High-temperature-resistant aluminum alloy material and preparation process thereof

Abstract

The invention discloses a high-temperature-resistant aluminum alloy material and a preparation technology thereof.The preparation technology comprises the following steps that S1, an aluminum alloy cast ingot is prepared through a fusion casting technology, and the aluminum alloy cast ingot comprises the Mg element, the Zr element, the Ti element and the Er element; s2, the aluminum alloy cast ingot is subjected to two times of homogenization treatment, and an aluminum alloy ingot is prepared; s3, the aluminum alloy ingot is put into an extrusion die to be extruded, and an aluminum alloy plate is prepared; and S4, a cold rolling machining process is conducted, and cold rolling is conducted till the deformation is larger than 70%. The Mg element is added, solid solution strengthening is achieved, and the strength is remarkably improved; by adding the Zr element, the Ti element and the Er element, a nano dispersed phase is formed, and the strength of the aluminum alloy, especially the strength in a high-temperature environment, is remarkably improved; and the Sr element is added to purify the aluminum alloy and improve the plasticity of the aluminum alloy. The total deformation of cold rolling is controlled to be greater than 70%, so that the strength of the high-temperature-resistant aluminum alloy material is improved. The prepared aluminum alloy material meets the requirements of organic capacitor raw materials at the high temperature of 450 DEG C.

Description

Technical Field

[0001] This invention relates to the field of metal materials technology, specifically to a high-temperature resistant aluminum alloy material and its preparation process. Background Technology

[0002] Aluminum alloys are widely used in aerospace, transportation, construction, and electronic equipment due to their lightweight, high strength, and good corrosion resistance. However, the yield strength of aluminum alloys on the market weakens significantly after being heated to 450 degrees Celsius for half an hour, failing to meet the requirements for raw materials in organic capacitors. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a high-temperature resistant aluminum alloy material and its preparation process, thereby solving the problem that the yield strength of aluminum alloys weakens significantly after being subjected to a high temperature of 450 degrees Celsius.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a preparation process for high-temperature resistant aluminum alloy materials, comprising the following steps:

[0005] S1. Prepare aluminum alloy ingots through a melting and casting process. The aluminum alloy ingots contain Mg, Zr, Ti and Er elements.

[0006] S2. The aluminum alloy ingot is homogenized twice to prepare the aluminum alloy ingot.

[0007] S3. Place the aluminum alloy ingot into the extrusion die for extrusion to prepare aluminum alloy sheet;

[0008] S4. Cold rolling process, cold rolling until the deformation is greater than 70%.

[0009] Furthermore, the casting process in S1 includes the following steps:

[0010] S11, molten Al ingot;

[0011] S12. Add the intermediate alloy and melt it completely.

[0012] S13, Refining; Filtration, degassing, and slag removal to remove impurities and gases from solutions;

[0013] S14. After standing, add Mg and Al-20%Er master alloy in sequence;

[0014] S15. Casting: The solution is poured into the mold and solidified to form an aluminum alloy ingot.

[0015] Furthermore, in S12, the master alloys include Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy.

[0016] Furthermore, the mass percentages of each component in the high-temperature resistant aluminum alloy material are as follows: Si 0.8-0.9 wt%, Fe 0.7-0.8 wt%, Cu 0.15-0.25 wt%, Mn 1.5-1.7 wt%, Mg 1.4-1.5 wt%, Ti 0.15-0.18 wt%, Sr 0.001-0.01 wt%, Zr 0.15-0.25 wt%, Er 0.05-0.15 wt%, unavoidable impurities ≤ 0.1 wt%, and the balance being Al.

[0017] Furthermore, in S2, the first homogenization treatment temperature is 300℃ and the treatment time is 12h; the second homogenization treatment temperature is 450℃ and the treatment time is 24h.

[0018] Furthermore, in S3, the extrusion temperature is 360°C and the extrusion ratio is >20:1.

[0019] Furthermore, in S4, the cold rolling process results in a deformation of 70% to 75%.

[0020] Further, in S3, the aluminum alloy ingot is placed into an extrusion die and extruded to 3.5mm to prepare an aluminum alloy sheet. In S4, the 3.5mm aluminum alloy sheet is cold rolled to 1mm.

[0021] A high-temperature resistant aluminum alloy material is prepared by the preparation process described above.

[0022] The beneficial effects of this invention are:

[0023] 1) By adding Mg to 3003 aluminum alloy, solid solution strengthening is achieved, which significantly improves the strength; by adding Zr, Ti and Er elements, a nano-dispersed phase is formed, which significantly improves the strength of the aluminum alloy, especially the strength in high-temperature environments; by adding Sr element, the aluminum alloy is purified and its plasticity is improved.

[0024] 2) By controlling the total cold rolling deformation to ≥70%, the strength of high-temperature resistant aluminum alloy materials can be improved.

[0025] 3) The high-temperature resistant aluminum alloy material prepared at 450°C exhibits a lateral deformation (deformation in the length or width direction) of less than 0.50mm. This ensures that the aluminum alloy material will not interfere with each other or even jump out of the frame due to excessive lateral deformation. In practice, the longitudinal deformation is close to zero. This perfectly meets the requirements for aluminum alloy materials in organic capacitors.

[0026] The longitudinal deformation (deformation in the thickness direction) is less than 0.03 mm, ensuring that the aluminum alloy material will not have uneven impregnation depth of organic capacitors due to excessive deformation in the longitudinal direction, thus affecting the capacitance value and other characteristics of the organic capacitors. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Unless otherwise shown or indicated in the operational embodiments, all figures used to represent the amounts, physicochemical properties, etc., of ingredients in the specification and claims are to be understood to be adjusted by the term "about" in all cases. Therefore, unless stated to the contrary, the numerical parameters listed in the foregoing specification and appended claims are approximations, and those skilled in the art can appropriately modify these approximations to obtain the desired characteristics by utilizing the teachings disclosed herein. The use of numerical ranges indicated by endpoints includes all numbers within that range and any range within that range; for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, etc.

[0029] A process for preparing a high-temperature resistant aluminum alloy material includes the following steps:

[0030] S1, casting process

[0031] The casting process is used to lock alloying elements into aluminum, expel impurities and gases from the aluminum, and leave uniform and fine microstructure inside the aluminum, ultimately producing an aluminum alloy billet that meets the five requirements of composition, microstructure, defects, size, and energy consumption.

[0032] The casting process specifically includes the following steps:

[0033] S11, molten Al ingot;

[0034] S12. Add the master alloy and fully melt it. The master alloys include Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy. The Al-20%Si master alloy refers to a master alloy in which Si constitutes 20% by mass, with the remainder being Al. The Al-5%Ti-1%B master alloy refers to a master alloy in which Ti constitutes 5% by mass, B constitutes 1% by mass, and the remainder is Al. The numbers in the other master alloys also represent mass percentages and will not be elaborated further.

[0035] S13. Refining: Removing impurities and gases from the solution through filtration, degassing, and slag removal to improve the quality of castings.

[0036] S14. After standing, add Mg and Al-20%Er master alloy in sequence;

[0037] S15. Casting: The solution is poured into a mold, and after solidification, it forms an aluminum alloy ingot.

[0038] In the aluminum alloy ingot, the mass percentages of each component are as follows: Si 0.8-0.9 wt%, Fe 0.7-0.8 wt%, Cu 0.15-0.25 wt%, Mn 1.5-1.7 wt%, Mg 1.4-1.5 wt%, Ti 0.15-0.18 wt%, Sr 0.001-0.01 wt%, Zr 0.15-0.25 wt%, Er 0.05-0.15 wt%, unavoidable impurities ≤0.1 wt%, and the balance is Al.

[0039] Based on the upper limit composition of 3003 aluminum alloy (Al-0.6Si-0.7Fe-0.2Cu-1.5Mn), Mg element is added for solid solution strengthening to significantly improve the strength of aluminum alloy; Zr, Ti and Er elements are added to form nano-dispersed phases, which significantly improve the strength of aluminum alloy, especially the strength of aluminum alloy under high temperature environment; Sr element is added to purify aluminum alloy and improve the plasticity of aluminum alloy.

[0040] S2. Homogenization treatment: The aluminum alloy ingot containing the above component ratio is subjected to a first homogenization treatment and a second homogenization treatment with gradually increasing temperature.

[0041] In the first homogenization process, the temperature was 300℃ and the time was 12 hours.

[0042] In the second homogenization process, the processing temperature was 450℃ and the processing time was 24 hours.

[0043] During the homogenization process, the processing temperature and time in the two homogenization steps are precisely limited, which ensures that the homogenization process in each stage is carried out at an appropriate temperature and duration, thereby achieving a better homogenization effect. This maximizes the effect of the added Mg, Zr, Ti, and Er elements, and thus better improves the strength of the alloy.

[0044] S3, Extrusion Process

[0045] Aluminum alloy ingots are placed into an extrusion die and extruded into aluminum alloy sheets. The extrusion temperature is 360℃ and the extrusion ratio is ≥20:1.

[0046] S4. Cold rolling process, cold rolling to a deformation of 70% to 75%, to prepare high-temperature resistant aluminum alloy materials.

[0047] At room temperature, aluminum alloy sheets are cold rolled with a reduction of 0.4 mm per pass. The total deformation during cold rolling is controlled between 70% and 75%. Studies have found that when the deformation is less than 70%, the tensile strength of the product does not meet the requirements, and when the deformation is greater than 75%, the surface of the product is uneven and prone to cracking.

[0048] S5, stamping, cleaning

[0049] Based on the dimensions and specifications of the organic capacitor raw materials, a mold is designed to stamp out the raw materials. The stamped organic capacitor raw materials are then cleaned to avoid affecting the subsequent impregnation of the organic capacitors.

[0050] After being subjected to a high temperature of 450°C, the high-temperature resistant aluminum alloy material prepared at this temperature exhibits a lateral deformation (deformation in the length or width direction) of less than 0.50 mm. This ensures that excessive lateral deformation will not cause interference between aluminum alloy components or even cause them to jump out of the frame. The actual effect is that the longitudinal deformation is close to zero. This perfectly meets the requirements for organic capacitor aluminum alloy materials. The longitudinal deformation (deformation in the thickness direction) is less than 0.03 mm, ensuring that excessive longitudinal deformation will not lead to uneven impregnation depth of the organic capacitors on the aluminum alloy material, thus affecting the capacitance and other characteristics of the organic capacitors.

[0051] Example

[0052] The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized by conventional methods and can be used directly without further processing. The instruments used in the examples are also commercially available.

[0053] Example 1

[0054] A process for preparing a high-temperature resistant aluminum alloy material includes the following steps:

[0055] S1, casting process

[0056] The casting process is used to lock alloying elements into aluminum, expel impurities and gases from the aluminum, and leave uniform and fine microstructure inside the aluminum, ultimately producing an aluminum alloy billet that meets the five requirements of composition, microstructure, defects, size, and energy consumption.

[0057] The casting process specifically includes the following steps:

[0058] S11, molten Al ingot;

[0059] S12. Add the master alloy and fully melt it. The master alloy includes Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy.

[0060] S13. Refining: Removing impurities and gases from the solution through filtration, degassing, and slag removal to improve the quality of castings.

[0061] S14. After standing, add Mg and Al-20%Er master alloy in sequence;

[0062] S15. Casting: The solution is poured into a mold, and after solidification, it forms an aluminum alloy ingot.

[0063] In the casting, the mass percentages of each component are as follows: Si 0.8wt%, Fe 0.8wt%, Cu 0.2wt%, Mn 1.6wt%, Mg 1.4wt%, Ti 0.16wt%, Sr 0.01wt%, Zr 0.2wt%, Er 0.1wt%, unavoidable impurities 0.1wt%, and the balance is Al.

[0064] S2. Homogenization treatment: The aluminum alloy ingot containing the above component ratio is subjected to a first homogenization treatment and a second homogenization treatment with gradually increasing temperature.

[0065] In the first homogenization process, the temperature was 300℃ and the time was 12 hours.

[0066] In the second homogenization process, the processing temperature was 450℃ and the processing time was 24 hours.

[0067] S3, Extrusion Process

[0068] An aluminum alloy ingot is placed into an extrusion die and extruded into an aluminum alloy sheet. The aluminum alloy sheet is 3.5mm thick. The extrusion temperature is 360℃ and the extrusion ratio is 25:1.

[0069] S4. Cold rolling process, with a reduction of 0.4mm per pass, cold rolls the 3.5mm thick aluminum alloy sheet to 1mm, with a deformation of 71.4%, to prepare high-temperature resistant aluminum alloy material.

[0070] S5, stamping, cleaning

[0071] Based on the dimensions and specifications of the organic capacitor raw materials, a mold is designed to stamp out the raw materials. The stamped organic capacitor raw materials are then cleaned to avoid affecting the subsequent impregnation of the organic capacitors.

[0072] The deformation of the prepared high-temperature resistant aluminum alloy material was tested. After half an hour at 450°C, the deformation of the high-temperature resistant aluminum alloy material in the transverse direction was 0.4 mm and the deformation in the longitudinal direction was 0.02 mm. The deformation of the aluminum alloy material in both the longitudinal and transverse directions met the requirements, ensuring the impregnation of the organic capacitor product in the most important formation stage, thereby ensuring the capacitance and other characteristics of the organic capacitor.

[0073] Example 2

[0074] A process for preparing a high-temperature resistant aluminum alloy material includes the following steps:

[0075] S1, casting process

[0076] S11, molten Al ingot;

[0077] S12. Add the master alloy and fully melt it. The master alloy includes Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy.

[0078] S13. Refining: Removing impurities and gases from the solution through filtration, degassing, and slag removal to improve the quality of castings.

[0079] S14. After standing, add Mg and Al-20%Er master alloy in sequence;

[0080] S15. Casting: The solution is poured into a mold, and after solidification, it forms an aluminum alloy ingot.

[0081] The mass percentages of each component in the casting are as follows: Si 0.9 wt%, Fe 0.8 wt%, Cu 0.25 wt%, Mn 1.7 wt%, Mg 1.5 wt%, Ti 0.18 wt%, Sr 0.01 wt%, Zr 0.25 wt%, Er 0.15 wt%, unavoidable impurities 0.08 wt%, and the balance is Al.

[0082] S2. Homogenization treatment: The aluminum alloy ingot containing the above component ratio is subjected to a first homogenization treatment and a second homogenization treatment with gradually increasing temperature.

[0083] In the first homogenization process, the temperature was 300℃ and the time was 12 hours.

[0084] In the second homogenization process, the processing temperature was 450℃ and the processing time was 24 hours.

[0085] S3, Extrusion Process

[0086] Aluminum alloy ingots are placed into an extrusion die and extruded into aluminum alloy sheets. The extrusion temperature is 360℃ and the extrusion ratio is 30:1.

[0087] S4. Cold rolling process, with a reduction of 0.4mm per pass, cold rolling to a deformation of 70%, to prepare high-temperature resistant aluminum alloy material.

[0088] S5, stamping, cleaning

[0089] Based on the dimensions and specifications of the organic capacitor raw materials, a mold is designed to stamp out the raw materials. The stamped organic capacitor raw materials are then cleaned to avoid affecting the subsequent impregnation of the organic capacitors.

[0090] The deformation of the prepared high-temperature resistant aluminum alloy material was tested. After half an hour at 450°C, the deformation of the high-temperature resistant aluminum alloy material in the transverse direction was 0.5 mm and the deformation in the longitudinal direction was 0.025 mm. The deformation of the aluminum alloy material in both the longitudinal and transverse directions met the requirements, ensuring the impregnation of the organic capacitor product in the most important formation stage, thereby ensuring the capacitance and other characteristics of the organic capacitor.

[0091] Example 3

[0092] A process for preparing a high-temperature resistant aluminum alloy material includes the following steps:

[0093] S1, casting process

[0094] S11, molten Al ingot;

[0095] S12. Add the master alloy and fully melt it. The master alloy includes Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy.

[0096] S13. Refining: Removing impurities and gases from the solution through filtration, degassing, and slag removal to improve the quality of castings.

[0097] S14. After standing, add Mg and Al-20%Er master alloy in sequence;

[0098] S15. Casting: The solution is poured into a mold, and after solidification, it forms an aluminum alloy ingot.

[0099] The mass percentages of each component in the casting are as follows: Si 0.9 wt%, Fe 0.8 wt%, Cu 0.25 wt%, Mn 1.7 wt%, Mg 1.5 wt%, Ti 0.18 wt%, Sr 0.01 wt%, Zr 0.25 wt%, Er 0.15 wt%, unavoidable impurities 0.05 wt%, and the balance is Al.

[0100] S2. Homogenization treatment: The aluminum alloy ingot containing the above component ratio is subjected to a first homogenization treatment and a second homogenization treatment with gradually increasing temperature.

[0101] In the first homogenization process, the temperature was 300℃ and the time was 12 hours.

[0102] In the second homogenization process, the processing temperature was 450℃ and the processing time was 24 hours.

[0103] S3, Extrusion Process

[0104] Aluminum alloy ingots are placed into an extrusion die and extruded into aluminum alloy sheets. The extrusion temperature is 360℃ and the extrusion ratio is 20:1.

[0105] S4. Cold rolling process, with a reduction of 0.4mm per pass, cold rolling to a deformation of 75%, to prepare high-temperature resistant aluminum alloy material.

[0106] S5, stamping, cleaning

[0107] Based on the dimensions and specifications of the organic capacitor raw materials, a mold is designed to stamp out the raw materials. The stamped organic capacitor raw materials are then cleaned to avoid affecting the subsequent impregnation of the organic capacitors.

[0108] The deformation of the prepared high-temperature resistant aluminum alloy material was tested. After half an hour at 450°C, the deformation of the high-temperature resistant aluminum alloy material in the transverse direction was 0.3 mm and the deformation in the longitudinal direction was 0.01 mm. The deformation of the aluminum alloy material in both the longitudinal and transverse directions met the requirements, ensuring the impregnation of the organic capacitor product in the most important formation stage, thereby ensuring the capacitance and other characteristics of the organic capacitor.

[0109] This invention illustrates the detailed process equipment and process flow through the above embodiments. However, this invention is not limited to the detailed process equipment and process flow described above, meaning that this invention does not necessarily depend on the detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, structural changes, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

[0110] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0111] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A preparation process for a high-temperature resistant aluminum alloy material, characterized in that, Includes the following steps: S1. Prepare aluminum alloy ingots through a melting and casting process. The aluminum alloy ingots contain Mg, Zr, Ti and Er elements. S2. The aluminum alloy ingot is homogenized twice to prepare the aluminum alloy ingot. S3. Place the aluminum alloy ingot into the extrusion die for extrusion to prepare aluminum alloy sheet; S4. High-temperature resistant aluminum alloy materials are prepared by cold rolling process, with the deformation amount not less than 70%.

2. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, The casting process in S1 includes the following steps: S11, molten Al ingot; S12. Add the intermediate alloy and melt it completely. S13, Refining; Filtration, degassing, and slag removal to remove impurities and gases from solutions; S14. After standing, add Mg and Al-20%Er master alloy in sequence; S15. Casting: The solution is poured into the mold and solidified to form an aluminum alloy ingot.

3. The preparation process of the high-temperature resistant aluminum alloy material according to claim 2, characterized in that, In S12, the master alloys include Al-20%Si master alloy, Al-4%Zr master alloy, Al-10%Sr master alloy, Al-5%Ti-1%B master alloy, Al-50%Cu master alloy, Al-10%Fe master alloy, and Al-20%Mn master alloy.

4. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, The mass percentages of each component in the high-temperature resistant aluminum alloy material are as follows: Si 0.8-0.9 wt%, Fe 0.7-0.8 wt%, Cu 0.15-0.25 wt%, Mn 1.5-1.7 wt%, Mg 1.4-1.5 wt%, Ti 0.15-0.18 wt%, Sr 0.001-0.01 wt%, Zr 0.15-0.25 wt%, Er 0.05-0.15 wt%, unavoidable impurities ≤0.1 wt%, and the balance is Al.

5. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, In S2, the first homogenization treatment temperature is 300℃ and the treatment time is 12h; the second homogenization treatment temperature is 450℃ and the treatment time is 24h.

6. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, In S3, the extrusion temperature is 360℃ and the extrusion ratio is ≥20:

1.

7. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, In S4, cold rolling results in a deformation of 70% to 75%.

8. The preparation process of the high-temperature resistant aluminum alloy material according to claim 1, characterized in that, S3. The aluminum alloy ingot is placed into the extrusion die and extruded to 3.5mm to prepare an aluminum alloy sheet; in S4, the 3.5mm aluminum alloy sheet is cold rolled to 1mm.

9. A high-temperature resistant aluminum alloy material, characterized in that, It is prepared by the preparation process described in any one of claims 1-8.