Method for controlling carbon content of vanadium-aluminum alloy

Abstract

The invention relates to the field of metallurgy, and provides a vanadium-aluminum alloy carbon content control method which comprises the following steps: preheating a graphite crucible, cleaning residues on the surface layer of the inner wall of the graphite crucible, soaking the graphite crucible with a chemical solvent within a preset time, and flushing the soaked graphite crucible with high-pressure water flow; the washed graphite crucible is dried, and white corundum is laid at the bottom of the graphite crucible; vanadium pentoxide and aluminum particles are placed in a graphite crucible to be smelted, the vanadium-aluminum alloy is produced, and the carbon content of the vanadium-aluminum alloy is sampled and analyzed. By reducing the carbon content in the vanadium-aluminum alloy, the purity and quality of the alloy can be remarkably improved, impurities and defects in the alloy are reduced, and the mechanical property and corrosion resistance of the alloy are improved. By reducing the carbon content and other impurities in the crucible, the instability and uncertainty in the production process can be reduced, the production efficiency and the product quality are improved, and corrosion and abrasion of the crucible are reduced.

Description

Technical Field

[0001] The present invention relates to the field of metallurgy, and more particularly to a method for controlling the carbon content of vanadium-aluminum alloy. Background Art

[0002] Vanadium-aluminum alloy is an important intermediate alloy and an important additive for manufacturing titanium alloys. It can improve the comprehensive properties of titanium materials such as strength, corrosion resistance, plasticity and toughness. Therefore, it is widely used in many fields such as aerospace, vehicle manufacturing, new energy, electronics, construction, metallurgical chemistry and medicine. Especially, it shows unique advantages in manufacturing high-temperature structural parts, automotive parts, solar cell materials, heat-conducting materials for electronic components and medical devices. During the application process, if the carbon content of vanadium-aluminum alloy is too high, it is easy to cause heat treatment distortion, deformation and grain boundary hydrogen embrittlement of titanium alloy, thus affecting the corrosion resistance of titanium alloy and even causing cracks and corrosion phenomena.

[0003] During the smelting process of vanadium-aluminum alloy, as an important smelting container, the cleanliness and corrosion resistance of the graphite crucible directly affect the carbon content and quality of the alloy. The traditional cleaning method of graphite crucible often has problems such as incomplete cleaning and easy introduction of impurities, resulting in the carbon content of the smelted vanadium-aluminum alloy exceeding the standard and affecting the performance and application of the alloy. Summary of the Invention

[0004] Based on the above object, the present invention proposes a method for controlling the carbon content of vanadium-aluminum alloy, including the following steps: Perform preheating treatment on the graphite crucible, clean the residue on the inner wall surface layer of the graphite crucible, soak the graphite crucible with a chemical solvent within a preset time, and rinse the soaked graphite crucible with high-pressure water flow; Dry the rinsed graphite crucible and lay white corundum at the bottom of the graphite crucible; Put vanadium pentoxide and aluminum particles in the graphite crucible for melting, produce vanadium-aluminum alloy and sample to analyze the carbon content of the vanadium-aluminum alloy.

[0005] In some embodiments, the chemical solvent includes dilute nitric acid.

[0006] In some embodiments, the molar concentration range of the dilute nitric acid is 15%-20%.

[0007] In some embodiments, during the process of soaking the graphite crucible with the chemical solvent, the soaking temperature is also adjusted, wherein the range of the soaking temperature is 20-60°C.

[0008] In some embodiments, the preset time is 10-15 minutes.

[0009] In some embodiments, during the process of rinsing the soaked graphite crucible with high-pressure water flow, it further includes controlling the pressure of the water flow, where the range of the water flow pressure is 10 - 50 MPa.

[0010] In some embodiments, the particle size range of the white fused alumina is 1 - 3 mm.

[0011] In some embodiments, by mass percentage, the carbon content of the vanadium-aluminum alloy ranges from less than or equal to 0.02%.

[0012] In some embodiments, during the process of smelting vanadium pentoxide and aluminum pellets in a graphite crucible, it further includes Adding less than 1 / 2 of the aluminum pellets and vanadium pentoxide into the graphite crucible to generate the initial phase of the vanadium-aluminum alloy; When the reaction is stable, gradually add the remaining aluminum pellets and vanadium pentoxide; Continuously detect the gas pressure, and introduce an inert gas or a reducing gas when the gas pressure is lower than the preset value.

[0013] In some embodiments, during the process of sampling and analyzing the carbon content of the vanadium-aluminum alloy, it further includes Sampling the vanadium-aluminum alloy to obtain a specimen; Burning the specimen in a high-temperature combustion furnace with an oxygen stream introduced to generate carbon dioxide; Absorbing the carbon dioxide with water and generating barium carbonate precipitate through acid-base titration and barium ions, and measuring the concentration of barium ions after the dissolution of the barium carbonate precipitate by ICP; Calculating the carbon content in the specimen according to the preset standard curve of the barium ion concentration and the carbon content.

[0014] The present invention has at least the following beneficial technical effects: By reducing the carbon content in the vanadium-aluminum alloy, the present invention can significantly improve the purity and quality of the alloy, reduce impurities and defects in the alloy, and improve the mechanical properties and corrosion resistance of the alloy. By reducing the carbon content and other impurities in the crucible, the instability and uncertainty in the production process can be reduced, the production efficiency and product quality can be improved, the corrosion and wear of the crucible can be reduced, the service life of the crucible can be extended, and the production cost can be reduced. Description of the Drawings

[0015] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 A flowchart showing a method for controlling the carbon content of a vanadium-aluminum alloy according to an embodiment of the present invention is shown. Detailed Embodiments

[0016] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present disclosure, and are not intended to limit the present disclosure.

[0017] In addition, the mention of "embodiment" in this article means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0018] Those skilled in the art of this technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the field to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as in the embodiments of this application.

[0019] The present invention provides a method for controlling the carbon content of vanadium-aluminum alloy. Please refer to Figure 1 , which includes the following steps: Preheat the graphite crucible, clean the residues on the inner surface layer of the graphite crucible, soak the graphite crucible in a chemical solvent within a preset time, and rinse the soaked graphite crucible with high-pressure water flow; Dry the rinsed graphite crucible and lay white corundum at the bottom of the graphite crucible; Put vanadium pentoxide and aluminum pellets in the graphite crucible for melting to produce vanadium-aluminum alloy and sample and analyze the carbon content of the vanadium-aluminum alloy.

[0020] The crucible plays a crucial role in the melting process. It can not only withstand high temperatures and the erosion of molten metal, but also provide a relatively closed reaction environment, which helps to reduce the contact between the metal and air, thereby reducing oxidation losses.

[0021] In an alloy, the interaction forces between elements (such as metallic bonds, covalent bonds, etc.) determine their bonding modes and the properties of the alloy. As a non-metallic element, carbon has different atomic radii and electronegativities from metal elements such as vanadium and aluminum. Therefore, specific crystal structures and phase compositions may be formed in the alloy. Generally, carbides are formed, such as vanadium carbide (VC), and these carbides exist in the alloy in the form of impurities. The content and existence form of carbon (such as carbides) will affect the properties of the alloy, such as hardness, toughness, and corrosion resistance.

[0022] For carbon content control, the present invention effectively removes residues and impurities in the graphite crucible through four-step fine cleaning, thereby reducing the carbon content of the alloy during the smelting process. Its main steps are as follows: Preliminary cleaning: Empty the residues accumulated inside the graphite crucible and gently remove them using tools such as stainless steel tweezers or cotton swabs to avoid damaging the graphite crucible. This step aims to remove obvious solid residues. Chemical cleaning: Use a specific chemical cleaning agent, dilute nitric acid, to soak and clean the graphite crucible. The choice of the cleaning agent should be determined according to the types of residues in the graphite crucible to ensure the cleaning effect. This step removes deposits and difficult-to-remove impurities on the surface of the graphite crucible through chemical action. Physical flushing: Use a high-pressure water gun or a rotating flushing device to physically flush the graphite crucible to thoroughly remove fine particles and attachments that cannot be removed by the cleaning agent. This step improves the cleaning effect through physical flushing force to ensure the cleanliness of the surface of the graphite crucible. Laying an isolation layer: Lay a refractory layer with a thickness of 1-3 mm to isolate the reaction materials from the inside of the crucible, reduce the corrosion of the crucible by the materials during the reaction, and reduce the introduction of carbon during the smelting process.

[0023] Based on the vanadium-aluminum alloy, its principle, and the important ways for carbon to enter the alloy, the present invention summarizes and proposes a method for cleaning the graphite crucible in four steps to reduce the carbon content of the vanadium-aluminum alloy. Through fine cleaning steps and reasonable selection of cleaning agents, it effectively removes residues and impurities in the graphite crucible, reduces the carbon content of the alloy during the smelting process, with C≤0.02% in the product, reaching the international leading level, and improves the quality and production efficiency of the alloy.

[0024] In some embodiments, the chemical solvent includes dilute nitric acid.

[0025] For carbon-containing residues or other substances that are difficult to dissolve in hydrochloric acid, nitric acid can be used for cleaning. Nitric acid has strong oxidizing properties and can be appropriately heated during cleaning, but attention should be paid to controlling the temperature to avoid the crucible cracking.

[0026] In some embodiments, the molar concentration range of the dilute nitric acid is 15%-20%.

[0027] In some embodiments, during the process of soaking the graphite crucible with the chemical solvent, it also includes adjusting the soaking temperature, wherein the range of the soaking temperature is 20-60°C.

[0028] Although the graphite crucible is heat-resistant, too high a temperature may cause changes in its structure or cracks. Therefore, when choosing the soaking temperature, it is necessary to ensure that this temperature does not exceed the tolerance range of the graphite crucible.

[0029] In some embodiments, the preset time is 10-15 minutes.

[0030] In some embodiments, during the process of rinsing the soaked graphite crucible with high-pressure water flow, it further includes controlling the pressure of the water flow, wherein the range of the water flow pressure is 10 - 50 MPa.

[0031] The pressure of the high-pressure water flow can be controlled within the range of 10 - 50 MPa (or 100 - 500 bar), which is sufficient to wash away the residues on the inner wall of the graphite crucible, and at the same time, it will not cause the graphite crucible to crack or deform due to excessive pressure.

[0032] In some embodiments, the particle size range of the white fused alumina is 1 - 3 mm.

[0033] The white fused alumina itself has extremely high hardness, with a Mohs hardness of 9.0, second only to diamond. The particle size range of 1 - 3 mm not only ensures its high-hardness characteristics but also facilitates processing and handling. While maintaining high hardness, it also has good toughness and can withstand high-temperature environments in the crucible without softening or deforming. At the same time, it can further isolate the carbon in the crucible from entering the vanadium-aluminum alloy.

[0034] In some embodiments, please refer to Figure 1 , by mass percentage, the carbon content range of the vanadium-aluminum alloy is less than or equal to 0.02%.

[0035] The vanadium-aluminum alloy itself has the characteristics of high strength and high hardness. Controlling the carbon content at an extremely low level (less than or equal to 0.02%) can further reduce the negative impact of carbon elements on the alloy performance, thereby maintaining or enhancing the strength and hardness of the alloy.

[0036] Carbon promotes the corrosion reaction of the alloy and reduces the corrosion resistance of the alloy. By controlling the carbon content, this corrosion risk can be reduced, enabling the vanadium-aluminum alloy to maintain good performance in harsh environments. The vanadium-aluminum alloy with low carbon content is easier to control during the processing, and can reduce processing problems caused by carbon elements, such as cracks and deformations, thereby improving the processing efficiency and product quality.

[0037] In some embodiments, please refer to Figure 1 , during the process of melting vanadium pentoxide and aluminum particles in a graphite crucible, it further includes Adding less than 1 / 2 of the aluminum particles and vanadium pentoxide to the graphite crucible to generate the initial phase of the vanadium-aluminum alloy; When the reaction is stable, gradually add the remaining aluminum particles and vanadium pentoxide; Continuously detect the gas pressure, and introduce inert gas or reducing gas when the air pressure is lower than the preset value.

[0038] Before formal smelting, the graphite crucible needs to be preheated to remove the moisture and gas inside, avoiding the crucible cracking caused by rapid temperature rise. The preheating temperature should be gradually increased to below 400°C and maintain a certain heating rate. It is usually recommended not to exceed 100°C / hour to avoid thermal stress concentration and crucible damage caused by rapid temperature rise. When the temperature exceeds 600°C, the heating rate can be increased to reach the smelting temperature as soon as possible. During cooling, the cooling rate should also be controlled to avoid thermal stress concentration and crucible cracking caused by too fast cooling.

[0039] During the smelting process, introducing an inert gas or a reducing gas can protect the melt from oxygen erosion, reduce the occurrence of oxidation reactions, and thus improve the product quality. It is necessary to continuously monitor the gas pressure to determine whether to introduce an inert gas or a reducing gas according to the gas pressure. The gas flow rate should be determined according to the size of the smelting furnace and the surface area of the melt to ensure that the melt surface is always covered by the gas.

[0040] In the crucible smelting method, vanadium pentoxide ( ) is used as the vanadium source, and aluminum pellets are used as the reducing agent. Under high-temperature conditions, aluminum undergoes a thermite reduction reaction with vanadium pentoxide to produce metallic vanadium and aluminum oxide. This reaction can be represented by the following chemical equation: 3 + 10Al → 6V + 5 + a large amount of heat.

[0041] This reaction is a strong exothermic reaction that can generate a large amount of heat, causing the reaction system to rapidly heat up, thereby promoting the formation of metallic vanadium and the melting of the aluminum liquid.

[0042] Based on the thermite reduction reaction, the generated metallic vanadium, together with the remaining aluminum liquid and possibly added other alloying elements, is smelted in the crucible. During the smelting process, the interaction between metal atoms makes them gradually mix evenly to form a vanadium-aluminum alloy.

[0043] The smelting temperature is usually higher than the melting point of the metal to ensure that all metals can be completely melted and form a uniform alloy liquid. At the same time, the atmosphere and impurity content also need to be controlled during the smelting process to avoid oxidation or contamination of the alloy.

[0044] In some embodiments, referring to Figure 1 , the process of sampling and analyzing the carbon content of the vanadium-aluminum alloy further includes, Sampling the vanadium-aluminum alloy to obtain a sample; Burning the sample in a high-temperature combustion furnace with an oxygen stream to generate carbon dioxide; Absorbing the carbon dioxide with water and generating barium carbonate precipitate through acid-base titration and barium ions, and measuring the barium ion concentration after the dissolution of the barium carbonate precipitate by ICP; Calculate the carbon content in the sample according to the preset standard curve of barium ion concentration and carbon content.

[0045] Convert carbon into an element form suitable for ICP analysis, because ICP is mainly used to detect metals and certain non-metal elements and does not directly detect carbon.

[0046] The high-temperature combustion furnace can quickly heat the sample to the combustion temperature, fully oxidize the carbon element to generate carbon dioxide, improve the combustion efficiency, and shorten the detection time.

[0047] React the sample with oxygen at high temperature to completely oxidize the carbon in it to carbon dioxide. The generated carbon dioxide needs to be captured and converted into a form suitable for ICP analysis. Dissolve carbon dioxide in water to form carbonic acid, and then convert it into soluble bicarbonate or carbonate through acid-base titration or other chemical methods. React the carbonate or bicarbonate with a reagent that can react with carbon to generate a detectable element, and generate barium carbonate precipitate by reacting with barium ions. Dissolve the generated precipitate in nitric acid to form a solution of barium ions. Use ICP to analyze the barium ion concentration in the solution.

[0048] Since the amount of barium ions is directly related to the carbon content in the sample, the carbon content in the sample can be indirectly calculated by measuring the barium ion concentration. Calibrate using a standard sample with a known carbon content to establish a standard curve between barium ion concentration and carbon content. Calculate the carbon content in the sample according to the standard curve and the measured barium ion concentration.

[0049] In some embodiments, the specific operation steps are as follows: Example 1 Specific operation steps: S1: Preheat and preliminarily clean the graphite crucible. The specific steps for cleaning the residue are as follows: Wear personal protective equipment such as safety glasses and gloves to ensure safety during the operation. Use tools such as stainless steel tweezers, scrapers or shovels to gently scrape the solid residue accumulated in the graphite crucible. Note to avoid damaging the graphite crucible.

[0050] Soak the graphite crucible with a chemical solvent for chemical cleaning within a preset time. Among them, the cleaning agent: use dilute nitric acid (that is, 1 part of nitric acid is mixed with 4 parts of water, and the mass ratio is 1:4), which has a good dissolution effect on carbon-containing residues. Cleaning: Pour an appropriate amount of the cleaning agent into the graphite crucible, let it stand for 10 minutes, and then gently brush the inner wall and bottom of the crucible with a brush; pour out the cleaning agent.

[0051] The soaked graphite crucible is physically scoured by flushing with high-pressure water. The specific scouring operation: Use a high-pressure water gun or a rotary flushing device to physically scour the graphite crucible. Place the graphite crucible under the scouring device, turn on the scouring function, and conduct a comprehensive scour of the graphite crucible. After scouring, check the cleanliness of the graphite crucible. If there are still residues or stains, the physical scouring steps can be repeated.

[0052] S2: The rinsed graphite crucible is dried and white fused alumina is laid at the bottom of the graphite crucible. Specifically, after the crucible is scoured, 1 mm of white fused alumina is evenly laid at the bottom of the crucible to isolate the reaction materials from the inside of the crucible and reduce the corrosion of the materials on the crucible during the reaction.

[0053] S3: Vanadium pentoxide and aluminum pellets are placed in the graphite crucible for smelting to produce vanadium-aluminum alloy and sample to analyze the carbon content of the vanadium-aluminum alloy. For the vanadium-aluminum alloy smelted by the method of Example 1, samples are taken for analysis, and the carbon content in the alloy is 0.012%.

[0054] Example 2 Specific operation steps: S1: The graphite crucible is preheated and preliminarily cleaned. The specific steps for cleaning the residues are as follows: Wear personal protective equipment such as safety glasses and gloves to ensure safety during the operation. Use tools such as stainless steel tweezers, scrapers or shovels to gently scrape off the solid residues accumulated in the graphite crucible. Note to avoid damaging the graphite crucible.

[0055] Within a preset time, the graphite crucible is chemically cleaned by soaking it in a chemical solvent. Among them, the cleaning agent: dilute nitric acid is used (that is, 1 part of nitric acid is mixed with 5 parts of water, and the mass ratio is 1:5), which has a good dissolution effect on carbon-containing residues. Cleaning: Pour an appropriate amount of the cleaning agent into the graphite crucible, let it stand for 12 minutes, then gently brush the inner wall and bottom of the crucible with a brush; pour out the cleaning agent.

[0056] The soaked graphite crucible is physically scoured by flushing with high-pressure water. The specific scouring operation: Use a high-pressure water gun or a rotary flushing device to physically scour the graphite crucible. Place the graphite crucible under the scouring device, turn on the scouring function, and conduct a comprehensive scour of the graphite crucible. After scouring, check the cleanliness of the graphite crucible. If there are still residues or stains, the physical scouring steps can be repeated.

[0057] S2: The rinsed graphite crucible is dried and white fused alumina is laid at the bottom of the graphite crucible. Specifically, after the crucible is scoured, 2 mm of white fused alumina is evenly laid at the bottom of the crucible to isolate the reaction materials from the inside of the crucible and reduce the corrosion of the materials on the crucible during the reaction.

[0058] S3: Put vanadium pentoxide and aluminum pellets in a graphite crucible for smelting to produce a vanadium-aluminum alloy and sample to analyze the carbon content of the vanadium-aluminum alloy. For the vanadium-aluminum alloy smelted by the method of Example 2, sample and analyze, the carbon content in the alloy is 0.011%.

[0059] Example 3 Specific operation steps: S1: Conduct a preheating treatment on the graphite crucible and perform a preliminary cleaning. The specific steps for cleaning the residues are as follows: Wear personal protective equipment such as safety glasses and gloves to ensure safety during the operation. Use tools such as stainless steel tweezers, scrapers or shovels to gently scrape off the solid residues accumulated in the graphite crucible. Note to avoid damaging the graphite crucible.

[0060] Within a preset time, soak the graphite crucible with a chemical solvent for chemical cleaning. Among them, the cleaning agent: dilute nitric acid is used (that is, 1 part of nitric acid is mixed with 6 parts of water, and the mass ratio is 1:6), which has a good dissolving effect on carbon-containing residues. Cleaning: Pour an appropriate amount of the cleaning agent into the graphite crucible, let it stand for 15 minutes, and then gently brush the inner wall and bottom of the crucible with a brush; pour out the cleaning agent.

[0061] Physically scour the soaked graphite crucible with high-pressure water flow. The specific scouring operation: Use a high-pressure water gun or a rotating flushing device to physically scour the graphite crucible. Place the graphite crucible under the flushing device, turn on the flushing function, and comprehensively scour the graphite crucible. After scouring, check the cleanliness of the graphite crucible. If there are still residues or stains, the physical scouring steps can be repeated.

[0062] S2: Dry the rinsed graphite crucible and lay white corundum at the bottom of the graphite crucible. Specifically, after the crucible is scoured, evenly lay 3 mm of white corundum at the bottom of the crucible to isolate the reaction materials from the inside of the crucible and reduce the corrosion of the materials on the crucible during the reaction.

[0063] S3: Put vanadium pentoxide and aluminum pellets in a graphite crucible for smelting to produce a vanadium-aluminum alloy and sample to analyze the carbon content of the vanadium-aluminum alloy. For the vanadium-aluminum alloy smelted by the method of Example 3, sample and analyze, the carbon content in the alloy is 0.009%.

[0064] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0065] In addition, it should be noted that, for the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0066] In addition, any combinations can be made among the various different embodiments of the present invention, as long as they do not violate the idea of the present invention, and they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for controlling the carbon content of a vanadium-aluminum alloy, characterized in that, It includes the following steps: Preheat the graphite crucible, clean the residues on the inner surface layer of the graphite crucible, soak the graphite crucible with a chemical solvent within a preset time, and rinse the soaked graphite crucible with high-pressure water flow; Dry the rinsed graphite crucible and lay white corundum at the bottom of the graphite crucible; Put vanadium pentoxide and aluminum pellets into the graphite crucible for smelting to produce vanadium-aluminum alloy and sample to analyze the carbon content of the vanadium-aluminum alloy.

2. The method for controlling the carbon content of vanadium-aluminum alloy according to claim 1, wherein The chemical solvent includes dilute nitric acid.

3. The method for controlling the carbon content of vanadium-aluminum alloy according to claim 2, wherein The molar concentration range of the dilute nitric acid is 15%-20%.

4. The method for controlling the carbon content of the vanadium-aluminum alloy according to claim 1, wherein During the process of soaking the graphite crucible with the chemical solvent, it also includes adjusting the soaking temperature, wherein the range of the soaking temperature is 20-60°C.

5. The method for controlling the carbon content of the vanadium-aluminum alloy according to claim 1, characterized in that, The preset time is 10-15 minutes.

6. The method for controlling the carbon content of the vanadium-aluminum alloy according to claim 1, wherein, During the process of rinsing the soaked graphite crucible with high-pressure water flow, it also includes controlling the pressure of the water flow, wherein the water flow pressure range is 10~50 MPa.

7. The method for controlling the carbon content of vanadium-aluminum alloy according to claim 1, wherein The particle size range of the white corundum is 1-3mm.

8. The method for controlling the carbon content of vanadium-aluminum alloy according to claim 1, wherein By mass percentage, the carbon content range of the vanadium-aluminum alloy is less than or equal to 0.02%.

9. The method for controlling the carbon content of vanadium-aluminum alloy according to claim 1, wherein During the process of putting vanadium pentoxide and aluminum pellets into the graphite crucible for smelting, it also includes Adding less than 1 / 2 of the aluminum pellets and vanadium pentoxide into the graphite crucible to generate the initial phase of vanadium-aluminum alloy; When the reaction is stable, gradually add the remaining aluminum pellets and vanadium pentoxide; Continuously detect the gas pressure and introduce inert gas or reducing gas when the air pressure is lower than the preset value.

10. The method for controlling the carbon content of the vanadium-aluminum alloy according to claim 1, characterized in that, During the process of sampling and analyzing the carbon content of the vanadium-aluminum alloy, it also includes Sampling the vanadium-aluminum alloy to obtain a sample; Burning the sample in a high-temperature combustion furnace with an oxygen stream introduced to generate carbon dioxide; Absorbing the carbon dioxide with water and generating barium carbonate precipitate through acid-base titration and barium ions, and measuring the barium ion concentration after the dissolution of the barium carbonate precipitate by ICP; Calculating the carbon content in the sample according to the preset standard curve of barium ion concentration and carbon content.

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