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Preparation method of hypereutectic aluminum-silicon alloy casting

An aluminum-silicon alloy and hypereutectic technology, which is applied in the metallurgical field, can solve the problems of reducing the mechanical properties of the hypereutectic aluminum-silicon alloy, limiting the use range of the hypereutectic aluminum-silicon alloy, and deteriorating the machining performance, and is easy to realize. Industrialization, small thermal expansion coefficient, small thermal cracking tendency

Inactive Publication Date: 2012-01-18
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Al-Si hypereutectic alloy, as the silicon content increases, the particles of primary silicon and eutectic silicon in the alloy structure also gradually increase, presenting coarse massive primary silicon and long needle-like eutectic silicon structures, which severely split the alloy. The matrix reduces the mechanical properties of the hypereutectic aluminum-silicon alloy, resulting in poor cutting performance, which limits the application range of the hypereutectic aluminum-silicon alloy with high silicon content

Method used

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  • Preparation method of hypereutectic aluminum-silicon alloy casting

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;

[0017] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, and then keep it at 820±5°C for 10 minutes. The amount of modifier added is 0.07% of the total weight of the alloy melt based on the P in the Cu10P alloy;

[0018] ZnCl in a bell jar 2 Press into the alloy melt, the addition amount is 0.20% of the total weight of the alloy melt, degassing at 820±5°C for 5 minutes, then remove the slag, and then cast at 770°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si20%, Cu2.0%, Ni1.1%, Mg1.6%, impurity 0.6%, and the balance is Al;

[0019] Heat the hypereutectic aluminum-silicon alloy b...

Embodiment 2

[0022] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;

[0023] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, and then keep it at 820±5°C for 12 minutes. The amount of modifier added is 0.071% of the total weight of the alloy melt based on the P in the Cu10P alloy;

[0024] ZnCl in a bell jar 2 Pressed into the alloy melt, the addition amount is 0.18% of the total weight of the alloy melt, degassing at 820±5°C for 6 minutes, then removing the slag, and then pouring at 780°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si22%, Cu1.0%, Ni1.6%, Mg1.0%, impurity 0.5%, and the balance is Al;

[0025] Heat the hypereutectic aluminum-silicon...

Embodiment 3

[0028] Preheat the crucible to 400±5°C, put Al28Si alloy, Al50Cu alloy and Al8Ni alloy in the crucible, raise the temperature to 720±5°C, press the metal magnesium into the molten material with a bell jar after all the materials are melted, and the metal The alloy melt is obtained after the magnesium is melted;

[0029] Use a bell jar to press the modifier Cu10P alloy into the alloy melt and stir evenly, then keep it warm at 820±5°C for 14 minutes, and the amount of modifier added is 0.074% of the total weight of the alloy melt based on the P in the Cu10P alloy;

[0030] ZnCl in a bell jar 2 Press into the alloy melt, the addition amount is 0.16% of the total weight of the alloy melt, degassing at 820±5°C for 7 minutes, then remove the slag, and then cast at 790°C to make a hypereutectic aluminum-silicon alloy billet. The composition by weight percentage is Si21%, Cu1.5%, Ni1.4%, Mg1.2%, impurity 0.5%, and the balance is Al;

[0031] Heat the hypereutectic aluminum-silicon a...

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Abstract

The invention discloses a preparation method of a hypereutectic aluminum-silicon alloy casting. The preparation method comprises the following steps of: (1) preheating a crucible, putting AlSi alloy, AlCu alloy and AlNi alloy into the crucible, heating the alloys, and pressing metallic magnesium into the molten materials; (2) pressing inoculant into the alloy melt, stirring the melt uniformly, and then preserving the heat; (3) pressing ZnCl2 into the alloy melt, removing slag after heat preservation and degassing, and casting the melt into a casting blank; and (4) performing heat treatment on the casting blank, and thus obtaining the hypereutectic aluminum-silicon alloy casting. The mechanical property of the product prepared by the method is superior to that of a similar hypereutectic aluminum alloy product; and the method is simple, easy to realize industrialization and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing a hypereutectic aluminum-silicon alloy casting. Background technique [0002] Hypereutectic aluminum-silicon alloy has low expansion performance, high wear resistance, high corrosion resistance and good thermal conductivity. It is widely used in automobile, aviation, aerospace and other fields as the material for making key parts such as engine pistons and rotors. In the Al-Si hypereutectic alloy, as the silicon content increases, the particles of primary silicon and eutectic silicon in the alloy structure also gradually increase, presenting coarse massive primary silicon and long needle-like eutectic silicon structures, which severely split the alloy. The matrix reduces the mechanical properties of the hypereutectic aluminum-silicon alloy, leading to poor cutting performance, and limits the application range of the hypereutectic aluminum-silicon alloy w...

Claims

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Application Information

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IPC IPC(8): B22D1/00C22C21/04C22C1/03C22F1/043
Inventor 陈志王铁军倪伟贾石张丙岩
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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