A kind of cast aluminum alloy with high thermal conductivity, high strength and low Si and preparation method thereof

Abstract

The invention discloses a cast aluminum alloy with high thermal conductivity, high strength and low Si and a preparation method thereof; the raw material components are: 2.5-4.5% Si; 2.0-3.0% Zn; 0.8-1.2% Fe; 0.2-0.4% Mg; 0.1-0.3% Co; 0.03-0.1% Sr; 0.02%-0.05% B; 0.05-0.15% RE; the balance is Al; the preparation method includes high-temperature melting aluminum alloy, supplementary elements and trace elements multi-component alloying treatment, Refining slag removal, casting molding. The invention makes full use of the composite synergistic effect of auxiliary alloying of Mg and Co elements and microalloying of Sr, B and RE elements, solves the problem of mutual restriction between the strengthening of the alloy and the improvement of the thermal conductivity of the material, and realizes the thermal conductivity and high thermal conductivity of the cast aluminum alloy. With the synchronous improvement of mechanical properties, a low-Si cast aluminum alloy material for communication and heat dissipation devices with high thermal conductivity and high strength has been obtained.

Description

technical field [0001] The invention relates to the technical field of cast aluminum alloys, in particular to a cast aluminum alloy with high thermal conductivity, high strength and low Si and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles, electronic products and information communication industries, the miniaturization, light weight and integration of equipment are getting higher and higher, and the performance requirements of materials are also getting higher and higher. Cast aluminum alloys are widely used in automotive parts, consumer electronics, communication devices (such as Die-casting production of base station radiators). At present, ADC12 alloy is the most widely used in aluminum alloy casting communication products. Its basic composition is Al-Si eutectic (Si content is 11-12%), but its thermal conductivity is only 96W / (m·K), which is far Less than half of pure aluminum. With the advent of the 5G ...

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Problems solved by technology

However, in order to ensure the high thermal conductivity of the material, the application has low content of Si and Fe. Low content of Si element will significantly reduce the flow filling performance of the alloy, and low content of Fe element will affect the release performance of die-casting products. Seriously affected the efficiency of industrial production; more importantly, the type and content of rare earth elements in the alloy disclosed in this application are more, and the cost is higher, which is not conducive to the promotion and use of industrial production

[0007] Based on the comprehensive requirements of the current communication field for the mechanical, thermal conductivity and casting fluidity of cast aluminum alloy products, there are currently many methods to improve the thermal conductivity of cast aluminum alloys, but there are still mutual constraints between the strengthening of the alloy and the improvement of the thermal conductivity of the material. The problems limit the industrial application range of these alloys in 5G communication structure heat dissipation devices

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