阅读说明：本技术 一种聚变堆用纳米氧化物弥散强化铜合金的制备方法 (Preparation method of nano-oxide dispersion strengthened copper alloy for fusion reactor ) 是由 赵四祥 张廷晓 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种聚变堆用纳米氧化物弥散强化铜合金的制备方法,包括以下步骤：(1)、以电解铜、纯铝、纯钛或铜钛中间合金为原料,采用真空气雾化得到合金粉末；(2)、利用机械合金化方法制备氧源；(3)、将合金粉末和氧源均匀混合,得到混合粉末；(4)、对混合粉末进行高温内氧化处理,然后进行氢气还原处理；(5)、将还原后的粉末利用冷等静压压成所需形状的生坯；(6)、将得到的生坯再次氢气还原；(7)、将二次还原后的生坯进行真空高温脱气处理；(8)、高温固结处理。本发明解决了现有技术得到的氧化物尺寸、形貌、空间分布的问题、高温强度和蠕变性能不足的问题以及硼添加导致吸收中子的问题。(The invention discloses a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which comprises the following steps: (1) taking electrolytic copper, pure aluminum, pure titanium or copper-titanium intermediate alloy as raw materials, and obtaining alloy powder by adopting vacuum gas atomization; (2) preparing an oxygen source by using a mechanical alloying method; (3) uniformly mixing the alloy powder and an oxygen source to obtain mixed powder; (4) carrying out high-temperature internal oxidation treatment on the mixed powder, and then carrying out hydrogen reduction treatment; (5) pressing the reduced powder into a green body with a required shape by cold isostatic pressing; (6) reducing the obtained green body by hydrogen again; (7) carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction; (8) and high-temperature consolidation treatment. The invention solves the problems of size, shape and spatial distribution of the oxide, insufficient high-temperature strength and creep property and neutron absorption caused by boron addition in the prior art.)

1. A preparation method of a nano oxide dispersion strengthened copper alloy for a fusion reactor is characterized by comprising the following steps:

step (1), melting and atomizing by using electrolytic copper, pure aluminum, pure titanium or copper-titanium intermediate alloy as a raw material by using vacuum gas atomization powder preparation equipment to prepare powder, and sieving to obtain alloy powder;

step (2), cuprous oxide, nano aluminum oxide and nano titanium oxide are mixed according to the proportion and are mechanically alloyed to obtain an oxygen source, and the proportion of the copper, the aluminum and the titanium is consistent with that of the step (1);

step (3), uniformly mixing the alloy powder obtained in the step (1) and the oxygen source obtained in the step (2) according to a ratio, and fully drying the mixture to obtain mixed powder;

step (4), carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (3), fully crushing the powder after internal oxidation and sieving;

step (5), carrying out hydrogen reduction treatment on the powder obtained in the step (4), wherein the reduction temperature is 350-600 ℃, and the heat preservation time of each boat of powder is not less than 2 hours;

step (6), pressing the powder reduced in the step (5) into a green body with a required shape by cold isostatic pressing;

step (7), carrying out hydrogen reduction on the green body obtained in the step (6) again in a temperature range of 850-950 ℃, wherein the reduction can be carried out in a hydrogen furnace or a closed sheath filled with hydrogen for 2-10 hours;

and (8) carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction, carrying out high-temperature consolidation treatment on the degassed green body to improve the density, and carrying out cold-hot plastic processing on the material according to use requirements after the consolidation treatment.

2. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: before powder making in the step (1), the equipment is vacuumized to be below 100Pa, then high-purity argon is injected, an alumina or magnesia crucible is adopted for smelting, and after smelting, the mass percentage of aluminum in the alloy is ensured to be 0.1-0.4%, and the mass ratio of titanium to aluminum is 1: 1-1: 2.

3. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: and (4) performing in a negative pressure closed container or under the condition of full protection of inert gas.

4. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: the internal oxidation temperature in the step (4) is 900-950 ℃, and the time is 1-4 hours.

5. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: the granularity of the alloy powder in the step (1) is less than 325 meshes.

6. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: and (4) in the step (6), the cold isostatic pressure is 200-300 MPa.

7. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: and (3) degassing at the temperature of 450-900 ℃ for 4-10 hours in the step (8).

8. A method of preparing a nano-oxide dispersion strengthened copper alloy for a fusion reactor according to claim 1, wherein the method comprises the following steps: the consolidation method in the step (8) is hot extrusion or hot isostatic pressing.

Technical Field

The invention belongs to the technical field of copper alloy preparation, and particularly relates to a preparation method of a nano oxide dispersion strengthened copper alloy for a fusion reactor.

Background

In the future, the divertor component of the fusion reactor is in a severe service environment with synergistic effects of extremely high heat load, high-dose neutron irradiation, plasma irradiation, hydrogen isotopes, high-temperature stress and the like, so that the heat sink material is required to have the characteristics of high strength, high toughness, high thermal conductivity, high heat resistance, radiation damage resistance, low hydrogen isotope retention and the like. Combining the above requirements and material availability, etc., copper-based materials are the choice of compromise, and oxide dispersion strengthening is the most promising heat sink copper material strengthening strategy capable of simultaneously balancing the above requirements. In order to meet the performance of the material, the oxide dispersion strengthened copper is required to have the following characteristics on the microstructure: (1) the number density of oxide particles is as high as possible (up to or exceeding 10)²²/m³) (ii) a (2) The size of the intragranular oxide is as small as possible (within 10 nm); (3) the shape of the oxide is as spherical as possible; (4) the free oxygen content is as low as possible (within 30 ppm); (5) the oxide is uniformly distributed in the copper matrix, and oxide-poor copper grains are not present.

However, for the application scenario of the heat sink material of the divertor of the fusion reactor, the commercial aluminum oxide dispersion strengthened copper has the following defects in terms of microstructure and performance: (1) the oxide has large scale distribution range, easy segregation, irregular shape and uneven spatial distribution; (2) low high-temperature strength and poor creep property; (3) the neutron absorber boron is added in the application scene of low free oxygen, the requirement of a heat sink material of a divertor component of a future fusion reactor cannot be completely met, and the performance needs to be further improved.

Disclosure of Invention

The invention aims to provide a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which aims to solve the technical problem.

The invention provides the following technical scheme: a preparation method of a nano oxide dispersion strengthened copper alloy for a fusion reactor comprises the following steps:

step (1), melting and atomizing by using electrolytic copper, pure aluminum, pure titanium or copper-titanium intermediate alloy as a raw material by using vacuum gas atomization powder preparation equipment to prepare powder, and sieving to obtain alloy powder;

step (2), cuprous oxide, nano aluminum oxide and nano titanium oxide are mixed according to the proportion and are mechanically alloyed to obtain an oxygen source, and the proportion of the copper, the aluminum and the titanium is consistent with that of the step (1);

step (3), uniformly mixing the alloy powder obtained in the step (1) and the oxygen source obtained in the step (2) according to a ratio, and fully drying the mixture to obtain mixed powder;

step (4), carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (3), fully crushing the powder after internal oxidation and sieving;

step (5), carrying out hydrogen reduction treatment on the powder obtained in the step (4), wherein the reduction temperature is 350-600 ℃, and the heat preservation time of each boat of powder is not less than 2 hours;

step (6), pressing the powder reduced in the step (5) into a green body with a required shape by cold isostatic pressing;

step (7), carrying out hydrogen reduction on the green body obtained in the step (6) again in a temperature range of 850-950 ℃, wherein the reduction can be carried out in a hydrogen furnace or a closed sheath filled with hydrogen for 2-10 hours;

and (8) carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction, carrying out high-temperature consolidation treatment on the degassed green body to improve the density, and carrying out cold-hot plastic processing on the material according to use requirements after the consolidation treatment.

As a further description of the above scheme:

before powder making in the step (1), the equipment is vacuumized to be below 100Pa, then high-purity argon is injected, an alumina or magnesia crucible is adopted for smelting, and after smelting, the mass percentage of aluminum in the alloy is ensured to be 0.1-0.4%, and the mass ratio of titanium to aluminum is 1: 1-1: 2.

As a further description of the above scheme:

and (4) performing in a negative pressure closed container or under the condition of full protection of inert gas.

As a further description of the above scheme:

the internal oxidation temperature in the step (4) is 900-950 ℃, and the time is 1-4 hours.

As a further description of the above scheme:

the granularity of the alloy powder in the step (1) is less than 325 meshes.

As a further description of the above scheme:

and (4) in the step (6), the cold isostatic pressure is 200-300 MPa.

As a further description of the above scheme:

and (3) degassing at the temperature of 450-900 ℃ for 4-10 hours in the step (8).

As a further description of the above scheme:

the consolidation method in the step (8) is hot extrusion or hot isostatic pressing.

The beneficial effects of the invention are as follows:

the preparation method of the nano-oxide dispersion strengthened copper alloy for the fusion reactor provided by the invention solves the problems of size, appearance and spatial distribution of the oxide, insufficient high-temperature strength and creep property and neutron absorption caused by boron addition in the prior art;

the preparation method of the invention has the technical improvement measures that: (1) atomizing by vacuum inert gas instead of water atomization to prepare powder; (2) doping a certain amount of titanium element in a powder making and smelting link; (3) preparing an oxygen source with uniformly distributed titanium-aluminum composite oxide by adopting a mechanical alloying method; (4) two-step hydrogen reduction is adopted to replace boron addition; according to the invention, titanium element is doped in the gas atomization powder preparation link, and the oxygen source with uniformly distributed oxide ceramic phase is prepared by mechanical alloying, so that the ball milling of copper alloy powder is avoided, and the risk of introducing a large amount of impurities is reduced.

Based on the preparation method, oxide particles in the crystal grains are obviously refined and spheroidized, the formation of triangular, rod-shaped and other oxides is avoided, the number density of the oxides is obviously improved under the condition of equal volume fraction of the reinforcing phase, and the growth and agglomeration of the oxides at the crystal boundary are well inhibited; under the same state (enhanced phase volume fraction and plastic processing history), the strength, the plasticity, the electric conduction/thermal performance of the material are comprehensively improved; in addition, because the generation of poor oxide copper crystal grains is avoided, the high-temperature strength and the creep resistance of the material are obviously improved; under the constraint condition of low free oxygen, the neutron irradiation resistance of the material is obviously improved due to the avoidance of the addition of boron.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a composite oxide dispersion strengthened copper microstructure prepared by the method of example 1;

FIG. 2 shows the microstructure of an aluminum oxide dispersion-strengthened copper prepared by the method of the comparative example.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. The structural features of the present invention will now be described in detail with reference to the accompanying drawings.

Example 1

The embodiment provides a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which comprises the following steps:

step (1), smelting by using electrolytic copper, pure aluminum and copper-titanium intermediate alloy as raw materials by using vacuum gas atomization powder preparation equipment and atomizing by using argon gas to prepare powder to obtain alloy powder; before powder preparation, vacuumizing the equipment to below 100Pa, then injecting high-purity argon, smelting by using a magnesium oxide crucible, and ensuring that the mass percentage of aluminum in the alloy is 0.18% and the mass ratio of titanium to aluminum is 1: 2;

sieving the obtained powder to obtain alloy powder with the granularity smaller than 325 meshes;

step (3), mixing cuprous oxide, nano aluminum oxide and nano titanium oxide in proportion (the proportion of the three elements of copper, aluminum and titanium is consistent with that in step (1)), mechanically alloying in a ball mill for 12 hours, and performing argon protection in the whole ball milling process to obtain an oxygen source with uniform components;

step (4), uniformly mixing the alloy powder obtained in the step (2) and the oxygen source obtained in the step (3) according to a proportion by using a powder mixer (the required oxygen supply amount is 1.4 times of a theoretical value), and fully drying the mixture to obtain mixed powder;

step (5), under the condition of full protection of nitrogen, carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (4), wherein the internal oxidation temperature is 920 ℃, and the time is 2 hours;

fully crushing the internally oxidized powder by using a crusher and sieving the powder by using a sieve finer than 100 meshes;

step (7), carrying out hydrogen reduction treatment on the powder obtained in the step (6), wherein the reduction temperature is 500 ℃, and the heat preservation time of each boat of powder is 2 hours;

step (8), pressing the powder reduced in the step (7) into a bar blank by using cold isostatic pressing, wherein the cold isostatic pressing pressure is 200 MPa;

step (9), carrying out hydrogen reduction on the green compact obtained in the step (8) again at 850 ℃, wherein the reduction is carried out in a hydrogen furnace for 2 hours;

sealing and welding the green body subjected to secondary reduction in a sheath by using an oxidation-free method, and then performing vacuum high-temperature degassing treatment at the degassing temperature of 450 ℃ for 4 hours;

and (11) in order to improve the compactness, carrying out hot extrusion treatment on the degassed green body at 900 ℃, wherein the hot extrusion deformation is 90%, obtaining a bar in a hot processing state, and obtaining a sample shown in figure 1, wherein the properties of the sample are shown in table 1.

Example 2

The embodiment provides a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which comprises the following steps:

step (1), taking electrolytic copper, pure aluminum and pure titanium as raw materials, smelting by adopting vacuum gas atomization powder making equipment, and atomizing by using argon to make powder to obtain alloy powder; before powder making, firstly, vacuumizing the equipment to be below 100Pa, then, introducing high-purity argon, smelting by adopting an alumina crucible, and ensuring that the mass percentage of aluminum in the alloy is 0.35% and the mass ratio of titanium to aluminum is 1:1 after smelting;

sieving the obtained powder to obtain alloy powder with the granularity smaller than 325 meshes;

step (3), mixing cuprous oxide, nano aluminum oxide and nano titanium oxide in proportion (the proportion of the three elements of copper, aluminum and titanium is consistent with that in step (1)), mechanically alloying in a ball mill for 13 hours, and performing argon protection in the whole ball milling process to obtain an oxygen source with uniform components;

step (4), uniformly mixing the alloy powder obtained in the step (2) and the oxygen source obtained in the step (3) according to a proportion by using a powder mixer (the required oxygen supply amount is 1.3 times of a theoretical value), and fully drying the mixture to obtain mixed powder;

step (5), under the condition of full protection of high-purity argon, carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (4), wherein the internal oxidation temperature is 900 ℃, and the time is 3 hours;

fully crushing the internally oxidized powder by using a crusher and sieving the powder by using a sieve finer than 100 meshes;

step (7), carrying out hydrogen reduction treatment on the powder obtained in the step (6), wherein the reduction temperature is 450 ℃, and the heat preservation time of each boat of powder is not less than 2 hours;

step (8), pressing the powder reduced in the step (7) into a tubular green body by using cold isostatic pressing, wherein the cold isostatic pressing pressure is 250 MPa;

step (9), reducing the green compact obtained in the step (8) by hydrogen again at 900 ℃, wherein the reduction is carried out in a closed sheath filled with hydrogen, and the reduction time is 6 hours;

step (10), carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction at the degassing temperature of 600 ℃ for 6 hours;

step (11), in order to improve the density, hot extrusion is carried out on the degassed green body, and the hot extrusion temperature is 880 ℃, so that a pipe blank is obtained;

and (12) cold rolling the pipe blank, wherein the cold deformation is 74%, and the performance is shown in Table 1.

Example 3

The embodiment provides a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which comprises the following steps:

step (1), smelting by using electrolytic copper, pure aluminum and copper-titanium intermediate alloy as raw materials by using vacuum gas atomization powder preparation equipment and atomizing by using argon gas to prepare powder to obtain alloy powder; before powder preparation, vacuumizing the equipment to below 100Pa, then introducing high-purity argon, smelting by using a magnesium oxide crucible, and ensuring that the mass percent of aluminum in the alloy is 0.1% and the mass ratio of titanium to aluminum is 1:1.5 after smelting;

sieving the obtained powder to obtain alloy powder with the granularity smaller than 325 meshes;

step (3), mixing cuprous oxide, nano aluminum oxide and nano titanium oxide in proportion (the proportion of the three elements of copper, aluminum and titanium is consistent with that in step (1)), mechanically alloying in a ball mill for 14 hours, and performing argon protection in the whole ball milling process to obtain an oxygen source with uniform components;

step (4), uniformly mixing the alloy powder obtained in the step (2) and the oxygen source obtained in the step (3) according to a proportion by using a powder mixer (oxygen supply amount is 1.5 times of a theoretical value), and fully drying the mixture to obtain mixed powder;

step (5), in a negative pressure closed container, carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (4), wherein the internal oxidation temperature is 950 ℃, and the time is 3 hours;

fully crushing the internally oxidized powder by using a crusher and sieving the powder by using a sieve finer than 100 meshes;

step (7), carrying out hydrogen reduction treatment on the powder obtained in the step (6), wherein the reduction temperature is 500 ℃, and the heat preservation time of each boat of powder is not less than 2 hours;

step (8), pressing the powder reduced in the step (7) into a plate-shaped green body by using cold isostatic pressing, wherein the cold isostatic pressing pressure is 280 MPa;

step (9), carrying out hydrogen reduction on the green body obtained in the step (8) again in a temperature zone of 900 ℃, and carrying out reduction in a closed sheath filled with hydrogen for 8 hours;

step (10), carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction at the degassing temperature of 700 ℃ for 8 hours;

step (11), performing high-temperature densification treatment on the degassed green body by using hot isostatic pressing, wherein the hot isostatic pressing temperature is 900 ℃, and the pressure is 120 MPa;

and (12) cold rolling the plate subjected to hot isostatic pressing treatment, wherein the cold deformation is 60%, and the properties of the obtained sample are shown in Table 1.

Example 4

The embodiment provides a preparation method of a nano-oxide dispersion strengthened copper alloy for a fusion reactor, which comprises the following steps:

step (1), smelting by using electrolytic copper, pure aluminum and copper-titanium intermediate alloy as raw materials by using vacuum gas atomization powder preparation equipment and atomizing by using argon gas to prepare powder to obtain alloy powder; before powder making, firstly, vacuumizing the equipment to be below 100Pa, then, introducing high-purity argon, smelting by adopting an alumina crucible, and ensuring that the mass percent of aluminum in the alloy is 0.4% and the mass ratio of titanium to aluminum is 1:2 after smelting;

sieving the obtained powder to obtain alloy powder with the granularity smaller than 325 meshes;

step (3), mixing cuprous oxide, nano aluminum oxide and nano titanium oxide in proportion (the proportion of the three elements of copper, aluminum and titanium is consistent with that in step (1)), mechanically alloying in a ball mill for 15 hours, and performing argon protection in the whole ball milling process to obtain an oxygen source with uniform components;

step (4), uniformly mixing the alloy powder obtained in the step (2) and the oxygen source obtained in the step (3) according to a proportion by using a powder mixer (oxygen supply amount is 1.4 times of a theoretical value), and fully drying the mixture to obtain mixed powder;

step (5), under the condition of full protection of high-purity argon gas, carrying out high-temperature internal oxidation treatment on the mixed powder obtained in the step (4), wherein the internal oxidation temperature is 950 ℃, and the time is 4 hours;

fully crushing the internally oxidized powder by using a crusher and sieving the powder by using a sieve finer than 100 meshes;

step (7), carrying out hydrogen reduction treatment on the powder obtained in the step (6), wherein the reduction temperature is 600 ℃, and the heat preservation time of each boat of powder is 5 hours;

step (8), pressing the powder reduced in the step (7) into a rod-shaped green body by using cold isostatic pressing, wherein the cold isostatic pressing pressure is 300 MPa;

step (9), carrying out hydrogen reduction on the green body obtained in the step (8) at 950 ℃, wherein the reduction is carried out in a closed sheath filled with hydrogen for 10 hours;

step (10), carrying out vacuum high-temperature degassing treatment on the green body subjected to secondary reduction at the degassing temperature of 900 ℃ for 10 hours;

step (11), carrying out hot isostatic pressing treatment on the degassed green body, wherein the hot isostatic pressing temperature is 900 ℃, the pressure is 140MPa, and the time is 3 hours; the properties of the obtained samples are shown in Table 1.

Comparative example

The embodiment also provides the following comparative example, and the preparation method of the aluminum oxide dispersion strengthened copper in the prior art is adopted, and the method specifically comprises the following steps:

smelting in a graphite crucible to prepare copper-aluminum alloy, wherein the content of aluminum is 0.25%, preparing alloy powder by using a water atomization method, and screening out powder with the particle size smaller than 325 meshes;

step (2), uniformly mixing the atomized and screened Cu-Al alloy powder with cuprous oxide by using a powder mixer (wherein the oxygen supply amount is 1.4 times of the theoretical value), and fully drying the mixed powder;

step (3), carrying out high-temperature internal oxidation treatment under the nitrogen protection condition, wherein the internal oxidation temperature is 920 ℃, and the time is 2 hours;

fully crushing the internally oxidized powder by using a crusher and sieving the powder by using a sieve finer than 100 meshes;

step (5), carrying out hydrogen reduction treatment on the powder obtained in the step (4), wherein the reduction temperature is 500 ℃, and the heat preservation time of each boat of powder is 2 hours;

step (6), uniformly mixing the powder after reduction treatment with boron powder, wherein the boron content is 0.03 percent of the total mass of the powder;

step (7), pressing the powder reduced in the step (6) into a bar blank by using cold isostatic pressing, wherein the cold isostatic pressing pressure is 200 MPa;

step (8), sealing and welding the rod-shaped green body in a sheath, and then carrying out vacuum high-temperature degassing treatment, wherein the degassing temperature is 450 ℃ and the degassing time is 4 hours;

step (9), carrying out hot extrusion treatment on the degassed green body at 900 ℃ to obtain a bar in a hot processing state; the resulting sample is shown in FIG. 2, and its properties are shown in Table 1.

TABLE 1 comparison of sample Properties

According to table 1, the volume fractions of oxides in example 1 and comparative example are equivalent, and both materials are hot-extruded, but the material obtained by implementing example 1 is all superior to the comparative example in 4 indexes of electrical conductivity, yield strength, tensile strength and elongation. The volume fraction of the oxide in example 3 corresponds to commercial AL-15, and examples 2 and 4 correspond to commercial AL-60, and it can be seen that the materials obtained in examples 2, 3 and 4 have better overall properties than the commercial materials in the same state by comparing the test data in the same plastic working state. The materials obtained in example 1 and comparative example were fully polished and annealed at 900 ℃ in a hydrogen atmosphere, and no hydrogen expansion was observed when measured by a micrometer screw, indicating that the secondary hydrogen reduction had the same effect as boron doping. When the hardness at high temperature is measured, the hardness of the comparative example material is reduced rapidly with the temperature rise at the temperature of more than 250 ℃, and the reduction amplitude of the material in the example 1 is far lower than that of the comparative example, so that the good high-temperature strength of the material in the example is proved. Fig. 1 and 2 show the effective control of the microscopic features of the present invention, such as oxide size, morphology, number density, spatial distribution, etc. In conclusion, the present invention shows advantageous effects over conventional methods.

The defects of the aluminum oxide dispersion strengthened copper prepared by the prior art are closely related to the intrinsic factors of the preparation route and the material system, and the reasons for forming the oxide state are mainly as follows: (1) alumina on the surface of the powder is preferentially formed and grows up in the water atomization powder preparation link; (2) in the process of internal oxidation, the in-crystal alumina preferentially grows along the direction of low mismatching of a phase interface; (3) oxide at the crystal boundary is subjected to segregation and growth in the internal oxidation process. The reasons for the insufficient high temperature strength and creep properties are: (4) the added oxidant (cuprous oxide) eventually diffracts into copper particles that are alumina-free inside, creating an oxidation-free zone. The reason why boron is added is: (5) the boron element is used as a solid reducing agent, and free oxygen reacts with boron during high-temperature solidification. The method has no problem when being applied to the fields of resistance welding and the like, but cannot be applied to the field of fusion. The preparation method of the nano-oxide dispersion strengthened copper alloy for the fusion reactor, provided by the embodiment of the invention, solves the problems of size, morphology and spatial distribution of the oxide, insufficient high-temperature strength and creep property and neutron absorption caused by boron addition in the prior art.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.