at 50°C for 1 hour. The 3% silane coupling agent concentration and the 50°C temperature are the highest, which can form an effective coating in a short time (1 hour), further enhancing the interfacial compatibility between the carbon fibers and the matrix.

[0054] (2) Raw material preparation: By weight, prepare 80 parts of tungsten powder with an average particle size of 5 μm, 10 parts of copper powder with an average particle size of 3 μm, 5 parts of carbon fiber with a length of 200 μm and a diameter of 10 μm after surface treatment, and 5 parts of carbon nanotubes with an average particle size of 200 nm.

[0055] Increasing the average particle size of tungsten powder to 5 μm and its weight percentage to 80 parts significantly increases the tungsten content in the alloy, potentially enhancing its high-temperature resistance and wear resistance, but possibly reducing its electrical and thermal conductivity. Conversely, reducing the copper powder's average particle size to 3 μm and its weight percentage to 10 parts further decreases the copper content, significantly impacting the alloy's electrical and thermal conductivity, but reducing its cost.

[0056] The carbon fiber length was increased to 200 μm, the diameter to 10 μm, and the weight fraction reduced to 5 parts. The distribution and reinforcing effect of the longer and thicker carbon fibers in the alloy differed from the previous two embodiments, potentially making them more suitable for certain specific applications. Carbon nanotubes possess excellent mechanical and electrical properties; adding 5 parts of carbon nanotubes with an average particle size of 200 nm, as a carbon modification material, can synergistically work with carbon fibers to further improve the alloy's performance.

[0057] (3) Mixing: Put the above raw materials into a ball mill with a ball-to-material ratio of 10:1 and a rotation speed of 300 r / min. Use anhydrous ethanol as the ball milling medium and mix for 2 hours to obtain mixed powder.

[0058] The ball-to-powder ratio was increased to 10:1, and the rotation speed was increased to 300 r / min, the highest among the three embodiments. This provides stronger grinding force, ensuring that coarser tungsten powder, longer carbon fibers, and carbon nanotubes are thoroughly and uniformly mixed. The mixing time was shortened to 2 hours. Due to the significant increase in the ball-to-powder ratio and rotation speed, the mixing efficiency was significantly improved, achieving good mixing results in a short time.

[0059] (4) Molding: The mixed powder is placed in a mold and pressed under a pressure of 200 MPa to obtain a green body. The pressing pressure of 200 MPa is the highest among the three embodiments, which can make the mixed powder particles bond extremely tightly and prepare a green body with high density, providing favorable conditions for subsequent sintering to prepare high-performance alloys. However, the high pressure also places higher requirements on the mold, requiring the use of mold equipment that can withstand high pressure.

[0060] (5) Sintering: The billet is placed in a sintering furnace and argon gas with a flow rate of 5L / min is introduced as a protective atmosphere. The temperature is first raised to 1000℃ at a heating rate of 10℃ / min and held for 1h. Then the temperature is raised to 1500℃ at a heating rate of 5℃ / min and held for 2h. The billet is then cooled with the furnace to obtain carbon fiber reinforced carbon modified tungsten copper alloy.

[0061] An argon flow rate of 5 L / min effectively isolates the material from air, preventing oxidation. The heating rate and final sintering temperature are the highest in the three embodiments: first, the temperature is increased to 1000℃ at 10℃ / min and held for 1 hour, then increased to 1500℃ at 5℃ / min and held for 2 hours. The higher temperature and faster heating rate promote rapid diffusion and fusion of the material, but strict control is required to avoid overheating and deformation. The further shortened holding time is suitable for rapid sintering at high temperatures.

[0062] In summary, the three embodiments, by adjusting carbon fiber surface treatment parameters, raw material ratios, mixing processes, molding pressures, and sintering processes, prepared carbon fiber-reinforced carbon-modified tungsten-copper alloys with different properties. The appropriate preparation method can be selected based on specific application requirements. In actual production, further optimization of process parameters is needed, taking into account factors such as production equipment and cost, to obtain the best economic benefits and product performance.

Claims

1. A method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy, characterized in that, Includes the following steps: (1) Carbon fiber surface treatment: The carbon fiber is subjected to degumming treatment, roughening treatment and coating treatment in sequence; (2) Raw material preparation: Prepare 50-80 parts of tungsten powder, 10-30 parts of copper powder, 5-15 parts of surface-treated carbon fiber, and 1-5 parts of carbon source material by weight. (3) Mixing: The raw materials prepared in step (2) are put into a ball mill for mixing to obtain mixed powder; (4) Molding: The mixed powder is placed in a mold and pressed under a pressure of 50-200MPa to obtain a blank; (5) Sintering: The billet is placed in a sintering furnace and heated to 800-1000℃ at a heating rate of 5-10℃ / min under a protective atmosphere. It is held for 1-2 hours and then heated to 1200-1500℃ at a heating rate of 3-5℃ / min. It is held for 2-4 hours and then cooled with the furnace to obtain carbon fiber reinforced carbon modified tungsten copper alloy.

2. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (1), the degumming process involves treating the carbon fiber in an air atmosphere at 400-500℃ for 1-2 hours.

3. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (1), the roughening treatment involves immersing the degummed carbon fiber in a nitric acid solution with a mass fraction of 10-20% at 60-80°C for 2-4 hours, then rinsing it with deionized water until neutral, and drying it.

4. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (1), the coating treatment involves immersing the roughened carbon fiber in an ethanol solution containing a silane coupling agent, wherein the mass fraction of the silane coupling agent is 1-3%, at 30-50°C for 1-2 hours, and then removing and drying it.

5. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (2), the average particle size of the tungsten powder is 1-5 μm, the average particle size of the copper powder is 1-3 μm, and the length of the carbon fiber is 50-200 μm and the diameter is 5-10 μm.

6. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (2), the carbon source material is one or more of graphite powder, carbon black or carbon nanotubes, with an average particle size of 50-200 nm.

7. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (3), the ball-to-material ratio of the ball mill is 5-10:1, the rotation speed is 200-300 r / min, the mixing time is 2-4 h, and the ball milling medium is anhydrous ethanol.

8. The method for preparing carbon fiber reinforced carbon-modified tungsten-copper alloy according to claim 1, characterized in that, In step (5), the protective atmosphere is argon or nitrogen, and the gas flow rate is 1-5 L / min.

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