A method for preparing high thermal conductivity alloy with 6-series aluminum alloy

Abstract

The application relates to the field of aluminum alloys, in particular to a method for preparing a high-thermal-conductivity alloy from a 6-series aluminum alloy. The method for preparing the high-thermal-conductivity alloy from the 6-series aluminum alloy comprises the following steps: taking a 6-series aluminum alloy as a base material, melting to obtain an aluminum alloy melt; mixing the aluminum alloy melt and a metal intermediate to obtain a mixed melt; and performing casting forming on the mixed melt; and the components of the metal intermediate include Si, Fe, Cu, Mn, Mg, Cr, Ni, Zn, Sb, Sr, P and Al. By controlling the adding amount of the metal intermediate, only the steps of adding the metal intermediate and electromagnetic stirring need to be added in the existing production process of the 6-series aluminum alloy, so that the thermal conductivity is improved, the mechanical properties and the easy-to-process characteristics of the 6-series aluminum are maintained, the process window is wide, the operation is simple, and industrial large-scale production is easy to realize.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloys, and more particularly to a method for preparing high thermal conductivity alloys from 6-series aluminum alloys. Background Technology

[0002] Aluminum alloys are widely used in electronic heat dissipation, communication equipment, new energy vehicles, and power electronics due to their low density, good thermal conductivity, and strong comprehensive mechanical properties. Among them, 6-series aluminum alloys (Al-Mg-Si alloys), such as 6061 and 6063, combine high thermal conductivity, good strength, and corrosion resistance, making them one of the commonly used materials for thermal management structural components.

[0003] However, with the continuous increase in power density of electronic devices and the trend towards miniaturization and integration of equipment, the requirements for the thermal conductivity of materials are becoming increasingly stringent. While existing 6-series aluminum alloys have higher thermal conductivity than die-cast aluminum alloys, their thermal conductivity still falls short of the demands of high-end heat dissipation applications. Currently, methods to improve the thermal conductivity of aluminum alloys typically involve increasing material purity or reducing the content of alloying elements. However, these methods often lead to a decrease in material strength, making it difficult to meet the mechanical performance requirements of structural components. In addition, there are studies on improving thermal conductivity through heat treatment or microstructure control, but the improvement is limited, and the processes are complex, making it difficult to balance cost and the needs of large-scale production.

[0004] Therefore, under the premise of ensuring the mechanical and processing properties of 6-series aluminum alloys, how to reduce the adverse effects of microstructure on heat conduction through reasonable composition design and microstructure control, and further improve its thermal conductivity, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This invention provides a method for preparing high thermal conductivity alloys from 6-series aluminum alloys, thereby improving the thermal conductivity of 6-series aluminum alloys while ensuring their mechanical and processing properties.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a method for preparing high thermal conductivity alloys from 6-series aluminum alloys, characterized by comprising the following steps: Aluminum alloy melt is obtained by smelting 6-series aluminum alloy as the base material. The aluminum alloy melt and the metal intermediate are mixed to obtain a mixed melt; The mixed melt is then cast into shape; The metallic intermediate is composed of the following components by mass percentage: Si 0.2~0.5%, Fe 0.1~0.3%, Cu 0.007~0.01%, Mn 0.005~0.015%, Mg 0.01~0.03%, Cr 0.005~0.015%, Ni 0.005~0.015%, Zn 0.05~0.15%, Sb 0.0001~0.0002%, Sr 0.003~0.005%, P 0.0001~0.0005%, and Al balance.

[0007] Preferably, the 6-series aluminum alloy is 6061 aluminum alloy, 6063 aluminum alloy, 6005 aluminum alloy, 6082 aluminum alloy, 6060 aluminum alloy or 6070 aluminum alloy.

[0008] Preferably, the metal intermediate consists of the following components by mass percentage: Si 0.3%, Fe 0.2%, Cu 0.009%, Mn 0.01%, Mg 0.02%, Cr 0.01%, Ni 0.01%, Zn 0.1%, Sb 0.0001%, Sr 0.005%, P 0.0003%, and Al balance.

[0009] Preferably, the melting temperature is 750~850℃ and the melting time is 20~30min.

[0010] Preferably, the mass ratio of the aluminum alloy melt to the metal intermediate is 10:(1~3).

[0011] Preferably, the casting temperature is 730~750℃.

[0012] Preferably, the mixing method is electromagnetic stirring.

[0013] Preferably, the process after casting and molding further includes cooling and unloading.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) By adding specific metal intermediates to the 6-series aluminum alloy matrix and combining them with electromagnetic stirring, the microstructure of the alloy can be effectively controlled. Among them, the addition of elements such as Sr and Sb can control the grain morphology and size of the aluminum alloy, transforming it from fine particles or plate-like structures into smooth bulk materials, increasing the grain size, thereby significantly reducing the scattering of electrons and phonons. This results in an improvement in the thermal conductivity of the aluminum alloy material prepared by the method of this invention, greatly expanding its application prospects.

[0015] (2) By precisely controlling the amount and composition of the metal intermediates, this invention improves the thermal conductivity while only requiring the addition of metal intermediates and electromagnetic stirring steps in the existing 6-series aluminum alloy production process. The process window is wide, the operation is simple, and it is easy to achieve large-scale industrial production. Attached Figure Description

[0016] The above and other objects, features, and advantages of the invention will be apparent from the following description of preferred embodiments illustrating the gist of the invention and its use, and the accompanying drawings, in which: Figure 1 This is a scanning electron microscope image of the 6061 aluminum alloy in Example 1.

[0017] Figure 2 This is a scanning electron microscope image of the sample obtained by cooling and discharging in Example 1. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. The embodiments of this application are only examples, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 Using as-cast 6061 aluminum alloy as the base material, the alloy melt was obtained by melting at 750℃ for 25 minutes. The aluminum alloy melt and the metal intermediate were mixed at a mass ratio of 10:1 and electromagnetically stirred to obtain a mixed melt. The mixed melt is cast into shape at 740°C, and then cooled and discharged. The metallic intermediate is composed of the following components by mass percentage: Si 0.3%, Fe 0.2%, Cu 0.009%, Mn 0.01%, Mg 0.02%, Cr 0.01%, Ni 0.01%, Zn 0.1%, Sb 0.0001%, Sr 0.005%, P 0.0003%, and Al balance.

[0020] The sample obtained from the cooling discharge in Example 1 was tested and found to have a thermal conductivity of 250.63 W / m·K, a tensile strength of 243.28 MPa (test standard GB / T 228.1-2021), an elongation at break of 28.47% (test standard GB / T 228.1-2021), and an impact strength of 21.53 J / cm². 2 (Testing standard GB / T 229-2020).

[0021] Figure 1This is a scanning electron microscope image of the 6061 aluminum alloy in Example 1.

[0022] Figure 2 This is a scanning electron microscope image of the sample obtained by cooling and discharging in Example 1.

[0023] Example 2 Using as-cast 6063 aluminum alloy as the base material, the aluminum alloy melt was obtained by melting at 750℃ for 25 minutes. The aluminum alloy melt and the metal intermediate were mixed at a mass ratio of 10:1 and electromagnetically stirred to obtain a mixed melt. The mixed melt is cast into shape at 740°C, and then cooled and discharged. The metallic intermediate is composed of the following components by mass percentage: Si 0.4%, Fe 0.25%, Cu 0.009%, Mn 0.01%, Mg 0.02%, Cr 0.01%, Ni 0.01%, Zn 0.1%, Sb 0.0001%, Sr 0.005%, P 0.00035%, and Al balance.

[0024] The sample obtained from the cooling discharge in Example 2 was tested and found to have a thermal conductivity of 265.12 W / m·K, a tensile strength of 231.19 MPa (test standard GB / T 228.1-2021), an elongation at break of 22.08% (test standard GB / T 228.1-2021), and an impact strength of 24.81 J / cm². 2 (Testing standard GB / T 229-2020).

[0025] Example 3 Using as-cast 6005 aluminum alloy as the base material, the alloy melt was obtained by melting at 750℃ for 25 minutes. The aluminum alloy melt and the metal intermediate were mixed at a mass ratio of 10:1 and electromagnetically stirred to obtain a mixed melt. The mixed melt is cast into shape at 740°C, and then cooled and discharged. The metallic intermediate is composed of the following components by mass percentage: Si 0.2%, Fe 0.1%, Cu 0.009%, Mn 0.01%, Mg 0.02%, Cr 0.01%, Ni 0.01%, Zn 0.1%, Sb 0.00015%, Sr 0.004%, P 0.0003% and Al balance.

[0026] The sample obtained from the cooling discharge in Example 3 was tested and found to have a thermal conductivity of 240.59 W / m·K, a tensile strength of 252.79 MPa (test standard GB / T 228.1-2021), an elongation at break of 26.34% (test standard GB / T 228.1-2021), and an impact strength of 21.73 J / cm². 2 (Testing standard GB / T 229-2020).

[0027] Although preferred embodiments of the invention have been shown and described, it is conceivable that those skilled in the art can devise various modifications to the invention within the spirit and scope of the appended claims.

Claims

1. A method for preparing a high thermal conductivity alloy from 6-series aluminum alloys, characterized in that, Includes the following steps: Aluminum alloy melt is obtained by smelting 6-series aluminum alloy as the base material. The aluminum alloy melt and the metal intermediate are mixed to obtain a mixed melt; The mixed melt is then cast into shape; The metallic intermediate is composed of the following components by mass percentage: Si 0.2~0.5%, Fe 0.1~0.3%, Cu 0.007~0.01%, Mn 0.005~0.015%, Mg 0.01~0.03%, Cr 0.005~0.015%, Ni 0.005~0.015%, Zn 0.05~0.15%, Sb 0.0001~0.0002%, Sr 0.003~0.005%, P 0.0001~0.0005%, and Al balance.

2. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The metallic intermediate is composed of the following components by mass percentage: Si 0.3%, Fe 0.2%, Cu 0.009%, Mn 0.01%, Mg 0.02%, Cr 0.01%, Ni 0.01%, Zn 0.1%, Sb 0.0001%, Sr 0.005%, P 0.0003%, and Al balance.

3. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The melting temperature is 750~850℃, and the melting time is 20~30min.

4. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The mass ratio of the aluminum alloy melt to the metal intermediate is 10:(1~3).

5. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The casting temperature is 730~750℃.

6. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The mixing method is electromagnetic stirring.

7. The method for preparing high thermal conductivity alloys from 6-series aluminum alloys according to claim 1, characterized in that, The process after casting also includes cooling and unloading.

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