A heat-resistant recycled die-casting aluminum alloy and its preparation method

A casting aluminum alloy and heat-resistant technology, which is applied in the field of heat-resistant recycled die-casting aluminum alloy and its preparation, can solve the problems of high cost, low thermal expansion coefficient, and poor heat resistance of heat-resistant cast aluminum alloy, and reduce the cost of the alloy , high resource utilization and low cost

Active Publication Date: 2021-11-30
肇庆南都再生铝业有限公司 +2
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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 is not good, so it is necessary to introduce a high thermal stability phase, such as Al 3 Ni, Al7Cu4Ni, AlFeSi, Al 3 Sc, Al 3 (Zr, Ti, V), Al 4 RE, (Ti,Cr,Mn,V)B 2 etc. Adding Cu and Ni elements in the preparation process is the most common, forming Al-Si-Cu-Mg-Ni heat-resistant cast aluminum alloys, such as ZL108, ZL109, A319 and other brands, and the instantaneous strength at 350 ° C can reach more than 120 MPa, but using The heat-resistant cast aluminum alloy prepared by this method has high cost and low high temperature strength

Method used

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  • A heat-resistant recycled die-casting aluminum alloy and its preparation method
  • A heat-resistant recycled die-casting aluminum alloy and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Design ingredients: Al-12% Si-1.2% Fe-1.0% Mg-0.6% Ni-0.3% Mn-0.1% Cr-0.01% B; i.e. of Si, 1.2% of Fe 12%, and 1.0% Mg , 0.6% Ni, 0.3% of Mn, 0.1% of Cr, 0.01% of B and the balance consisting of Al;

[0028] (1) After the separation, cleaned, preheated scrap material added aluminum melting furnace, melting temperature of 750 ℃, remelted at a melt sampled intermediate position, the test chemical composition of the melt;

[0029] (2) difference from the control elements in the design of the main component and the component Found alloys including Si, Ni, Fe, Cr and other high melting point additives, heated to 760 deg.] C, to adjust the content and the melt temperature of the alloying elements through feed supplement;

[0030] (3) melt temperature adjusted to 720 ℃, the ingot was added Mg, Al-B intermediate alloy, low-melting alloy;

[0031] (4) by a melt-line refining, insulation, cast into the slag ingots, remelting after casting unit for preparation of high heat resistant a...

Embodiment 2

[0035] Design ingredients: Al-12% Si-1.4% Fe-0.95% Mg-0.5% Ni-0.2% Mn-0.12% Cr-0.03% B; i.e. from 12% of Si, 1.4% of Fe, 0.95% of Mg , 0.5% Ni, 0.2% of Mn, 0.12% of Cr, 0.03% of B and the balance consisting of Al;

[0036] (1) After the separation, cleaned, preheated scrap material added aluminum melting furnace, the melting temperature is 760 deg.] C, in the melt after intermediate position remelted sample, the test chemical composition of the melt;

[0037] (2) difference from the control elements in the design of the main component and the component Found alloys including Si, Ni, Fe, Cr and other high melting point additives, heated to 780 deg.] C, to adjust the content and the melt temperature of the alloying elements through feed supplement;

[0038] (3) melt temperature adjusted to 740 ℃, the ingot was added Mg, Al-B intermediate alloy, low-melting alloy;

[0039] (4) by a melt-line refining, insulation, cast into ingots after the slag / poured into the holding furnace, for ...

Embodiment 3

[0043] The design composition is 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, 10% Si, 0.9% Fe, 1.35% Mg, 0.7% Ni, 0.25% Mn, 0.08% Cr, 0.02% B and margin were made of Al.

[0045] (1) After selection, cleaning, preheated waste aluminum material is added to the smelting furnace, the melting temperature is 750 ° C, and the chemical component of the melt is taken after the molten temperature of 750 ° C.

[0046] (2) The difference in the content of the main alloy element in the design component and the measured component, including Si, Ni, Fe, Cr, etc., the temperature of the above-mentioned alloy element and the melt temperature of the above-mentioned alloy element are adjusted by supplementing the feedstock.

[0047] (3) Adjust the melt temperature to 720 ° C, add a low melting point alloy such as Mg ingot, AL-B intermediate alloy;

[0048] (4) The melt is refined, heats up, and the slag is poured into a ingot. After the remembering, th...

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Abstract

The invention discloses a heat-resistant recycled die-casting aluminum alloy and a preparation method thereof, belonging to the field of preparation of recycled die-casted aluminum alloys. The invention includes a method for providing a heat-resistant recycled die-casting aluminum alloy and a preparation method for reducing the preparation cost; the chemical composition of the heat-resistant recycled die-casted aluminum alloy is as follows: the content of Si is 10.0-12.0%, and the content of Ni is 0.50-0.75%. , the content of Mg is 0.95-1.35%, the content of Fe is 0.9-1.4%, the content of Mn is 0.20-0.30%, the content of Cr is 0.08-0.12%, the content of B is 0.015-0.03%, and the content of impurity elements is ≤ 0.15%, and the rest is Al; the preparation method is as follows: smelting, sampling to adjust the alloy composition, refining after adding low-melting point alloy, slag removal, and casting; the present invention effectively reduces the alloy content by replacing Ni and Cu with cheap impurity element Fe. Cost, and through the compound modification technology of Mn, Cr, B, etc., the size of the iron-rich phase is refined to ensure the high temperature strength of the alloy.

Description

Technical field [0001] The present invention relates to the field of preparing an aluminum alloy casting reproduction, and particularly relates to an aluminum alloy casting method of preparing a heat regeneration. Background technique [0002] Al-Si based aluminum alloy casting having excellent casting properties, low thermal expansion coefficient, good air tightness and wear resistance, is widely used in automotive, electronics, telecommunications and other fields. As the vehicle fuel efficiency and increasing demands of energy saving, to lightweight, high strength aluminum material represented been more widely used, and its applications from the traditional appearance of the member, the non-bearing member to gradually expand structure, a support member, to bear long enough thermal fatigue loads and high temperature conditions role of 350-400 deg.] C, more demanding work environment. [0003] Heat-resistant cast aluminum alloy mainly composed of Al-Si and Al-Cu two series, Al-Cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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