CN113174507A - Al-RE-B refiner for aluminum alloy foil and preparation method thereof - Google Patents
Al-RE-B refiner for aluminum alloy foil and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an Al-RE-B refiner for aluminum alloy foil and a preparation method thereof, belonging to the technical field of material science and engineering, wherein the refiner comprises 4.5-5.5% of rare earth, 0.9-1.1% of boron, 0.3-0.5% of other impurities and the balance of aluminum by weight percentage. The preparation method mainly comprises the steps of selecting and matching aluminum ingots, smelting, refining, deslagging and the like, and finally casting into ingots. Rolling the aluminum ingot refined by the refiner into an aluminum foil plate with the thickness of 0.9-1.1 mm, and carrying out annealing and recrystallization treatment to obtain the aluminum foil plate with the grain size of less than 30 mu m, the electric conductivity of 60% IACS and the thermal conductivity of 210W/K x m. The electrode produced by the aluminum foil plate can be assembled by using the traditional battery process; in the battery operation process, the resistance loss is greatly reduced, the power consumption is saved, the battery efficiency is improved, the heating problem in the battery working process is reduced, and the service life and the safety of the battery are improved.
Description
Technical Field
The invention belongs to the technical field of material science and engineering, and particularly relates to an Al-RE-B refiner for aluminum alloy foil and a preparation method thereof.
Background
The lithium battery is taken as an environment-friendly energy storage rechargeable battery, and is particularly emphasized by virtue of the characteristics of high energy storage density, stable electrical property, long service life and the like; the aluminum electrode foil, as an important component of a lithium battery, is required to have a good grain structure, to improve the strength of the aluminum electrode foil, to ensure that the electrode is not damaged during the assembly process, and to improve the conductivity of the aluminum electrode foil as much as possible, which is an item to be improved urgently.
In recent years, the new energy power battery industry is rapidly developed, and the requirements on the performance of the aluminum electrode foil are higher and higher. In order to increase the proportion of electrode materials in the electrode and increase the energy density of the battery, the thickness of the aluminum electrode foil is reduced to be below 15 mu m, and in order to ensure the integrity of the electrode in the assembling and compacting process, the strength of the material is required to be increased to be more than 200MPa, and the conductivity of the material is required to be more than 34% IACS.
Currently, Al-Ti-B-based refiners, which are commercially available, have excellent performance in refining the structure, but the presence of Ti has a fatal impairment in conductivity.
Meanwhile, the solid solution of impurity elements such as Fe, Si, O and the like in the industrial pure aluminum obviously increases the resistivity of the aluminum foil, and the technical problem of how to simultaneously meet the contradiction that the aluminum alloy material has good structure, improved strength and high electric conductivity and high heat conductivity is the technical problem.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide an Al-RE-B refiner for aluminum alloy foil and a preparation method thereof, which are environment-friendly and have good rust resistance effect.
The technical scheme is as follows: the invention adopts the following technical scheme: an Al-RE-B refiner for aluminum alloy foil comprises the following components in percentage by weight: 4.5-5.5% of rare earth, 0.9-1.1% of boron, 0.3-0.5% of other impurities and the balance of aluminum.
Further, the preparation method of the Al-RE-B refiner for the aluminum alloy foil comprises the following steps:
1) weighing industrial pure aluminum ingots according to a proportion, smelting, stirring uniformly after completely melting, adding a refining agent, standing, purifying an aluminum melt, and cleaning surface slag to obtain an alloy liquid I;
2) adding an aluminum-boron alloy into the alloy liquid I according to a proportion, stirring uniformly after the aluminum-boron alloy is completely melted, standing, purifying an aluminum melt, and cleaning aluminum slag on the surface to obtain an alloy liquid II;
3) adding an aluminum-rare earth intermediate alloy into the alloy liquid II according to a proportion, stirring uniformly after completely melting, keeping the temperature for 30-60 min, stirring during the period to ensure full reaction, standing, purifying the aluminum melt, and cleaning aluminum slag on the surface to obtain alloy liquid III;
4) and casting the alloy liquid III into ingots, and cooling to room temperature to obtain the Al-RE-B refiner for the aluminum alloy foil.
Further, in the step 1), the aluminum boron alloy contains 2.8 to 3.2 wt.% of boron.
Further, in the step 3), the content of rare earth in the aluminum-rare earth master alloy is 9.5-10.5 wt.%.
Further, in the step 1), the temperature of the smelting process is 740-760 ℃.
Further, in the step 2), the temperature of the alloy liquid II and the temperature of the alloy liquid III are kept at 740-760 ℃ in the processes of preparing the alloy liquid II and preparing the alloy liquid III in the step 3).
Further, the adding amount of the refining agent in the step 1) is 0.1-0.3% of the total mass of the alloy liquid I, and the refining agent comprises the following components in percentage by mass: 15-25% of sodium chloride, 30-40% of potassium chloride, 5-12% of hexachloromethane, 3-7% of potassium fluoborate, 12-16% of sodium fluoroaluminate and 10-20% of charcoal powder.
Further, in the step 1), the step 2) and the step 3), stirring is carried out in a mode of blowing nitrogen or inert gas in the stirring process, the stirring time is 2-3 min, and the standing time is 3-10 min.
Further, in the step 4), a metal mold is adopted in the process of casting into an ingot.
Furthermore, the aluminum alloy foil plate is obtained by treating the aluminum alloy foil with the Al-RE-B refiner, wherein the aluminum alloy foil plate contains 0.05-0.15 wt% of rare earth and 0.01-0.03 wt% of boron, has a fine recrystallized grain structure, high electrical conductivity and high thermal conductivity, the grain size of the aluminum alloy foil plate is less than 30 mu m, the electrical conductivity is more than 60% IACS, and the thermal conductivity is more than 210W/K m.
Further, casting the aluminum liquid into an aluminum ingot by the aluminum alloy melt treated by the Al-RE-B refiner by adopting a sand mold, rolling into an aluminum alloy foil plate with the thickness of 0.9-1.1 mm, and carrying out complete recrystallization annealing treatment.
Further, the aluminum alloy foil plate is applied to producing electrodes of batteries.
The Al-RE-B refiner is used for providing nucleation particles and redundant rare earth elements on an aluminum matrix, and has super strong phase precipitation capacity with impurity elements such as Fe, Si, O and the like while refining the structure, so that the deep desolventization of the impurity elements is promoted, the damage of the impurity elements to the electrical conductivity is reduced, and the requirements of good structure, high electrical conductivity and high thermal conductivity of an aluminum alloy material are met.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects:
1. the Al-RE-B refiner only has extremely low solid solubility of the residual rare earth elements in aluminum and has extremely strong phase forming capability with impurity elements such as Si, Fe, O and the like, and the invention can effectively reduce the solid solubility of the impurity elements such as Fe, Si, O and the like in the aluminum and precipitate a phase through the microalloying of the rare earth elements, thereby not only reducing the damage of the impurity elements to the conductivity, but also playing a role in precipitation strengthening and reducing the influence on the conductivity of a hard aluminum wire on the premise of ensuring that the Al-RE-B refiner has fine grain structure and improves the strengthening effect;
2. the rare earth boride refined particles contained in the Al-RE-B refiner can provide nucleation mass points for aluminum nucleation, greatly improve the nucleation rate and effectively refine the alloy structure, and the rare earth boride particles have good electrical conductivity and thermal conductivity, so that the electrical conductivity and the thermal conductivity of the alloy are further improved.
3. After the Al-RE-B refiner is used for treating the aluminum alloy foil plate, the aluminum alloy foil plate for the lithium battery collector foil with the grain size of less than 30 microns, the electric conductivity of 60% IACS and the thermal conductivity of 210W/K x m can be prepared.
4. The electrode produced by the aluminum foil treated by the Al-RE-B refiner can be assembled by the traditional battery process; in the battery operation process, the resistance loss is reduced, the battery efficiency is improved, the heating problem in the battery working process is reduced, and the battery safety is improved.
Drawings
FIG. 1 is an X-ray diffraction pattern of an Al-RE-B refiner;
FIG. 2 is a scanning electron microscope microstructure picture of the Al-RE-B refiner;
FIG. 3 is a polarized structure of an aluminum alloy foil plate treated by adding an Al-RE-B refiner;
FIG. 4 is a polarizing structure of an aluminum alloy foil plate without being treated by a refiner;
FIG. 5 shows the polarized structure of the aluminum alloy foil plate treated with the Al-Ti-B refiner.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
An Al-RE-B refiner for aluminum alloy foil comprises the following components in percentage by weight: 4.5-5.5% of rare earth, 0.9-1.1% of boron, 0.3-0.5% of other impurities and the balance of aluminum.
A preparation method of an Al-RE-B refiner for aluminum alloy foil comprises the following steps:
1) weighing industrial pure aluminum ingots according to a proportion, smelting, stirring uniformly after completely melting, adding a refining agent, standing, purifying an aluminum melt, and cleaning surface slag to obtain an alloy liquid I;
2) adding an aluminum-boron alloy into the alloy liquid I according to a proportion, stirring uniformly after the aluminum-boron alloy is completely melted, standing, purifying an aluminum melt, and cleaning aluminum slag on the surface to obtain an alloy liquid II;
3) adding an aluminum-rare earth intermediate alloy into the alloy liquid II according to a proportion, stirring uniformly after completely melting, keeping the temperature for 30-60 min, stirring during the period to ensure full reaction, standing, purifying the aluminum melt, and cleaning aluminum slag on the surface to obtain alloy liquid III;
4) and casting the alloy liquid III into ingots, cooling to room temperature to obtain the Al-RE-B refiner for the aluminum alloy foil, and sampling the Al-RE-B refiner for X-ray diffraction analysis and scanning electron microscope microstructure analysis, wherein the results are respectively shown in figure 1 and figure 2.
Further, in the step 1), the aluminum boron alloy contains 2.8 to 3.2 wt.% of boron.
In the step 3), the content of the rare earth in the aluminum-rare earth intermediate alloy is 9.5-10.5 wt.%.
In the step 1), the temperature of the smelting process is 740-760 ℃.
In the step 2), the temperature of the alloy liquid II and the temperature of the alloy liquid III are kept at 740-760 ℃ in the process of preparing the alloy liquid II and preparing the alloy liquid III in the step 3).
Further, in the step 1), the adding amount of a refining agent is 0.1-0.3% of the total mass of the alloy liquid I, and the refining agent comprises the following components in percentage by mass: 15-25% of sodium chloride, 30-40% of potassium chloride, 5-12% of hexachloromethane, 3-7% of potassium fluoborate, 12-16% of sodium fluoroaluminate and 10-20% of charcoal powder.
In the steps 1), 2) and 3), stirring in a nitrogen or inert gas blowing mode is adopted in the stirring process, the stirring time is 2-3 min, and the standing time is 3-10 min.
In the step 4), a metal mold is adopted in the casting ingot forming process.
Further, casting the aluminum liquid into an aluminum ingot by the aluminum alloy melt treated by the Al-RE-B refiner by adopting a sand mold, rolling into an aluminum alloy foil plate with the thickness of 0.9-1.1 mm, and carrying out complete recrystallization annealing treatment.
An aluminum alloy foil plate is formed by treating an aluminum alloy foil with an Al-RE-B refiner, wherein the aluminum alloy foil plate contains 0.05-0.15 wt% of rare earth and 0.01-0.03 wt% of boron, has a fine recrystallized grain structure, high electrical conductivity and high thermal conductivity, has a grain size of less than 30 mu m, an electrical conductivity of more than 60% IACS and a thermal conductivity of more than 210W/K x m, and has a corresponding polarized light structure as shown in figure 3.
Use of an aluminium alloy foil sheet for the production of an electrode for a battery.
In comparison, the aluminum alloy foil plates treated without adding the refiner and the aluminum alloy foil plates treated with the Al-5Ti-B refiner in the same proportion are respectively designed, and the corresponding polarization structures are respectively shown in fig. 4 and 5. The aluminum alloy foil plates related in the invention all adopt the same preparation process and size specification.
Example 1:
an Al-RE-B refiner, which comprises the following components in percentage by weight:
4.66 percent of rare earth,
0.91 percent of boron,
0.32 percent of other impurities,
the balance being aluminum.
The preparation method comprises the following steps:
1) the total weight of the refiner aluminum ingot is designed to be 1 kg, 164.77 g of industrial pure aluminum ingot is selected and melted in a shaft furnace, the melting temperature is 750 ℃, and 0.49 g of refining agent (comprising the following components: 20% of sodium chloride, 37% of potassium chloride, 8% of hexachloromethane, 5% of potassium fluoborate, 13% of sodium fluoroaluminate and 17% of charcoal powder), then blowing nitrogen gas, stirring for 3min, standing for 8min, and cleaning surface slag to obtain alloy liquid I;
2) adding 342.11 g of aluminum boron alloy (the boron content is 2.8 wt.%, and the burning loss rate is calculated as 5%) into the alloy liquid I until the alloy liquid I is completely melted, uniformly stirring, standing, purifying the aluminum melt, cleaning aluminum slag on the surface to obtain alloy liquid II, and keeping the temperature of the aluminum liquid 745 ℃ in the process;
3) adding 493.12 g of aluminum-rare earth intermediate alloy (the content of rare earth is 10.5 wt.%, the burning loss rate is calculated by 10%) into the alloy liquid II, blowing nitrogen, stirring for 2min, standing for 3min, and cleaning aluminum slag on the surface to obtain alloy liquid III; sampling, and analyzing the content of rare earth elements in the alloy liquid III to be 4.66 wt% and the content of boron elements to be 0.91 wt% by using an inductively coupled plasma emission spectrometer;
4) and standing for 4min, casting the alloy liquid III into an aluminum ingot by using an iron mold, and cooling to room temperature to obtain the refiner.
5) Treating industrial pure aluminum by using an aluminum ingot refiner formed by casting the alloy liquid III to obtain alloy liquid IV, and sampling to analyze the content of rare earth elements and the content of boron elements in the alloy to be 0.1 wt.% and 0.02 wt.% by using an inductively coupled plasma emission spectrometer;
6) and casting the alloy liquid IV into an aluminum ingot, milling the aluminum ingot into a surface, rolling the aluminum ingot into an aluminum foil plate with the thickness of 1.0mm by adopting a cold rolling mill with the pass reduction rate of 25%, and then carrying out complete recrystallization treatment.
The grain size, the electric conductivity and the heat conductivity of the aluminum foil plate are detected, the grain size is 24 mu m, and the resistivity is 2.801 multiplied by 10-8Ω · m, electrical conductivity 61.55% IACS, thermal conductivity 213.27W/K × m.
Example 2:
an Al-RE-B refiner, which comprises the following components in percentage by weight:
4.5 percent of rare earth,
0.9 percent of boron,
0.5 percent of other impurities,
the balance being aluminum.
The preparation method comprises the following steps:
1) the total weight of the refiner aluminum ingot is designed to be 1 kg, 177.63 g of industrial pure aluminum ingot is selected and melted in a shaft furnace, the melting temperature is 740 ℃, 0.53 g of refining agent (comprising the following components: 20% of sodium chloride, 37% of potassium chloride, 8% of hexachloromethane, 5% of potassium fluoborate, 13% of sodium fluoroaluminate and 17% of charcoal powder), then blowing nitrogen gas, stirring for 3min, standing for 8min, and cleaning surface slag to obtain alloy liquid I;
2) adding 296.05 g of aluminum boron alloy (the boron content is 3.2 wt.%, and the burning loss rate is calculated as 5%) into the alloy liquid I until the alloy liquid I is completely melted, uniformly stirring, standing, purifying the aluminum melt, cleaning aluminum slag on the surface to obtain alloy liquid II, and keeping the temperature of the aluminum liquid at 740 ℃ in the process;
3) adding 526.32 g of aluminum-rare earth intermediate alloy (the content of rare earth is 9.5 wt.%, the burning loss rate is calculated by 10%) into the alloy liquid II, blowing nitrogen, stirring for 2min, standing for 3min, and cleaning aluminum slag on the surface to obtain alloy liquid III; sampling, and analyzing the content of rare earth elements in the alloy liquid III by using an inductively coupled plasma emission spectrometer to obtain 4.5 wt% and 0.9 wt% of boron elements;
4) and standing for 4min, casting the alloy liquid III into an aluminum ingot by using an iron mold, and cooling to room temperature to obtain the refiner.
5) Refining an aluminum ingot cast from the alloy liquid III to process industrial pure aluminum to obtain alloy liquid IV, and sampling to analyze the content of rare earth elements and the content of boron elements in the alloy to be 0.06 wt.% and 0.01 wt.% by using an inductively coupled plasma emission spectrometer;
6) and casting the alloy liquid IV into an aluminum ingot, milling the aluminum ingot into a surface, rolling the aluminum ingot into an aluminum foil plate with the thickness of 1.0mm by adopting a cold rolling mill with the pass reduction rate of 20%, and then carrying out complete recrystallization treatment.
The grain size, the electric conductivity and the heat conductivity of the aluminum foil plate are detected, the grain size is 28 mu m, and the resistivity is 2.869 multiplied by 10-8Ω · m, electrical conductivity 60.09% IACS, thermal conductivity 210.78W/K × m.
Example 3:
an Al-RE-B refiner, which comprises the following components in percentage by weight:
5.5 percent of rare earth,
0.9 percent of boron,
0.4 percent of other impurities,
the balance being aluminum.
The preparation method comprises the following steps:
1) the total weight of the refiner aluminum ingot is designed to be 1 kg, 79.64 g of industrial pure aluminum ingot is selected and melted in a shaft furnace, the melting temperature is 750 ℃, and 0.24 g of refining agent (comprising the following components: 20% of sodium chloride, 37% of potassium chloride, 8% of hexachloromethane, 5% of potassium fluoborate, 13% of sodium fluoroaluminate and 17% of charcoal powder), then blowing nitrogen gas, stirring for 3min, standing for 8min, and cleaning surface slag to obtain alloy liquid I;
2) adding 338.35 g of aluminum boron alloy (the boron content is 2.8 wt.%, and the burning loss rate is calculated as 5%) into the alloy liquid I until the alloy liquid I is completely melted, uniformly stirring, standing, purifying the aluminum melt, cleaning aluminum slag on the surface to obtain alloy liquid II, and keeping the temperature of the aluminum liquid at 760 ℃ in the process;
3) adding 582.01 g of aluminum-rare earth intermediate alloy (the content of rare earth is 10.5 wt.%, the burning loss rate is calculated by 10%) into the alloy liquid II, blowing nitrogen, stirring for 2min, standing for 3min, and cleaning aluminum slag on the surface to obtain alloy liquid III; sampling, and analyzing the content of the rare earth element and the content of the boron element in the alloy liquid III by using an inductively coupled plasma emission spectrometer, wherein the content of the rare earth element and the content of the boron element are 5.5 wt.%;
4) and standing for 4min, casting the alloy liquid III into an aluminum ingot by using an iron mold, and cooling to room temperature to obtain the refiner.
5) Treating industrial pure aluminum by using an aluminum ingot refiner formed by casting the alloy liquid III to obtain alloy liquid IV, and sampling to analyze the content of rare earth elements and the content of boron elements in the alloy to be 0.15 wt.% and 0.03 wt.% by using an inductively coupled plasma emission spectrometer;
6) and casting the alloy liquid IV into an aluminum ingot, milling the aluminum ingot into a surface, rolling the aluminum ingot into an aluminum foil plate with the thickness of 1.0mm by adopting a cold rolling mill with the pass reduction rate of 20%, and then carrying out complete recrystallization treatment.
The grain size, the electric conductivity and the heat conductivity of the aluminum foil plate are detected, the grain size is 24 mu m, and the resistivity is 2.838 multiplied by 10-8Ω · m, electrical conductivity 60.76% IACS, thermal conductivity 211.34W/K × m.
Example 4:
an Al-RE-B refiner, which comprises the following components in percentage by weight:
5.0 percent of rare earth,
1.0 percent of boron,
0.35 percent of other impurities,
the balance being aluminum.
The preparation method comprises the following steps:
1) the total weight of the refiner aluminum ingot is designed to be 1 kg, 93.57 g of industrial pure aluminum ingot is selected and melted in a shaft furnace, the melting temperature is 750 ℃, and 0.28 g of refining agent (comprising the following components: 20% of sodium chloride, 37% of potassium chloride, 8% of hexachloromethane, 5% of potassium fluoborate, 13% of sodium fluoroaluminate and 17% of charcoal powder), then blowing nitrogen gas, stirring for 3min, standing for 8min, and cleaning surface slag to obtain alloy liquid I;
2) adding 350.88 g of aluminum boron alloy (the boron content is 3.0 wt.%, and the burning loss rate is calculated as 5%) into the alloy liquid I until the alloy liquid I is completely melted, uniformly stirring, standing, purifying the aluminum melt, cleaning aluminum slag on the surface to obtain alloy liquid II, and keeping the temperature of the aluminum liquid at 750 ℃ in the process;
3) adding 555.56 g of aluminum-rare earth intermediate alloy (the content of rare earth is 10.0 wt.%, the burning loss rate is calculated by 10%) into the alloy liquid II, blowing nitrogen, stirring for 2min, standing for 3min, and cleaning aluminum slag on the surface to obtain alloy liquid III; sampling, and analyzing the content of the rare earth element and the content of the boron element in the alloy liquid III by using an inductively coupled plasma emission spectrometer, wherein the content of the rare earth element and the content of the boron element are 5.0 wt.%;
4) and standing for 4min, casting the alloy liquid III into an aluminum ingot by using an iron mold, and cooling to room temperature to obtain the refiner.
5) Treating industrial pure aluminum by using an aluminum ingot refiner formed by casting the alloy liquid III to obtain alloy liquid IV, and sampling to analyze the content of rare earth elements and the content of boron elements in the alloy to be 0.05 wt.% and 0.01 wt.% by using an inductively coupled plasma emission spectrometer;
6) and casting the alloy liquid IV into an aluminum ingot, milling the aluminum ingot into a surface, rolling the aluminum ingot into an aluminum foil plate with the thickness of 1.0mm by adopting a cold rolling mill with the pass reduction rate of 20%, and then carrying out complete recrystallization treatment.
Detection ofThe aluminum foil plate has the grain size of 28 microns, the electrical conductivity and the heat conductivity, and the resistivity of 2.870 multiplied by 10-8Ω · m, electrical conductivity 60.07% IACS, thermal conductivity 210.44W/K × m.
Example 5:
an Al-RE-B refiner, which comprises the following components in percentage by weight:
4.95 percent of rare earth,
0.95 percent of boron,
0.35 percent of other impurities,
the balance being aluminum.
The preparation method comprises the following steps:
1) the total weight of the refiner aluminum ingot is designed to be 1 kg, 116.67 g of industrial pure aluminum ingot is selected and melted in a shaft furnace, the melting temperature is 760 ℃, and 0.35 g of refining agent (comprising the following components: 20% of sodium chloride, 37% of potassium chloride, 8% of hexachloromethane, 5% of potassium fluoborate, 13% of sodium fluoroaluminate and 17% of charcoal powder), then blowing nitrogen gas, stirring for 3min, standing for 8min, and cleaning surface slag to obtain alloy liquid I;
2) 333.33 g of aluminum-boron alloy (the boron content is 3.0 wt.%, the burning loss rate is calculated as 5%) is added into the alloy liquid I until the alloy liquid I is completely melted, the mixture is stirred uniformly, kept stand, purified to obtain an aluminum melt, and aluminum slag on the surface is cleaned to obtain alloy liquid II, wherein the temperature of the aluminum liquid is kept at 750 ℃ in the process;
3) adding 550.00 g of aluminum-rare earth intermediate alloy (the content of rare earth is 10.0 wt.%, the burning loss rate is calculated by 10%) into the alloy liquid II, blowing nitrogen, stirring for 2min, standing for 3min, and cleaning aluminum slag on the surface to obtain alloy liquid III; sampling, and analyzing the content of rare earth elements in the alloy liquid III by using an inductively coupled plasma emission spectrometer to obtain 4.95 wt% and 0.95 wt% of boron elements;
4) and standing for 4min, casting the alloy liquid III into an aluminum ingot by using an iron mold, and cooling to room temperature to obtain the refiner.
5) Treating industrial pure aluminum by using an aluminum ingot refiner formed by casting the alloy liquid III to obtain alloy liquid IV, and sampling to analyze the content of rare earth elements and the content of boron elements in the alloy to be 0.11 wt.% and 0.02 wt.% by using an inductively coupled plasma emission spectrometer;
6) and casting the alloy liquid IV into an aluminum ingot, milling the aluminum ingot into a surface, rolling the aluminum ingot into an aluminum foil plate with the thickness of 1.0mm by adopting a cold rolling mill with the pass reduction rate of 20%, and then carrying out complete recrystallization treatment.
The grain size, the electric conductivity and the heat conductivity of the aluminum foil plate are detected, the grain size is 23 mu m, and the resistivity is 2.796 multiplied by 10-8Ω · m, electrical conductivity 61.67% IACS, thermal conductivity 215.63W/K × m.
The above embodiments are merely illustrative of the features and contents of the present invention, and the scope of the present invention is not limited thereto, and the contents of the claims of the present invention are subject to the claims. Any modification or variation made in accordance with the spirit of the present invention falls within the scope of the present invention.
Claims (9)
1. An Al-RE-B refiner for aluminum alloy foil is characterized by comprising the following components in percentage by weight: 4.5-5.5% of rare earth, 0.9-1.1% of boron, 0.3-0.5% of other impurities and the balance of aluminum.
2. The method of producing an Al-RE-B refiner for aluminum alloy foil according to claim 1, wherein: the method comprises the following steps:
1) weighing an industrial pure aluminum ingot, smelting, uniformly stirring after melting, adding a refining agent, standing, purifying an aluminum melt, and cleaning surface slag to obtain an alloy liquid I;
2) adding an aluminum-boron alloy into the alloy liquid I, stirring uniformly after melting, standing, purifying an aluminum melt, and cleaning aluminum slag on the surface to obtain an alloy liquid II;
3) adding an aluminum-rare earth intermediate alloy into the alloy liquid II, stirring uniformly after melting, keeping the temperature for 30-60 min, stirring to ensure full reaction, standing, purifying an aluminum melt, and cleaning aluminum slag on the surface to obtain alloy liquid III;
4) and casting the alloy liquid III into ingots, and cooling to room temperature to obtain the Al-RE-B refiner for the aluminum alloy foil.
3. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 1), the aluminum boron alloy contains 2.8-3.2 wt% of boron.
4. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 3), the content of rare earth in the aluminum-rare earth master alloy is 9.5-10.5 wt.%.
5. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 1), the temperature of the smelting process is 740-760 ℃.
6. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 2), the temperature of the alloy liquid II and the temperature of the alloy liquid III are kept at 740-760 ℃ in the process of preparing the alloy liquid II and preparing the alloy liquid III in the step 3).
7. The method of claim 2, wherein the Al-RE-B refiner comprises: the adding amount of the refining agent in the step 1) is 0.1-0.3% of the total mass of the alloy liquid I, and the refining agent comprises the following components in percentage by mass: 15-25% of sodium chloride, 30-40% of potassium chloride, 5-12% of hexachloromethane, 3-7% of potassium fluoborate, 12-16% of sodium fluoroaluminate and 10-20% of charcoal powder.
8. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 1), the step 2) and the step 3), stirring is carried out in a nitrogen or inert gas blowing mode in the stirring process, the stirring time is 2-3 min, and the standing time is 3-10 min.
9. The method of claim 2, wherein the Al-RE-B refiner comprises: in the step 4), a metal mold is adopted in the casting ingot forming process.
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| CN1485451A (en) * | 2002-09-28 | 2004-03-31 | 东南大学 | Composite grain refiner for aluminium, aluminum alloy and preparing process therefor |
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Application publication date: 20210727 |