Heat-resistant high-pressure casting Al-Si-Ni-Cu aluminum alloy and preparation method thereof

An al-si-ni-cu, high-pressure casting technology

Active Publication Date: 2019-08-02
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a heat-resistant high-pressure cast Al-Si-Ni-Cu aluminum alloy and its preparation in order to solve the industrial problem that the application of the existing heat-resistant die-casting aluminum alloy is greatly limited due to the defect of insufficient heat resistance. method to solve the above problems

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  • Heat-resistant high-pressure casting Al-Si-Ni-Cu aluminum alloy and preparation method thereof

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Effect test

Embodiment 1

[0038] The weight percent of a heat-resistant high-pressure cast Al-Si-Ni-Cu aluminum alloy is: according to the theoretical ratio, 10.5% Si, 2.0% Ni, 3.0% Cu, 0.05% Mg, 0.1% Cr, 0.01% Sr, 0.1% %Zr, 0.1%Ti, 0.1%V, 0.1%Fe, and the balance is Al.

[0039] The preparation method is: S1. Remove the oxide layer of industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si master alloy AlSi23 respectively and dry and preheat to 200°C; calculate the required raw materials according to the composition and stoichiometric ratio of the alloy S2. After melting the industrial pure aluminum ingots accounting for 25% of the crucible height into a molten pool at 710°C, add the remaining industrial pure aluminum ingots; S3. After all the industrial pure aluminum ingots are melted, heat up to 720°C , add the Al-Si master alloy in 2 times, and keep the temperature constant at 720°C; S4. After the Al-Si master alloy is completely melted, raise the temperature to 780°C, and add AlNi...

Embodiment 2

[0042] The weight percent of a heat-resistant high-pressure cast Al-Si-Ni-Cu aluminum alloy is: according to the theoretical ratio, 12.0% Si, 3.0% Ni, 2.4% Cu, 0.2% Mg, 0.3% Cr, 0.04% Sr, 0.2% %Zr, 0.2%Ti, 0.5%Fe, and the balance is Al.

[0043]Its preparation method is: S1. Remove the oxide layer of industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si master alloy AlSi28 respectively and dry and preheat to 200°C; calculate the required raw materials according to the composition and stoichiometric ratio of the alloy The amount and preparation of materials; S2. After melting the industrial pure aluminum ingots accounting for 20% of the height of the crucible into a molten pool at 710°C, add the remaining aluminum ingots; S3. After all the industrial pure aluminum ingots are melted, heat up to 710°C, and Al-Si master alloy is added in 4 times, and the temperature is kept constant at 710°C; S4. After the Al-Si master alloy is completely melted, the temperatur...

Embodiment 3

[0046] The weight percent of a heat-resistant high-pressure cast Al-Si-Ni-Cu aluminum alloy is: according to the theoretical ratio, 11.0% Si, 4.0% Ni, 4.0% Cu, 0.2% Mg, 0.2% Cr, 0.03% Sr, 0.3% %Zr, 0.3%V, 0.4%Fe, and the balance is Al.

[0047] Its preparation method is: S1. Remove the oxide layer of industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si master alloy or industrial pure silicon respectively, dry and preheat to 200°C; calculate according to the composition and stoichiometric ratio of the alloy Amount of required raw materials, preparation of materials; S2. After melting the industrial pure aluminum ingots accounting for 22% of the height of the crucible into a molten pool at 715°C, add the remaining industrial pure aluminum ingots; S3. After all the industrial pure aluminum ingots are melted, heat up To 720°C, add Al-Si master alloy or industrial pure silicon in 3 times, and keep the temperature constant at 720°C; S4. After the Al-Si master al...

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Abstract

The invention provides a heat-resistant high-pressure casting Al-Si-Ni-Cu aluminum alloy and a preparation method thereof, the aluminum alloy comprises the following elements in percentage by weight:10.5-12.0% of Si, 2.0-5.0% of Ni, 2.0-4.0% of Cu, 0.05-0.2% of Mg, 0.1-0.5% of Cr, 0.01-0.04% of Sr, 0.3-0.6% of M, 0.1-0.5% of Fe and the balance of Al, wherein M is at least two elements of Ti, Zr,and V. The tensile strength of die-casting alloy at room temperature, 350 DEG C instantaneous and 350 thermal insulation is 318-360 MPa, 140-155 MPa and 75-93 MPa, and the elongation is 1.2-2.0%, 5.3-6.3% and 5.8-7.2%; without solution heat treatment, the die-casting alloy can be applied to automotive heat-resistant parts such as pistons so as to meet the needs of automotive lightweight development.

Description

technical field [0001] The invention relates to a heat-resistant high-pressure cast Al-Si-Ni-Cu aluminum alloy and a preparation method thereof, belonging to the field of industrial aluminum alloys and their manufacture. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength and specific stiffness, good corrosion resistance, excellent electrical and thermal conductivity, easy recycling, and good low-temperature performance. It is widely used in transportation, aerospace, electronics and other fields. Die casting is a casting method in which liquid metal is filled into the die-casting mold cavity at high speed under high pressure and solidified under pressure to form a casting. Die casting not only makes castings have high strength, dimensional accuracy and surface finish, but also is easy to realize mechanization and automation, high production efficiency, and can produce thin-walled castings with complex shapes. Wide ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/06C22C1/03B22D17/00
CPCB22D17/00C22C1/026C22C1/03C22C1/06C22C21/02
Inventor 叶兵蒋海燕丁文江
Owner SHANGHAI JIAO TONG UNIV
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