High-thermal-conductivity die-casting aluminum alloy and preparing method thereof

Abstract

The invention provides a high-thermal-conductivity die-casting aluminum alloy. The high-thermal-conductivity die-casting aluminum alloy comprises, by mass percentage, 0.05%-1.0% of silicon, 0.3%-1. 3% of iron, 0.2%-2.0% of nickel, 0.1%-1.2% of magnesium, 0.001%-0.15% of strontium and the balance aluminum and inevitable impurities, wherein the mass percentage of the impurities is smaller than 0.2%. The invention further provides a preparing method of the high-thermal-conductivity die-casting aluminum alloy. The preparing method comprises the steps that at different heating temperatures, the aluminum and magnesium, an aluminum silicon intermediate alloy, a ferro-aluminium intermediate alloy, a nickel-aluminum intermediate alloy and an aluminum strontium intermediate alloy are sequentially fused to obtain aluminum, silicon, iron, nickel, magnesium and strontium fusion; then refined treatment and slag removal treatment are carried out to obtain an aluminum alloy solution; and the temperature of the aluminum alloy solution is adjusted to be 680 DEG C to 720 DEG C, and then casting can be carried out. The high-thermal-conductivity die-casting aluminum alloy has the excellent casting performance and has the higher heat conductivity coefficient.

Description

technical field [0001] The invention relates to a high thermal conductivity die-casting aluminum alloy, which belongs to the technical field of metal materials. Background technique [0002] With the development of modern industry, the heat dissipation of electronics, communications, aerospace and automobile industries is increasing, and the requirements for the thermal conductivity of materials are getting higher and higher. The performance of traditional metal materials can no longer meet the needs of practical applications. Research and development are applicable Aluminum alloy materials with high thermal conductivity for die casting have important application value. Aluminum-silicon alloys and aluminum-magnesium alloys have excellent casting properties. However, the thermal conductivity is generally not high. At present, the mainstream die-casting aluminum alloys such as ADC12 can achieve a thermal conductivity of about (96-110) W / (m.K) in the as-cast state. The therma...

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Problems solved by technology

Even if the structure is refined by the modifier, the thermal conductivity of the material in the as-cast state is still low, and most complex large-scale die castings cannot be further improved by heat treatment

NIKKEI MC ALUMINUM company has developed Al-2Ni-Fe die-casting aluminum alloy, the thermal conductivity of the as-cast state reaches 190W / (m.K), but the casting performance is lower than ADC12 by more than 35%, and its hardness is low and the strength is low

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