CN111304498A - Method for producing 8021 aluminum alloy for lithium battery by casting method - Google Patents
Method for producing 8021 aluminum alloy for lithium battery by casting method Download PDFInfo
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- CN111304498A CN111304498A CN202010305430.XA CN202010305430A CN111304498A CN 111304498 A CN111304498 A CN 111304498A CN 202010305430 A CN202010305430 A CN 202010305430A CN 111304498 A CN111304498 A CN 111304498A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
Abstract
The invention relates to a method for producing 8021 aluminum alloy for a lithium battery by a casting method, and belongs to the field of aluminum processing. The method comprises the following steps: burdening, smelting, degassing and deslagging, standing, online degassing and filtering, and casting; the components of the cast alloy are that an aluminum alloy melt is smelted according to the chemical components of the 8021 aluminum alloy, then the aluminum alloy melt is degassed and deslagged, and after the hydrogen content is monitored on line and qualified, a metal plate ingot is cast. The 8021 aluminum alloy for the lithium battery produced by the casting method is simple and convenient, and the 8021 aluminum alloy prepared by the method has good metallurgical property, hot-working structure property, high strength and high toughness.
Description
Technical Field
The invention belongs to the field of aluminum material processing, and particularly relates to a method for producing 8021 aluminum alloy for a lithium battery by a casting method.
Background
The aluminum alloy is one of the key materials of the lithium battery, and the aluminum alloy for the 8021 lithium battery has the characteristics of high plasticity, good corrosion resistance, good electrical conductivity and thermal conductivity, good formability, certain strength and the like, and is widely applied to the electronic industry. However, the existing 8021 aluminum alloy for the lithium battery and the manufacturing method thereof have the following problems: the existing soft packing foil blank for the aluminum plastic film has complex manufacturing process, poor cold stamping formability, and poor puncture resistance and stability, so that the finished product has poor performance and is easy to crack and puncture; therefore, it is highly desirable to provide a 8021 aluminum alloy for lithium batteries, which is resistant to folding and stamping and has good sealing performance, and a preparation method thereof.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the 8021 aluminum alloy for the lithium battery produced by the casting method and the preparation method thereof, and the aluminum alloy prepared by the method has high yield strength, high fracture toughness and high stress corrosion resistance.
In order to achieve the purpose, the invention adopts the technical scheme that:
an 8021 aluminum alloy for a lithium battery comprises the following elements in percentage by mass: 1.5-2.0% of Fe, less than 0.25% of Si, less than 0.1% of Cu, less than 0.1% of Mn, less than 0.05% of Mg, less than 0.05% of Cr, less than 0.05% of Zn, less than 0.05% of Ti and the balance of Al.
The invention also provides a method for producing the 8021 aluminum alloy for the lithium battery by a casting method, which comprises the following steps of:
adding an aluminum ingot into a smelting furnace for smelting, adding the other elements in the claim 1 according to the proportion of the components after the aluminum is leveled, stirring and smelting, and then refining; removing the surface scum after refining; continuously smelting, carrying out particle refining, smelting again, and carrying out particle refining again before turning down the furnace; introducing the aluminum liquid into a standing furnace and refining; and (4) standing after refining, removing floating slag, and casting after online degassing and filtering of the aluminum liquid refined by the standing furnace.
Further, the method comprises:
adding raw materials into a smelting furnace according to the components of claim 1, smelting the raw materials at the furnace temperature of 900-920 ℃, slagging and refining when aluminum is horizontally molten and the temperature of the aluminum liquid reaches 680-710 ℃ after 3-5 hours of smelting, and removing surface scum after refining; smelting for 1-2 hours, refining particles after the temperature of the molten aluminum reaches 720-730 ℃, continuing to smelt for 0.5-1 hour after the refining of the particles is finished, and refining the particles again before turning down the furnace, namely finishing the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace for refining, standing for 12-16 min after refining is completed, and removing floating slag to complete smelting in the standing furnace, wherein the refining frequency of the standing furnace is 3-3.5 hours/time; the temperature in the furnace is 730-745 ℃ in the smelting process in the standing furnace.
Further, the casting includes the steps of: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the degassing flow is 25-40L/min, the rotating speed of the rotor is 380-450 rpm, and nitrogen is introduced into a degassing box for protection; introducing the molten aluminum into a secondary filter box after online degassing and deslagging, and filtering the secondary filter box by using a 40ppi +60ppi filter plate to remove impurities in the molten aluminum; guiding the filtered aluminum water into the front box through the flow groove, wherein the flow groove is covered in the whole process, and the temperature of the aluminum water is 690-710 ℃ when the aluminum water reaches the front box; finally casting the aluminum alloy plate ingot with the specification of 360X 400X 5600 mm.
Further, the temperature is increased to 730-750 ℃ before the furnace is turned down.
Furthermore, the hydrogen content and the slag content of the aluminum melt are detected at the front chute position, and the hydrogen content is controlled to be below 0.12mL/(100g Al).
Further, the nitrogen pressure is 0.3-0.4 MPa.
Further, an AL-Ti-B grain refiner is added at the inlet of the degassing tank.
Furthermore, the flow of cooling water in the casting process is 55-60 m3/h。
Further, the casting speed is 45-55 mm/min.
Has the advantages that:
the method for producing the 8021 aluminum alloy for the lithium battery by the casting method is simple and convenient, and the aluminum alloy prepared by the method has high yield strength, high fracture toughness, high stress corrosion resistance and good hot workability, can be applied to high-end fields such as lithium batteries and medical product packaging, and has wide market prospect.
In the preparation process of the 8021 lithium battery aluminum alloy, the segregation of components of a cast plate blank is effectively eliminated by using AL-Ti-C grain refiner, high-speed casting, large cooling water flow and other casting process control, the chemical components are uniform, the plate blank grain size is 1 grade, and finally the plasticity of the aluminum alloy product is well improved.
The method comprises the following steps: burdening, smelting, degassing and deslagging, standing, online degassing and filtering, and casting; the components of the cast alloy are that an aluminum alloy melt is smelted according to the chemical components of the 8021 aluminum alloy, then the aluminum alloy melt is degassed and deslagged, and after the hydrogen content is monitored on line and qualified, a metal plate ingot is cast. The 8021 aluminum alloy for the lithium battery produced by the casting method is simple and convenient, and the 8021 aluminum alloy prepared by the method has good metallurgical property, hot-working structure property, high strength and high toughness.
Detailed Description
The following examples further describe embodiments of the present invention in detail. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
An 8021 aluminum alloy for a lithium battery comprises the following elements in percentage by mass: 1.68 percent of Fe, 0.21 percent of Si, 0.05 percent of Cu, 0.05 percent of Mn, 0.01 percent of Mg0.05 percent, less than 0.05 percent of Cr, less than 0.05 percent of Zn, 0.042 percent of Ti, and the balance of Al.
The preparation method of the 8021 aluminum alloy for the lithium battery comprises the following steps:
the components are mixed and calculated in a smelting furnace, the total amount of the covalently-added aluminum ingot and the intermediate alloy is 25t, all raw materials are smelted under the furnace temperature condition of 900 ℃, slagging and refining are carried out when aluminum is horizontally smelted after 4.5 hours of smelting and the temperature of aluminum liquid reaches 692 ℃, and surface scum is removed after refining; performing re-smelting for 1.8 hours, namely performing the 1 st particle refining after the temperature of the molten aluminum reaches 724 ℃, continuing smelting for 0.8 hour after the refining is finished, heating to 743 ℃, and performing the last particle refining before pouring, namely finishing the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace, refining the particles for 20min, standing for 14min after refining is finished, removing floating slag, namely finishing smelting in the standing furnace, wherein the refining frequency of the standing furnace is 3 hours/time; the temperature in the furnace in the standing furnace smelting process is 733-737 ℃.
Further, the casting process comprises the following steps: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the degassing flow is 28L/min, the rotor rotation speed is 410rpm, the pressure of nitrogen introduced into a degassing box is 0.3Mpa, an AL-Ti-C grain refiner is added at the inlet of the degassing box, and the temperature of the inlet of the degassing box is 723 ℃; introducing the molten aluminum into a secondary filter box after online degassing and deslagging, and filtering the secondary filter box by using a 40ppi +60ppi filter plate to remove impurities in the molten aluminum; the filtered molten aluminum is introduced into the crystallizer through a launder, and the temperature of the molten aluminum reaches 698 ℃ when the molten aluminum reaches the crystallizer.
Casting the treated molten aluminum to finish the casting of the aluminum alloy; wherein the flow rate of cooling water in the casting process is 58.2m3H is used as the reference value. The casting speed was 48 mm/min. The tensile strength of the final 8021 soft packing foil material product is 123Mpa, the elongation reaches 22 percent, the cup crown value is 7.5mm, and the pinhole rate is 0/m2。
Example 2
An 8021 aluminum alloy for a lithium battery comprises the following elements in percentage by mass: 1.75 percent of Fe, 0.23 percent of Si, 0.04 percent of Cu, 0.03 percent of Mn, 0.01 percent of Mg0.05 percent of Cr, less than 0.05 percent of Zn, 0.042 percent of Ti, and the balance of Al.
The preparation method of the 8021 aluminum alloy for the lithium battery comprises the following steps:
the components are mixed and calculated in a smelting furnace, the total amount of the covalently-added aluminum ingots and the intermediate alloys is 24.3t, all the raw materials are smelted under the furnace temperature condition of 900 ℃, the aluminum is leveled after 4.2 hours of smelting, and when the temperature of the aluminum liquid reaches 695 ℃, the slag is removed and refined, and the surface scum is removed after the refining; performing re-smelting for 1.5 hours, namely performing the 1 st particle refining after the temperature of the molten aluminum reaches 728 ℃, continuing smelting for 0.5 hour after the refining is finished, heating to 744 ℃, and performing the last particle refining before pouring, namely finishing the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace, refining the particles for 20min, standing for 12min after refining is finished, removing floating slag, namely finishing smelting in the standing furnace, wherein the refining frequency of the standing furnace is 3.2 hours/time; the temperature in the furnace is 735-739 ℃ in the process of standing in-furnace smelting.
Further, the casting process comprises the following steps: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the degassing flow is 35L/min, the rotor rotation speed is 418rpm, the pressure of nitrogen introduced into a degassing box is 0.3Mpa for protecting nitrogen, an AL-Ti-C grain refiner is added into the inlet of the degassing box, and the temperature of the inlet of the degassing box is 723 ℃; introducing the molten aluminum into a secondary filter box after online degassing and deslagging, and filtering the secondary filter box by using a 40ppi +60ppi filter plate to remove impurities in the molten aluminum; the filtered molten aluminum is introduced into the crystallizer through a launder, and the temperature of the molten aluminum reaches the crystallizer and is 702 ℃.
Casting the treated molten aluminum to finish the casting of the aluminum alloy; wherein the flow rate of cooling water in the casting process is 55.3m3H is used as the reference value. The casting speed was 45 mm/min. The tensile strength of the final 8021 soft packing foil material product is 115Mpa, the elongation reaches 24 percent, the cup crown value is 8.5mm, and the pinhole rate is 0/m2。
Comparative example 1
The 8021 alloy is produced by using a casting and rolling process, wherein the melted liquid comprises the following chemical components in percentage by mass: 1.65% of Fe1, 0.15% of Si0, 0.05% of Cu0, 0.03% of Mn0, 0.01% of Mg0, less than 0.05% of Cr, less than 0.05% of Zn, 0.035% of Ti0.035% of Al in balance; the water inlet flow of the upper and lower rollers of the roller is 110m3H, the hydrogen content of the front box aluminum liquid is 0.11mL/(100g Al), the temperature of the front box aluminum liquid is 693 ℃, the production speed is 750mm/min, and the slab thickness is 7.0 mm; homogenizing and annealing the cast-rolled blank: the material temperature is 500 ℃, and the heat preservation time is 8 h. The final 8021 soft packing foil material product has a thickness of 0.05mm, a tensile strength of 110Mpa, an elongation of 19%, and a cup crown value7.1mm, a pinhole rate of 0/m2。
As can be seen from the performance data of examples 1 and 2, the tensile strength, elongation and cup crown of the mechanical properties of the 8021 alloy soft packing foil produced by the casting method are all higher than those of the comparative example, because the 8021 alloy produced by the casting method has good uniformity of crystal grains, the crystal grains are uniform and fine, the performance is good, and the quality of the dark side of the aluminum foil finished product is higher than that of the cast-rolling method because the crystal grain size is uniform and fine.
Claims (10)
1. The 8021 aluminum alloy for the lithium battery is characterized in that the aluminum alloy comprises the following elements in percentage by mass: 1.5-2.0% of Fe, less than 0.25% of Si, less than 0.15% of Cu, less than 0.1% of Mn, less than 0.05% of Mg, less than 0.05% of Cr, less than 0.05% of Zn, less than 0.05% of Ti and the balance of Al.
2. The casting method for producing the 8021 aluminum alloy for lithium batteries as claimed in claim 1, comprising the steps of:
adding an aluminum ingot into a smelting furnace for smelting, adding the other elements in the claim 1 according to the proportion of the components after the aluminum is leveled, stirring and smelting, and then refining; removing the surface scum after refining; continuously smelting, carrying out particle refining, smelting again, and carrying out particle refining again before turning down the furnace; introducing the aluminum liquid into a standing furnace and refining; and (4) standing after refining, removing floating slag, and casting after online degassing and filtering of the aluminum liquid refined by the standing furnace.
3. The casting method for producing an 8021 aluminum alloy for a lithium battery as claimed in claim 2, wherein the method comprises:
adding raw materials into a smelting furnace according to the components of claim 1, smelting the raw materials at the furnace temperature of 900-920 ℃, slagging and refining when aluminum is horizontally molten and the temperature of the aluminum liquid reaches 680-710 ℃ after 3-5 hours of smelting, and removing surface scum after refining; smelting for 1-2 hours, refining particles after the temperature of the molten aluminum reaches 720-730 ℃, continuing to smelt for 0.5-1 hour after the refining of the particles is finished, and refining the particles again before turning down the furnace, namely finishing the smelting operation in the smelting furnace;
introducing the aluminum liquid into a standing furnace for refining, standing for 12-16 min after refining is completed, and removing floating slag to complete smelting in the standing furnace, wherein the refining frequency of the standing furnace is 3-3.5 hours/time; the temperature in the furnace is 730-745 ℃ in the smelting process in the standing furnace.
4. The method for producing an 8021 aluminum alloy for a lithium battery by casting according to claim 2, wherein the casting comprises the steps of: the aluminum liquid enters an online degassing device through a standing furnace, argon is introduced into a graphite rotor, the degassing flow is 25-40L/min, the rotating speed of the rotor is 380-450 rpm, and nitrogen is introduced into a degassing box for protection; introducing the molten aluminum into a secondary filter box after online degassing and deslagging, and filtering the secondary filter box by using a 40ppi +60ppi filter plate to remove impurities in the molten aluminum; guiding the filtered aluminum water into the front box through the flow groove, wherein the flow groove is covered in the whole process, and the temperature of the aluminum water is 690-710 ℃ when the aluminum water reaches the front box; finally casting the aluminum alloy plate ingot with the specification of 360X 400X 5600 mm.
5. The casting method for producing 8021 aluminum alloy for lithium batteries as claimed in claim 2, wherein the temperature is raised to 730-750 ℃ before the furnace is turned down.
6. The casting method for producing 8021 aluminum alloy for lithium batteries as claimed in claim 4, wherein the hydrogen content and slag content of the aluminum melt are measured at the front chute position, and the hydrogen content is controlled to be less than 0.12mL/(100g Al).
7. The casting method for producing an 8021 aluminum alloy for a lithium battery as claimed in claim 4, wherein the nitrogen pressure is 0.3 to 0.4 Mpa.
8. The casting method for producing 8021 aluminum alloy for lithium battery as claimed in claim 4, wherein Al-Ti-B grain refiner is added to the inlet of the degassing tank.
9. The 8021 aluminum for producing lithium batteries by the casting method according to claim 2The method for preparing the alloy is characterized in that the flow of cooling water in the casting process is 55-60 m3/h。
10. The casting method for producing the 8021 aluminum alloy for lithium batteries as claimed in claim 2, wherein the casting speed is 45 to 55 mm/min.
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Cited By (2)
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| CN111893351A (en) * | 2020-08-11 | 2020-11-06 | 华北铝业有限公司 | Aluminum foil for 1235D lithium battery and preparation method thereof |
| CN115305369A (en) * | 2022-08-19 | 2022-11-08 | 河南科技大学 | 8021 aluminum foil, preparation method thereof and 8021 aluminum alloy material |
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Cited By (4)
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| CN111893351A (en) * | 2020-08-11 | 2020-11-06 | 华北铝业有限公司 | Aluminum foil for 1235D lithium battery and preparation method thereof |
| CN111893351B (en) * | 2020-08-11 | 2021-12-10 | 华北铝业有限公司 | Aluminum foil for 1235D lithium battery and preparation method thereof |
| CN115305369A (en) * | 2022-08-19 | 2022-11-08 | 河南科技大学 | 8021 aluminum foil, preparation method thereof and 8021 aluminum alloy material |
| CN115305369B (en) * | 2022-08-19 | 2024-01-19 | 河南科技大学 | 8021 aluminum foil and preparation method thereof, and 8021 aluminum alloy material |
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