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High-thermal-conductivity aluminum alloy material for semi-solid rheo-die casting and preparation method of high-thermal-conductivity aluminum alloy material

An aluminum alloy material and semi-solid rheological technology, which is applied in the field of alloy materials, can solve the problems of unsatisfactory comprehensive performance of aluminum alloys, achieve good casting fluidity, good die-casting effect, and reduce hydrogen content and slag content.

Active Publication Date: 2021-10-01
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004]Through the analysis of the above documents, it can be found that the existing technology is mainly based on cast aluminum alloy or deformed aluminum alloy, by adding a large amount of alloying elements to improve the aluminum alloy casting fluidity, thermal conductivity or mechanical properties, but the overall performance of existing aluminum alloys is still not ideal

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  • High-thermal-conductivity aluminum alloy material for semi-solid rheo-die casting and preparation method of high-thermal-conductivity aluminum alloy material

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preparation example Construction

[0032] The invention provides a method for preparing a high thermal conductivity aluminum alloy material for semi-solid rheological die-casting, comprising the following steps:

[0033] 1) Preheating aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Sr alloy, Al-10Ce alloy and Al-10Y alloy;

[0034] 2) Heating and melting: melting the preheated aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Ce alloy and Al-10Y alloy to obtain a melt;

[0035] 3) Refining and modification: adding Al-10Sr alloy to the melt for modification treatment, and then passing argon gas into the melt for refining and degassing;

[0036] 4) Casting and solution heat treatment: the melt in step 3) is cast into shape, and then the casting is sequentially subjected to solution heat treatment and cooled with the furnace to obtain a high thermal conductivity aluminum alloy material.

[0037] In the present invention, in step 1), the raw material is preheated to 150-200°C, preferably ...

Embodiment 1

[0047] A high thermal conductivity aluminum alloy material for semi-solid rheological die-casting, the aluminum alloy material includes the following components by weight percentage: Si: 7.5%, Fe: 0.3%, Ti: 0.1%, B: 0.02%, Sr : 0.02%, rare earth elements: 0.5%, Mg<0.1%, total content of impurity elements ≤0.15%, and the rest is Al.

[0048] Its preparation method is as follows:

[0049] Aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Sr alloy, Al-10Ce alloy and Al-10Y with a mass ratio of 60:37.5:3:2:0.2:3:2 The alloy is preheated to 150°C;

[0050] Add the preheated aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Ce alloy and Al-10Y alloy into the melting furnace and melt them all to obtain a melt with a melting temperature of 750°C;

[0051] When the melt temperature drops to 720°C, add Al-10Sr alloy for modification treatment, and stir evenly; then pass argon gas into the melt for refining and degassing in the furnace. slag;

[0052] When the...

Embodiment 2

[0055] A high thermal conductivity aluminum alloy material for semi-solid rheological die-casting, the aluminum alloy material includes the following components by weight percentage: Si: 8.0%, Fe: 0.35%, Ti: 0.07%, B: 0.014%, Sr : 0.04%, rare earth elements: 0.3%, Mg<0.1%, total content of impurity elements ≤0.15%, and the rest is Al.

[0056] Its preparation method is as follows:

[0057] Aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Sr alloy, Al-10Ce alloy and Al-10Y with a mass ratio of 60.5:40:3.5:1.4:0.4:1.8:1.2 The alloy is preheated to 180°C;

[0058] Add the preheated aluminum, Al-20Si alloy, Al-10Fe alloy, Al-5Ti-1B alloy, Al-10Ce alloy and Al-10Y alloy into the furnace and melt them all to obtain a melt with a melting temperature of 755°C;

[0059] When the melt temperature drops to 725°C, add Al-10Sr alloy for modification treatment, and stir evenly; then pass argon gas into the melt for refining and degassing in the furnace. slag;

[0060] When ...

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Abstract

The invention provides a high-thermal-conductivity aluminum alloy material for semi-solid rheo-die casting, and belongs to the technical field of alloy materials. The aluminum alloy material comprises the following components in percentage by weight: 7 to 10 percent of Si, 0.3 to 0.8 percent of Fe, less than 0.05 to 0.2 percent of Ti, 0.01 to 0.04 percent of B, 0.02 to 0.06 percent of Sr, 0.1 to 0.6 percent of rare earth element, less than 0.1 percent of Mg and the balance of Al and impurity elements. The aluminum alloy material is excellent in casting fluidity, moderate in rheo-die casting forming temperature range and excellent in heat conduction and electric conduction characteristics, the heat conductivity coefficient of the aluminum alloy material can reach 190 W / (m.K) or above, and the aluminum alloy material is suitable for being applied to semi-solid rheo-die casting production of high-quality high-heat-conductivity aluminum alloy castings, especially thin-wall complex heat dissipation shell parts of electronic products.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a high thermal conductivity aluminum alloy material for semi-solid rheological die-casting and a preparation method thereof. Background technique [0002] Die-casting aluminum alloy has the advantages of low density, high specific strength, and good thermal conductivity, and is widely used in the production of structural parts in electronic products such as CPU radiators, camera casings, mobile phone mid-boards, and notebook panels. With the progress and rapid development of modern technology, especially in the automotive, electronics and communication appliances industries, some electronic products, LED lighting equipment, heat dissipation housings for 5G communication base stations, etc. tend to be miniaturized and lightweight, and with the With the increase of power, the demand for heat dissipation performance is also further increased. [0003] In recent years, there...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043B22D17/00
CPCC22C21/04C22C1/026C22C1/03C22C1/06C22F1/043B22D17/007
Inventor 龙文元陈勤
Owner NANCHANG HANGKONG UNIVERSITY
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