Tungsten carbide grain reinforced tungsten copper alloy and method for preparing the same

Abstract

The application discloses a tungsten-copper alloy reinforced by tungsten carbide grains and a preparation method thereof, and the method comprises the following steps: (1) drying carbon-modified tungsten-copper composite powder and placing the powder in a mold of a tablet press; (2) applying pressure to the powder in the step (1) to press a green body; (3) performing high-temperature sintering on the green body obtained in the step (2) under an argon atmosphere to obtain the tungsten-copper alloy reinforced by tungsten carbide grains; and (4) performing mechanical processing on the tungsten-copper alloy to manufacture an electric contact of a circuit breaker. Thus, the tungsten-copper alloy is prepared by the method, in-situ carburization of tungsten surface is performed by using carbon without additional tungsten carbide grains, and abnormal growth of the tungsten carbide grains in the sintering process is effectively slowed down; a small amount of in-situ generated tungsten carbide grains avoids the limitation of unqualified indexes such as alloy brittleness and low density caused by unevenness of traditional additional tungsten carbide grains, and the prepared tungsten-copper alloy has high strength, high wear resistance and high-temperature ablation resistance.

Description

Technical Field

[0001] This invention pertains to tungsten-copper alloys, specifically relating to a tungsten carbide grain-reinforced tungsten-copper alloy and its preparation method. Background Technology

[0002] Due to the significant differences in melting points and physical properties between tungsten and copper, and their immiscibility, the tungsten-copper interface exhibits poor wettability, making densification difficult during sintering and hindering the attainment of ideal microstructure and properties. This imposes numerous limitations on the preparation process and performance research of tungsten-copper alloys. Traditional alloy preparation methods struggle to achieve effective composite composition of copper and tungsten. Based on these issues, many new preparation methods have emerged for hard alloys with significant property differences between tungsten and copper, such as infiltration sintering, high-temperature liquid phase sintering, spark plasma sintering, and powder injection molding. Currently, tungsten-copper alloys are generally prepared using a tungsten framework-induced copper infiltration method. This method offers advantages such as simple preparation principles, ease of mass production, and high alloy density. However, it requires sophisticated machinery, and the tungsten powder is prone to uneven porosity during pressing, leading to either inability or uneven infiltration of liquid copper during subsequent sintering. A search of existing technical literature revealed that Chinese invention patent CN117230338 A discloses a "Preparation method of tungsten-copper alloy electrical contacts synergistically reinforced by graphene and nano-tungsten carbide." This method involves mixing graphene powder, nano-tungsten carbide powder, and tungsten powder, followed by hot pressing and sintering to form a tungsten framework. Subsequently, a copper block is placed on the surface of the tungsten framework at high temperature for copper infiltration. This invention uses graphene and nano-tungsten carbide as additive phases. Graphene can improve the density and hardness of the tungsten-copper alloy, while tungsten carbide disperses within the tungsten matrix, effectively dispersing the electric arc. The tungsten-copper alloy is thus synergistically reinforced by graphene and tungsten carbide. However, this method has shortcomings. It cannot guarantee uniform copper infiltration, and it is unclear whether the graphene exists on the surface of the powder or penetrates into the interior of the metal. If the graphene is grown on the surface, phase separation is likely to occur when the powder melts. Whether the graphene, after agglomerating, can penetrate into the tungsten framework will affect the density of the tungsten-copper alloy. Therefore, existing technologies for enhancing tungsten-copper alloys with graphene and tungsten carbide grains need to be improved. Summary of the Invention

[0003] The purpose of this invention is to provide a tungsten carbide grain-reinforced tungsten-copper alloy that can effectively slow down the abnormal growth of tungsten carbide grains during the sintering process of tungsten-copper composite powder by utilizing the advantage of in-situ carburization of an ultra-thin carbon layer on the surface of tungsten powder without adding tungsten carbide grains. This avoids the limitations caused by excessive tungsten carbide grain addition, such as the alloy's brittleness and low density, and the resulting tungsten-copper alloy has high strength, high wear resistance, and high-temperature ablation resistance.

[0004] Another object of the present invention is to provide a method for preparing tungsten carbide grain-reinforced tungsten-copper alloy.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] A tungsten carbide grain-reinforced tungsten-copper alloy is prepared sequentially by the following method:

[0007] (1) After drying, the carbon-modified tungsten copper composite powder is placed in the mold of the tablet press;

[0008] (2) Apply pressure to the powder obtained in step (1) and press it into a green embryo;

[0009] (3) The green embryo in step (2) is sintered at high temperature under an argon atmosphere to obtain a tungsten carbide grain-reinforced tungsten copper alloy.

[0010] The tungsten carbide grain-reinforced tungsten-copper alloy obtained according to the present invention can be obtained by drying carbon-modified tungsten-copper composite powder, placing it in a mold, and sintering the mold containing the carbon-modified tungsten-copper composite powder at high temperature under argon protection. The present invention uses carbon-modified tungsten-copper composite powder as the only raw material and combines it with high-temperature solid-state sintering technology to prepare tungsten-copper alloy, which has the following advantages: (1) The carbon layer grown in situ on the surface of the tungsten-copper composite powder can not only promote the in-situ carburization of the tungsten surface during sintering, but also generate a small amount of tungsten carbide grains in situ and disperse them in the tungsten-copper matrix, which can significantly enhance the mixing uniformity between the composite powders. By generating tungsten carbide grains in situ on the surface of the carbon-modified tungsten-copper composite powder, on the one hand, the carbon layer effectively strengthens the surface bonding force between tungsten carbide, tungsten and copper during sintering, which can effectively slow down the agglomeration of tungsten-copper composite powder during sintering. On the other hand, the carbon layer, as free carbon, can be used to carbonize tungsten and generate some tungsten carbide particles. In addition, the thickness and carbon content of the carbon layer in the tungsten-copper composite powder can be adjusted to meet the requirements for preparing alloys with different properties. (2) Since the present invention does not require the addition of tungsten carbide as a grain reinforcing agent, it can effectively avoid the limitations of unqualified indicators such as alloy brittleness and low density caused by excessive addition of grain reinforcing agent. (3) The existing technology of adding graphene and tungsten carbide to tungsten-copper composite powder and combining it with high-temperature sintering process to prepare tungsten-copper alloy has the limitations of complex ball milling process of graphene and tungsten carbide and the inability of graphene and tungsten carbide to be uniformly mixed with tungsten-copper composite powder. However, the present invention uses carbon-modified tungsten-copper composite powder as the only raw material for preparing tungsten carbide grain-reinforced tungsten-copper alloy, which eliminates the high-energy ball milling mixing process, making the process simpler, and the uniformity of the tungsten-copper alloy with uniformly mixed tungsten carbide particles is better. Therefore, the tungsten-copper alloy obtained by the present invention has high hardness, friction resistance and ablation resistance.

[0011] In addition, the present invention may also have the following additional technical features:

[0012] In step (1), the total carbon content of the tungsten-copper composite powder is 0.1~1 wt%. This not only effectively slows down the abnormal growth of tungsten and copper grains during sintering, but also allows for carbon matching of tungsten in the tungsten-copper composite powder, controlling the WC grain content to be 0.5%~3 wt%.

[0013] In step (1), the free carbon content of the carbon-modified tungsten-copper composite powder is 0.01~0.5 wt%. This is beneficial to improving the density and hardness of the alloy.

[0014] In step (1), the thickness of the carbon layer in the carbon-modified tungsten copper composite powder is 1~10 nm.

[0015] In step (1), the tungsten powder particles of the carbon-modified tungsten-copper composite powder have a size of 2~10μm and the copper powder particles have a size of 10~25μm, allowing for better contact between the two powder particles.

[0016] In step (1), the mass ratio of tungsten powder to copper powder in the carbon-modified tungsten-copper composite powder is 8:2 to 6:4. This allows the tungsten framework to function more effectively.

[0017] In step (2), the inner wall of the mold must be wiped clean with anhydrous ethanol and then dried. This prevents the mold from causing component contamination to the tungsten copper green blank.

[0018] In step (2), the pressing pressure of the carbon-modified tungsten-copper composite powder in the mold is 30-40 MPa. This ensures that its size and shape remain unchanged under high stress.

[0019] In step (2), the pressing time of the carbon-modified tungsten-copper composite powder in the mold is 5~30 min. Therefore, its size and shape can be kept unchanged under a certain time.

[0020] Step (3) includes: placing the mold containing the carbon-modified tungsten-copper composite powder green stock obtained in step (2) into a sintering chamber, with an initial pressure of 0~20 MPa in the sintering chamber. Then, under an argon atmosphere, the temperature is increased to 1~10℃ for min. -1 The temperature is increased to 850~1000℃ at a constant rate, held for 30~120 min, and then increased at a rate of 1~10℃ / min. -1 The temperature drops to 600°C, the program stops running, and then the furnace is cooled to room temperature before the sample is removed.

[0021] The tungsten carbide grain-reinforced tungsten-copper alloy obtained by this invention can be machined according to customized size drawings, thereby obtaining tungsten-copper alloy electrical contacts with high strength, high wear resistance, and high temperature erosion resistance.

[0022] A method for preparing a tungsten carbide grain-reinforced tungsten-copper alloy, comprising the following steps:

[0023] (1) After drying, the carbon-modified tungsten copper composite powder is placed in the mold of the tablet press;

[0024] (2) Apply pressure to the powder obtained in step (1) and press it into a green embryo;

[0025] (3) The green embryo in step (2) is sintered at high temperature under an argon atmosphere to obtain a tungsten carbide grain-reinforced tungsten copper alloy.

[0026] In addition, the present invention may also have the following additional technical features:

[0027] In step (1), the total carbon content of the tungsten-copper composite powder is 0.1~1 wt%. This not only effectively slows down the abnormal growth of tungsten and copper grains during sintering, but also allows for carbon matching of tungsten in the tungsten-copper composite powder, controlling the WC grain content to be 0.5%~3 wt%.

[0028] In step (1), the free carbon content of the carbon-modified tungsten-copper composite powder is 0.01~0.5 wt%. This is beneficial to improving the density and hardness of the alloy.

[0029] In step (1), the thickness of the carbon layer in the carbon-modified tungsten copper composite powder is 1~10 nm.

[0030] In step (1), the tungsten powder particles of the carbon-modified tungsten-copper composite powder have a size of 2~10μm and the copper powder particles have a size of 10~25μm, allowing for better contact between the two powder particles.

[0031] In step (1), the mass ratio of tungsten powder to copper powder in the carbon-modified tungsten-copper composite powder is 8:2 to 6:4. This allows the tungsten framework to function more effectively.

[0032] In step (2), the inner wall of the mold must be wiped clean with anhydrous ethanol and then dried. This prevents the mold from causing component contamination to the tungsten copper green blank.

[0033] In step (2), the pressing pressure of the carbon-modified tungsten-copper composite powder in the mold is 30-40 MPa. This ensures that its size and shape remain unchanged under high stress.

[0034] In step (2), the pressing time of the carbon-modified tungsten-copper composite powder in the mold is 5~30 min. Therefore, its size and shape can be kept unchanged under a certain time.

[0035] Step (3) includes: placing the mold containing the carbon-modified tungsten-copper composite powder green stock obtained in step (2) into a sintering chamber, with an initial pressure of 0~20 MPa in the sintering chamber. Then, under an argon atmosphere, the temperature is increased to 1~10℃ for min. -1 The temperature is increased to 850~1000℃ at a constant rate, held for 30~120 min, and then increased at a rate of 1~10℃ / min. -1 The temperature drops to 600°C, the program stops running, and then the furnace is cooled to room temperature before the sample is removed.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] Figure 1 These are metallographic diagrams of the tungsten-copper alloys obtained in Examples 1-4.

[0038] Figure 2 This is a comparison of the mechanical properties of the tungsten-copper alloys obtained in Examples 1-4. Detailed Implementation

[0039] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0040] This invention proposes a method for preparing tungsten carbide grain-reinforced tungsten-copper alloys. According to an embodiment of the invention, the method includes:

[0041] Step (1): After drying, the carbon-modified tungsten-copper composite powder is placed in a tablet press mold and pressure is applied to press it into a green compact. In this step, the weighed carbon-modified tungsten-copper composite powder is first placed in a vacuum drying oven (a conventional device in the art) for drying treatment, and then the dried carbon-modified tungsten-copper composite powder is filled into a cylindrical mold with an internal cavity diameter of 20-50 mm. The inventors have found that the carbon layer grown in situ on the surface of the tungsten-copper composite powder can not only promote in-situ carburization of the tungsten surface during sintering, but also generate a small amount of tungsten carbide grains in situ and disperse them in the tungsten matrix, which can significantly enhance the mixing uniformity between the composite powders. By growing a carbon layer in situ on the surface of the tungsten-copper composite powder, on the one hand, the carbon layer effectively strengthens the surface bonding force between tungsten carbide, tungsten and copper during sintering, which can effectively slow down the significant agglomeration of the tungsten-copper composite powder during sintering. On the other hand, the carbon layer, as free carbon, can carbonize tungsten, generating tungsten carbide grains in situ. Furthermore, the thickness and carbon content of the carbon layer in the carbon-modified tungsten-copper composite powder can be adjusted to achieve the desired alloy properties. Further, the total carbon content of the aforementioned carbon-modified tungsten-copper composite powder is 0.1–1 wt%. The free carbon content is 0.01–0.5 wt%. The carbon layer thickness is 0–10 nm, preferably 3–5 nm. The tungsten powder particle size is 2–10 μm, and the copper powder particle size is 10–25 μm.

[0042] Step (2): Under an argon atmosphere, the mold containing the carbon-modified tungsten copper composite powder obtained in step (1) is subjected to high-temperature solid-state sintering.

[0043] In this step, under an argon atmosphere, the mold containing the carbon-modified tungsten-copper composite powder obtained in step (1) is subjected to high-temperature solid-state sintering to obtain the tungsten-copper alloy, which is then machined. Preferably, this process is carried out in a high-temperature sintering furnace, and the specific type of sintering furnace is not particularly limited, as long as it can achieve the above-mentioned functions.

[0044] Further, the mold containing the carbon-modified tungsten-copper composite powder obtained in step (1) is placed in the sintering chamber, and the initial pressure in the sintering chamber of the sintering furnace is 0~20MPa. Argon gas is then introduced, and then the temperature is increased to 1~10℃ for min. -1 Preferably 5~10℃ min -1 Heat to 850~1000℃ at a rapid rate, hold for 30~120 min, and after holding, use 1~10℃ min. -1The program stops running when the temperature drops to 600°C, and then the sample is cooled to room temperature in the furnace before being removed. On one hand, if the powder compact contains two or more components, and the sintering temperature is above the melting point of one of the components, a small amount of liquid phase appears in the powder compact during sintering. The inventors discovered that when sintering carbon-modified tungsten-copper composite powder, if the sintering temperature is higher than the melting point of copper, the copper melts into a liquid state and leaks out from the pores on the surface of the compact. This phenomenon leads to severe deformation and cracking of the sample. Therefore, the sintering temperature of this invention is set below the melting point of the composite powder. On the other hand, slowing down the cooling rate eliminates the internal stress of the sample by extending the cooling time, preventing cracks from appearing after the sample cools.

[0045] The method of the present invention uses carbon-modified tungsten-copper composite powder as the sole raw material and combines it with high-temperature solid-state sintering technology to prepare tungsten-copper alloys, which has the following advantages: (1) The carbon layer grown in situ on the surface of the tungsten-copper composite powder can not only promote in-situ carburization on the tungsten surface during sintering, but also generate a small amount of tungsten carbide grains in situ and disperse them in the tungsten matrix, which can significantly enhance the mixing uniformity between the composite powders. By growing tungsten carbide in situ on the surface of the tungsten-copper composite powder, on the one hand, the carbon layer effectively strengthens the surface bonding force between tungsten carbide, tungsten and copper during sintering, which can effectively slow down the significant agglomeration of tungsten-copper composite powder particles during sintering. On the other hand, the carbon layer, as free carbon, can be used to carbonize tungsten and generate some tungsten carbide particles. In addition, the thickness and carbon content of the carbon layer in the tungsten-copper composite powder can be adjusted to meet the requirements for preparing alloys with different properties. (2) Since this application does not require the addition of tungsten carbide as a grain reinforcing agent, it can effectively avoid the limitations of unqualified indicators such as alloy brittleness and low density caused by excessive addition of grain reinforcing agent. (3) The existing technology of adding graphene and tungsten carbide to tungsten-copper composite powder and combining it with high-temperature sintering process to prepare tungsten-copper alloy has the limitations of complex ball milling process of graphene and tungsten carbide and the inability of graphene and tungsten carbide to be uniformly mixed with tungsten-copper composite powder. However, this invention uses carbon-modified tungsten-copper composite powder as the only raw material for preparing tungsten-copper alloy, which eliminates the high-energy ball milling mixing process, making the process simpler, and the tungsten-copper alloy with uniformly mixed tungsten carbide particles has better density. Therefore, the tungsten-copper alloy prepared by the method of this invention has high hardness, friction resistance and ablation resistance.

[0046] The embodiments of the present invention are described in detail below. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In addition, unless otherwise specified, all reagents used in the following embodiments are commercially available or can be synthesized according to the methods described herein or known to others. For reaction conditions not listed, they are also readily available to those skilled in the art. Example 1

[0047] Step (1): Place the tungsten-copper composite powder (60% tungsten content, average particle size: 2μm tungsten powder and 10μm copper powder) in a drying oven and dry it for 1 h. Then place it in a tablet press mold with a clean inner wall, an internal cavity diameter of 20 mm, and a maximum compressive strength of 100 MPa.

[0048] Step (2): The powder is pressed into a green embryo by applying a pressure of 35 MPa.

[0049] Step (3): Place the green embryo in the middle of the sintering furnace cavity, open the argon valve to introduce argon gas, and introduce argon gas at 10℃ / min. -1 The temperature was increased from room temperature to 900℃, held for 2 hours, and then increased at a rate of 10℃ per minute after the holding period. -1 When the cooling rate drops to 600℃, the program stops running, and then the furnace is cooled. The furnace is then removed and machined to obtain tungsten-copper alloy. Example 2

[0050] Step (1): The carbon-modified tungsten-copper composite powder (80% tungsten content, in-situ grown carbon layer, total carbon content of 0.5 wt%, free carbon content of 0.05 wt%, carbon layer thickness of 5 nm, average particle size of tungsten powder of 2 μm, average particle size of copper powder of 10 μm) was placed in a drying oven and dried for 1 h. Then it was placed in a tablet press mold with a clean inner wall, an internal cavity diameter of 20 mm, and a maximum compressive strength of 100 MPa.

[0051] Step (2): The powder is pressed into a green embryo by applying a pressure of 35 MPa.

[0052] Step (3): Place the green embryo in the middle of the sintering furnace cavity, open the argon valve to introduce argon gas, and simmer at 10°C / min. -1 The temperature was increased from room temperature to 850℃, held for 2 hours, and then increased at a rate of 10℃ per minute after the holding period. -1 When the cooling rate drops to 600℃, the program stops running. Then, the furnace is cooled to room temperature, and the alloy is removed for machining to obtain a tungsten carbide grain-reinforced tungsten-copper alloy. Example 3

[0053] Step (1): The carbon-modified tungsten-copper composite powder (70% tungsten content, in-situ grown carbon layer, total carbon content of 1wt%, free carbon content of 0.5wt%, carbon layer thickness of 10 nm, average particle size of tungsten powder of 5μm, average particle size of copper powder of 20μm) was placed in a drying oven and dried for 2 h. Then it was placed in a tablet press mold with a clean inner wall, an internal cavity diameter of 20 mm, and a maximum compressive strength of 100 MPa.

[0054] Step (2): The powder is pressed into a green embryo by applying a pressure of 40 MPa.

[0055] Step (3): Place the green embryo in the middle of the sintering furnace cavity, open the argon valve to introduce argon gas, and simmer at 5°C for 5 minutes. -1 The temperature was increased from room temperature to 950℃, held for 1.5 hours, and then increased at a rate of 5℃ per minute after the holding period. -1 When the cooling rate drops to 600℃, the program stops running. Then, the furnace is cooled to room temperature, and the alloy is removed for machining to obtain a tungsten carbide grain-reinforced tungsten-copper alloy. Example 4

[0056] Step (1): The carbon-modified tungsten-copper composite powder (60% tungsten content, in-situ grown carbon layer, total carbon content of 0.1 wt%, free carbon content of 0.01 wt%, carbon layer thickness of 1 nm, average particle size of tungsten powder of 10 μm, average particle size of copper powder of 25 μm) was placed in a drying oven and dried for 1 h. Then it was placed in a tablet press mold with a clean inner wall, an internal cavity diameter of 20 mm, and a maximum compressive strength of 100 MPa.

[0057] Step (2): The powder is pressed into a green embryo by applying a pressure of 30 MPa.

[0058] Step (3): Place the green embryo in the middle of the sintering furnace cavity, open the argon valve to introduce argon gas, and introduce argon gas at 1℃ / min. -1 The temperature was increased from room temperature to 1000℃, held for 0.5 hours, and then increased at a rate of 1℃ per minute after the holding period. -1 When the cooling rate drops to 600℃, the program stops running. Then, the furnace is cooled to room temperature, and the alloy is removed for machining to obtain a tungsten carbide grain-reinforced tungsten-copper alloy.

[0059] The properties of the tungsten-copper alloys prepared in Examples 1-4 are characterized as follows: Figure 1-2 As shown.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tungsten carbide grain-reinforced tungsten-copper alloy, characterized in that: It is obtained sequentially through the following methods: (1) After drying, the carbon-modified tungsten copper composite powder is placed in the mold of the tablet press; (2) Apply pressure to the powder obtained in step (1) and press it into a green body; (3) The green blank in step (2) is sintered at high temperature under an argon atmosphere to obtain a tungsten carbide grain-reinforced tungsten copper alloy; In step (1), the total carbon content of the carbon-modified tungsten-copper composite powder is 0.1~1 wt%; the free carbon content of the carbon-modified tungsten-copper composite powder is 0.01~0.5 wt%; the thickness of the carbon layer in the carbon-modified tungsten-copper composite powder is 1~10 nm; the tungsten powder particle size of the carbon-modified tungsten-copper composite powder is 2~10 μm, and the copper powder particle size is 10~25 μm; the mass ratio of tungsten powder to copper powder in the carbon-modified tungsten-copper composite powder is 8∶2~6∶4. In step (2), the pressing pressure of the carbon-modified tungsten copper composite powder in the mold is 30-40 MPa; the pressing time of the carbon-modified tungsten copper composite powder in the mold is 5-30 min. Step (3) includes: placing the mold containing the carbon-modified tungsten-copper composite powder green body obtained in step (2) into the sintering chamber, and then sintering it at 1~10°C for 1 minute under an argon atmosphere. -1 The temperature is increased to 850~1000°C and held for 30~120 minutes.

2. The tungsten carbide grain-reinforced tungsten-copper alloy according to claim 1, characterized in that: After heat preservation, maintain at 1~10°C for min -1 The temperature drops to 600°C, the program stops running, and then the furnace is cooled to room temperature before the sample is removed.

3. A method for preparing a tungsten carbide grain-reinforced tungsten-copper alloy, characterized in that: The following methods are used sequentially: (1) After drying, the carbon-modified tungsten copper composite powder is placed in the mold of the tablet press; (2) Apply pressure to the powder obtained in step (1) and press it into a green body; (3) The green blank in step (2) is sintered at high temperature under an argon atmosphere to obtain a tungsten carbide grain-reinforced tungsten copper alloy; In step (1), the total carbon content of the carbon-modified tungsten-copper composite powder is 0.1~1 wt%; the free carbon content of the carbon-modified tungsten-copper composite powder is 0.01~0.5 wt%; the thickness of the carbon layer in the carbon-modified tungsten-copper composite powder is 1~10 nm; the tungsten powder particle size of the carbon-modified tungsten-copper composite powder is 2~10 μm, and the copper powder particle size is 10~25 μm; the mass ratio of tungsten powder to copper powder in the carbon-modified tungsten-copper composite powder is 8∶2~6∶4. In step (2), the pressing pressure of the carbon-modified tungsten copper composite powder in the mold is 30-40 MPa; the pressing time of the carbon-modified tungsten copper composite powder in the mold is 5-30 min. Step (3) includes: placing the mold containing the carbon-modified tungsten-copper composite powder green body obtained in step (2) into the sintering chamber, and then sintering it at 1~10°C for 1 minute under an argon atmosphere. -1 The temperature is increased to 850~1000°C and held for 30~120 minutes.

4. The method for preparing a tungsten carbide grain-reinforced tungsten-copper alloy according to claim 3, characterized in that: After heat preservation, maintain at 1~10 °C for min -1 The temperature drops to 600°C, the program stops running, and then the furnace is cooled to room temperature before the sample is removed.

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