A method for preparing an al-ti-b refiner pipe based on mechanical vibration and an adding method thereof

Abstract

The application relates to a method for preparing Al-Ti-B refining agent pipe based on mechanical vibration and an adding method thereof, and relates to the technical field of grain refiner preparation and application. The application aims to solve the problems of TiB2 sinking, TiB2 agglomeration, uneven distribution of TiB2 in the existing aluminum alloy refining agent, existence of inclusion oxides and salt attachments in the aluminum alloy structure after adding the refining agent, high oxygen content, low refining nucleation rate, large supercooling degree and low performance of the aluminum alloy product. The application can effectively reduce the inclusion oxides and salt attachments in the refining agent, reduce the oxygen content, reduce the hole defects and reduce the nucleation supercooling degree through mechanical vibration. The adding method combines the adding of the refining agent and aluminum alloy refining degassing (argon degassing), and the adding method is to utilize the argon degassing of the refining agent pipe to the aluminum liquid, reduce the internal hole defects of the casting, and improve the mechanical performance and wear resistance of the product. The application is suitable for industrial production.

Description

Technical Field

[0001] This invention relates to the field of grain refiner preparation and application technology, specifically to a method for preparing Al-Ti-B grain refiner pipes based on mechanical vibration and the method of adding the refiner. Background Technology

[0002] In the context of lightweighting, aluminum alloys, due to their advantages such as low density, high specific strength, high toughness, and recyclability, have been widely used in transportation, aerospace, and electronics. The ingot structure of aluminum alloys is generally coarse, resulting in lower performance; grain refinement is necessary to improve product performance. Current methods for grain refinement include rapid solidification, deformation, stirring, vibration and ultrasonic treatment, grain refinement treatment, and modification treatment.

[0003] Ultrasonic treatment requires coordination with stirring due to its small effective area. However, the stirring process of molten metal easily entraps gas, leading to porosity defects in the subsequent alloy, thus limiting its application. During the smelting process, hydrogen from the air easily diffuses into the molten aluminum alloy, so degassing is usually required before casting. Argon passing through molten aluminum alloy is a common degassing method. Argon refining is based on the small bubble theory, using fine, dispersed argon bubbles to purify the molten aluminum, remove hydrogen and inclusions, eliminate pinhole defects, and ensure mechanical properties.

[0004] Al-Ti-B refining agents are common refining agents for aluminum alloys. They are typically produced by adding salts of different compositions to molten aluminum, undergoing an alloying reaction, and then continuously casting and extruding after slag removal. During the production of Al-Ti-B refining agents, the salt reaction generates a large amount of slag. Simultaneously, the generated TiB2 has a high density, easily precipitates, and tends to agglomerate. These agglomerated TiB2 clusters become stress concentration points during subsequent use, easily inducing microcracks. This leads to deterioration of the material's performance under stress, causing premature breakage of parts.

[0005] In aluminum alloys, the vast majority of oxygen exists as alumina inclusions. These inclusions have a significant negative impact on the mechanical and machinability of the material, and are strictly limited, especially in industrial applications. On the one hand, excessive oxygen content in aluminum alloy products reduces mechanical properties; in particular, alumina inclusions significantly reduce plasticity (elongation) and strength, and are also a potential source of fatigue cracks. On the other hand, excessive oxygen content in aluminum alloy products can lead to more defects inside castings, and may even reduce corrosion resistance and affect surface quality. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of TiB2 sinking, TiB2 agglomeration, uneven distribution of TiB2 in existing aluminum alloy refining agents, inclusions of oxides and salts in the aluminum alloy microstructure after adding the refining agent, high oxygen content, low refining nucleation rate, large undercooling, and low performance of aluminum alloy products. The invention provides a method for preparing Al-Ti-B refining agent tubing based on mechanical vibration and the method of adding the refining agent.

[0007] A method for preparing Al-Ti-B refining agent pipes based on mechanical vibration is specifically carried out according to the following steps:

[0008] 1. Heat aluminum ingots to 700℃~750℃ and melt them to obtain molten aluminum; introduce argon gas into the molten aluminum to degas and remove slag, then add a mixture of KBF4 and K2TiF6, and then alloy it under the action of stirring in a medium-frequency electromagnetic field at a temperature of 700-750℃ to obtain Al-Ti-B melt.

[0009] 2. Sprinkle light calcium carbonate evenly on the surface of Al-Ti-B melt, remove the residual liquid and skim off the slag to obtain Al-Ti-B melt;

[0010] 3. Adjust the temperature of the Al-Ti-B melt to 750℃~900℃, then transfer the melt into the casting furnace through the trough. Use argon gas to refine and degas the melt. At the same time as degassing, turn on the mechanical vibration system to mechanically vibrate the melt. After the vibration is finished, let it stand still and remove the surface slag to obtain the mechanically vibrated Al-Ti-B melt.

[0011] 4. The mechanically vibrated Al-Ti-B melt is cast into ingots and extruded into pipes to obtain Al-Ti-B refining agent pipes.

[0012] Al-Ti-B grain refiner tubing is used for grain refinement of aluminum alloys.

[0013] The purpose and principle of this invention:

[0014] One of the objectives of this invention is to provide a novel method for preparing Al-Ti-B refining agents, which has advantages such as reducing scum, reducing oxide and salt deposits inside the refining agent, and eliminating melt gas content.

[0015] The second objective of this invention is to provide a novel method for preparing an Al-Ti-B refining agent. This method provides mechanical vibration, and the direction of the mechanical vibration is one or both of the X and Y directions. This avoids the sinking of TiAl3 and TiB2, helps to eliminate the agglomeration of TiB2 particles, facilitates the coating of TiB2 by TiAl3, increases the number of nucleation particles in the refining agent, improves the refining nucleation rate, and reduces the nucleation undercooling.

[0016] The third objective of this invention is to provide a novel method for adding Al-Ti-B refining agent. Specifically, when adding the refining agent, argon is passed through the pipe to remove gas. The numerous small argon bubbles envelop the refining agent from the inside out. At this time, the bubbles rise and disperse the TiB2 particles, which is most effective in preventing the TiB2 particles from settling to the bottom, thus achieving the best refining effect.

[0017] The fourth objective of this invention is to provide a novel method for adding Al-Ti-B grain refiner. By using a tube-shaped material for the grain refiner to pass through argon gas for degassing, the area of ​​the aluminum melt surrounding the grain refiner is larger, the grain refiner melts more rapidly, the melting time of the grain refiner is shortened, and the production efficiency is improved. At the same time, the argon gas lowers the temperature of the aluminum melt, making it easier for solute atoms in the high-temperature zone to move to the low-temperature zone, which is beneficial for the dispersion of the grain refiner solute and further for grain refinement, resulting in a better grain size refinement effect.

[0018] The fifth objective of this invention is to provide a novel method for adding Al-Ti-B refining agent. In this invention, while adding the refining agent, argon is passed through the refining agent in the form of a tube for degassing, resulting in better degassing effect. This facilitates the flotation of salt oxides in the refining agent, which helps to reduce inclusions of oxides, pores, or voids. The process is simple and convenient.

[0019] The sixth objective of this invention is to provide a novel method for adding Al-Ti-B refining agent. This invention combines the addition of refining agent with aluminum alloy refining and degassing (argon degassing), which is beneficial for obtaining aluminum alloy products with high strength and high wear resistance.

[0020] This invention has significant advantages over existing technologies:

[0021] 1. The mechanical vibration provided by this invention, wherein the direction of the mechanical vibration is X and / or Y, is beneficial to scum, to reducing oxides and salt deposits inside the refining agent, and to eliminating the content of gas in the melt;

[0022] Second, the mechanical vibration provided by this invention, and the direction of the mechanical vibration is X and / or Y, avoids the sinking of TiAl3 and TiB2, which is beneficial to eliminate the agglomeration of TiB2 particles, facilitates the coating of TiB2 by TiAl3, increases the number of nucleation particles in the refiner, improves the nucleation rate, reduces the undercooling of nucleation, and enables the refiner to have high refining ability.

[0023] Third, the Al-Ti-B refining agent product provided by this invention is a tube. When the Al-Ti-B refining agent tube is added to the aluminum melt, the aluminum melt covers a larger area of ​​the refining agent, the refining agent melts more quickly, the refining agent melting time is shortened, and the production efficiency is improved.

[0024] Fourth, the Al-Ti-B refining agent provided by this invention is for pipes, which avoids the addition of refining agent in too concentrated a concentration and avoids uneven refining effect;

[0025] V. The Al-Ti-B refining agent tubing provided by this invention achieves the best coating effect of the refining agent by first passing argon through it, minimizing the impact of adding the refining agent on the aluminum melt by introducing air and oxides, and thus minimizing the oxygen content in the product.

[0026] VI. The Al-Ti-B refining agent tube provided by this invention allows for the introduction of argon to the molten aluminum for degassing, thereby reducing internal porosity defects in castings and improving product quality.

[0027] VII. In this invention, while adding Al-Ti-B refining agent to the pipe, the refining agent is used to degas the pipe by passing argon. The numerous small argon bubbles envelop the refining agent from the inside out. At this time, the bubbles rise and carry TiB2 particles to disperse, which is the best way to prevent TiB2 particles from sinking to the bottom. Therefore, the refining effect is the best.

[0028] 8. In addition to adding a grain refiner, the present invention utilizes the form of a tube to pass argon gas for degassing. The argon gas lowers the temperature of the aluminum liquid, and the grain refiner melts in the low-temperature aluminum liquid. The lower temperature and lower supercooling are more conducive to grain refinement.

[0029] 9. In addition to the finer agent, the present invention utilizes the finer agent in the form of a tube to pass argon for degassing. The small argon bubbles lower the temperature of the aluminum liquid. There are high temperature and low temperature zones in the aluminum liquid. The solute in the high temperature zone is more likely to move to the solute atoms in the low temperature zone, which is beneficial to the dispersion of the finer agent solute.

[0030] 10. In addition to the refining agent, the present invention utilizes the refining agent in the form of a tube to pass argon for degassing, which facilitates the floating of salt oxides in the refining agent. If the refining agent is in the form of a rod, and argon is passed next to the refining agent for degassing, after adding the rod refining agent, the salt oxides will sink rapidly, and the argon bubbles will not have time to float up and carry away the salt oxides.

[0031] XI. This invention adds a refining agent while combining the addition of the refining agent with aluminum alloy refining and degassing (argon degassing). This process is simple and convenient, shortens the time of traditional processes, and the combination of the two makes the refining effect optimal.

[0032] 12. In this invention, while adding the refining agent, argon is introduced through the refining agent tube for degassing. When the refining agent is added by swinging left and right, there is no need to consider the situation where the argon degassing cannot keep up. If the argon degassing is done by a separate device, it is easy to fail to keep up with the swing of the refining agent, which may cause the swing of the refining agent to damage the surface of the aluminum alloy liquid, introduce air, and result in inclusions of oxides or pore defects.

[0033] Thirteen, after adding the refining agent, the method of combining the addition of the refining agent with aluminum alloy refining and degassing (argon degassing) makes the aluminum alloy product stronger and more wear-resistant.

[0034] This invention is applicable to industrial production. Attached Figure Description

[0035] Figure 1 Comparison of optical microstructure morphology of Al-4.5Cu-1.5Mg alloy after adding AlTi5B1 refining agent for Examples 1, 2, 3, and 4: (a) Example 1, (b) Example 2, (c) Example 3, and (d) Example 4;

[0036] Figure 2 The cooling curves of Al-4.5Cu-1.5Mg alloy after adding AlTi5B1 refining agent are shown in Examples 1, 2, 3 and 4. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Those skilled in the art should understand that the embodiments described are merely for the purpose of aiding understanding of this invention and should not be considered as specific limitations on this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Process parameters in the following embodiments that are not specifically specified are generally performed under conventional conditions.

[0038] Specific Implementation Method 1: This implementation method is a method for preparing Al-Ti-B refining agent pipes based on mechanical vibration, specifically completed according to the following steps:

[0039] 1. Heat aluminum ingots to 700℃~750℃ and melt them to obtain molten aluminum; introduce argon gas into the molten aluminum to degas and remove slag, then add a mixture of KBF4 and K2TiF6, and then alloy it under the action of stirring in a medium-frequency electromagnetic field at a temperature of 700-750℃ to obtain Al-Ti-B melt.

[0040] 2. Sprinkle light calcium carbonate evenly on the surface of Al-Ti-B melt, remove the residual liquid and skim off the slag to obtain Al-Ti-B melt;

[0041] 3. Adjust the temperature of the Al-Ti-B melt to 750℃~900℃, then transfer the melt into the casting furnace through the trough. Use argon gas to refine and degas the melt. At the same time as degassing, turn on the mechanical vibration system to mechanically vibrate the melt. After the vibration is finished, let it stand still and remove the surface slag to obtain the mechanically vibrated Al-Ti-B melt.

[0042] 4. The mechanically vibrated Al-Ti-B melt is cast into ingots and extruded into pipes to obtain Al-Ti-B refining agent pipes.

[0043] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the time for introducing argon gas into the molten aluminum for degassing in step one is 5 to 15 minutes, the pressure of the argon gas is 0.1 MPa to 0.5 MPa, and the purity of the argon gas is high-purity argon gas. Other steps are the same as in Specific Implementation Method One.

[0044] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the mass ratio of aluminum ingot, KBF4, and K2TiF6 in step one is (6~11):(1~3):(2~5). The other steps are the same as in Specific Implementation Method One or Two.

[0045] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that: in step one, the mixture of KBF4 and K2TiF6 is added in stages, and the total feeding time of the mixture of KBF4 and K2TiF6 is 5 min to 30 min; the alloying time in step one is 10 min to 60 min. Other steps are the same as in Specific Implementation Methods One to Three.

[0046] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the composition of the Al-Ti-B melt mentioned in step one is Al-Ti5-B1 ​​or Al-Ti3-B1. The other steps are the same as in Specific Implementation Methods One to Four.

[0047] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that: the static time mentioned in step three is 10-30 minutes; the mechanical vibration time mentioned in step three is 5-30 seconds; the frequency of the mechanical vibration is 50 Hz; the direction of the mechanical vibration is the X and / or Y direction; and the amplitude of the mechanical vibration is 1 mm. Other steps are the same as in Specific Implementation Methods One to Five.

[0048] Specific Implementation Method Seven: The difference between this implementation method and Specific Implementation Methods One to Six is ​​that the inner diameter of the Al-Ti-B refining agent tube mentioned in step four is 5mm to 10mm, and the wall thickness of the tube is 1mm to 2mm. The other steps are the same as in Specific Implementation Methods One to Six.

[0049] Specific Implementation Method 8: This implementation method is the use of Al-Ti-B grain refiner tubing for grain refinement of aluminum alloys.

[0050] Specific Implementation Method Nine: This implementation method involves using Al-Ti-B grain refiner tubing for grain refinement of aluminum alloys, specifically completed according to the following steps:

[0051] I. Smelting:

[0052] The aluminum alloy to be refined is heated and melted to obtain the aluminum alloy melt.

[0053] 2. Argon gas is introduced into the cavity of the Al-Ti-B refining agent tube, and then the Al-Ti-B refining agent tube is inserted into the aluminum alloy melt to be refined. After the Al-Ti-B refining agent tube is completely melted, the argon gas is stopped, the mixture is stirred for 5 seconds, and then allowed to stand for 10 to 20 minutes to obtain the aluminum alloy with refined grains.

[0054] The mass of the Al-Ti-B refining agent tubing mentioned in step two is 0.1% to 1% of the mass of the aluminum alloy to be refined;

[0055] The pressure of the argon gas mentioned in step two is 0.1MPa~0.5MPa, and the time for introducing the argon gas is the same as the time for adding the Al-Ti-B refining agent to the tubing.

[0056] III. Pouring:

[0057] The refined aluminum alloy is poured into a mold and cooled to obtain a grain-refined casting. Other steps are the same as in specific embodiments one through eight.

[0058] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One to Nine in that: the aluminum alloy to be refined in step one is Al-4.5Cu-1.5Mg, and the heating and melting temperature is 740℃~780℃; in step two, argon gas is introduced into the cavity of the Al-Ti-B refining agent tube, and then the Al-Ti-B refining agent tube is inserted into the molten aluminum alloy to be refined at a temperature of 740℃~780℃. The other steps are the same as in Specific Implementation Methods One to Nine.

[0059] The beneficial effects of the present invention are verified using the following embodiments:

[0060] Example 1: Preparation and addition method of a novel Al-Ti-B refining agent, specifically completed according to the following steps:

[0061] 1. Melt 120 kg of aluminum ingot (99.7% purity) in a medium-frequency induction furnace. Heat the aluminum liquid to 750°C and degas the aluminum liquid with argon for 10 minutes. Remove slag. Then add a mixture of KBF4 and K2TiF6 obtained by mixing 20 kg of KBF4 (98% purity) and 40 kg of K2TiF6 (98% purity) into the aluminum liquid. Use a one-time feeding method. Stir the melt continuously during feeding. The feeding time is 10 minutes.

[0062] 2. Alloying is carried out at an aluminum melt temperature of 900℃ for 60 minutes. After the feeding is completed, the aluminum melt is subjected to mechanical vibration in the X direction for 30 seconds with a vibration frequency of 50Hz and an amplitude of 1mm. Then, light calcium carbonate is evenly sprinkled on the surface of the melt for 7mm, and residual water slag is removed to obtain Al-Ti-B melt.

[0063] 3. Adjust the temperature of Al-Ti-B melt to 750℃. Transfer the Al-Ti-B melt into the casting furnace through the trough. First, use argon gas to refine and degas the aluminum melt in the casting furnace for 10 minutes. After degassing, let it stand for 5 minutes to remove the surface slag and obtain the Al-Ti-B melt after mechanical vibration treatment.

[0064] IV. The Al-Ti-B melt after mechanical vibration treatment is fed into the continuous casting and rolling mill through a chute at 750℃ to produce AlTi5B1 alloy pipes with an outer diameter of 12mm and an inner diameter of 3mm, thus obtaining AlTi5B1 refining agent pipes.

[0065] 5. Using a 5kW graphite crucible resistance furnace, 5kg of Al-4.5Cu-1.5Mg alloy was melted at a temperature of 740℃. After the alloy melted, the cavity of the AlTi5B1 refining agent tube was connected to an argon cylinder with an argon pressure of 0.1MPa. High-purity argon was introduced, followed by the addition of 15g of the AlTi5B1 refining agent tube prepared in step 4. The argon introduction time was the same as the addition time of the Al-Ti-B refining agent tube, which was 15s. The mixture was stirred for 5s, allowed to stand for 10min, and then the refined aluminum liquid was poured into a mold. After cooling, a casting with refined grains was obtained.

[0066] Example 2: The difference between this example and Example 1 is that ultrasonic treatment is used in step two. Specifically, alloying is carried out for 60 minutes at an aluminum melt temperature of 900℃. After the addition of materials, the aluminum melt is ultrasonically treated for 30 seconds at an ultrasonic frequency of 20Hz. Then, light calcium carbonate is evenly sprinkled on the surface of the melt to a thickness of 7mm, and residual slag is removed to obtain Al-Ti-B melt. Other steps and parameters are the same as in Example 1.

[0067] Example 3: The difference between this example and Example 1 is that high-purity argon gas is not introduced in step five. Instead, 5 kg of Al-4.5Cu-1.5Mg alloy is melted in a 5kW graphite crucible resistance furnace at a temperature of 740℃. After the alloy melts, 15g of the AlTi5B1 refining agent tube prepared in step four is added over 30 seconds. The mixture is stirred for 5 seconds, allowed to stand for 10 minutes, and then poured into a mold. After cooling, a casting is obtained. All other steps and parameters are the same as in Example 1.

[0068] Example 4: The difference between this example and Example 1 is that AlTi5B1 alloy wire is prepared in step four; AlTi5B1 alloy wire is added in step five for refining. Specifically, in step four, the Al-Ti-B melt after mechanical vibration treatment is fed into a continuous casting and rolling mill at 750°C to produce AlTi5B1 alloy wire with a diameter of 12mm. In step five, 5kg of Al-4.5Cu-1.5Mg alloy is melted in a 5kW graphite crucible resistance furnace at a temperature of 740°C. After the alloy melts, AlTi5B1 alloy wire is added. An argon cylinder is connected to a jet pipe with an argon pressure of 0.1MPaa. First, 15g of the AlTi5B1 alloy wire prepared in step four is added, and the refining agent is added to the pipe for 30s. Then, high-purity argon is introduced into the melt for 30s. After stirring for 5s and standing for 10min, the refined aluminum liquid is poured into a mold and cooled to obtain a casting. The other steps and parameters are the same as in Example 1.

[0069] Table 1 shows the grain size results of the refined castings obtained in Examples 1-4;

[0070] Table 2 shows the wear rate and weight loss of the grain-refined castings obtained in Examples 1-4 during the friction test.

[0071] Table 3 shows the oxygen content in the grain-refined castings obtained in Examples 1-4.

[0072] Table 1

[0073]

[0074] Table 2

[0075]

[0076] Table 3

[0077]

[0078] As can be seen from Tables 1 to 3, the grain-refined castings obtained in Example 1 have the smallest grain size, the best refining effect, the best wear resistance, and the lowest oxygen content.

Claims

1. A method for preparing Al-Ti-B refining agent pipes based on mechanical vibration, characterized in that... The method is specifically implemented according to the following steps:

1. Heat aluminum ingots to 700℃~750℃ and melt them to obtain molten aluminum; introduce argon gas into the molten aluminum to degas and remove slag, then add a mixture of KBF4 and K2TiF6, and then alloy it under the action of stirring in a medium-frequency electromagnetic field at a temperature of 700-750℃ to obtain Al-Ti-B melt.

2. Sprinkle light calcium carbonate evenly on the surface of Al-Ti-B melt, remove the residual liquid and skim off the slag to obtain Al-Ti-B melt; 3. Adjust the temperature of the Al-Ti-B melt to 750℃~900℃, then transfer the melt into the casting furnace through the trough. Use argon gas to refine and degas the melt. At the same time as degassing, turn on the mechanical vibration system to mechanically vibrate the melt. After the vibration is finished, let it stand still and remove the surface slag to obtain the mechanically vibrated Al-Ti-B melt.

4. The mechanically vibrated Al-Ti-B melt is cast into ingots and extruded into pipes to obtain Al-Ti-B refining agent pipes.

2. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... In step one, the time for introducing argon gas into the molten aluminum for degassing is 5 min to 15 min, the pressure of the argon gas is 0.1 MPa to 0.5 MPa, and the purity of the argon gas is high-purity argon gas.

3. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... The mass ratio of aluminum ingot, KBF4 and K2TiF6 mentioned in step one is (6~11):(1~3):(2~5).

4. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... In step one, the mixture of KBF4 and K2TiF6 is added in batches, and the total feeding time of the mixture of KBF4 and K2TiF6 is 5 min to 30 min; the alloying time mentioned in step one is 10 min to 60 min.

5. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... The composition of the Al-Ti-B melt mentioned in step one is Al-Ti5-B1 ​​or Al-Ti3-B1.

6. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... The static time mentioned in step three is 10 min to 30 min; the mechanical vibration time mentioned in step three is 5 s to 30 s, the frequency of the mechanical vibration is 50 Hz, the direction of the mechanical vibration is X and / or Y, and the amplitude of the mechanical vibration is 1 mm.

7. The method for preparing Al-Ti-B refining agent pipes based on mechanical vibration according to claim 1, characterized in that... The inner diameter of the Al-Ti-B refining agent tube mentioned in step four is 5mm~10mm, and the wall thickness of the tube is 1mm~2mm.

8. The application of the Al-Ti-B refining agent pipe prepared by the method according to any one of claims 1 to 7, characterized in that... Al-Ti-B grain refiner tubing is used for grain refinement of aluminum alloys.

9. The application of the Al-Ti-B refining agent in pipes according to claim 8, characterized in that... Al-Ti-B grain refiner tubing is used for grain refinement of aluminum alloys, specifically by following these steps: I. Smelting: The aluminum alloy to be refined is heated and melted to obtain the aluminum alloy melt.

2. Argon gas is introduced into the cavity of the Al-Ti-B refining agent tube, and then the Al-Ti-B refining agent tube is inserted into the aluminum alloy melt to be refined. After the Al-Ti-B refining agent tube is completely melted, the argon gas is stopped, the mixture is stirred for 5 seconds, and then allowed to stand for 10 to 20 minutes to obtain the aluminum alloy with refined grains. The mass of the Al-Ti-B refining agent tubing mentioned in step two is 0.1% to 1% of the mass of the aluminum alloy to be refined; The pressure of the argon gas mentioned in step two is 0.1MPa~0.5MPa, and the time for introducing the argon gas is the same as the time for adding the Al-Ti-B refining agent to the tubing. III. Pouring: The refined aluminum alloy is poured into a mold and cooled to obtain a refined-grained casting.

10. The application of the Al-Ti-B refining agent in pipes according to claim 9, characterized in that... In step one, the aluminum alloy to be refined is Al-4.5Cu-1.5Mg, and the heating and melting temperature is 740℃~780℃. In step two, argon gas is introduced into the cavity of the Al-Ti-B refining agent tube, and then the Al-Ti-B refining agent tube is inserted into the molten aluminum alloy to be refined at a temperature of 740℃~780℃.

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