Nano-oxide dispersion-strengthened copper-based composite material and preparation method thereof

Abstract

The application discloses a kind of nano-oxide dispersion strengthened copper-based composite material and preparation method thereof, the preparation method includes the following steps: Cu-Me atomized alloy powder (Me is any one or more in Cr, Y and Al), H2O and H2O2 are placed in high temperature and high pressure reactor and are carried out supercritical water oxidation reaction, then after being filtered, vacuum drying, composite powder is obtained;After the composite powder treated by supercritical water oxidation technology is reduced, Cu-Me x O y Composite powder is obtained;Cu-Me x O y Composite powder is pressed into shape, and discharge plasma sintering is carried out, to obtain bulk Cu-Me x O y Copper-based composite material.The preparation method has the advantages of low preparation temperature, short process, environmental friendliness and low cost, and the oxide reinforcing phase in the prepared copper-based composite powder is nano-scale and dispersedly distributed, which provides a guarantee for obtaining high-strength, high-conductivity and high-heat-resistant copper-based composite material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of copper-based composite materials; more particularly, it relates to a copper-based composite material containing nano-oxide as a reinforcing phase and a preparation method thereof. BACKGROUND

[0002] Dispersion strengthened copper alloy is a new type of composite material with excellent comprehensive physical and mechanical properties, which usually uses oxide ceramic particles with high melting point, good high-temperature stability and high hardness, borides, nitrides, carbides, etc. as reinforcing phase for dispersion strengthening, and the obtained dispersion strengthened copper alloy has high strength and high conductivity and good high-temperature softening resistance.

[0003] Among them, the particle size, spacing, distribution uniformity of the dispersion reinforcing phase and the interface bonding mode with the copper matrix are important factors affecting its performance. The smaller the size and particle spacing of the reinforcing phase and the more uniform the distribution, the higher the comprehensive performance of the material. Oxide is the most commonly used reinforcing phase particle in dispersion strengthened copper alloy. Due to its small size and high melting point and good thermal stability, it will not dissolve or coarsen at high temperatures close to the melting point of the copper matrix, which can effectively hinder dislocation movement and grain boundary sliding, thereby significantly improving the room temperature and high temperature strength of the alloy, and has good high temperature creep resistance; at the same time, it does not significantly reduce the electrical conductivity of the alloy, and has high wear and corrosion resistance.

[0004] In recent years, with the rapid development and continuous improvement of technology in the fields of national defense, electronics information, rail transportation, etc., the demand for dispersion strengthened copper-based composite materials with excellent electrical conductivity, thermal conductivity, high room temperature / high temperature strength and hardness, and excellent high-temperature softening resistance is becoming more and more urgent. For example, in the application of high-voltage power supply electrical appliances such as circuit breakers and vacuum interrupters, the gas insulated switch of key conductive components requires high temperature performance, strength and electrical conductivity of the material.

[0005] The current preparation methods of oxide dispersion strengthened copper-based composite material mainly include internal oxidation method, powder metallurgy method, mechanical alloying method, etc. The material prepared by the internal oxidation method has the best performance, but the preparation temperature is high (generally greater than 900 DEG C), the reaction time is long, the enhanced phase is easy to produce reverse diffusion at high temperature and gather at the grain boundary, and the use of Cu2O as the oxygen source is easy to cause abnormal grain growth and uneven distribution of the enhanced phase, which deteriorates the performance of the material. For example, the hardness of the composite material obtained by using Cu-1.64wt%Cr as raw material is 100HB, and the electrical conductivity is 61%IACS; the hardness of the composite material prepared by using Cu-3.01wt%Cr as raw material is 113HB, and the electrical conductivity is 70%IACS. The hardness of the composite material obtained by using Cu-0.8wt%Cr through different internal oxidation time is between 90-110HV, the electrical conductivity is 55-71%IACS, and the tensile strength is 247-383MPa. However, the softening temperature of the above-mentioned composite material is relatively low, which is about 700 DEG C. Moreover, the preparation conditions have large energy consumption, long process and high cost.

[0006] Currently, the research on dispersion strengthened copper-based composite material mainly focuses on the related mechanism, internal oxidation thermodynamics and kinetics, and the internal relationship between performance and microstructure, and few people focus on the development and design of the preparation conditions, especially the improvement of the comprehensive performance of the composite material, especially the high-temperature performance, and the reduction of energy consumption, the shortening of the process and the reduction of the cost. Therefore, it is of great significance to develop a new green, short-process, low-energy-consumption and high-performance dispersion strengthened copper-based composite material preparation process. SUMMARY

[0007] Therefore, the application provides a nano-oxide dispersion strengthened copper-based composite material and a preparation method thereof. Compared with the traditional internal oxidation method, the key technology of the application is the supercritical water liquid phase in-situ oxidation reaction method, which has low reaction temperature, is green and pollution-free, has short process, and the oxide enhanced phase in the obtained composite material is in nano scale and uniformly distributed, and the copper powder grain size is also small, which is beneficial to further improve the performance of the copper-based composite material.

[0008] In order to achieve the purpose of the application, a first aspect of the application discloses a preparation method of a nano-oxide dispersion strengthened copper-based composite material, which comprises the following steps:

[0009] (1) supercritical water liquid phase oxidation: Cu-Me (Me is any one or more of Cr, Y and Al) atomized alloy powder, H2O and H2O2 are put into a high-temperature and high-pressure reaction kettle (supercritical reaction kettle) to carry out oxidation reaction under supercritical state, and then filtration and vacuum drying are carried out to obtain an oxidation powder;

[0010] (ii) roasting reduction: the composite powder after supercritical water oxidation (supercritical oxidation powder) is put into a tube furnace, and calcination reduction is carried out under a reducing atmosphere to obtain Cu-Me x O y composite powder;

[0011] (iii) spark plasma sintering: the Cu-Me x O y composite powder is pressed into a shape in a graphite mold, and then put into a sintering furnace to perform spark plasma sintering through a preset program, and a vacuum pump is used to extract the environment in the furnace to vacuum until the end of the sintering process; after the end, the furnace is cooled, and after cooling to room temperature, the Cu-Me x O y bulk composite material is obtained.

[0012] In the above technical solution, water is in a gas-liquid coexistence state under a supercritical state, is completely miscible with oxygen, and can make the oxidation reaction process proceed in a homogeneous phase. After supercritical oxidation, the reinforcing phase element Me in the raw material powder is oxidized to Me x O y , and a small amount of copper oxide appears, and Cu-Me x O y composite powder is finally obtained through subsequent roasting reduction.

[0013] Optionally, the Cu-Me atomized alloy powder is a Cu-Cr (Cr content of 0.8-4 wt.%) atomized alloy powder; the environmental temperature of the supercritical oxidation reaction is 390°C, the holding time is 10 min, and the pressure is 27 MPa.

[0014] Optionally, the Cu-Me atomized alloy powder is a Cu-Al (Al content of 0.32-0.6 wt.%) atomized alloy powder; the environmental temperature of the supercritical oxidation reaction is 380°C, the holding time is 10 min, and the pressure is 25 MPa.

[0015] Optionally, the Cu-Me atomized alloy powder is a Cu-Y (Y content of 1-5 wt.%) atomized alloy powder; the environmental temperature of the supercritical oxidation reaction is 390°C, the holding time is 10 min, and the pressure is 27 MPa.

[0016] Optionally, stirring is added during the supercritical water oxidation reaction process, and the stirring rate is 400-500 r / min.

[0017] Optionally, the mass ratio of the Cu-Me atomized alloy powder, water and H2O2 in step (i) is controlled to be 1:2:4.

[0018] Optionally, in step (i), the vacuum degree of vacuum drying is 10 -5Pa or less, the drying temperature and holding time are 60-80 DEG C, 6-8h respectively.

[0019] Optionally, in step (two), after the tubular furnace reaches the vacuum environment, the temperature is increased from room temperature to 500 DEG C at a rate of 5-10 DEG C / min and held for 3h, and the program stops and the powder is cooled to room temperature with the furnace.

[0020] Optionally, in step (three), the sintering pressure of the spark plasma sintering is 30-40 MPa, the heating rate is 90-100 DEG C / min, the sintering temperature is 800-900 DEG C, and after holding for 10 min at the sintering temperature, the furnace is cooled to room temperature.

[0021] The second aspect of the present application discloses a nano-oxide dispersion strengthened copper-based composite material prepared by the above preparation method.

[0022] The technical scheme of the present application has the following beneficial effects:

[0023] 1. Compared with the traditional internal oxidation method, the supercritical water liquid phase in-situ oxidation reaction temperature is significantly reduced, the whole reaction process is green and environmentally friendly without secondary pollution, the energy consumption is greatly reduced, and the industrial production cost is saved.

[0024] 2. Using H2O2 as the oxygen source, H2O2 is decomposed into water and oxygen in the supercritical state, without introducing new impurities; during the reaction process, water is in a gas-liquid coexistence state and is completely miscible with oxygen, so that the raw material powder undergoes a low-temperature liquid phase in-situ oxidation reaction process in a homogeneous phase and the reaction is rapid, and the problems of reverse diffusion of the strengthening phase, easy enrichment at the copper grain boundary and abnormal grain growth caused by using Cu2O as the oxygen source in the traditional internal oxidation method are avoided, and the generated Me x O y (Me is any one or more of Cr, Y and Al) strengthening phase has a fine size of nanoscale and is uniformly dispersed, which not only inhibits the coarsening of copper grains during sintering, but also reduces the influence on electron scattering and maintains the high conductivity of the material, so that the prepared bulk copper-based composite material has excellent properties of high strength, high conductivity and high heat resistance, and is especially beneficial to improving the high-temperature softening temperature of the material. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the process route map of the preparation method embodiment of the present application;

[0026] Figure 2 In the middle: a and c are SEM images of Cu-0.32wt% Al atomized alloy powder before and after oxidation in Example 3, and b and d are SEM images of Cu-0.6wt% Al atomized alloy powder before and after oxidation in Example 4;

[0027] Figure 3 Fig. 1 is SEM images of Cu-1.2wt%Cr atomized alloy powder before and after oxidation in Example 1, and Fig. 2 is SEM images of Cu-3.2wt%Cr atomized alloy powder before and after oxidation in Example 2;

[0028] Figure 4 Fig. 3 is XRD pattern of Cu-Al2O3 composite powder after extraction (removal of Cu oxide) in Example 3, and Fig. 4 is XRD pattern of Cu-Cr2O3 sintered sample in Example 1.

[0029] Figure 5a Fig. 5 is SEM images and element distribution maps of Cu-Al2O3 sintered sample in Example 3.

[0030] Figure 5b Fig. 6 is SEM images and element distribution maps of Cu-Al2O3 sintered sample in Example 4.

[0031] Figure 5c Fig. 7 is SEM images and element distribution maps of Cu-Cr2O3 sintered sample in Example 1.

[0032] Figure 5d Fig. 8 is SEM images and element distribution maps of Cu-Cr2O3 sintered sample in Example 2.

[0033] Figure 6a Fig. 9 is TEM images of Cu-Al2O3 sintered sample in Example 4 and particle size statistics of Al2O3 reinforcing phase therein.

[0034] Figure 6b Fig. 10 is TEM images of Cu-Cr2O3 sintered sample in Example 2 and particle size statistics of Cr2O3 reinforcing phase therein. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely in combination with the examples below. Obviously, the described examples are only some of the examples of the present application, but not all the examples. Based on the examples in the present application, all the other examples obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] Example 1

[0037] Example 1 uses Cu-1.2wt%Cr atomized alloy powder as raw material, and the morphology of the powder raw material is shown in Fig. 1a, with an average particle size of 110 μm and peak particle sizes of 55.70 μm and 169.83 μm, respectively. Figure 3 The process flow of Example 1 can refer to Fig. 2, and the specific description is as follows: Figure 1

[0038] ​The Cu-1.2wt%Cr alloy powder, H2O and H2O2 were put into a supercritical reactor in a mass ratio of 1:2:4 to carry out supercritical oxidation reaction, and stirring was carried out at a rate of 400 r / min during the reaction. The supercritical oxidation reaction process parameters are as follows: the temperature is 390°C, the holding time is 10 min, and the pressure condition is 27 Mpa. After supercritical oxidation, the reinforcing phase element Cr in the raw material powder is oxidized to Cr2O3 in situ, and a small amount of copper oxide appears.

[0039] The supercritical water oxidation product was subjected to suction filtration and vacuum drying to obtain an oxidation powder. The vacuum drying degree is 10 Pa below, and the drying temperature and holding time are 60°C and 6h, respectively. -5 Figure 3 b is the SEM image of the oxidation powder, and the comparison Figure 3 As can be seen from FIGS. 3a and 3b, after supercritical water oxidation, the powder surface appears reinforcing phase particles, and the distribution is uniform, which lays a good foundation for improving the material performance.

[0040] The dried supercritical oxidation powder was placed in a tube furnace in a H2 atmosphere to carry out calcination reduction, and Cu-Cr2O3 composite powder was obtained. Specifically, after the tube furnace reached a vacuum environment, argon and hydrogen were introduced, the temperature was increased from room temperature to 500°C at a rate of 10°C / min and held for 3h, and the program stopped. The powder was cooled to room temperature with the furnace.

[0041] The Cu-Cr2O3 composite powder obtained after calcination reduction was placed in a graphite mold with a diameter of 20 mm, sealed by wrapping the pressure head with graphite paper, and pressed into shape by external force, then placed in a sintering furnace to carry out spark plasma sintering by pre-set program, and the vacuum pump was used to extract the environment in the furnace to vacuum until the end of the sintering process. After cooling to room temperature, Cu-Cr2O3 bulk composite material can be obtained. The spark plasma sintering process parameters are as follows: sintering pressure is 30 MPa, heating rate is 100°C / min, sintering temperature is 800°C, and holding time at sintering temperature is 10 min.

[0042] Figure 4 b is the XRD pattern of the sintered Cu-Cr2O3 sample in Example 1, Figure 5c The element distribution of the Cu-Cr2O3 sintered sample in Example 1 is shown, and it can be seen that the distribution of the reinforcing phase elements in the copper matrix is very uniform, which helps to inhibit the coarsening of copper grains during sintering. The prepared bulk copper-based composite material has excellent properties of high strength, high conductivity and high heat resistance. Specifically, the sintered sample of Example 1 was tested, and the density was 99.2%, the tensile strength and hardness were 306.11 MPa and 104.9HV, respectively, the electrical conductivity was 76.4%IACS, and the high temperature softening temperature was 900°C.​

[0043] Example 2

[0044] Example 2 is different from Example 1 in that Cu-3.2wt%Cr atomized alloy powder is used as raw material in Example 2, Figure 3 Fig. 2 and Fig. 3 are SEM images of Cu-3.2wt%Cr atomized alloy powder before and after oxidation in Example 2, respectively.

[0045] Figure 5c Fig. 4 shows the element distribution of Cu-Cr2O3 sample in Example 2, it can be seen that the distribution of reinforcing phase elements in copper matrix is very uniform. Figure 6b Fig. 5 is a TEM image of Cu-Cr2O3 sintered sample in Example 2 and a particle size statistical diagram of Cr2O3 reinforcing phase therein, it can also be seen that Cr2O3 reinforcing phase is also uniformly dispersed in copper matrix, and the average size is only about 12 nm.

[0046] The sintered sample of Example 2 is tested, and the results are as follows: the density is 98.7%, the tensile strength and hardness are 338.49 MPa and 121.7 HV respectively, the electrical conductivity is 73.4% IACS, and the high temperature softening temperature is 900°C.

[0047] From the comparison between Example 2 and Example 1, it can be seen that with the increase of the content of Cr2O3 reinforcing phase, the supersaturated reinforcing phase elements are precipitated, and the tensile strength and hardness of the material are further improved.

[0048] Example 3

[0049] Example 3 uses Cu-0.32wt%Al atomized alloy powder as raw material, and the morphology of the powder raw material is as shown in Fig. 6a, the average particle size is 40 μm, and the peak particle size is 30 μm and 45 μm respectively. Figure 2 The process flow of Example 3 can refer to Fig. 6b, and the specific description is as follows: Figure 1

[0050] The Cu-0.32wt%Al alloy powder, H2O and H2O2 are put into the supercritical reactor in a mass ratio of 1:2:4 for supercritical oxidation reaction, and stirring is carried out at a speed of 500 r / min during the reaction. The process parameters of supercritical oxidation reaction are as follows: the temperature is 380°C, the holding time is 10 min, and the pressure condition is 25 MPa. After supercritical oxidation, the reinforcing phase element Al in the raw material powder is in-situ oxidized to Al2O3, and a small amount of copper oxide appears.

[0051] The product of supercritical water oxidation is filtered and vacuum dried to obtain the oxidized powder. The vacuum degree of vacuum drying is below 10 -5 Pa, and the drying temperature and holding time are 80°C and 8h respectively.​Figure 2 c is the SEM image of the oxidized powder, and the contrast Figure 2 As can be seen from a and 2c, the powder after supercritical water oxidation is broken due to the high-temperature and high-pressure environment, the overall morphology changes, and the average particle size slightly decreases.

[0052] The dried supercritical oxidation powder was placed in a tube furnace in a H2 atmosphere for calcination reduction to obtain Cu-Al2O3 composite powder. Specifically, after the tube furnace reached a vacuum environment, argon and hydrogen were introduced, the temperature was increased from room temperature to 500°C at a rate of 10°C / min and kept for 3h, and the program stopped. The powder was cooled to room temperature with the furnace.

[0053] The Cu-Al2O3 composite powder obtained after calcination reduction was placed in a graphite mold with a diameter of 20mm, sealed by wrapping the anvil with graphite paper and pre-pressing by external force, and then placed in a sintering furnace for discharge plasma sintering by a pre-set program. At the same time, a vacuum pump was used to extract the environment in the furnace to vacuum until the end of the sintering process. After the end, it was cooled with the furnace, and after cooling to room temperature, Cu-Al2O3 bulk composite material (Al2O3 mass fraction of 0.6wt%) was obtained. The process parameters of discharge plasma sintering are: sintering pressure is 40MPa, heating rate is 100°C / min, sintering temperature is 900°C, and holding time at sintering temperature is 10min.

[0054] Figure 4 a is the XRD pattern of Cu-Al2O3 composite powder extracted (Cu oxide removed) in Example 3, Figure 5a The element distribution of the sintered sample of Cu-Al2O3 in Example 3 is shown, and it can be seen that the distribution of the reinforcing phase elements in the copper matrix is very uniform, which helps to inhibit the coarsening of copper grains during sintering. The bulk copper-based composite material prepared has excellent performance of high strength, high conductivity and high heat resistance. Specifically, the sintered sample of Example 3 was tested, the density was 99.61%, the hardness was 102.14HV, the electrical conductivity was 88%IACS, the tensile strength, yield strength and plasticity were 290.2MPa, 145.9MPa and 31.7% respectively, and the high-temperature softening temperature was 900°C.

[0055] Example 4

[0056] The difference between Example 4 and Example 3 is that: in Example 4, Cu-0.6wt% Al atomized alloy powder is used as raw material Figure 2 b and d in the middle are the SEM images of Cu-0.6wt% Al atomized alloy powder before and after oxidation in Example 4), and the mass fraction of Al2O3 in the prepared Cu-Al2O3 bulk composite material is 1.12wt%.

[0057] Figure 5bThe element distribution of the Cu-Al2O3 sintered sample in Example 4 is shown, and it can be seen that the distribution of the reinforcing phase elements in the copper matrix is very uniform. Figure 6a The TEM image of the Cu-Al2O3 sintered sample in Example 4 and the particle size statistics of the Al2O3 reinforcing phase therein are shown, and it can be observed that a small amount of Al2O3 particles are gathered at the grain boundaries of the Cu matrix, and most of the fine Al2O3 particles are distributed inside the grain boundaries of the Cu matrix, and the average size of the Al2O3 nanoparticles is about 41.8 nm, and also has very good dispersion and uniformity.

[0058] The sintered sample of Example 4 is tested, and the results are as follows: the density is 99.71%, the hardness is 164.52 HV, the electrical conductivity is 74% IACS, the tensile strength, yield strength and plasticity are 411 MPa, 340.7 MPa and 6.1% respectively, and the high-temperature softening resistance temperature is more than 1000℃. From the comparison between Example 4 and Example 3, it can be seen that with the increase of the content of the Al2O3 reinforcing phase, the supersaturated reinforcing phase elements are precipitated, and the tensile strength and hardness of the material are further improved.

[0059] Example 5

[0060] The difference between Example 5 and Example 3 is that: (1) in Example 5, Cu-3.21wt% Y atomized alloy powder is used as raw material (the average particle size is 70 μm, and the peak particle size is 60 μm and 100 μm respectively), and Cu-4.04wt% Y2O3 bulk composite material is obtained by supercritical oxidation, calcination reduction and spark plasma sintering; (2) in Example 5, the environmental temperature of the supercritical oxidation reaction is 390℃, and the pressure is 27 MPa.

[0061] The sintered sample prepared in Example 5 is tested, and the density is 99.71%, the hardness is 108 HV, the electrical conductivity is 79.1% IACS, the tensile strength, yield strength and plasticity are 326.3 MPa, 276 MPa and 9.5% respectively, and the high-temperature softening resistance temperature is more than 800℃.

[0062] Although the above examples describe that one of Y2O3, aluminum oxide Al2O3 and chromium oxide Cr2O3 is used as a reinforcing phase, as a variation of the above examples, yttrium oxide Y2O3, aluminum oxide Al2O3 and chromium oxide Cr2O3 can also be combined in pairs or three kinds as a reinforcing phase.

[0063] Although the present application is disclosed in specific embodiments as above, it should be understood that the above specific embodiments are not intended to limit the scope of the present application. Any person of ordinary skill in the art can make some improvements without departing from the scope of the present application, and any equivalent improvements made in accordance with the present application should be covered by the protection scope of the present application.

Claims

1. A method for preparing a nano-oxide dispersion-strengthened copper-based composite material, characterized in that: The preparation method comprises the following steps: (1) Supercritical water liquid phase oxidation: Cu-Me atomized alloy powder, H2O and H2O2 are placed in a high temperature and high pressure reactor, and an oxidation reaction is carried out under a supercritical state, followed by filtration and vacuum drying to obtain an oxidized powder; wherein Me is any one or more of Cr, Y and Al; (2) Calcination and reduction: The composite powder after supercritical water oxidation is placed in a tube furnace and calcined and reduced under a reducing atmosphere to obtain Cu-Me x O y Composite powder; (3) Spark plasma sintering: Cu-Me x O y The composite powder is pressed into shape in a graphite mold and then placed in a sintering furnace for spark plasma sintering according to a preset program. At the same time, a vacuum pump is used to evacuate the furnace environment until the sintering process is completed. After the sintering process is completed, the furnace is cooled and the Cu-Me x O y bulk composites; The mass ratio of the Cu-Me atomized alloy powder, water and H2O2 in step (1) is 1:2:

4.

2. The preparation method according to claim 1, characterized in that: The Cu-Me atomized alloy powder is a Cu-Cr atomized alloy powder, wherein the Cr content is 0.8-4.0 wt.%; the ambient temperature of the supercritical water oxidation reaction is 390°C, the holding time is 10 min, and the pressure is 27 MPa.

3. The preparation method according to claim 1, characterized in that: The Cu-Me atomized alloy powder is a Cu-Al atomized alloy powder, wherein the Al content is 0.32-0.6 wt.%; the ambient temperature of the supercritical water oxidation reaction is 380°C, the holding time is 10 min, and the pressure is 25 MPa.

4. The preparation method according to claim 1, characterized in that: The Cu-Me atomized alloy powder is a Cu-Y atomized alloy powder, wherein the Y content is 1-5 wt.%; the ambient temperature of the supercritical water oxidation reaction is 390°C, the holding time is 10 min, and the pressure is 27 MPa.

5. The preparation method according to claim 1, characterized in that: The supercritical water oxidation reaction was stirred at a rate of 400-500 r / min.

6. The preparation method according to claim 1, wherein: In step (1), the vacuum degree of vacuum drying is 10 -5 Pa, the drying temperature and holding time are 60~80 ℃ and 6~8 h respectively.

7. The preparation method according to claim 1, characterized in that: In step (2), after the vacuum environment is reached in the tube furnace, the temperature is increased from room temperature to 500°C at a rate of 5-10°C / min and kept at this temperature for 3 hours. The program is stopped and the powder is cooled to room temperature in the furnace.

8. The preparation method according to claim 1, wherein: In step (iii), the spark plasma sintering pressure is 30-40 MPa, the heating rate is 90-100 °C / min, the sintering temperature is 800-900 °C, and the sintering temperature is kept at the sintering temperature for 10 min and then cooled to room temperature with the furnace.

9. A nano-oxide dispersion-strengthened copper-based composite material, characterized in that Obtained according to the preparation method according to any one of claims 1 to 8.

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