High-temperature-resistant alloy powder for additive manufacturing and preparation method of high-temperature-resistant alloy powder

Abstract

The invention relates to the technical field of alloys, in particular to high-temperature-resistant alloy powder for additive manufacturing and a preparation method of the high-temperature-resistant alloy powder. The method comprises the following steps: dissolving lanthanum chloride in a first solvent, then adding graphene oxide, carrying out ultrasonic dispersion, then adding an ammonia water solution, carrying out a reaction, carrying out centrifugal separation, washing and drying after the reaction, carrying out a heat preservation reaction, and cooling to obtain a lanthanum oxide-graphene compound; dispersing the lanthanum oxide-graphene compound in a second solvent, adding 3-vinylphenylboronic acid to obtain a mixed solution, then placing the mixed solution in a 60Co radioactive source for irradiation, and after irradiation, washing, filtering and drying to obtain a lanthanum oxide-boron-containing graphene compound; under the protective atmosphere, magnesium powder, aluminum powder and zinc powder are subjected to primary ball milling, then the lanthanum oxide-boron-containing graphene compound is added for secondary ball milling, and alloy powder is obtained; and carrying out heat treatment on the alloy powder to obtain the high-temperature-resistant alloy. The alloy provided by the invention has excellent high temperature resistance, corrosion resistance and wear resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of alloys, and in particular relates to a high temperature resistant alloy powder for additive manufacturing and a preparation method thereof. Background Art

[0002] AZ61 magnesium alloy is a deformable magnesium alloy with magnesium as the matrix, aluminum and zinc as the main alloying elements, and contains a small amount of manganese to improve corrosion resistance. The alloy has high specific strength and specific stiffness, good thermal conductivity, electrical conductivity, damping and shock absorption, and processing and forming properties. It is widely used in automotive, electronic communications, aerospace and other fields, such as clutch housings, gearbox bodies, steering wheel brackets and other lightweight components. However, although AZ61 performs well at room temperature, it still has significant defects in high temperature resistance, corrosion resistance and wear resistance. The limitations of AZ61 mainly come from its alloy composition and phase structure. When the temperature exceeds 120°C, The phase will gradually dissolve in the α-Mg matrix, resulting in a sharp drop in material strength. In a medium (such as NaCl solution), the α-Mg matrix and Galvanic corrosion forms between the phases, the matrix dissolves preferentially as the anode, and the β phase acts as the cathode to accelerate the local corrosion process. The corrosion rate of cast AZ61 can reach 2.86×10⁻ 4 g / (h·cm²), and the corrosion morphology is mainly pitting corrosion that expands into surface corrosion. Although adding rare earth elements (such as Nd) or transition metals (such as Ca) can refine the grains and improve the distribution of β phase, excessive addition will form new phases such as Al-Nd or Al-Ca, aggravating galvanic corrosion. In addition, AZ61 is prone to oxidative wear under dry friction conditions, and the MgO film formed on the surface is brittle and easy to break and peel off, making it difficult to form a continuous protective layer, further aggravating material loss.

[0003] In general, the lightweight advantage of AZ61 magnesium alloy makes it occupy an important position in the field of structural materials, but its high temperature resistance is limited by the thermal instability of the β phase and the intrinsic characteristics of the HCP structure. Its corrosion resistance is difficult to meet the requirements of harsh environments due to galvanic corrosion and oxide film defects. Its wear resistance is highly dependent on the heat treatment process and is easily affected by microstructure coarsening.

[0004] For example, CN118417556A discloses a graphene-enhanced nickel-based alloy material and a preparation method thereof, and a graphene-enhanced nickel-based alloy strengthening layer, the method comprising: first mixing and first ultrasonically treating graphene powder, a modifier, and a dispersant to obtain a graphene mixed solution; second mixing and second ultrasonically treating the graphene mixed solution and nickel-based alloy powder, followed by filtering and grinding to obtain a graphene nickel-based alloy mixed powder; and heat-treating the graphene nickel-based alloy mixed powder to obtain a graphene-enhanced nickel-based alloy material. Although the graphene-enhanced nickel-based alloy material obtained in this application can solve the problem of insufficient hardness and corrosion resistance of the alloy under high temperature and corrosive environment, the modifier may generate a brittle phase (such as carbide) at the interface during heat treatment, which becomes a crack source, resulting in a reduction in the strength and other properties of the alloy.

[0005] For example, CN102251162A discloses a method for preparing a high-performance nano-lanthanum oxide doped molybdenum-silicon-boron alloy, using molybdenum powder, silicon powder and boron powder as raw materials, doping with nano-lanthanum oxide powder of different contents, ball milling and mixing evenly, pre-pressing and pre-sintering, smelting the obtained sintered body in a vacuum arc furnace, the smelting working current is 800-1000A, crushing the obtained alloy ingot and ball milling powder, sieving the alloy powder with a 200-300 mesh Taylor sieve, sintering the obtained alloy powder in a vacuum hot pressing sintering furnace, temperature: 1500-1700℃, pressure: 30-50MPa, time: 1-3 hours, and cooling to room temperature with the furnace after sintering. The nano-lanthanum oxide doped molybdenum-silicon-boron alloy obtained in this application has the characteristics of uniform organization, high density and high strength, but when this application adopts the solid-solid doping method (direct mixing of molybdenum powder and nano-lanthanum oxide), nanoparticles are prone to agglomeration, resulting in uneven distribution of rare earth phases, which in turn leads to a decrease in the performance of the alloy.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a high-temperature resistant alloy powder for additive manufacturing and a preparation method thereof. The alloy provided by the present invention has excellent high-temperature resistance, corrosion resistance and wear resistance.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, an embodiment of the present invention provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), dissolving lanthanum chloride in a first solvent, then adding graphene oxide, and adding an ammonia solution after ultrasonic dispersion to carry out a primary reaction. After the reaction is completed, the solid phase is separated by centrifugation, washed, dried, and subjected to a heat-insulating reaction, and then cooled, ground, and sieved to obtain a lanthanum oxide-graphene composite; Step (2), dispersing the lanthanum oxide-graphene composite in a second solvent, uniformly dispersing by ultrasonication, then adding 3-vinylbenzeneboric acid to obtain a mixed solution, then placing the mixed solution in a 60Co radiation source for irradiation, and washing, filtering, drying, grinding and sieving after the irradiation to obtain the lanthanum oxide-boron-containing graphene composite.

[0009] Step (3), in a protective atmosphere, ball-milling the magnesium powder, aluminum powder and zinc powder, and then adding the lanthanum oxide-boron-containing graphene composite for secondary ball-milling to obtain an alloy powder; Step (4), heat treating the alloy powder to obtain a high temperature resistant alloy.

[0010] The present invention improves the dispersibility of lanthanum oxide in the alloy by compounding lanthanum oxide and graphene oxide, thereby improving the high temperature resistance, corrosion resistance, wear resistance and other properties of the alloy powder.

[0011] In addition, the present invention simultaneously performs boron modification on graphene oxide, and boron, graphene oxide and lanthanum oxide in the alloy matrix synergistically improve the high temperature resistance, corrosion resistance, wear resistance and other properties of the alloy powder.

[0012] Specifically, in terms of compatibility, the nanoparticles of lanthanum oxide form chemical bonds with the oxygen-containing functional groups (such as carboxyl and epoxy groups) of graphene oxide (GO) through surface hydroxyl groups to form a stable composite structure. This composite is evenly dispersed in the magnesium, aluminum, and zinc matrix during the subsequent ball milling process. Its interfacial bonding force is enhanced by the two-dimensional sheet structure of GO, which effectively inhibits the agglomeration of metal particles. In addition, the boron atoms produced by the decomposition of 3-vinylbenzeneboronic acid after irradiation are combined with the defect sites on the surface of GO through chemical bonding to form a boron-doped graphene network. This network not only acts as a bridge to connect lanthanum oxide and the metal matrix, but also reduces the interfacial energy difference and promotes the compatibility of heterogeneous interfaces through the hybridization of the p orbital of the boron atom and the d orbital of the metal. At the same time, the nano-size effect of lanthanum oxide makes it easier to embed into the metal lattice gap, alleviating the microscopic stress concentration caused by the difference in thermal expansion coefficient.

[0013] In terms of high temperature resistance, first of all, lanthanum oxide still maintains thermodynamic stability at high temperatures, and its nanoparticles inhibit grain coarsening by pinning grain boundaries, thereby increasing the recrystallization temperature of the alloy. The two-dimensional structure of GO forms a continuous three-dimensional thermal conductive network at high temperatures, accelerating heat diffusion and reducing local thermal stress; its high modulus properties can also hinder dislocation slip and improve high-temperature creep resistance. The introduction of boron elements works in two ways: on the one hand, boron atoms react with aluminum and magnesium during heat treatment to generate , Borides such as GO and GO are the high melting point phases that hinder high temperature deformation as dispersion strengthening phases. On the other hand, boron-containing graphene formed by the composite of boron and GO is preferentially generated in a high temperature oxidizing environment. Glassy film, which has self-healing properties and can Together they form a double-layer anti-oxidation barrier. Experiments show that the oxygen diffusion coefficient of this composite oxide film is higher than that of a single The film is 2-3 orders of magnitude lower, which significantly delays the high-temperature oxidation process.

[0014] Finally, in terms of corrosion resistance, the ternary synergistic effect of lanthanum oxide-graphene-boron is manifested as a coupling effect of physical barrier and electrochemical protection. The GO layer structure forms a dense physical isolation layer on the alloy surface, and its theoretical permeation path tortuosity can reach 10 4 Lanthanum oxide promotes the formation of a rich Passivation film (such as La doped ), the film has a lower oxygen vacancy concentration and a higher breakdown potential (can be increased by about 0.3V). The addition of boron further optimizes the chemical stability of the passivation film: In corrosive environments, boron atoms preferentially react with Combined to form soluble , consuming local corrosive media; at the same time, the high bond energy of BO bond (about 809kJ / mol) enhances the structural integrity of the passivation film. The three synergistically form a multi-level protection system of "physical barrier-chemical passivation-medium consumption", which reduces the corrosion rate of the alloy in the salt spray test to less than 1 / 5 of that of traditional magnesium alloys.

[0015] In a preferred embodiment, in step (1), the first solvent is deionized water.

[0016] In a preferred embodiment, in step (1), the usage ratio of the lanthanum chloride, the first solvent and the graphene oxide is (5-10 g): (100-200 ml): 1 g.

[0017] In a preferred embodiment, in step (1), the ultrasonication time is 30-60 min.

[0018] In a preferred embodiment, in step (1), the volume ratio of the aqueous ammonia solution to the first solvent is (0.2-0.5): (0.5-1).

[0019] In a preferred embodiment, in step (1), the primary reaction conditions are: reaction temperature 50-100° C., reaction time 0.5-2 h.

[0020] In a preferred embodiment, in step (1), the heat preservation reaction conditions are: heat preservation at 500-800° C. for 1-5 h under nitrogen protection.

[0021] In a preferred embodiment, in step (2), the second solvent is a mixture of water and ethanol, and the volume ratio of water to ethanol is 1:(1-2).

[0022] In a preferred embodiment, in step (2), the usage ratio of the lanthanum oxide-graphene composite, the second solvent and 3-vinylbenzene boronic acid is 1 g: (100-200 ml): (10-50 g).

[0023] In a preferred embodiment, in step (2), the absorbed dose of the irradiation is 1-500 kGy.

[0024] In a preferred embodiment, in step (2), the sieve used for screening is 200-400 mesh.

[0025] In a preferred embodiment, in step (3), the protective atmosphere is nitrogen or argon.

[0026] In a preferred embodiment, in step (3), the mass ratio of the magnesium powder, aluminum powder, zinc powder, and lanthanum oxide-boron-containing graphene composite is 100: (10-20): (1-10): (5-10).

[0027] In a preferred embodiment, in step (3), the conditions of the first ball milling are: ball milling at 300-500 r / min for 1-3 h.

[0028] In a preferred embodiment, in step (3), the conditions for the secondary ball milling are: ball milling at 300-500 r / min for 2-5 h.

[0029] In a preferred embodiment, in step (4), the heat treatment conditions are: in a nitrogen atmosphere, heating to 600-800°C at 5-10°C / min and keeping warm for 30-60 min, cooling to 400-600°C and keeping warm for 4-8 h, cooling to room temperature and then heating to 200-300°C at 5-10°C / min and keeping warm for 2-6 h.

[0030] In a second aspect, an embodiment of the present invention provides a high temperature resistant alloy obtained by the preparation method of the high temperature resistant alloy as described above.

[0031] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. The present invention improves the dispersibility of lanthanum oxide in the alloy by compounding lanthanum oxide and graphene oxide, thereby improving the high temperature resistance, corrosion resistance, wear resistance and other properties of the alloy powder.

[0032] 2. The present invention simultaneously performs boron modification on graphene oxide, and boron, graphene oxide and lanthanum oxide in the alloy matrix synergistically improve the high temperature resistance, corrosion resistance, wear resistance and other properties of the alloy powder. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available. Example 1

[0035] This embodiment provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), dissolving 6 g of lanthanum chloride in 150 ml of deionized water, then adding 1 g of graphene oxide, ultrasonically dispersing for 40 min, adding 50 ml of ammonia solution (28-32%), heating to 65° C., reacting for 1 h, centrifuging and separating the solid phase after the reaction, washing and drying, and keeping the temperature at 650° C. for 2 h under nitrogen protection, cooling, grinding and passing through a 300-mesh sieve to obtain a lanthanum oxide-graphene composite; Step (2), dispersing 4g of lanthanum oxide-graphene composite in a mixed liquid of 200ml of deionized water and 200ml of ethanol, ultrasonically dispersing for 30min, then adding 50g of 3-vinylbenzeneboric acid to obtain a mixed liquid, then placing the mixed liquid in a 60Co radiation source for irradiation, the absorbed dose of irradiation is 200kGy, after the irradiation is completed, washing, filtering, drying, grinding and passing through a 300-mesh sieve to obtain a lanthanum oxide-boron-containing graphene composite.

[0036] Step (3), under nitrogen protection, 100 g of magnesium powder, 12.4 g of aluminum powder and 6.7 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h, then 6.7 g of lanthanum oxide-boron-containing graphene composite was added and ball-milled at 400 r / min for 3 h to obtain alloy powder; Step (4), under a nitrogen atmosphere, heating the alloy powder to 700°C at a rate of 5°C / min and keeping the temperature for 40 minutes, then cooling the temperature to 500°C and keeping the temperature for 5 hours, cooling to room temperature, then heating the alloy powder to 250°C at a rate of 5°C / min and keeping the temperature for 5 hours, and obtaining a high temperature resistant alloy powder after cooling. Example 2

[0037] This embodiment provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), dissolving 8g of lanthanum chloride in 180ml of deionized water, then adding 1g of graphene oxide, ultrasonically dispersing for 40min, adding 60ml of ammonia solution (28-32%), heating to 75°C, reacting for 1h, centrifuging and separating the solid phase after the reaction, washing and drying, and keeping the temperature at 600°C for 2h under nitrogen protection, cooling, grinding and passing through a 300-mesh sieve to obtain a lanthanum oxide-graphene composite; Step (2), dispersing 4g of lanthanum oxide-graphene composite in a mixed liquid of 200ml of deionized water and 200ml of ethanol, ultrasonically dispersing for 30min, then adding 80g of 3-vinylbenzeneboric acid to obtain a mixed liquid, and then placing the mixed liquid in a 60Co radiation source for irradiation, the absorbed dose of irradiation is 400kGy, after the irradiation is completed, washing, filtering, drying, grinding and passing through a 300-mesh sieve to obtain a lanthanum oxide-boron-containing graphene composite.

[0038] Step (3), under nitrogen protection, 100 g of magnesium powder, 16.6 g of aluminum powder and 7.8 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h, then 8.5 g of lanthanum oxide-boron-containing graphene composite was added and ball-milled at 400 r / min for 3 h to obtain alloy powder; Step (4), under a nitrogen atmosphere, heating the alloy powder to 750°C at a rate of 5°C / min and keeping the temperature for 40 minutes, then cooling the temperature to 400°C and keeping the temperature for 5 hours, cooling to room temperature, then heating the alloy powder to 250°C at a rate of 5°C / min and keeping the temperature for 5 hours, and obtaining a high temperature resistant alloy powder after cooling.

[0039] Comparative Example 1 This comparative example provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), dispersing 4 g of graphene oxide in a mixed liquid of 200 ml of deionized water and 200 ml of ethanol, ultrasonically dispersing for 30 minutes, then adding 50 g of 3-vinylbenzeneboric acid to obtain a mixed liquid, then placing the mixed liquid in a 60Co radiation source for irradiation, the absorbed dose of the irradiation is 200 kGy, after the irradiation is completed, washing, filtering, drying, grinding and passing through a 300 mesh sieve to obtain boron-containing graphene oxide.

[0040] Step (2), under nitrogen protection, 100 g of magnesium powder, 12.4 g of aluminum powder and 6.7 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h, then 6.7 g of boron-containing graphene oxide was added and ball-milled at 400 r / min for 3 h to obtain alloy powder; Step (3), in a nitrogen atmosphere, heating the alloy powder to 700°C at a rate of 5°C / min and keeping the temperature for 40 minutes, then cooling the temperature to 500°C and keeping the temperature for 5 hours, cooling to room temperature, then heating the alloy powder to 250°C at a rate of 5°C / min and keeping the temperature for 5 hours, and obtaining a high temperature resistant alloy powder after cooling.

[0041] Comparative Example 2 This comparative example provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), dissolving 6 g of lanthanum chloride in 150 ml of deionized water, then adding 1 g of graphene oxide, ultrasonically dispersing for 40 min, adding 50 ml of ammonia solution (28-32%), heating to 65° C., reacting for 1 h, centrifuging and separating the solid phase after the reaction, washing and drying, and keeping the temperature at 650° C. for 2 h under nitrogen protection, cooling, grinding and passing through a 300-mesh sieve to obtain a lanthanum oxide-graphene composite; Step (2), under nitrogen protection, 100 g of magnesium powder, 12.4 g of aluminum powder and 6.7 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h, then 6.7 g of lanthanum oxide-graphene composite was added and ball-milled at 400 r / min for 3 h to obtain alloy powder; Step (4), under a nitrogen atmosphere, heating the alloy powder to 700°C at a rate of 5°C / min and keeping the temperature for 40 minutes, then cooling the temperature to 500°C and keeping the temperature for 5 hours, cooling to room temperature, then heating the alloy powder to 250°C at a rate of 5°C / min and keeping the temperature for 5 hours, and obtaining a high temperature resistant alloy powder after cooling.

[0042] Comparative Example 3 Step (1), dispersing 4 g of graphene oxide in a mixed liquid of 200 ml of deionized water and 200 ml of ethanol, ultrasonically dispersing for 30 minutes, then adding 50 g of 3-vinylbenzeneboric acid to obtain a mixed liquid, then placing the mixed liquid in a 60Co radiation source for irradiation, the absorbed dose of the irradiation is 200 kGy, after the irradiation is completed, washing, filtering, drying, grinding and passing through a 300 mesh sieve to obtain boron-containing graphene oxide.

[0043] Step (2), under nitrogen protection, 100 g of magnesium powder, 16.6 g of aluminum powder and 7.8 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h, then 4.25 g of boron-containing graphene oxide and 4.25 g of lanthanum oxide were added and ball-milled at 400 r / min for 3 h to obtain alloy powder; Step (3), under a nitrogen atmosphere, the alloy powder is heated to 750°C at a rate of 5°C / min and kept at that temperature for 40 minutes, then cooled to 400°C and kept at that temperature for 5 hours, cooled to room temperature, then heated to 250°C at a rate of 5°C / min and kept at that temperature for 5 hours, and then cooled to obtain a high temperature resistant alloy powder.

[0044] Comparative Example 4 Compared with Example 1, the difference between this comparative example and Example 1 is that the specific method of heat treatment is: heating the alloy powder to 250° C. at 5° C. / min, then keeping the temperature for 5 hours, and obtaining the high temperature resistant alloy powder after cooling.

[0045] Comparative Example 5 This comparative example provides a method for preparing a high temperature resistant alloy for additive manufacturing, comprising the following steps: Step (1), under nitrogen protection, 100 g of magnesium powder, 12.4 g of aluminum powder and 6.7 g of zinc powder were mixed evenly and ball-milled at 400 r / min for 2 h to obtain alloy powder; Step (2), in a nitrogen atmosphere, heating the alloy powder to 700°C at a rate of 5°C / min and keeping the temperature for 40 minutes, then cooling the temperature to 500°C and keeping the temperature for 5 hours, cooling to room temperature, then heating the alloy powder to 250°C at a rate of 5°C / min and keeping the temperature for 5 hours, and obtaining a high temperature resistant alloy powder after cooling.

[0046] Test Case 1. The tensile strength of the high temperature resistant alloy powders obtained in the examples and comparative examples at room temperature 25°C and 600°C was tested with reference to GB / T228.1-2010. The results are shown in Table 1.

[0047] 2. The high temperature resistant alloy powders obtained in the examples and comparative examples were subjected to wear resistance tests using a UMT-3 controlled environment friction and wear tester: pressure 100N, rotation speed 300r / min, time 90min, and the wear amount was measured. The results are shown in Table 1.

[0048] 3. Referring to GB / T 10125-199, the high temperature resistant alloy powders obtained in the examples and comparative examples were placed in a salt spray formed by a 5wt% NaCl solution for 8 hours and then placed for 16 hours. The average corrosion rate was measured to examine the corrosion resistance of the alloy. The results are shown in Table 1.

[0049]

[0050] It can be seen from the above performance test results that the high temperature resistance, wear resistance and corrosion resistance of Examples 1-2 are significantly improved, especially the comprehensive performance of Example 2 is the most outstanding, which is mainly because the synergistic effect between the lanthanum oxide and boron-containing graphene obtained by the present invention improves the performance of the alloy.

[0051] The comparative example does not adopt the necessary technical solution, resulting in its performance being significantly worse than that of the embodiment in the corresponding performance test. This better proves the irreplaceable nature of the specific technical solution of the present application in achieving technical effects and solving technical problems.

[0052] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing high temperature resistant alloy powder for additive manufacturing, characterized in that: The following steps are involved: Step (1), dissolving lanthanum chloride in a first solvent, then adding graphene oxide, and adding an ammonia solution after ultrasonic dispersion to carry out a primary reaction. After the reaction is completed, the solid phase is separated by centrifugation, washed, dried, and subjected to a heat-insulating reaction, and then cooled, ground, and sieved to obtain a lanthanum oxide-graphene composite; Step (2), dispersing the lanthanum oxide-graphene composite in a second solvent, uniformly dispersing by ultrasonication, then adding 3-vinylbenzeneboric acid to obtain a mixed solution, then placing the mixed solution in a 60Co radiation source for irradiation, washing, filtering, drying, grinding and sieving after the irradiation to obtain the lanthanum oxide-boron-containing graphene composite; Step (3), in a protective atmosphere, ball-milling the magnesium powder, aluminum powder and zinc powder, and then adding the lanthanum oxide-boron-containing graphene composite for secondary ball-milling to obtain an alloy powder; Step (4), heat treating the alloy powder to obtain a high temperature resistant alloy.

2. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (1), the first solvent is deionized water; And / or, in step (1), the usage ratio of the lanthanum chloride, the first solvent and the graphene oxide is (5-10 g): (100-200 ml): 1 g.

3. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (1), the ultrasonic treatment time is 30-60 minutes; And / or, in step (1), the volume ratio of the aqueous ammonia solution to the first solvent is (0.2-0.5): (0.5-1).

4. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (1), the primary reaction conditions are: reaction temperature 50-100°C, reaction time 0.5-2h; And / or, in step (1), the heat preservation reaction conditions are: heat preservation at 500-800° C. for 1-5 hours under nitrogen protection.

5. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (2), the second solvent is a mixture of water and ethanol, and the volume ratio of water to ethanol is 1:(1-2); And / or, in step (2), the usage ratio of the lanthanum oxide-graphene composite, the second solvent and 3-vinylbenzene boronic acid is 1g: (100-200ml): (10-50g).

6. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (2), the absorbed dose of the irradiation is 1-500 kGy; And / or, in step (2), the sieve used for screening is 200-400 mesh.

7. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (3), the protective atmosphere is nitrogen or argon; And / or, in step (3), the mass ratio of the magnesium powder, aluminum powder, zinc powder, and lanthanum oxide-boron-containing graphene composite is 100:(10-20):(1-10):(5-10).

8. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (3), the conditions of the first ball milling are: ball milling at 300-500 r / min for 1-3 h; And / or, in step (3), the conditions of the secondary ball milling are: ball milling at 300-500 r / min for 2-5 h.

9. The method for preparing high temperature resistant alloy powder for additive manufacturing according to claim 1, characterized in that: In step (4), the heat treatment conditions are: in a nitrogen atmosphere, heating to 600-800°C at 5-10°C / min and keeping warm for 30-60min, cooling to 400-600°C and keeping warm for 4-8h, cooling to room temperature and then heating to 200-300°C at 5-10°C / min and keeping warm for 2-6h.

10. A high temperature alloy powder used in the method for preparing high temperature alloy powder for additive manufacturing according to any one of claims 1 to 9.

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