Heat-resistant regeneration die-cast aluminum alloy and preparation method thereof

A cast aluminum alloy, heat-resistant technology, applied in the field of heat-resistant recycled die-cast aluminum alloy and its preparation, can solve the problems of low thermal expansion coefficient, poor corrosion resistance, low high temperature strength, etc., achieve high room temperature mechanical properties, reduce alloy The effect of high cost and resource utilization

Active Publication Date: 2020-11-13
肇庆南都再生铝业有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Heat-resistant cast aluminum alloys are mainly composed of two series, Al-Si and Al-Cu. Among them, Al-Cu series alloys have good heat resistance, but poor fluidity and corrosion resistance, which hinder the application of alloys; and Al-Si The series of alloys have good casting performance, strong oxidation resistance, good thermal conductivity and low thermal expansion coefficient, and have good application prospects; because the main strengthening phase Mg in Al-Si alloy 2 Si, Al 2 Cu coarsens at 250°C, and the heat resistance

Method used

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  • Heat-resistant regeneration die-cast aluminum alloy and preparation method thereof
  • Heat-resistant regeneration die-cast aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example 1:

[0027] The design composition is: Al-12%Si-1.2%Fe-1.0%Mg-0.6%Ni-0.3%Mn-0.1%Cr-0.01%B; that is, 12% Si, 1.2% Fe, 1.0% Mg , 0.6% Ni, 0.3% Mn, 0.1% Cr, 0.01% B and the balance being Al;

[0028] (1) Put the sorted, cleaned, and preheated scrap aluminum into the melting furnace, and the melting temperature is 750°C. After remelting, take a sample in the middle of the melt to test the chemical composition of the melt;

[0029] (2) Comparing the difference in the content of main alloying elements in the design composition and the measured composition, including Si, Ni, Fe, Cr and other high melting point additives, the temperature is raised to 760°C, and the content of the above alloying elements and the melt temperature are adjusted by supplementing raw materials;

[0030] (3) After adjusting the melt temperature to 720°C, add low-melting point alloys such as Mg ingots and Al-B master alloys;

[0031] (4) The melt is cast into ingots after online refining, hea...

Example Embodiment

[0034] Example 2:

[0035] The design composition is: Al-12%Si-1.4%Fe-0.95%Mg-0.5%Ni-0.2%Mn-0.12%Cr-0.03%B; that is, 12% Si, 1.4% Fe, 0.95% Mg , 0.5% Ni, 0.2% Mn, 0.12% Cr, 0.03% B and the balance being Al;

[0036] (1) Put the sorted, cleaned and preheated waste aluminum into the melting furnace, the melting temperature is 760°C, after remelting, take a sample in the middle of the melt, and test the chemical composition of the melt;

[0037] (2) Comparing the difference in the content of main alloying elements in the design composition and the measured composition, including Si, Ni, Fe, Cr and other high melting point additives, the temperature is raised to 780°C, and the content of the above alloying elements and the melt temperature are adjusted by supplementing raw materials;

[0038] (3) After adjusting the melt temperature to 740°C, add low melting point alloys such as Mg ingots and Al-B master alloys;

[0039] (4) After on-line refining, heat preservation, and slag re...

Example Embodiment

[0042] Example 3:

[0043] The design components are as follows:

[0044] Al-10%Si-0.9%Fe-1.35%Mg-0.7%Ni-0.25%Mn-0.08%Cr-0.02%B; that is, from 10% Si, 0.9% Fe, 1.35% Mg, 0.7% Ni, 0.25% of Mn, 0.08% of Cr, 0.02% of B and the rest are composed of Al.

[0045] (1) Put the sorted, cleaned, and preheated scrap aluminum into the melting furnace, and the melting temperature is 750°C. After remelting, take a sample in the middle of the melt to test the chemical composition of the melt;

[0046] (2) Comparing the difference in the content of main alloying elements in the design composition and the measured composition, including Si, Ni, Fe, Cr and other high melting point additives, the temperature is raised to 750°C, and the content of the above alloying elements and the melt temperature are adjusted by supplementing raw materials;

[0047] (3) After adjusting the melt temperature to 720°C, add low-melting point alloys such as Mg ingots and Al-B master alloys;

[0048] (4) The melt...

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Abstract

The invention discloses a heat-resistant regeneration die-cast aluminum alloy and a preparation method thereof, and belongs to the field of regeneration die-cast aluminum alloy preparation. The invention provides the heat-resistant regeneration die-cast aluminum alloy capable of reducing the preparation cost and the preparation method of the heat-resistant regeneration die-cast aluminum alloy. Chemical components of the heat-resistant regeneration die-cast aluminum alloy include 10.0%-12.0% of Si, 0.50%-0.75% of Ni, 0.95%-1.35% of Mg, 0.9%-1.4% of Fe, 0.20%-0.30% of Mn, 0.08%-0.12% of Cr, 0.015%-0.03% of B, smaller than or equal to 0.15% of an impurity element and the balance Al. The preparation method includes the steps that smelting is conducted; sampling is conducted to adjust the alloycomponents; refining is conducted after low-melting-point alloy addition; slag removal is conducted; and casting is conducted. According to the heat-resistant regeneration die-cast aluminum alloy andthe preparation method, Ni and Cu are replaced with the low-cost impurity element Fe, and the alloy cost is effectively reduced; and by means of the compound modification technology of the Mn, the Cr, the B and the like, the size of the iron-rich phase is refined, and the high-temperature strength of the alloy is ensured.

Description

technical field [0001] The invention relates to the field of preparation of recycled die-casting aluminum alloys, in particular to a heat-resistant recycled die-casting aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si cast aluminum alloys have excellent casting performance, low thermal expansion coefficient, good air tightness and wear resistance, and are widely used in automobiles, electronics, communications and other fields. With the continuous improvement of automobile fuel efficiency and energy saving and environmental protection requirements, lightweight and high-strength materials represented by aluminum have been more and more widely used, and its application fields have gradually expanded from traditional appearance parts and non-bearing parts to structural parts, The supporting parts have to withstand sufficient load and thermal fatigue at a high temperature of 350-400 °C for a long time, and the working environment is relatively...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/04C22F1/043
Inventor 赵愈亮林朋宋东福贾义旺叶猛刘秋霞赖沛基
Owner 肇庆南都再生铝业有限公司
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