Three-dimensional woven w-fiber reinforced copper matrix composite and method for manufacturing the same

Abstract

This invention discloses a three-dimensional braided W fiber reinforced copper matrix composite material and its preparation method, belonging to the technical field of copper matrix composite materials. The preparation method disclosed in this invention includes the following steps: S1: A continuous set of W fibers and a continuous set of Cu alloy fibers are three-dimensionally braided to obtain a fiber-braided preform; S2: After cleaning the fiber-braided skeleton, it is mixed with copper alloy powder and then subjected to hot isostatic pressing (HIP) sintering treatment in an inert gas atmosphere; the sintering temperature of the HIP sintering treatment is 900~950℃. This method obtains a mixed fiber preform of W and Cu fibers through a three-dimensional braiding process, ensuring the overall continuity of the reinforcement. Sintering at a temperature below the melting point of copper (900~950℃) helps the composite material maintain high electrical and thermal conductivity while possessing higher strength.

Description

Technical Field

[0001] This invention belongs to the field of copper-based composite material technology, specifically relating to a three-dimensional braided W-fiber reinforced copper-based composite material and its preparation method. Background Technology

[0002] Copper-based composite materials, due to their high electrical and thermal conductivity, have wide applications in numerous fields such as electronics, aerospace, and defense. However, with continuous advancements in industry, higher demands are being placed on the strength and high-temperature performance of copper-based composite materials.

[0003] Tungsten (W) possesses high melting point, high hardness, high strength, and good wear resistance. Its chemical properties are stable, and the significant difference in melting points between tungsten and copper, coupled with their immiscibility, makes it suitable as a reinforcing phase to prepare copper-based composites with good electrical conductivity, high strength, and a low coefficient of thermal expansion. Research also indicates that fibers have high specific strength and specific modulus, playing a major load-bearing role along the fiber direction. They effectively transmit and bear external forces, consuming energy during fiber pull-out and debonding, thus prolonging crack propagation paths. As a reinforcing phase, they can effectively improve the performance of composite materials. Using W fiber-reinforced copper-based composites, the directional arrangement of W fibers allows for different fiber distributions in different directions, resulting in excellent tensile strength and hardness, while also improving the material's resistance to softening. Existing W fiber-reinforced copper-based composites are mainly prepared via melt infiltration. However, melt infiltration at temperatures above the melting point of copper can cause W fibers to recrystallize, leading to a decrease in the composite's performance. Therefore, it is necessary to find a new method to prepare W fiber reinforced copper matrix composites with high density, good interfacial bonding and avoid recrystallization, so that the composites can have high strength while maintaining good conductivity, in order to meet new performance requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional braided W-fiber reinforced copper matrix composite material and its preparation method, so as to solve the technical problems that existing methods are difficult to achieve at the same time, including high density, good interfacial bonding and avoidance of recrystallization.

[0005] To achieve the above objectives, the present invention employs the following technical solution: This invention discloses a method for preparing a three-dimensional braided W-fiber reinforced copper-based composite material, comprising the following steps: S1: A continuous set of W fibers and a continuous set of Cu alloy fibers are woven in three dimensions to obtain a fiber-woven preform; S2: After cleaning the fiber braid skeleton, it is mixed with copper alloy powder and then subjected to hot isostatic pressing sintering in an inert gas atmosphere. The sintering temperature of the hot isostatic pressing sintering treatment is 900~950℃.

[0006] Furthermore, the specific steps of the three-dimensional weaving are as follows: A three-dimensional five-dimensional structure is adopted, in which a continuous set of W fibers and a continuous set of Cu alloy fibers are mixed and woven. During the mixed weaving process, Cu alloy fibers are used as axial yarns and W fibers are used as weaving yarns. The weaving yarns interweave in three-dimensional space to create a prefabricated body with a circular cross section. The group consists of a single continuous fiber or multiple continuous fibers of the same length.

[0007] Furthermore, the diameter of the W fiber is 50~200μm; the diameter of the Cu alloy fiber is 50~200μm.

[0008] Furthermore, the alloy type of the Cu alloy fiber is Cu fiber or CuCrZr fiber.

[0009] Furthermore, the integral number of W fibers in the fiber-woven preform is 10 vol% to 45 vol.

[0010] Furthermore, the cleaning is performed twice in sequence; the volume ratio of the cleaning solution used in the first cleaning is NH3•H2O:H2O2:H2O=1:4:5; the cleaning solution used in the second cleaning is anhydrous ethanol.

[0011] Furthermore, the specific steps for mixing the fiber-woven skeleton with copper alloy powder after cleaning are as follows: The fiber-woven preform is placed into a sleeve, then filled with copper alloy powder, and then vacuumed. The volume of the sheath is 10% larger than the volume of the fiber-woven preform; Evacuate to a vacuum level ≤1×10 -3 Pa.

[0012] Furthermore, the copper alloy powder is spherical copper powder or copper-chromium-zirconium powder with a particle size of 50~100μm.

[0013] Furthermore, the process parameters for the hot isostatic pressing sintering treatment are as follows: The temperature is increased to 900-950℃ at a rate of 5-15℃ / min, while the pressure inside the furnace is increased to 120-200 MPa, and then held at the set temperature and pressure for 0.5-2 h.

[0014] The present invention also discloses a three-dimensional braided W-fiber reinforced copper matrix composite material prepared by the above preparation method.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a method for preparing a three-dimensional braided W fiber reinforced copper matrix composite material. High-strength continuous W fibers, which are immiscible with copper, are used as the reinforcement. A mixed fiber preform of W and Cu fibers is obtained through a three-dimensional braiding process, ensuring the overall continuity of the reinforcement. The preform is further sintered by hot isostatic pressing to obtain the W fiber reinforced copper matrix composite material. Sintering can be performed at a temperature below the melting point of copper (900~950℃), avoiding recrystallization of the W fibers. Simultaneously, maintaining the same high pressure in all directions results in extremely high density and good interfacial bonding, which helps the composite material maintain high electrical and thermal conductivity while possessing higher strength. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fiber-woven preform structure obtained by the present invention; Figure 2 Stress-strain curves of three-dimensional woven W-fiber reinforced copper matrix composites. Detailed Implementation

[0017] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0018] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0019] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0020] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0021] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0022] This invention provides a method for preparing a three-dimensional braided W fiber reinforced copper-based composite material, which uses high-strength continuous W fibers that are completely immiscible with Cu, which can not only greatly improve the strength of Cu, but also ensure the overall conductivity.

[0023] The specific steps of this method are as follows: Step 1: Weaving: Continuous W fibers and Cu alloy fibers are woven in three dimensions to obtain a fiber braid skeleton; Step 2: Cleaning: The fiber-woven preform obtained in Step 1 is ultrasonically cleaned twice to remove impurities from the fiber surface; Step 3: Hot Isostatic Pressing: The fiber braid obtained in Step 2 is loaded into a sleeve and filled with copper alloy powder. After vacuuming, it is placed into the high-pressure cylinder of a hot isostatic press. After the furnace is closed, inert gas is introduced into the cylinder. At the same time, heating and applying uniform pressing pressure in all directions are carried out. After reaching the set temperature, the temperature and pressure are maintained for a certain period of time. Then, it is cooled to room temperature, depressurized and removed to obtain W fiber reinforced copper matrix composite material.

[0024] Preferably, the diameter of the W fiber is 50~200μm, and the diameter of the Cu alloy fiber is 50~200μm, wherein the Cu alloy fiber is Cu fiber or CuCrZr fiber with a purity ≥99.8%.

[0025] Preferably, in step 1, the fiber weaving process adopts a three-dimensional five-dimensional structure, where W fiber and Cu alloy fiber are mixed and woven. During the weaving process, Cu alloy fiber is used as the shaft yarn and W fiber is used as the weaving yarn. The weaving yarn interweaves in three-dimensional space and the shaft yarn is tightened on the surface of the mandrel to weave a preform with a circular cross section.

[0026] Preferably, in step 1, the volume fraction of W fibers in the fiber-woven preform is 10 vol% to 45 vol%.

[0027] Preferably, in step 2, the solution ratio used for the first cleaning is NH3•H2O:H2O2:H2O=1:4:5, and the second cleaning is anhydrous ethanol.

[0028] Preferably, in step 3, the size of the sheath is 10% larger than the size of the braided body, and the interior of the sheath is filled with copper alloy powder, which is spherical copper powder or copper-chromium-zirconium powder with a particle size of 50~100μm. Then, a vacuum is drawn to a vacuum degree ≤1×10 -3 Pa.

[0029] Preferably, in step 3, the sintering process parameters for hot isostatic pressing are: increasing the temperature to 900-950°C at a rate of 5-15°C / min, while simultaneously increasing the pressure inside the furnace to 120-200 MPa, and holding at the set temperature and pressure for 0.5-2 hours.

[0030] Specifically, the above preparation method includes the following steps: Step 1: Mix continuous W fibers with a diameter of 50μm~200μm with Cu alloy fibers and perform three-dimensional five-directional weaving. During the weaving process, Cu alloy fibers are used as axial yarns and W fibers are used as braiding yarns. The braiding yarns interweave in three-dimensional space and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 10 vol.%~45 vol.%. Step 2: The W fiber braid obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 2: The fiber braid obtained in Step 2 is loaded into a sleeve and filled with spherical copper alloy powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10-3Pa and placed into the high-pressure cylinder of a hot isostatic press. After the furnace is closed, inert gas is introduced into the cylinder and the temperature is raised to 900~950℃ at a rate of 5~15℃ / min. At the same time, the pressure in the furnace is raised to 120~200MPa. The temperature and pressure are maintained for 0.5~2h, and then cooled to room temperature, depressurized and removed to obtain W fiber reinforced copper matrix composite material.

[0031] This invention selects W fibers, which are immiscible with copper, as the reinforcing phase. W fibers possess high melting point, high hardness, and low coefficient of thermal expansion, exhibiting stable chemical properties, high specific strength, and high specific modulus. Through three-dimensional weaving, a non-layered continuous fiber preform can be obtained. The hot isostatic pressing method not only achieves high density but also allows the copper matrix softened under high pressure to bond tightly with the W fibers, improving interfacial bonding strength and enabling more effective load transfer, thus fully utilizing the reinforcing effect of the fibers.

[0032] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0033] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0034] Example 1 A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material includes the following steps: Step 1, Weaving: Continuous W fibers with a diameter of 50μm are mixed with continuous Cu fibers with a diameter of 50μm and woven in three dimensions and five directions. During the weaving process, Cu alloy fibers are used as axial yarns and W fibers are used as weaving yarns. The weaving yarns are interwoven in three dimensions and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 45 vol.%. Step 2: The W fiber braided skeleton obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 3: The fiber braid obtained in Step 2 is placed into a casing and filled with spherical copper powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10⁻⁶. -3 After Pa, the material is placed in the high-pressure cylinder of a hot isostatic press. After the furnace is closed, inert gas is introduced into the cylinder, and the temperature is raised to 900°C at a rate of 10°C / min. At the same time, the pressure inside the furnace is raised to 200 MPa. The material is kept at the set temperature and pressure for 1 h, and then cooled to room temperature to depressurize and remove the material, thus obtaining a three-dimensional braided W fiber reinforced copper matrix composite material.

[0035] Example 2 Unlike Example 1, in this example, the temperature of hot isostatic pressing sintering is 920°C, and the other parameters and preparation steps are the same as in Example 1, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0036] Example 3 Unlike Example 1, in this example, the temperature of hot isostatic pressing sintering is 930°C, and the other parameters and preparation steps are the same as in Example 1, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0037] Example 4 Unlike Example 1, in this example, the temperature of hot isostatic pressing sintering is 950°C, and the other parameters and preparation steps are the same as in Example 1, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0038] Example 5 A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material includes the following steps: Step 1, Weaving: Continuous W fibers with a diameter of 50μm are mixed with continuous Cu fibers with a diameter of 50μm and woven in three dimensions and five directions. During the weaving process, Cu alloy fibers are used as axial yarns and W fibers are used as weaving yarns. The weaving yarns are interwoven in three dimensions and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 45 vol.%. Step 2: The W fiber braided skeleton obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 3: The fiber braid obtained in Step 2 is placed into a casing and filled with spherical copper powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10⁻⁶. -3 After Pa, the material is placed in the high-pressure cylinder of a hot isostatic press. After the furnace is closed, inert gas is introduced into the cylinder, and the temperature is raised to 950°C at a rate of 5°C / min, while the pressure inside the furnace is raised to 150 MPa. The material is held at the set temperature and pressure for 0.5 h, and then cooled to room temperature to depressurize and remove the material, thus obtaining a three-dimensional braided W fiber reinforced copper matrix composite material.

[0039] Example 6 Unlike Example 5, in this example, the heating rate is 15℃ / min, and the other parameters and preparation steps are the same as in Example 5, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0040] Example 7 A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material includes the following steps: Step 1, Weaving: Continuous W fibers with a diameter of 100μm are mixed with continuous Cu fibers with a diameter of 100μm and woven in three dimensions and five directions. During the weaving process, Cu fibers are used as axial yarns and W fibers are used as weaving yarns. The weaving yarns are interwoven in three dimensions and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 45 vol.%. Step 2: The W fiber braided skeleton obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 3: The fiber braid obtained in Step 2 is placed into a casing and filled with spherical copper-chromium-zirconium powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10⁻⁶. -3After Pa, the material is placed in the high-pressure cylinder of a hot isostatic press. After the furnace is closed, inert gas is introduced into the cylinder, and the temperature is raised to 950°C at a rate of 10°C / min. At the same time, the pressure inside the furnace is raised to 120 MPa. The material is kept at the set temperature and pressure for 1 h, and then cooled to room temperature to depressurize and remove the material, thus obtaining a three-dimensional braided W fiber reinforced copper matrix composite material.

[0041] Example 8 Unlike Example 7, the Cu alloy fiber used in this example is CuCrZr fiber. The other parameters and preparation steps are the same as in Example 7, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0042] Example 9 A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material includes the following steps: Step 1, Weaving: Continuous W fibers with a diameter of 100μm are mixed with continuous CuCrZr fibers with a diameter of 100μm and woven in three dimensions and five directions. During the weaving process, CuCrZr fibers are used as the axial yarn and W fibers are used as the weaving yarn. The weaving yarns are interwoven in three dimensions and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 45 vol.%. Step 2: The W fiber braided skeleton obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 3: The fiber braid obtained in Step 2 is placed into a casing and filled with spherical copper-chromium-zirconium powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10⁻⁶. -3 After Pa, the material was placed in the high-pressure cylinder of a hot isostatic press. After the furnace was closed, inert gas was introduced into the cylinder, and the temperature was raised to 950°C at a rate of 15°C / min. At the same time, the pressure inside the furnace was raised to 150 MPa. The material was kept at the set temperature and pressure for 2 hours, and then cooled to room temperature to depressurize and remove the material, thus obtaining a three-dimensional braided W fiber reinforced copper matrix composite material.

[0043] Example 10 The difference from Example 9 is that the diameter of the W fiber in this example is 150 μm, while the other parameters and preparation steps are the same as in Example 9, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0044] Example 11 Unlike Example 9, in this example, the diameter of the W fiber is 200 μm, and the other parameters and preparation steps are the same as in Example 9, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0045] Example 12 A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material includes the following steps: Step 1, Weaving: Continuous W fibers with a diameter of 50 μm are mixed with CuCrZr fibers and woven in three dimensions and five directions. During the weaving process, CuCrZr fibers are used as the axial yarn and W fibers are used as the weaving yarn. The weaving yarns are interwoven in three dimensions and the axial yarns are tightened on the surface of the mandrel to obtain a circular cross-section fiber preform with a W fiber volume fraction of 10 vol.%. Step 2: The W fiber braided skeleton obtained in Step 1 is ultrasonically cleaned in a solution with a ratio of NH3•H2O:H2O2:H2O=1:4:5, and then ultrasonically cleaned with anhydrous ethanol to remove impurities from the fiber surface. Step 3: The fiber braid obtained in Step 2 is placed into a casing and filled with spherical copper-chromium-zirconium powder with a particle size of 50~100μm. Then, the vacuum degree is ≤1×10⁻⁶. -3 After being placed in the high-pressure cylinder of a hot isostatic press, the furnace was closed and inert gas was introduced into the cylinder. The temperature was increased to 950°C at a rate of 10°C / min, while the pressure inside the furnace was increased to 120 MPa. The mixture was held at the set temperature and pressure for 2 hours, then cooled to room temperature, depressurized, and removed to obtain a three-dimensional braided W-fiber reinforced copper matrix composite material. The W-fiber reinforced copper matrix composite material prepared in this example has a strength of 480 MPa, a conductivity of 71.3% IACS, and a stress-strain curve as shown below. Figure 2 The conductivity shown is 71.3% IACS.

[0046] Example 13 Unlike Example 12, in this example, a circular cross-section fiber preform with a W fiber volume fraction of 20 vol.% was used, and the remaining parameters and preparation steps were the same as in Example 12, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0047] Example 14 Unlike Example 12, in this example, a circular cross-section fiber preform with a W fiber volume fraction of 35 vol.% was used, and the remaining parameters and preparation steps were the same as in Example 12, resulting in a three-dimensional braided W fiber reinforced copper matrix composite material.

[0048] Figure 1 This is a schematic diagram of the fiber braid skeleton structure obtained after three-dimensional five-directional weaving as described in this invention. The center consists of axial yarns, surrounded by braided yarns. These braided yarns extend and interweave in four specific directions in space, forming a non-layered integral structure. Because high-strength, high-melting-point W fibers serve as the reinforcing phase, the bridging effect of continuous fibers effectively improves the strength of the composite material under stress, while simultaneously ensuring its good electrical conductivity.

[0049] This invention discloses a method for preparing a three-dimensional braided W fiber reinforced copper matrix composite material. W and Cu fibers are braided in three dimensions to obtain a fiber preform, which is then cleaned to remove surface impurities. The preform is sintered using hot isostatic pressing (HIP) to obtain the W fiber reinforced copper matrix composite material. The process parameters are continuously optimized by changing the sintering temperature, sintering pressure, heating rate, holding time, and W fiber volume fraction. Based on the excellent high-temperature performance of W fibers, their continuous structure, and the high density after HIP, not only is the electrical conductivity of the composite material guaranteed, but its strength is also improved to meet the performance requirements of special applications.

[0050] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material, characterized in that, Includes the following steps: S1: A continuous set of W fibers and a continuous set of Cu alloy fibers are woven in three dimensions to obtain a fiber-woven preform; S2: After cleaning the fiber braid skeleton, it is mixed with copper alloy powder and then subjected to hot isostatic pressing sintering in an inert gas atmosphere. The sintering temperature of the hot isostatic pressing sintering treatment is 900~950℃.

2. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The specific steps of the three-dimensional weaving are as follows: A three-dimensional five-dimensional structure is adopted, in which a continuous set of W fibers and a continuous set of Cu alloy fibers are mixed and woven. During the mixed weaving process, Cu alloy fibers are used as axial yarns and W fibers are used as weaving yarns. The weaving yarns interweave in three-dimensional space to create a prefabricated body with a circular cross section. The group consists of a single continuous fiber or multiple continuous fibers of the same length.

3. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The diameter of the W fiber is 50~200μm; the diameter of the Cu alloy fiber is 50~200μm.

4. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The alloy type of the Cu alloy fiber is Cu fiber or CuCrZr fiber.

5. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The integral number of W fibers in the fiber-woven preform is 10 vol% to 45 vol.

6. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The cleaning process involves two separate cleaning operations. The first cleaning uses a cleaning solution with a volume ratio of NH3•H2O:H2O2:H2O = 1:4:

5. The second cleaning uses anhydrous ethanol as the cleaning solution.

7. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The specific steps for mixing the fiber-woven skeleton with copper alloy powder after cleaning are as follows: The fiber-woven preform is placed into a sleeve, then filled with copper alloy powder, and then vacuumed. The volume of the sheath is 10% larger than the volume of the fiber-woven preform; Evacuate to a vacuum level ≤1×10 -3 Pa.

8. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The copper alloy powder is spherical copper powder or copper-chromium-zirconium powder with a particle size of 50~100μm.

9. The method for preparing a three-dimensional braided W-fiber reinforced copper matrix composite material according to claim 1, characterized in that, The process parameters for the hot isostatic pressing sintering treatment are as follows: The temperature is increased to 900-950℃ at a rate of 5-15℃ / min, while the pressure inside the furnace is increased to 120-200 MPa, and then held at the set temperature and pressure for 0.5-2 h.

10. A three-dimensional braided W-fiber reinforced copper-based composite material, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 9.

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