Method for regulating material reaction rate to improve finished product rate of aluminum-tantalum intermediate alloy

Abstract

The application discloses a method for regulating material reaction rate to improve finished product rate of aluminum-tantalum intermediate alloy, and relates to the technical field of intermediate alloy materials. The specific steps comprise the following steps: mixing large-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain first-grade material; mixing medium-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain second-grade material; mixing small-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain third-grade material; sequentially adding the third-grade material, the second-grade material and the first-grade material into a reaction crucible, and insulating the materials by using porous aluminum foil, then performing aluminothermic reaction, and then performing gradient cooling to obtain aluminum-tantalum alloy without loose material. The reaction rate of the materials in the crucible gradually increases from top to bottom, the problems of poor slag-ingot separation and insufficient feeding caused by long formation of alloy liquid at the end of solidification and slow backflow are solved, the formation time of the alloy liquid in the later period is shortened, the backflow feeding is accelerated, the loose and stratification defects of the aluminum-tantalum alloy ingot are reduced, and the finished product rate is improved by more than 6%.

Description

Technical Field

[0001] This invention relates to the field of intermediate alloy materials technology, and in particular to a method for controlling the reaction rate of materials to improve the yield of aluminum-tantalum intermediate alloys. Background Technology

[0002] Aluminum-tantalum master alloys are crucial raw materials for smelting titanium alloys such as TA12A and TA29. Introducing tantalum into titanium alloys through aluminum-tantalum master alloys can solve problems such as uneven composition distribution and elemental segregation during the titanium alloy smelting process. As a non-eutectic alloy, aluminum-tantalum master alloys primarily crystallize via a paste-like solidification process. In the later stages of alloy ingot solidification, insufficient feeding of the alloy melt often leads to defects such as shrinkage porosity and delamination, resulting in a large amount of loose material in the aluminum-tantalum alloy ingot, causing significant losses and waste.

[0003] Besides being related to the alloy composition itself, the formation of shrinkage porosity is also closely related to the cooling rate and the degree of feeding of the alloy liquid. The higher the cooling rate, the greater the supercooling of the alloy liquid, and the easier it is for grains to nucleate, thus forming a large number of dendrites. If the gaps between dendrites cannot be fed by the alloy liquid in time, shrinkage porosity will form, eventually forming loose material and affecting the quality of alloy ingots.

[0004] Therefore, addressing the causes of porous material formation and providing a method for preparing aluminum-tantalum master alloys that can avoid the formation of porous material has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] In view of this, the present invention provides a method for improving the yield of aluminum-tantalum master alloy. By accelerating the reaction rate of the later materials and delaying the cooling rate of the later alloy liquid, the later alloy liquid can promote the feeding of the early solidification site, suppress the generation of shrinkage porosity and delamination defects, and thus reduce the porosity of aluminum-tantalum master alloy.

[0006] To achieve the above objectives, the present invention first provides a method for regulating the reaction rate of materials to improve the yield of aluminum-tantalum master alloy, characterized by comprising the following steps:

[0007] S1. Take large-particle tantalum pentoxide, medium-particle tantalum pentoxide, small-particle tantalum pentoxide, large-particle aluminum particles, medium-particle aluminum particles, small-particle aluminum particles, large-particle potassium chlorate, medium-particle potassium chlorate, and small-particle potassium chlorate, and dry them separately for later use. S2, large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate are mixed in a drum mixer and named as Grade 1 material; medium-particle tantalum pentoxide, medium-particle aluminum, and medium-particle potassium chlorate are mixed in a drum mixer and named as Grade 2 material; small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate are mixed in a drum mixer and named as Grade 3 material; S3, add the third-grade material to the reaction crucible and place a porous aluminum foil on the material; then add the second-grade material to the reaction crucible and place a porous aluminum foil on the material; finally add the first-grade material to the reaction crucible. S4. Place the igniter at the center of the surface of the first-grade material, connect the wire, close the vacuum furnace, replace the air with argon, and ignite to carry out the aluminothermic reaction. S5. After the reaction is complete, a vacuum is drawn and gradient cooling is performed simultaneously to obtain an aluminum-tantalum master alloy ingot.

[0008] Preferably, the difference in D50 between the large-particle tantalum pentoxide, medium-particle tantalum pentoxide, and small-particle tantalum pentoxide in step S1 is between 200 and 300 μm, and the D50 of the large-particle tantalum pentoxide is between 601 and 1000 μm. The difference in D50 between large-sized, medium-sized, and small-sized aluminum particles should be between 200 and 300 μm, and the D50 of large-sized aluminum particles should be between 601 and 1000 μm. The difference in D50 between the large-particle potassium chlorate, medium-particle potassium chlorate, and small-particle potassium chlorate should be between 200 and 300 μm, and the D50 of the large-particle potassium chlorate should be between 601 and 1000 μm.

[0009] Preferably, the drying temperature in step S1 is 120°C and the drying time is 6 hours.

[0010] Preferably, the mass ratio of large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate in step S2 is 5.2-5.4: 3.1-3.3: 1.3-1.5; The mass ratio of medium-sized tantalum pentoxide, medium-sized aluminum particles, and medium-sized potassium chlorate is 5.2-5.4: 3.1-3.3: 1.3-1.5. The mass ratio of the small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate is 5.2-5.4: 3.1-3.3: 1.3-1.5.

[0011] Preferably, the mixing time for each stage of materials in step S2 is 12 minutes.

[0012] Preferably, the reaction crucible in step S3 is a copper crucible; the copper crucible has independent cooling channels at the top and bottom for water cooling.

[0013] Preferably, the porous aluminum foil in step S3 has a mesh count of 16; the mass ratio of the grade 1 material, grade 2 material, and grade 3 material is 1:1:1.

[0014] Preferably, the igniter in step S4 is prepared by mixing potassium permanganate and aluminum powder in a mass ratio of 3:1, and the wire is an aluminum wire with a diameter of 1~3 mm, preferably 2 mm.

[0015] Preferably, the gradient cooling in step S5 specifically involves: after the reaction is completed, continuously supplying 80°C hot water to the upper cooling channel of the reaction crucible and continuously supplying room temperature water to the lower cooling channel of the reaction crucible for 30 minutes, then stopping the water supply and allowing it to cool naturally for 4-6 hours.

[0016] Finally, the present invention provides a method for preparing the above-mentioned aluminum-tantalum master alloy, wherein the composition of the aluminum-tantalum master alloy includes: Ta 72~76 wt%, with the balance being Al and unavoidable impurities.

[0017] This invention provides a method for controlling the reaction rate of materials to improve the yield of aluminum-tantalum master alloys. Compared with the prior art, it has the following advantages: (1) The one-step method for preparing aluminum-tantalum master alloy is simple, requires low equipment investment, and has a wide range of applications.

[0018] (2) During the aluminothermic reaction, the finer the particle size of the material, the faster the reaction rate and the shorter the time for the alloy liquid to form. This invention classifies all materials by particle size before the aluminothermic reaction, so that each raw material is arranged in a gradient from large to small particle size in the crucible from top to bottom, thereby controlling the reaction rate. The reaction rate of the material in the crucible is accelerated from top to bottom, which shortens the replacement time of the subsequent alloy liquid, accelerates the rapid reflux of the subsequent alloy liquid, and reduces defects such as poor slag-ingot separation, stratification, and shrinkage cavities caused by untimely reflux of the alloy liquid at the end of solidification. This reduces the porosity of the aluminum-tantalum master alloy and improves the yield of the aluminum-tantalum master alloy.

[0019] (3) By preparing aluminum-tantalum master alloy through the present invention, the porosity and delamination defects on the top of the alloy ingot are significantly reduced, and the final yield is increased by more than 6%. Attached Figure Description

[0020] 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 will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 Cross-sections of the final solidification location at the center of different alloy ingots. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention reduces defects such as shrinkage and delamination during the solidification process of alloy ingots by controlling the gradient reaction rate of materials during the aluminothermic reaction, thereby reducing loose material and improving the yield of aluminum-tantalum master alloy.

[0024] Example 1 A method for improving the yield of aluminum-tantalum master alloy produced by vacuum aluminothermic process includes the following steps: S1. Take 18.7 kg of large-particle tantalum pentoxide with a D50 of 656.3 μm, 18.7 kg of medium-particle tantalum pentoxide with a D50 of 396.3 μm, 18.7 kg of small-particle tantalum pentoxide with a D50 of 166.3 μm, 11.3 kg of large-particle aluminum particles with a D50 of 863.4 μm, 11.3 kg of medium-particle aluminum particles with a D50 of 632.6 μm, 11.3 kg of small-particle aluminum particles with a D50 of 410.3 μm, 5 kg of large-particle potassium chlorate with a D50 of 630.2 μm, 5 kg of medium-particle potassium chlorate with a D50 of 429.2 μm, and 5 kg of small-particle potassium chlorate with a D50 of 189.2 μm, and dry them in different drying kilns for 6 hours at a drying temperature of 120℃.

[0025] S2, mix large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 1 material; mix medium-particle tantalum pentoxide, medium-particle aluminum, and medium-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 2 material; mix small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 3 material.

[0026] S3, add the grade 3 material into a copper reaction crucible with cooling channels inside the wall, and place a porous aluminum foil on the material; then add the grade 2 material into the reaction crucible, and place a porous aluminum foil on the material; finally add the grade 1 material into the reaction crucible; the porous aluminum foil has a mesh size of 16.

[0027] S4. Weigh 15 g of potassium permanganate and 5 g of aluminum granules, mix them well as igniters, place them in the center of the surface of the first-grade material, and connect them with a 2 mm diameter aluminum wire as a guide. Close the vacuum furnace, evacuate the vacuum, and when the vacuum degree is <50 Pa, open the gas inlet valve to purge argon gas. After the argon purging is complete, ignite to carry out the aluminothermic reaction.

[0028] S5. After the reaction is complete, vacuum is applied again. At the same time, 80°C hot water is introduced into the upper cooling channel of the crucible, and room temperature water is introduced into the lower cooling channel of the crucible. After 30 minutes, the vacuum is turned off, and the crucible is allowed to cool naturally for 6 hours before being removed from the furnace to obtain an aluminum-tantalum master alloy ingot.

[0029] Example 2 A method for improving the yield of aluminum-tantalum master alloy produced by vacuum aluminothermic process includes the following steps: S1. Take 18.7 kg of large-particle tantalum pentoxide with a D50 of 603.1 μm, 18.7 kg of medium-particle tantalum pentoxide with a D50 of 312.6 μm, 18.7 kg of small-particle tantalum pentoxide with a D50 of 22.6 μm, 11.3 kg of large-particle aluminum particles with a D50 of 608.5 μm, 11.3 kg of medium-particle aluminum particles with a D50 of 388.2 μm, 11.3 kg of small-particle aluminum particles with a D50 of 157.7 μm, 5 kg of large-particle potassium chlorate with a D50 of 669.8 μm, 5 kg of medium-particle potassium chlorate with a D50 of 404.5 μm, and 5 kg of small-particle potassium chlorate with a D50 of 114.2 μm, and dry them in different drying kilns for 6 hours at a drying temperature of 120℃.

[0030] S2, mix large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 1 material; mix medium-particle tantalum pentoxide, medium-particle aluminum, and medium-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 2 material; mix small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 3 material.

[0031] S3, add the grade 3 material into a copper reaction crucible with cooling channels inside the wall, and place a porous aluminum foil on the material; then add the grade 2 material into the reaction crucible, and place a porous aluminum foil on the material; finally add the grade 1 material into the reaction crucible, wherein the porous aluminum foil has a mesh size of 16.

[0032] S4. Weigh 15 g of potassium permanganate and 5 g of aluminum granules, mix them well as igniters, place them in the center of the surface of the first-grade material, and connect them with a 2 mm diameter aluminum wire as a guide. Close the vacuum furnace, evacuate the vacuum, and when the vacuum degree is <50 Pa, open the gas inlet valve to purge argon gas. After the argon purging is complete, ignite to carry out the aluminothermic reaction.

[0033] S5. After the reaction is complete, vacuum is applied again. At the same time, 80°C hot water is introduced into the upper cooling channel of the crucible, and room temperature water is introduced into the lower cooling channel of the crucible. After 30 minutes, the vacuum is turned off, and the crucible is allowed to cool naturally for 6 hours before being removed from the furnace to obtain an aluminum-tantalum master alloy ingot.

[0034] Comparative Example 1 A method for producing aluminum-tantalum master alloy by vacuum aluminothermic process includes the following steps: The difference from Example 1 is that all reactions were carried out using large-particle tantalum pentoxide, large-particle aluminum particles, and large-particle potassium chlorate.

[0035] S1. Take 56.1 kg of large-particle tantalum pentoxide with a D50 of 656.3 μm, 33.9 kg of large-particle aluminum with a D50 of 863.4 μm, and 15 kg of large-particle potassium chlorate with a D50 of 630.2 μm, and dry them in different drying kilns for 6 hours at a drying temperature of 120℃.

[0036] S2, mix large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate in a drum mixer for 12 minutes, and name the resulting mixture as Grade 1 material.

[0037] S3, add the grade 1 material into a copper reaction crucible with cooling channels inside the wall.

[0038] S4. Weigh 15 g of potassium permanganate and 5 g of aluminum granules, mix them well as igniters, place them in the center of the surface of the first-grade material, and connect them with a 2 mm diameter aluminum wire as a guide. Close the vacuum furnace, evacuate the vacuum, and when the vacuum degree is <50 Pa, open the gas inlet valve to purge argon gas. After the argon purging is complete, ignite to carry out the aluminothermic reaction.

[0039] S5. After the reaction is complete, vacuum is applied again. At the same time, 80°C hot water is introduced into the upper cooling channel of the crucible, and room temperature water is introduced into the lower cooling channel of the crucible. After 30 minutes, the vacuum is turned off, and the crucible is allowed to cool naturally for 6 hours before being removed from the furnace to obtain an aluminum-tantalum master alloy ingot.

[0040] Comparative Example 2 A method for producing aluminum-tantalum master alloy by vacuum aluminothermic process includes the following steps: The difference from Example 1 is that all reactions are carried out using small-particle tantalum pentoxide, small-particle aluminum particles, and small-particle potassium chlorate.

[0041] S1, 56.1 kg of tantalum pentoxide with a D50 of 166.3 μm, 33.9 kg of aluminum particles with a D50 of 410.3 μm, and 15 kg of potassium chlorate with a D50 of 189.2 μm were dried in different drying kilns for 6 hours at a drying temperature of 120℃.

[0042] S2, small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate are mixed in a drum mixer for 12 minutes, and the resulting mixture is named Grade 3 material.

[0043] S3, add the grade 3 material into a copper reaction crucible with cooling channels inside the wall.

[0044] S4. Weigh 15 g of potassium permanganate and 5 g of aluminum granules, mix them well as igniters, place them in the center of the surface of the grade 3 material, and connect them with a 2 mm diameter aluminum wire as a guide. Close the vacuum furnace, evacuate the vacuum, and when the vacuum degree is <50 Pa, open the gas inlet valve to purge argon gas. After the argon purging is complete, ignite the aluminothermic reaction.

[0045] S5. After the reaction is complete, vacuum is applied again. At the same time, 80°C hot water is introduced into the upper cooling channel of the crucible, and room temperature water is introduced into the lower cooling channel of the crucible. After 30 minutes, the vacuum is turned off, and the crucible is allowed to cool naturally for 6 hours before being removed from the furnace to obtain an aluminum-tantalum master alloy ingot.

[0046] Comparative Example 3 A method for producing aluminum-tantalum master alloy by vacuum aluminothermic process includes the following steps: The difference from Example 1 is that no gradient gradation arrangement is performed, and products of different particle sizes are all mixed uniformly.

[0047] S1. Take 18.7 kg of large-particle tantalum pentoxide with a D50 of 656.3 μm, 18.7 kg of medium-particle tantalum pentoxide with a D50 of 396.3 μm, 18.7 kg of small-particle tantalum pentoxide with a D50 of 166.3 μm, 11.3 kg of large-particle aluminum particles with a D50 of 863.4 μm, 11.3 kg of medium-particle aluminum particles with a D50 of 636.2 μm, 11.3 kg of small-particle aluminum particles with a D50 of 410.3 μm, 5 kg of large-particle potassium chlorate with a D50 of 630.2 μm, 5 kg of medium-particle potassium chlorate with a D50 of 429.2 μm, and 5 kg of small-particle potassium chlorate with a D50 of 189.2 μm, and dry them in different drying kilns for 6 hours at a drying temperature of 120℃.

[0048] S2, mix all materials evenly for 12 minutes to obtain a mixed material.

[0049] S3, add the mixture into a copper reaction crucible with cooling channels inside the wall.

[0050] S4. Weigh 15 g of potassium permanganate and 5 g of aluminum granules, mix them well as igniters, place them in the center of the mixing surface, and connect them with an aluminum wire with a diameter of 2 mm as a guide wire. Close the vacuum furnace, evacuate the vacuum, and when the vacuum degree is <50 Pa, open the gas inlet valve to purge argon gas. After the argon purging is complete, ignite to carry out the aluminothermic reaction.

[0051] S5. After the reaction is complete, vacuum is applied again. At the same time, 80°C hot water is introduced into the upper cooling channel of the crucible, and room temperature water is introduced into the lower cooling channel of the crucible. After 30 minutes, the vacuum is turned off, and the crucible is allowed to cool naturally for 6 hours before being removed from the furnace to obtain an aluminum-tantalum master alloy ingot.

[0052] Performance testing Figure 1 The cross-sections of the final solidification positions at the center of different alloy ingots, as shown in the figure, demonstrate that gradient reaction rate control of the material can significantly reduce the formation of defects such as loose material and delamination in the alloy ingot. Comparative Examples 1 and 3 show that when using only Grade 1 material or without gradient material distribution, delamination occurs at the top of the alloy ingot, with a large number of alloy inclusions in the upper layer. This is due to the slow reaction rate of the material, where the alloy has already solidified and formed a bridging shell in the early stages, while the remaining material is still reacting in the later stages, resulting in a longer reflux time for the alloy liquid. Comparative Example 2 shows that when using only Grade 3 material, the delamination phenomenon of the alloy ingot is alleviated, but the top of the resulting alloy ingot has dense shrinkage cavities, indicating poor feeding at the end of solidification. Furthermore, the alloy ingot weight obtained using Grade 3 material is lower, which is due to the more intense aluminothermic reaction throughout the entire process when using only Grade 3 material, resulting in greater smelting losses.

[0053] The aluminum-tantalum alloy ingots of Examples 1, 2, 1, 2, and 3 were sandblasted and crushed to less than 3 mm using a jaw crusher to remove the alloy containing inclusions. The finished product weight and yield of each alloy ingot are shown in Table 1. The theoretical ingot weight is calculated based on the batching, and the yield is the ratio of the finished product weight to the theoretical ingot weight.

[0054] Table 1

[0055] As shown in Table 1, the method of preparing aluminum-tantalum master alloy can significantly reduce the porosity and delamination defects at the top of the alloy ingot, thereby increasing the final yield of aluminum-tantalum alloy by more than 6%.

[0056] Component testing Table 2

[0057] As shown in Table 2, the alloy composition obtained in the examples is close to that in the comparative examples, indicating that gradient fabric does not change the composition of the alloy.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for regulating the reaction rate of materials to improve the yield of aluminum-tantalum master alloy products, characterized in that, Includes the following steps: S1. Take large-particle tantalum pentoxide, medium-particle tantalum pentoxide, small-particle tantalum pentoxide, large-particle aluminum particles, medium-particle aluminum particles, small-particle aluminum particles, large-particle potassium chlorate, medium-particle potassium chlorate, and small-particle potassium chlorate, and dry them separately for later use. S2, large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate are mixed in a drum mixer and named as Grade 1 material; medium-particle tantalum pentoxide, medium-particle aluminum, and medium-particle potassium chlorate are mixed in a drum mixer and named as Grade 2 material; small-particle tantalum pentoxide, small-particle aluminum, and small-particle potassium chlorate are mixed in a drum mixer and named as Grade 3 material; S3, add the third-grade material to the reaction crucible and place a porous aluminum foil on the material; then add the second-grade material to the reaction crucible and place a porous aluminum foil on the material; finally add the first-grade material to the reaction crucible. S4. Place the igniter at the center of the surface of the first-grade material, connect the wire, close the vacuum furnace, replace the air with argon, and ignite to carry out the aluminothermic reaction. S5. After the reaction is complete, a vacuum is drawn and gradient cooling is performed simultaneously to obtain an aluminum-tantalum master alloy ingot.

2. The method according to claim 1, characterized in that, In step S1, the difference in D50 between large-particle tantalum pentoxide, medium-particle tantalum pentoxide, and small-particle tantalum pentoxide should be between 200 and 300 μm, and the D50 of large-particle tantalum pentoxide should be between 601 and 1000 μm. The difference in D50 between large-sized, medium-sized, and small-sized aluminum particles should be between 200 and 300 μm, and the D50 of large-sized aluminum particles should be between 601 and 1000 μm. The difference in D50 between the large-particle potassium chlorate, medium-particle potassium chlorate, and small-particle potassium chlorate should be between 200 and 300 μm, and the D50 of the large-particle potassium chlorate should be between 601 and 1000 μm.

3. The method according to claim 1, characterized in that, The drying temperature in step S1 is 120°C and the drying time is 6 hours.

4. The method according to claim 1, characterized in that, In step S2, the mass ratio of large-particle tantalum pentoxide, large-particle aluminum, and large-particle potassium chlorate in the grade 1 material is 5.2-5.4:3.1-3.3:1.3-1.

5. In the second-grade material, the mass ratio of medium-sized tantalum pentoxide, medium-sized aluminum particles, and medium-sized potassium chlorate is 5.2-5.4:3.1-3.3:1.3-1.

5. In the aforementioned grade 3 materials, the mass ratio of small-particle tantalum pentoxide, small-particle aluminum particles, and small-particle potassium chlorate is 5.2-5.4:3.1-3.3:1.3-1.

5.

5. The method according to claim 1, characterized in that, The mixing time for each stage of materials in step S2 is 12 minutes.

6. The method according to claim 1, characterized in that, The reaction crucible mentioned in step S3 is a copper crucible; the upper and lower parts of the copper crucible are independently equipped with cooling channels for water cooling.

7. The method according to claim 1, characterized in that, The porous aluminum foil in step S3 has a mesh count of 16; the mass ratio of the grade 1 material, grade 2 material, and grade 3 material is 1:1:

1.

8. The method according to claim 1, characterized in that, The igniter in step S4 is prepared by mixing potassium permanganate and aluminum powder in a mass ratio of 3:1, and the conductor is an aluminum wire.

9. The method according to claim 1, characterized in that, The gradient cooling described in step S5 is as follows: After the reaction is completed, hot water at 80°C is continuously introduced into the upper cooling channel of the reaction crucible, and room temperature water is continuously introduced into the lower cooling channel of the reaction crucible. The mixture is cooled for 30 minutes, and then the water supply is stopped, and the mixture is allowed to cool naturally for 4-6 hours.

10. An aluminum-tantalum master alloy prepared by the method according to any one of claims 1 to 9, characterized in that, The composition of the aluminum-tantalum master alloy includes: Ta 72~76wt%, with the balance being Al and unavoidable impurities.

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