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A high-strength and high-thermal conductivity die-casting aluminum alloy material and its preparation method and application

A technology of aluminum alloy materials and cast aluminum alloys, which is applied in the field of non-ferrous metal materials and their preparation and forming, can solve the problems of inability to meet the requirements of the mechanical properties of structural parts, the decrease of thermal conductivity of die-casting parts, and the unfavorable demoulding of die-casting parts. Improve the strength and heat dissipation efficiency, save the cost of alloy manufacturing, excellent mechanical properties and thermal conductivity

Active Publication Date: 2019-08-06
SHENZHEN XINSHEN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three problems with this alloy: (1) In order to pursue high thermal conductivity, the Fe content in this alloy is only 0.2%~0.4%, and too low Fe content is not conducive to the demolding of die castings (especially complex thin-walled parts) , reduce production efficiency and increase mold loss; (2) The thermal conductivity disclosed in this patent is actually the performance of alloy ingots rather than die castings, but after the alloy is smelted and die cast into casting products, due to the high cooling rate of the die casting process, Si etc. The amount of solid solution of alloying elements in the aluminum matrix increases significantly, and the thermal conductivity of the actual die-casting will drop significantly, that is, the thermal conductivity of the die-casting produced by this alloy is significantly lower than 190 W / (m K)
(3) The mechanical properties of the alloy are extremely low, the yield strength is less than 100MPa, and the strength is only 180MPa, which cannot meet the mechanical properties of structural parts.

Method used

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  • A high-strength and high-thermal conductivity die-casting aluminum alloy material and its preparation method and application
  • A high-strength and high-thermal conductivity die-casting aluminum alloy material and its preparation method and application

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Experimental program
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Embodiment 1

[0035] The high-strength and high-thermal conductivity die-casting aluminum alloy material of this embodiment is prepared by the following method:

[0036] Prepare pure aluminum (Al≥99.7%), aluminum-silicon master alloy (Si 18.0-22.0%), pure magnesium (Mg≥99.9%) according to the above alloy composition, and the rest as flux, aluminum-strontium master alloy (Sr 9.0-11.0 %); drying the above-mentioned raw materials for subsequent use.

[0037] Melting: put pure aluminum into the smelting furnace, heat to 760°C to melt, then add aluminum-silicon intermediate alloy, stir evenly; then put in aluminum alloy refining agent to refine the melt, and then remove slag; after the temperature drops to 740°C , use a bell jar to press the dried magnesium ingot into the melt to melt it, control the temperature of the melt to stabilize at 740°C, then add the dried aluminum-strontium master alloy and stir well; after the alloy is completely melted, use The degassing equipment feeds high-purity ...

Embodiment 2

[0042] The ingots of Alloy 1, Alloy 3, Alloy 5 and ADC12 alloy in Example 1 were heated and remelted respectively, and high-purity argon was introduced into the melt using a rotary degassing device again for degassing and refining, and the degassing time was For 15 minutes, after the degassing is completed, the slag is removed.

[0043] (1) When the alloy melt is overheated at 100°C, it is poured into a spiral fluidity test mold preheated to 150°C, and then the length of the spiral sample is measured. Three spiral specimens were cast for each alloy, and the measured lengths were averaged. The fluidity of the alloy is characterized as a percentage relative to the flow length of the ADC12 alloy. The fluidity of alloy 1, alloy 3, and alloy 5 of this embodiment is 85.5%, 86.7%, and 88.2% of that of ADC12 alloy, respectively. Therefore, the fluidity of the alloy of the present invention is more than 85% of that of the ADC12 alloy, and has good casting fluidity, that is, the alloy...

Embodiment 3

[0048] The preparation and smelting steps of the high-strength medium heat conduction die-casting aluminum alloy in this implementation are the same as in Example 1. The chemical composition of the alloy obtained by direct reading spectrometer analysis is (mass fraction, %): Si 8.97, Mg3.18, Fe 0.075, Sr 0.02. Control the temperature of the smelted aluminum alloy liquid at 660~680°C, and use a 280-ton die-casting machine to produce a batch of mid-plate parts for a certain type of mobile phone. The average wall thickness of the plate in the complex thin-walled structural parts of mobile phones is 0.5 mm. The complex thin-wall structural parts mobile phone middle plate castings produced by using the high-strength medium heat-conducting die-casting aluminum alloy of the present invention are all well formed, and no insufficient pouring defect occurs. The average value of the mechanical properties measured by randomly selecting 5 pieces of communication chassis die-castings from d...

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Abstract

The invention relates to a high-strength, high-thermal-conductivity die-cast aluminum alloy material and a preparation method and applications for the same. The material mainly comprises, by mass, 8.0%-10.0% of Si, 1.5%-3.5% of Mg, 0.06%-0.5% of Fe and 0.005%-0.05% of Sr, as well as Al and other inevitable impurity elements. Through addition of a proper dosage of Mg in Al-Si alloy and control of contents of the impurity elements such as Fe, Cu, Mn, Cr, V and Ti, mechanical properties and thermal conductivity of the material are greatly improved in comparison with conventional die-cast aluminumalloy materials such as ADC12, YL102 and A380 on the premise that good die-casting shaping properties are ensured. The method is applicable to production of die-cast parts which have complicated shapes and request high strength and higher thermal conductivity, such as communication cases, radiators and mobile phone middle plates.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials and their preparation and molding, and relates to a die-casting aluminum alloy material with high strength and high thermal conductivity, a preparation method and application thereof. Background technique [0002] With the rapid development of electronic information, communication, automobile and other industries, consumer electronics products, LED lighting equipment, communication base stations, auto parts, etc. have a tendency to develop in the direction of miniaturization and high integration, so the structure and mechanical properties of materials And heat dissipation requirements are getting higher and higher. Aluminum-silicon alloy is a good choice for high-performance structural materials and heat dissipation materials due to its excellent formability and machinability, low cost, and environmental friendliness. [0003] Die-casting aluminum alloys are widely used in the fields of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/02
CPCC22C1/026C22C1/03C22C1/06C22C21/02
Inventor 张逸智长海博文
Owner SHENZHEN XINSHEN NEW MATERIAL TECH CO LTD