High-thermal-conductivity die-casting aluminum-zinc alloy material and preparation method thereof
A zinc alloy and high thermal conductivity technology, which is applied in the field of non-ferrous metal materials and their preparation and forming, can solve the problems of decreased thermal conductivity of die castings, unfavorable demoulding of die castings, and reduced production efficiency, so as to improve thermal conductivity and good comprehensive mechanical properties , Improve the effect of cooling efficiency
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Embodiment 1
[0044] The high thermal conductivity die-cast aluminum-zinc alloy of this embodiment is prepared by the following method:
[0045] A die-cast aluminum-zinc alloy material with high thermal conductivity, comprising the following components in mass percent: Zn 2.0-5.0%, Fe 0.5-1.3%, Mg 0.1-0.6%, and the balance is Al and impurities. Among them, impurities (by mass percentage) include: Si≤0.40%, Cu≤0.10%, Mn≤0.03%, Cr≤0.03%, V≤0.03%, Ti≤0.03%, Zr≤0.03%, and other impurities; The individual elements of the other impurities are ≤0.05%, and the total is ≤0.10%.
[0046] Ingredients: prepare pure zinc (Zn≥99.9%), pure magnesium (Mg≥99.9%), pure aluminum (Al≥99.7%) and iron additives (Fe~75%) according to the above alloy components (the iron contains Fe The iron content is 75%, and the rest is co-solvent. Therefore, when burning loss is not considered, the iron should be prepared according to 1.33 (1 / 75%=1.33) times of the required Fe content); the above-mentioned raw materials are d...
Embodiment 2
[0053] Will Example 1 The ingots of alloy 4, alloy 5 and ADC12 alloy were heated and remelted into molten aluminum respectively, and high-purity argon gas was introduced into the melt by rotary degassing equipment again for degassing and refining. The degassing time was 15 minutes. After degassing, carry out slag removal.
[0054] When the molten aluminum cools down to overheating 50°C, use a 300-ton die-casting machine to die-cast a batch of flat test pieces and standard tensile samples with a thickness of 3 mm. Randomly select 5 flat test pieces for each alloy to test their thermal conductivity and 5 tensile test pieces. The mechanical properties of the samples were tested, and the comparison of the average thermal conductivity and mechanical properties data is shown in Table 2. It can be seen from the table that the aluminum alloy of the present invention still maintains excellent thermal conductivity and good mechanical properties after die casting.
[0055] Table 2 Comp...
Embodiment 3
[0058] The ingredients and smelting steps of the high thermal conductivity die-casting aluminum alloy prepared in this implementation are the same as in Example 1, and the chemical composition of the alloy obtained by direct-reading spectrometer analysis is (mass fraction, %): Zn 3.11, Fe 0.92, Mg 0.38, Al balance . Control the temperature of the alloy melt at 680-700°C, and use a 300-ton die-casting machine to produce a batch of communication equipment cooling shells. The key dimensions of the heat dissipation housing die-casting are as follows: the average wall thickness is 2.5mm, the height of the heat sink is 45mm, and the top thickness of the heat sink has three specifications, which are 0.8mm, 1.2mm and 2.0mm. The heat dissipation housing produced by using the high heat conduction die-casting aluminum alloy of the present invention is well formed, and the top of the heat dissipation fin does not have insufficient pouring defects. The average value of the thermal conduct...
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