Vanadium-aluminum alloy and preparation method thereof

Abstract

The invention discloses a vanadium-aluminum alloy and a preparation method thereof. The preparation method comprises the following steps: S101, coating the inner wall of a water-cooled copper crucible with a magnesium oxide coating; s102, vanadium pentoxide with the bulk density larger than 1.05 g / cm < 3 >, metal aluminum particles and a cooling agent are evenly mixed; s103, the mixed raw materials are added into a water-cooled copper crucible and subjected to water cooling, and after compaction, an aluminothermic reaction is triggered in the mode that an ignition agent is ignited on the upper portion; and after the thermit reaction is finished, water cooling is continuously carried out, and finally the finished vanadium-aluminum alloy is obtained. According to the preparation method, the water-cooled copper crucible is adopted as a reaction device, the solidification speed of alloy liquid can be increased, the specific gravity segregation of the alloy is effectively improved, and air holes in the alloy are reduced by controlling the bulk density of vanadium pentoxide, coating the inner wall of the crucible with a magnesium oxide coating and the like; therefore, the high-quality vanadium-aluminum alloy which is uniform in component, compact in crystal and free of obvious pores inside is obtained.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, specifically relating to a vanadium-aluminum alloy and its preparation method. Background Technology

[0002] Vanadium-aluminum alloys, as key additives in the production of titanium alloys, function similarly to ferrovanadium and vanadium nitrogen in steel: by introducing vanadium, the overall performance of titanium alloys can be significantly optimized, specifically by improving their strength, toughness, and formability, while enhancing their corrosion resistance and high-temperature stability, thereby expanding the application scenarios of titanium alloys. Based on these performance advantages, vanadium-aluminum alloys have become the second largest application of vanadium after steel, widely used in the manufacture of products with stringent material performance requirements, including but not limited to aerospace equipment such as seaplanes and gliders, automotive engine systems and chassis components, as well as civilian products such as golf clubs and medical equipment. They hold an irreplaceable position in aerospace, transportation, sports equipment, and medical devices.

[0003] In the preparation of titanium alloys, AlV55 alloy is one of the main vanadium-aluminum alloys used. Its production methods are mainly divided into two categories: one is the aluminothermic process, and the other is the two-step process (i.e., a combination of "aluminothermic reaction + refining"). The two-step process, due to the addition of a refining step after the aluminothermic reaction, can effectively remove impurities and adjust the composition distribution in the alloy. Therefore, compared to the direct aluminothermic process, AlV55 alloy prepared by the two-step method has significant advantages in compositional uniformity and apparent quality, meeting the production requirements of titanium alloys with high purity requirements.

[0004] However, the two-step method also has significant drawbacks: the additional refining process not only increases the investment cost and energy consumption of production equipment, but also prolongs the production cycle, resulting in a production cost that is significantly higher than that of the aluminothermic method, and the production efficiency is low, making it difficult to meet the demand for large-scale, low-cost AlV55 alloy mass production.

[0005] In contrast, the aluminothermic process, with its simple process flow, low equipment investment, and short production cycle, has natural advantages in terms of cost and efficiency, making it the preferred method for low-cost AlV55 alloy preparation. However, existing aluminothermic methods for preparing AlV55 alloys are prone to problems such as alloy segregation (i.e., uneven distribution of elements in the alloy) and excessive internal porosity due to factors such as differences in raw material density, porosity in the raw materials, and poor gas escape during the reaction process. This results in insufficient product performance stability, making it difficult to meet the requirements of high-quality titanium alloys for the uniformity and density of AlV55 alloy composition, thus limiting the application of the aluminothermic process in the production of high-specification AlV55 alloys.

[0006] Therefore, how to optimize the existing aluminothermic process, while retaining its advantages of low cost and high efficiency, effectively improve the segregation phenomenon of AlV55 alloy, reduce the porosity inside the alloy, and thus improve product quality to meet the needs of titanium alloy preparation, has become an urgent technical problem to be solved in the current vanadium-aluminum alloy production field. Summary of the Invention

[0007] To address the shortcomings of the prior art, a vanadium-aluminum alloy and its preparation method are provided. This preparation method can obtain a high-quality vanadium-aluminum alloy with uniform composition, dense crystallization, and no obvious internal pores.

[0008] To achieve the above objectives, the following technical solution is adopted: This invention provides a method for preparing a vanadium-aluminum alloy, comprising the following steps: S101. Coat the inner wall of the water-cooled copper crucible with a magnesium oxide coating; S102, for materials with a bulk density greater than 1.05 g / cm³ 3 Vanadium pentoxide, aluminum granules, and coolant are mixed evenly; S103. Add the mixed raw materials into a water-cooled copper crucible and cool it with water. After compaction, trigger the aluminothermic reaction by igniting the igniter in the upper part. After the aluminothermic reaction is completed, continue to cool with water to obtain the finished vanadium-aluminum alloy.

[0009] In some embodiments, the magnesium oxide coating is prepared by using large-crystal fused magnesia and a binder; after the coating is applied to the inner wall, it is baked at a temperature of 120–150°C for 40–60 min; wherein the coating thickness is 5–10 mm.

[0010] In some embodiments, the magnesium oxide mass fraction of the large-crystal fused magnesia is 99.0%, and the particle size is 200-300 mesh; the binder is selected from one or more of aluminum dihydrogen phosphate, aluminum phosphate, aluminum polyphosphate, and magnesium phosphate.

[0011] In some embodiments, the bulk density is greater than 1.05 g / cm³. 3 Vanadium pentoxide is obtained by direct calcination of ammonium polyvanadate or by melting and grinding ammonium polyvanadate sheets.

[0012] In some embodiments, vanadium pentoxide is baked to remove moisture before being mixed with aluminum granules and a coolant, at a baking temperature of 80–100°C for 1–1.5 hours.

[0013] In some embodiments, the coolant is selected as vanadium-aluminum alloy fine powder.

[0014] In some embodiments, the amount of vanadium pentoxide added is 100kg to 150kg, and the particle size of vanadium pentoxide is ≤5mm; the particle size of metallic aluminum particles is 1mm to 3mm, and the particle size of vanadium-aluminum alloy fine powder is ≤1mm.

[0015] In some embodiments, vanadium pentoxide has a purity of ≥98.5%, wherein Fe≤0.10%, Si≤0.10%, and Na2O+K2O≤0.80%; and aluminum granules have a purity of ≥99.5%, wherein Fe≤0.01% and Si≤0.01%.

[0016] In some embodiments, in step S102, the bulk density is greater than 1.05 g / cm³. 3 The vanadium pentoxide and metallic aluminum particles are calculated and weighed based on a theoretical vanadium content of 57.5% to 59.0%; the unit furnace charge heat is designed to be 3350 kJ / kg to 3450 kJ / kg.

[0017] The present invention also provides a vanadium-aluminum alloy, which is prepared by the preparation method described above, wherein the vanadium content segregation in the vanadium-aluminum alloy is less than 0.3%.

[0018] The present invention has the following beneficial technical effects: The method for preparing vanadium-aluminum alloy of the present invention uses a water-cooled copper crucible as a reaction device, which can accelerate the solidification rate of the alloy liquid and effectively improve the specific gravity segregation of the alloy. By controlling the bulk density of vanadium pentoxide and coating the inner wall of the crucible with magnesium oxide, the generation of internal pores in the alloy is reduced, thereby obtaining a high-quality vanadium-aluminum alloy with uniform composition, dense crystallization and no obvious internal pores. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the preparation method of the vanadium-aluminum alloy of the present invention; Figure 2 A scanning electron microscope image of the vanadium flakes prepared by direct calcination of APV according to the present invention; Figure 3 A scanning electron microscope image of vanadium powder prepared by post-melting and grinding of APV sheet according to the present invention; Figure 4 This is a schematic diagram of the vanadium-aluminum alloy sampling points of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0022] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0023] In view of the above objectives, one aspect of the embodiments of the present invention is as follows: Figure 1 As shown, a method for preparing a vanadium-aluminum alloy is proposed. The preferred vanadium-aluminum alloy is AlV55 alloy, in which the V content is 58%. 59%.

[0024] The above method includes the following steps: S101. Coat the inner wall of the water-cooled copper crucible with a magnesium oxide coating; S102, for materials with a bulk density greater than 1.05 g / cm³ 3 Vanadium pentoxide, aluminum granules, and coolant are mixed evenly; S103. Add the mixed raw materials into a water-cooled copper crucible and cool it with water. After compaction, trigger the aluminothermic reaction by igniting the igniter in the upper part. After the aluminothermic reaction is completed, continue to cool with water to obtain the finished vanadium-aluminum alloy.

[0025] Vanadium-aluminum alloys are mainly composed of two elements, V and Al, with V having a density of approximately 6.1 g / cm³. 3 The density of Al is approximately 2.7 g / cm³. 3 After the aluminothermic reaction occurs, the reaction releases a large amount of heat, causing the generated vanadium (V) and excess al to melt. However, due to the significant difference in their densities, the less dense al rises to the surface under the influence of gravity, while the denser vanadium sinks, resulting in a certain degree of gravity segregation. Therefore, using a water-cooled copper crucible as the reaction device can accelerate the solidification rate of the alloy liquid and effectively improve the gravity segregation of the alloy. Furthermore, controlling the bulk density of vanadium powder and coating the inner wall of the crucible with magnesia clay can reduce the formation of internal porosity in the alloy.

[0026] Magnesia refractory mortar, also known as magnesia-based refractory mortar, is an unshaped refractory material formulated with magnesia as the core raw material, along with appropriate binders and additives. It requires no pre-forming and can be directly applied, laid, or filled. Its core characteristics are high-temperature resistance and corrosion resistance. The magnesia refractory mortar mentioned in the embodiments of this invention is a magnesium oxide coating.

[0027] The water-cooled copper crucible preferably employs a cooling coil system with multiple coils running along the outer wall of the crucible from the opening to the bottom. The inlet and outlet of the cooling coil are spaced apart, with the lower end being the inlet and the upper end being the outlet. Cooling water is preferably used as the coolant.

[0028] Throughout the reaction, the cooling water in the water-cooled copper crucible remains on until cooling is complete. However, the flow rate of the cooling water varies. At the beginning of the aluminothermic reaction, the cooling water flow rate is higher because the aluminothermic reaction releases a large amount of heat instantaneously. To ensure the copper crucible temperature remains below 1000℃, the cooling water can provide a cooling rate of approximately 1200~1500℃ / s at this stage. After the aluminothermic reaction ends, the cooling water flow rate is gradually reduced, slowly decreasing to 50~100℃ / s within 20~30 minutes, until cooling is complete, the furnace is dismantled, and the finished vanadium-aluminum alloy is obtained. After this process, the cooling water is then turned off.

[0029] Careful adjustment of the cooling process can improve segregation and reduce the content of the brittle phase Al8V5, which helps reduce microcracks inside the alloy and fine powder generated during later crushing.

[0030] In some embodiments, in step S102, the bulk density is greater than 1.05 g / cm³. 3 Vanadium pentoxide, aluminum granules, and coolant are loaded into a container and mixed for 15–25 minutes.

[0031] In some embodiments, the magnesium oxide coating is prepared by using large-crystal fused magnesia and a binder; after the coating is applied to the inner wall, it is baked at a temperature of 120–150°C for 40–60 min; wherein the coating thickness is 5–10 mm.

[0032] In some embodiments, the magnesium oxide mass fraction of the large-crystal fused magnesia is 99.0%, and the particle size is 200-300 mesh; the binder is selected from one or more of aluminum dihydrogen phosphate, aluminum phosphate, aluminum polyphosphate, and magnesium phosphate.

[0033] Among them, the large-crystal fused magnesia grade LFM99 is fused magnesia fine powder (particle size of 200-300 mesh).

[0034] In some embodiments, the bulk density is greater than 1.05 g / cm³. 3 Vanadium pentoxide is obtained by direct calcination of ammonium polyvanadate or by melting and grinding ammonium polyvanadate sheets. To obtain a vanadium-aluminum alloy with no obvious internal porosity and good surface quality, a bulk density greater than 1.05 g / cm³ is required. 3 High-purity V₂O₅ can be obtained by direct calcination of APV (ammonium polyvanadate) or by melting and grinding APV sheets, because it can be analyzed by SEM (scanning electron microscopy). Figure 2and Figure 3 It can be observed that these two types of high-purity V2O5 particles have the fewest internal pores, which can minimize the generation of internal pores in the alloy.

[0035] APV direct calcination: Ammonium polyvanadate (APV) is directly placed into a calcination device for heating and calcination. By controlling the calcination temperature, time, atmosphere and other conditions, APV undergoes chemical reactions such as dehydration and deammoniation, and finally produces vanadium pentoxide (V2O5).

[0036] APV flake-forming followed by crushing and grinding: First, ammonium polyvanadate (APV) is melted into a liquid or semi-liquid state. Then, the molten material is cooled and formed into flakes or blocks; this process is called flake-forming. Afterward, the flake-forming material is crushed into powder of the desired particle size using mechanical processing methods such as crushing and grinding. Crushing uses mechanical force to break large pieces of material into smaller pieces, while grinding further grinds the smaller pieces into finer powder.

[0037] In some embodiments, vanadium pentoxide is baked to remove moisture before being mixed with metallic aluminum particles and a coolant. The baking temperature is 80–100°C, and the baking time is 1–1.5 hours. To obtain a vanadium-aluminum alloy with no obvious internal pores and good surface quality, V2O5 must be baked to remove excess moisture before being added to the mixture.

[0038] In some embodiments, the coolant is selected as vanadium-aluminum alloy fine powder.

[0039] In some embodiments, in order to obtain a vanadium-aluminum alloy with good slag and alloy separation effect and a segregation of the main element V within 0.3%, the amount of vanadium pentoxide added is 100kg to 150kg, the particle size of vanadium pentoxide is ≤5mm, the particle size of metallic aluminum particles is 1mm to 3mm, and the particle size of vanadium-aluminum alloy fine powder is ≤1mm.

[0040] In some embodiments, in order for the impurity content of the vanadium-aluminum alloy to meet the standard requirements, the purity of vanadium pentoxide is ≥98.5%, wherein Fe≤0.10%, Si≤0.10%, and Na2O+K2O≤0.80%; the purity of the aluminum particles is ≥99.5%, wherein Fe≤0.01% and Si≤0.01%.

[0041] In some embodiments, in step S102, the bulk density is greater than 1.05 g / cm³. 3 The vanadium pentoxide and metallic aluminum particles were calculated and weighed based on a theoretical vanadium content of 57.5%–59.0%; the unit furnace charge heat was designed at 3350 kJ / kg–3450 kJ / kg. The chemical composition of the coolant vanadium-aluminum alloy fine powder met the requirements of YS / T 579-2014 standard.

[0042] The present invention also provides a vanadium-aluminum alloy, which is prepared by the preparation method described above, wherein the vanadium content segregation in the vanadium-aluminum alloy is less than 0.3%.

[0043] The present invention will be further illustrated by the following examples.

[0044] Example 1 A magnesium oxide coating was applied to the inner wall of a water-cooled copper crucible. The coating was prepared by adding water to fused magnesia fine powder (200-300 mesh) of grade LFM 99 and a binder of dihydroxyaluminate phosphate. The coating thickness was 5 mm, and the baking temperature was 120℃ for 60 min. Based on a theoretical V content of 57.5% and a unit furnace charge heat of 3350 kJ / kg, the bulk density of 100 kg was calculated to be 1.05 g / cm³. 3 High-purity V2O5 (obtained by direct calcination of APV, purity 99.2%, including 0.09% Fe, 0.08% Si, 0.65% Na2O+K2O, particle size ≤1mm) was baked at 80℃ for 1.5h. Then, 90.87kg of high-purity metallic Al (purity 99.5%, including 0.007% Fe, 0.008% Si, particle size 1-2mm) and 11.59kg of vanadium-aluminum alloy fine powder with chemical composition meeting the requirements of YS / T 579-2014 standard were weighed. The weighed materials were loaded into a material tank, mixed for 15min, and then loaded into the furnace, compacted, and the aluminothermic reaction was triggered by igniting the igniter in the upper part. After cooling, the furnace was dismantled to obtain a high-quality vanadium-aluminum alloy with uniform composition (the main element V segregation was 0.23%), dense crystals, and no obvious pores inside.

[0045] Example 2 A magnesium oxide coating was applied to the inner wall of a water-cooled copper crucible. The coating was prepared by adding water to fused magnesia fine powder (200-300 mesh) of grade LFM 99 and a binder of dihydroalumina phosphate. The coating thickness was 10 mm, and the baking temperature was 150℃ for 40 min. Based on a theoretical V content of 59.0% and a unit furnace charge heat of 3450 kJ / kg, the bulk density of 150 kg was calculated to be 1.80 g / cm³. 3High-purity V2O5 (obtained by crushing and grinding APV sheet, purity 98.5%, including 0.10% Fe, 0.09% Si, 0.80% Na2O+K2O, particle size ≤5mm) was baked at 100℃ for 1 hour. Then, 136.32 kg of high-purity metallic Al (purity 99.6%, including 0.008% Fe, 0.006% Si, particle size 2-3mm) and 8.58 kg of vanadium-aluminum alloy fine powder with chemical composition meeting the requirements of YS / T 579-2014 standard were weighed. The weighed materials were loaded into a material tank and mixed for 20 minutes before being loaded into the furnace, compacted, and the aluminothermic reaction was triggered by igniting the igniter in the upper part. After cooling, the furnace was dismantled to obtain a high-quality vanadium-aluminum alloy with uniform composition (the main element V segregation was 0.28%), dense crystals, and no obvious internal pores.

[0046] Example 3 A magnesium oxide coating was applied to the inner wall of a water-cooled copper crucible. The coating was prepared by adding water to fused magnesia fine powder (200-300 mesh) of grade LFM 99 and a binder of dihydroxyaluminate phosphate. The coating thickness was 8 mm, and the baking temperature was 140℃ for 50 min. Based on a theoretical V content of 58.5% and a unit furnace charge heat of 3400 kJ / kg, the bulk density of 120 kg was calculated to be 1.08 g / cm³. 3 High-purity V2O5 (obtained by direct calcination of APV, purity 99.3%, including 0.10% Fe, 0.09% Si, 0.75% Na2O+K2O, particle size ≤1mm) was baked at 90℃ for 1.3h. Then, 109.05kg of high-purity metallic Al (purity 99.7%, including 0.007% Fe, 0.007% Si, particle size 2-3mm) and 10.33kg of vanadium-aluminum alloy fine powder with chemical composition meeting the requirements of YS / T 579-2014 standard were weighed. The weighed materials were loaded into a material tank and mixed for 18min before being loaded into the furnace, compacted, and the aluminothermic reaction was triggered by igniting the igniter in the upper part. After cooling, the furnace was dismantled to obtain a high-quality vanadium-aluminum alloy with uniform composition (the main element V segregation was 0.26%), dense crystals, and no obvious internal pores.

[0047] Comparative Example The sintering furnace using ordinary refractory materials is not coated with magnesium oxide on its inner wall.

[0048] Using 100kg of material with a bulk density of 0.5g / cm³ 3 High-purity V2O5; weigh 90.87 kg of high-purity metallic Al (purity 99.5%, of which Fe is 0.007%, Si is 0.008%, particle size 1-2 mm) and 11.59 kg of vanadium-aluminum alloy fine powder whose chemical composition meets the requirements of YS / T579-2014 standard.

[0049] After weighing the materials, put them into the hopper, mix for 15 minutes, then load them into the furnace and compact them.

[0050] The thermite reaction is triggered by igniting the igniter at the top, and the reaction is controlled according to the theoretical V content of 57.5% and the heat of the unit charge of 3350 kJ / kg.

[0051] Cooling and dismantling: Dismantle the furnace after cooling is complete.

[0052] The final vanadium-aluminum alloy product had obvious defects: the composition of the main element V was segregated by 0.8%, there were many dispersed pores inside the alloy, the crystal density was poor, and the overall quality did not meet the requirements of high-quality vanadium-aluminum alloy.

[0053] <Evaluation Criteria> The following method was used to measure and calculate the percentage of component segregation of the main element V in the embodiments of the present invention: like Figure 4 As shown, the percentage of element V content at three points (top, middle, and bottom) along the edge of the prepared vanadium-aluminum alloy, and the percentage of element V content at three points (top, middle, and bottom) along the middle line, are presented. The compositional segregation value of the main element V is the difference between the maximum and minimum values ​​after sampling and analysis at the six points shown in the figure.

[0054] As can be seen from the above examples and comparative examples, the segregation of the main element V in the vanadium-aluminum alloys of Examples 1-3 is within 0.3%. However, the comparative examples, which did not use the preparation method of this invention, show a segregation of the main element V in their vanadium-aluminum alloys that is much greater than 0.3%.

[0055] The density of vanadium-aluminum alloy crystals and the presence or absence of obvious pores are generally macroscopically visible. The presence or absence of pores or the density of vanadium-aluminum alloy crystals (whether the structure is loose) can be judged manually by observing the vanadium-aluminum alloy.

[0056] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. Although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0057] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preparing a vanadium-aluminum alloy, characterized in that, Includes the following steps: S101. Coat the inner wall of the water-cooled copper crucible with a magnesium oxide coating; S102, for materials with a bulk density greater than 1.05 g / cm³ 3 Vanadium pentoxide, aluminum granules, and coolant are mixed evenly; S103. Add the mixed raw materials into a water-cooled copper crucible and cool it with water. After compaction, trigger the aluminothermic reaction by igniting the igniter in the upper part. After the aluminothermic reaction is completed, continue to cool with water to obtain the finished vanadium-aluminum alloy.

2. The method for preparing vanadium-aluminum alloy according to claim 1, characterized in that, The magnesium oxide coating is prepared by electrofused magnesia with large crystals and a binder. After the coating is applied to the inner wall, it is baked at a temperature of 120-150°C for 40-60 minutes. The coating thickness is 5-10 mm.

3. The method for preparing vanadium-aluminum alloy according to claim 2, characterized in that, The magnesium oxide content of the large-crystal fused magnesia is 99.0% by mass, and the particle size is 200-300 mesh; the binder is selected from one or more of aluminum dihydrogen phosphate, aluminum phosphate, aluminum polyphosphate, and magnesium phosphate.

4. The method for preparing vanadium-aluminum alloy according to claim 1, characterized in that, Bulk density greater than 1.05 g / cm³ 3 Vanadium pentoxide is obtained by direct calcination of ammonium polyvanadate or by melting and grinding ammonium polyvanadate sheets.

5. The method for preparing vanadium-aluminum alloy according to claim 4, characterized in that, Vanadium pentoxide is baked to remove moisture before being mixed with aluminum granules and coolant. The baking temperature is 80-100℃ and the baking time is 1-1.5h.

6. The method for preparing vanadium-aluminum alloy according to claim 1, characterized in that, The coolant is made of vanadium-aluminum alloy fine powder.

7. The method for preparing vanadium-aluminum alloy according to claim 6, characterized in that, The amount of vanadium pentoxide added is 100kg to 150kg, and the particle size of vanadium pentoxide is ≤5mm; the particle size of metallic aluminum particles is 1mm to 3mm, and the particle size of vanadium-aluminum alloy fine powder is ≤1mm.

8. The method for preparing vanadium-aluminum alloy according to claim 1, characterized in that, Vanadium pentoxide has a purity of ≥98.5%, of which Fe≤0.10%, Si≤0.10%, and Na2O+K2O≤0.80%; aluminum granules have a purity of ≥99.5%, of which Fe≤0.01% and Si≤0.01%.

9. The method for preparing vanadium-aluminum alloy according to claim 1, characterized in that, In step S102, the bulk density is greater than 1.05 g / cm³. 3 The vanadium pentoxide and metallic aluminum particles are calculated and weighed based on a theoretical vanadium content of 57.5% to 59.0%; the unit furnace charge heat is designed to be 3350 kJ / kg to 3450 kJ / kg.

10. A vanadium-aluminum alloy, characterized in that, The alloy is prepared by any one of the preparation methods according to claims 1-9, wherein the vanadium content segregation in the vanadium-aluminum alloy is less than 0.3%.

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