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Compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy

A technology of casting aluminum alloy and composite treatment, which is applied in the field of composite treatment to simultaneously improve the thermal conductivity and mechanical properties of die-casting aluminum alloy, which can solve the mutual constraints between thermal conductivity and mechanical and casting performance of die-casting aluminum alloy, low element content, and insufficient fluidity and mold release requirements, etc., to achieve the effect of improving thermal conductivity and mechanical properties, good comprehensive effect, and easy to control the amount of addition

Active Publication Date: 2019-03-26
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of Si (0.5-2.0%wt) and Fe (0.2-0.6%wt) in the aluminum alloy prepared by this method is relatively low, which cannot meet the fluidity and mold release requirements of actual die-casting production.
Although many methods have been proposed to improve the thermal conductivity of Al-Si cast aluminum alloys, they have not been able to solve the problem of mutual constraints between the thermal conductivity and mechanical and casting properties of die-casting aluminum alloys.

Method used

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  • Compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy
  • Compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy
  • Compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: Composite treatment of ADC12 alloy

[0054] The alloy processed in this embodiment is a commercial ADC12 cast aluminum alloy, which is compounded by adding Al-B, Al-Sr and Al-RE master alloys, wherein RE is a mixed rare earth containing Ce and La (the mass ratio of Ce / La is 6 / 4). The composition by weight percentage is: Si: 9.6-12%, Fe<1.3%, Cu: 1.5-3.5%, Mg<0.3%, Mn<0.5%, Zn<1.0%, Ni<0.5%, Sn<0.3%, B: 0.1%, Sr: 0.03%, RE: 0.3%, and the balance is Al.

[0055] The specific steps and process parameters of composite treatment are as follows:

[0056] (1) Melting aluminum alloy. The ADC12 alloy was weighed and then melted to obtain an aluminum alloy melt with a melting temperature of 720°C.

[0057] (2) Melt impurity sedimentation and melt purification. Add Al-B master alloy to ADC12 melt for B treatment, and the addition of B element is controlled at 0.1% of the melt weight. The treatment temperature is 730°C, stirring for 2 minutes until the alloy co...

Embodiment 2

[0064] Embodiment 2: Composite treatment of A356 alloy

[0065] The alloy treated in this example is a commercial A356 alloy, which is compounded by adding Al-B, Al-Sr and Al-RE master alloys, wherein RE is the rare earth La. The composition by weight percentage is: Si: 6.5-7.5%, Fe<0.12%, Cu<0.1%, Mg: 0.3-0.45%, Mn<0.05%, Zn<0.05%, Ti<0.2%, B: 0.05%, Sr: 0.1%, RE: 0.15%, and the balance is Al. The specific smelting process of this embodiment is similar to that of Embodiment 1. The difference is that the addition amount and process parameters are different.

[0066] Concrete steps and process parameters thereof are as follows:

[0067] (1) Melting aluminum alloy. The A356 alloy was weighed and then melted to obtain an aluminum alloy melt with a melting temperature of 750°C.

[0068] (2) Melt impurity sedimentation and melt purification. Add Al-B master alloy to the A356 melt for B treatment, and the addition of B element is controlled at 0.05% of the melt weight. The tr...

Embodiment 3

[0074] Embodiment 3: Composite treatment of A380 alloy

[0075] The alloy processed in this embodiment is a commercial A380 alloy, which is compounded by adding Al-B, Al-Sr and Al-RE master alloys, wherein RE is a mixed rare earth containing Ce and La (the mass ratio of Ce / La is 6 / 4 ). The composition by weight percentage is: Si: 7.5-9.5%, Fe<2.0%, Cu: 3.0-4.0%, Mg<0.1%, Mn<0.5%, Zn<3.0%, Ni<0.5%, Sn<0.35%, B: 0.05%, Sr: 0.2%, RE: 0.1%, and the balance is Al.

[0076] The specific smelting process of this embodiment is similar to that of Embodiment 1. The difference is that the addition amount and process parameters are different.

[0077] Concrete steps and process parameters thereof are as follows:

[0078] (1) Melting aluminum alloy. The A380 alloy was weighed and then melted to obtain an aluminum alloy melt with a melting temperature of 720°C.

[0079] (2) Melt impurity sedimentation and melt purification. Add Al-B master alloy to the A356 melt for B treatment, and ...

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Abstract

The invention discloses a compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy. The method comprises the steps of preparing and melting aluminum alloy first, adding Al-B intermediate alloy for B treatment, controlling the processing temperature between 700 and 730 DEG C, mixing until alloy components are uniform, standing and insulating, and controlling the weight percent of the B element to be 0.03 to 0.15% of the total weight of the alloy; adding Al-Sr and Al-Re intermediate alloy to melt for compound modification treatment, controlling the processing temperature between 680 and 720 DEG C, mixing until the alloy components are uniform, standing and insulating, and controlling the weight percent of the Sr element to be 0.03 to 0.2% of the total weight of the alloy; and performing refining and deslagging treatment, and discharging for cast forming after slagging off so as to obtain the compound aluminum alloy melt. The compound processing method has the advantages of simple and convenient process, easiness in implementation, easiness in control over the addition and obvious effect, and the heat-conducting and mechanical properties of the die casting aluminum alloy can be simultaneously improved and increased.

Description

technical field [0001] The invention relates to a compound treatment method for modifying cast aluminum alloy, in particular to a compound treatment method for simultaneously improving heat conduction and mechanical properties of die-cast aluminum alloy. Background technique [0002] With the rapid development of new energy vehicles, electronic products, and information communication industries, auto parts, electronic products, and communication devices (such as base station radiators) have higher and higher requirements for miniaturization, light weight, and integration. Especially with the coming of the 5G communication era, the operating power and heat generation of communication equipment are getting higher and higher, and the heat dissipation per unit volume of equipment is increasing. Therefore, the development and application of high thermal conductivity materials suitable for the communication industry has become the key to improving the heat dissipation capacity of ...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 杜军温澄吴东方甘俊旗
Owner SOUTH CHINA UNIV OF TECH
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