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Cast aluminum alloy and preparation method thereof

A technology for casting aluminum alloys and aluminum alloys, which is applied in the field of aluminum alloy casting, can solve the problems of non-dense structure and existence of cast aluminum alloy ingots, and achieve the effects of dense fracture structure, less surface pores and inclusions, and more quality defects.

Inactive Publication Date: 2021-04-02
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems that the internal structure of the cast aluminum alloy ingot produced by the existing method is not dense, there are pores and slag inclusions, and provides a cast aluminum alloy and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0013] Specific Embodiment 1: In this embodiment, a cast aluminum alloy is composed of 8-9.5% Si, Fe≤0.4%, 2-3% Cu, Mn≤0.3%, 0.15-0.35% Mg, Cr≤0.2%, Ni≤0.2%, Zn≤0.3%, Pb≤0.05%, Ti≤0.2%, Sn≤0.01%, and the balance is composed of Al; the content ratio of Mn and Fe in the cast aluminum alloy is ≥0.65.

[0014] The role of each element in this embodiment:

[0015] 1. The role of Si: Silicon can improve the casting performance of the alloy. Since the solidification latent heat of silicon is higher than that of aluminum, silicon will increase the fluidity of aluminum alloy. Silicon grains have high hardness and good chemical stability, which makes aluminum alloy have higher wear resistance and corrosion resistance.

[0016] 2. The role of Cu: Adding copper to aluminum alloy can enhance the corrosion resistance and mechanical strength of aluminum alloy. After copper is added to the aluminum-silicon alloy, the hardness and high-temperature mechanical properties of the aluminum alloy ...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the cast aluminum alloy consists of 8.9% Si, Fe≤0.38%, 2.35% Cu, Mn≤0.28%, 0.3% Mg, Cr≤ 0.18%, Ni≤0.18%, Zn≤0.28%, Pb≤0.05%, Ti≤0.18%, Sn≤0.01%, and the balance is composed of Al. Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: In this embodiment, a method for preparing a cast aluminum alloy is carried out according to the following steps:

[0022] 1. The formula of the aluminum alloy based on the material preparation is: by mass percentage, 8-9.5% Si, Fe≤0.4%, 2-3% Cu, Mn≤0.3%, 0.15-0.35% Mg, Cr≤0.2%, Ni ≤0.2%, Zn≤0.3%, Pb≤0.05%, Ti≤0.2%, Sn≤0.01%, and the balance is composed of Al; according to the formula of aluminum alloy, weigh aluminum ingot, metal copper and metal silicon , Mn-containing scrap and Mg-containing scrap are used as smelting raw materials;

[0023] 2. Put the aluminum ingot into the natural gas furnace and start to heat up. After the furnace material is completely melted and collapsed to form a liquid surface of the molten material, add metal copper into the furnace, sprinkle the covering agent, and grill it when the temperature of the melt is 700-720°C Sprinkle the slag into the slag cleaning agent, raise the temperature to 870-920°C at a rate o...

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PUM

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Abstract

The invention discloses a cast aluminum alloy and a preparation method thereof, and relates to the field of aluminum alloy casting, in particular to a cast aluminum alloy and a preparation method thereof. The cast aluminum alloy and the preparation method aim at solving the problems that cast aluminum alloy ingots manufactured through an existing method are not compact in internal structure and have air holes and slag inclusion. The aluminum alloy is composed of, in percentage by mass, 8%-9.5% of Si, not larger than 0.4% of Fe, 2%-3% of Cu, not larger than 0.3% of Mn, 0.15%-0.35% of Mg, not larger than 0.2% of Cr, not larger than 0.2% of Ni, not larger than 0.3% of Zn, not larger than 0.05% of Pb, not larger than 0.2% of Ti, not larger than 0.01% of Sn and the balance Al; and the content ratio of Mn to Fe in the cast aluminum alloy is larger than or equal to 0.65. The method comprises the following steps of weighing smelting raw materials; smelting the smelting raw materials accordingto the process sequence and the process temperature; preparing a casting melt according to a process; and casting the alloy melt through a filtering device to obtain the cast aluminum alloy. The method is used for casting the cast aluminum alloy.

Description

technical field [0001] The invention relates to the field of aluminum alloy casting, in particular to a casting aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si-Cu-Mg-Mn multi-element alloy has the advantages of high strength, easy forming, good casting performance, high air tightness, good machinability and weldability, and is widely used in the automobile industry. The cast aluminum alloy is produced using recycled aluminum and low-grade scrap aluminum as raw materials, which puts forward higher requirements on the melting process and melt quality. The high-silicon alloy of this alloy ensures that the silicon is fully alloyed to ensure a compact structure, and no pores and slag inclusions become the key to internal quality control. Contents of the invention [0003] The present invention aims to solve the problems that the internal structure of the cast aluminum alloy ingot produced by the existing method is not dense, there are pores...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22B9/02C22B9/05C22C1/02
CPCC22B9/02C22B9/05C22C1/026C22C21/02
Inventor 刘杰张雷蕫保孙海波孔祥生杜鹏赵成才林慧鑫
Owner NORTHEAST LIGHT ALLOY CO LTD
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