Ultra-high thermal conductivity aluminum alloy and its preparation method

Abstract

The present invention discloses a super high thermal conductivity aluminum alloy, and the weight percentages of its component composition are as follows: nickel is 2-5%, carbon in aluminum titanium carbon is 0.1%-0.5%, titanium is 0.01-0.2%, iron is below 0.1%, silicon is below 0.1%, and the content of each of the elements of copper, zinc, manganese, magnesium, chromium, lead, and tin is below 0.01%. M is to limit other elements, and the content of each item is below 0.005%, and the balance is aluminum; the preparation method is to preheat the crucible furnace to above 500°C, melt pure aluminum ingots, the molten metal temperature reaches 720°C, carry out refining and slag removal, after completion, raise the temperature to 750°C, add the main element nickel, control the melting temperature at 750-810°C, after sampling and analyzing to confirm that the nickel composition is correct, add aluminum titanium carbon, after confirming that the aluminum titanium carbon is completely melted, carry out degassing for about 5-10 minutes, after completion, let it stand for about 10 minutes, sample for component determination, and then cast aluminum ingots.

Description

Technical Field

[0001] The present invention relates to a super-high thermal conductivity aluminum alloy and a preparation method thereof, and particularly to an aluminum alloy belonging to the manufacturing field for industrial use. Background Art

[0002] Aluminum alloy ingots are made of pure aluminum and recycled aluminum, and other elements such as silicon (Si), magnesium (Mg), iron (Fe), etc. are added according to international standards or special requirements to improve the deficiencies of pure aluminum in terms of castability, chemical properties, and physical properties. The formulated alloy is generally used in the casting industry.

[0003] With the rapid development of science and technology, the performance requirements and precision of equipment are getting higher and higher. Precision equipment is accompanied by demanding operating environment requirements. Temperature control is an important link to ensure the operation of equipment. The temperature control of most equipment is inseparable from radiators. However, if a radiator wants to improve its heat dissipation performance, in addition to changing the structure, the most fundamental thing is to improve the heat dissipation performance of the material used to prepare the radiator. Therefore, a more reasonable preparation method is needed to prepare high-quality heat dissipation materials that can be formed and processed, which can meet the equipment configuration with higher heat generation, and provide guarantee for improving the integration degree and reducing the volume of various equipment. However, in actual production, the current aluminum alloy materials have poor thermal conductivity. Summary of the Invention

[0004] The main purpose of the present invention is to provide a super-high thermal conductivity aluminum alloy and a preparation method thereof, which are used for aluminum alloy products for manufacturing parts with super-high heat conduction requirements, and can meet the requirements of special industries for the thermal conductivity of aluminum alloy materials.

[0005] The super-high thermal conductivity aluminum alloy of the present invention is mainly composed of aluminum, nickel, and aluminum titanium carbon. The weight percentages of its components are as follows: nickel is 2-5%, carbon in aluminum titanium carbon is 0.1%-0.5%, titanium is 0.01-0.2%, iron is below 0.1%, silicon is below 0.1%, and the content of each element of copper, zinc, manganese, magnesium, chromium, lead, and tin is below 0.01%; M is to limit other elements, and the content of each item is below 0.005%; the balance is aluminum, and the sum of the weight percentages of the above components is 100%.

[0006] For the super-high thermal conductivity aluminum alloy of the present invention, preferably, the weight percentage of the aluminum component is greater than 94%.

[0007] The preparation method of the super-high thermal conductivity aluminum alloy of the present invention is as follows:

[0008] Preheat the crucible furnace to above 500°C;

[0009] Put pure aluminum ingots into the furnace for melting. When the molten metal temperature reaches 720 °C, carry out refining to remove slag. After completion, raise the temperature to 750 °C, add the main element nickel, and control the melting temperature at 750 - 810 °C. After sufficient stirring, confirm that the nickel has melted completely, then take a sample for component analysis. After confirming that the nickel component is correct, add aluminum-titanium-carbon, stir and confirm that the aluminum-titanium-carbon has melted completely, then use a rotary degassing device for degassing. The degassing process takes about 5 - 10 minutes. After completion, let it stand for about 10 minutes, take a sample for component determination. The final component determination must meet the specified conditions, and then carry out casting of aluminum ingots.

[0010] The ultra-high thermal conductivity aluminum alloy of the present invention and its preparation method have the following advantages: The ultra-high thermal conductivity aluminum alloy of the present invention combines high-temperature strength and electrical conductivity, creating an aluminum alloy that is easy to form and process, and under the condition of not undergoing heat treatment, the thermal conductivity of the aluminum alloy is close to that of pure aluminum and can be as high as more than 230 W / mK, with very excellent heat dissipation effect. It can be applied to production methods such as aluminum alloy die casting and aluminum alloy casting. Its products can be used in parts with high heat dissipation and high thermal conductivity requirements, such as 3C electronic parts, 5G communication equipment, automotive electronic parts, motor rotors, aerospace / satellite communication, etc. Brief Description of the Drawings

[0011] Figure 1 The following shows the flow chart of the preparation method of the embodiment of the present invention.

[0012] Figure 2 The following shows the metallographic microstructural diagram of the aluminum alloy with 2.5% nickel added according to the present invention.

[0013] Figure 3 The following shows the metallographic microstructural diagram of the aluminum alloy with 2.5% nickel and aluminum-titanium-carbon added according to the present invention.

[0014] Figure 4 The following shows the metallographic microstructural diagram of the aluminum alloy with 3.3% nickel and aluminum-titanium-carbon added according to the present invention.

[0015] Figure 5 The following shows the metallographic microstructural diagram of the aluminum alloy with 3.5% nickel and aluminum-titanium-carbon added according to the present invention.

[0016] Figure 6 The following shows the metallographic microstructural diagram of the aluminum alloy with 5% nickel added according to the present invention. Detailed Description of the Embodiment

[0017] Regarding the technical means adopted by the present invention to achieve the above-mentioned usage purposes and effects, the following gives preferred and feasible embodiments, and in conjunction with the diagrams shown, it is described in detail as follows:

[0018] The preparation method of the ultra-high thermal conductivity aluminum alloy of the present invention is as follows by referring to Figure 1 as shown below:

[0019] Preheat the crucible furnace to above 500℃;

[0020] Pure aluminum ingots are put into smelting, and the molten soup temperature reaches 720℃. Refining and slag removal are carried out. After completion, the temperature is raised to 750℃, and the main element nickel (Ni) is added. The smelting temperature is controlled at 750-810℃. After sufficient stirring, it is confirmed that the nickel has been melted. Samples are taken for component analysis. After confirming that the nickel composition is correct, aluminum titanium carbon (AlTiC) is added, stirred and confirmed that the aluminum titanium carbon has been melted. Degassing is carried out with a rotary degassing device. The degassing process takes about 5-10 minutes. After completion, it is left to stand for about 10 minutes, and samples are taken for component determination. The final component determination must meet the specified conditions (as shown in Table 1) before casting aluminum ingots.

[0021]

[0022] The ultra-high thermal conductivity aluminum alloy of the present invention mainly consists of aluminum (Al), nickel (Ni), and aluminum titanium carbon (AlTiC), and the weight percentages of the components are as follows: nickel is 2-5%, carbon (C) of aluminum titanium carbon is 0.1%-0.5%, titanium (Ti) is 0.01-0.2%, iron (Fe) is less than 0.1%, silicon (Si) is less than 0.1%, and the content of each of copper (Cu), zinc (Zn), manganese (Mn), magnesium (Mg), chromium (Cr), lead (Pb), and tin (Sn) is less than 0.01%; M is limited to other elements (such as silver Ag, boron B, beryllium Be, calcium Ca, cadmium Cd, cobalt Co, gallium Ga, mercury Hg, indium In, sodium Na, strontium Sr, etc.), and the content of each item is less than 0.005%; the balance Al is greater than 94%.

[0023] The metallographic structures formed by adding different proportions of nickel and aluminum-titanium-carbon to the aluminum alloy are different. Figure 2 The metallographic microstructure of the present invention with 2.5% nickel added is examined through a microscope. Figure 3 The metallographic microstructure of the present invention with 2.5% nickel and aluminum titanium carbon is examined through a microscope. Figure 4 The metallographic microstructure of the present invention by adding 3.3% nickel and aluminum titanium carbon through a microscope is shown. Figure 5 The metallographic microstructure of the present invention by adding 3.5% nickel and aluminum titanium carbon through a microscope is shown. Figure 6 The metallographic microstructure of the present invention with 5% nickel added is observed through a microscope.

[0024] The thermal conductivity and tensile test results of the aluminum alloys made according to the present invention with different addition amounts of nickel (Ni) are shown in Table 2:

[0025]

[0026] The ultra-high thermal conductivity aluminum alloy of the present invention has electrical conductivity and thermal conductivity close to that of pure aluminum ingots, which is beneficial to aluminum alloy die casting / aluminum alloy casting molding, and has characteristics such as easy processing of cast products.

[0027] In summary, the present invention has indeed achieved the intended use purpose and efficacy, and is more ideal and practical than the known ones. The above embodiments are only specific descriptions of the preferred embodiments of the present invention, and these embodiments are not used to limit the protection scope of the present invention. For example, all equal changes and modifications completed under the technical means disclosed by the present invention should be included in the patent protection scope covered by the present invention.

Claims

1. A super-high heat-conducting aluminum alloy, characterized in that, Its raw materials are composed of aluminum, nickel, aluminum-titanium-carbon. Calculated by weight percentage of the ultra-high heat conduction aluminum alloy, its composition is as follows: nickel is 2-5%, carbon is 0.1%-0.5%, titanium is 0.01-0.2%, iron is below 0.1%, silicon is below 0.1%, and the content of each element of copper, zinc, manganese, magnesium, chromium, lead, and tin is below 0.01%; other elements are restricted. The restricted other elements include silver, boron, beryllium, calcium, cadmium, cobalt, gallium, mercury, indium, sodium, and strontium, and the content of each is below 0.005%; the balance is aluminum; the sum of the weight percentages of the above components is 100%.

2. The super-high heat-conducting aluminum alloy according to claim 1, characterized in that, The weight percentage of the aluminum component composition is greater than 94%.

3. A preparation method of the super-high heat-conducting aluminum alloy according to claim 1, characterized in that, Its preparation method is as follows: Preheat the crucible furnace to above 500°C; Put in pure aluminum ingots for melting. When the molten metal temperature reaches 720°C, carry out refining and slag removal. After completion, raise the temperature to 750°C, add the main element nickel, control the melting temperature at 750-810°C, fully stir and confirm that the nickel is completely melted, take samples for component analysis. After confirming that the nickel component is correct, add aluminum-titanium-carbon, stir and confirm that the aluminum-titanium-carbon is completely melted, then use a rotary degassing device for degassing. The degassing process takes 5-10 minutes. After completion, let it stand for 10 minutes, take samples for component determination. The final component determination must meet the specified conditions, and then cast aluminum ingots; The specified conditions are: calculated by weight percentage of the ultra-high heat conduction aluminum alloy, iron is below 0.1%; nickel is 2-5%; silicon is below 0.1%; titanium is 0.01-0.2%; aluminum is above 94%.

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