Aluminum-silicon alloy material and preparation method thereof

An aluminum-silicon alloy and alloy technology, applied in the field of aluminum-silicon alloy materials and their preparation, can solve problems such as high solid solubility and lower alloy conductivity, and achieve the effects of increasing conductivity, reducing porosity, and improving conductivity

Inactive Publication Date: 2015-01-07
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the characteristics of the spray forming process, although the silicon phase is significantly refined, the prepared aluminum-silicon alloy still has a certain porosity, and the solid solubility of silicon in the aluminum matrix is ​​high, which greatly reduces the electrical conductivity of the alloy.

Method used

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  • Aluminum-silicon alloy material and preparation method thereof
  • Aluminum-silicon alloy material and preparation method thereof
  • Aluminum-silicon alloy material and preparation method thereof

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Effect test

Embodiment 1

[0035] The pure aluminum ingots with a purity of not less than 99.5wt%, pure silicon and massive lanthanum-cerium mixed rare earths were formulated as Al-20Si-0.2RE to prepare the composition of the master alloy sample, with a total of 5 kg. Since Si has a high melting point and is easy to float above the Al liquid, the bulk Si is broken into small particles with a diameter of about 10-30mm before smelting. After the pure aluminum is completely melted, pure silicon is added several times, and the alloy melt is stirred repeatedly to ensure that the Si floating on the upper layer of the Al liquid is melted and evenly distributed. After the Al and Si are completely melted, the mixed rare earth is added in the form of a block, and the electromagnetic stirring is evenly mixed, and then poured into the sand precision mold, cooled to room temperature, and demolded to obtain the cast Al-20Si-0.2RE alloy sample, SEM Backscattered images such as image 3 shown. The alloy ingots obtain...

Embodiment 2

[0052] The pure aluminum ingots with a purity of not less than 99.5wt%, pure silicon and massive lanthanum-cerium mixed rare earths were formulated as Al-20Si-0.35RE to prepare the composition of the master alloy sample, totaling 5 kg. Since Si has a high melting point and is easy to float above the Al liquid, the bulk Si is broken into small particles with a diameter of about 10-30mm before smelting. After the pure aluminum is completely melted, pure silicon is added several times, and the alloy melt is stirred repeatedly to ensure that the Si floating on the upper layer of the Al liquid is melted and evenly distributed. After the Al and Si are completely melted, the mixed rare earth is added in the form of lumps, and mixed evenly by electromagnetic stirring, and then poured into a sand precision mold, cooled to room temperature, and demolded to obtain a cast Al-20Si-0.35RE alloy sample. The alloy ingots obtained by smelting are broken, and the broken block alloys are placed ...

Embodiment 3

[0062]The pure aluminum ingots with a purity of not less than 99.5wt%, pure silicon and massive lanthanum-cerium mixed rare earths were formulated as Al-20Si-0.5RE to prepare the composition of the master alloy sample, with a total of 5 kg. Since Si has a high melting point and is easy to float above the Al liquid, the bulk Si is broken into small particles with a diameter of about 10-30mm before smelting. After the pure aluminum is completely melted, pure silicon is added several times, and the alloy melt is stirred repeatedly to ensure that the Si floating on the upper layer of the Al liquid is melted and evenly distributed. After the Al and Si are completely melted, the mixed rare earth is added in the form of lumps, and mixed evenly by electromagnetic stirring, and then poured into a sand precision mold, cooled to room temperature, and demolded to obtain a cast Al-20Si-0.5RE alloy sample. The alloy ingots obtained by smelting are broken, and the broken block alloys are pla...

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Abstract

The invention relates to a novel aluminum-silicon alloy material and a preparation method thereof. The aluminum-silicon alloy material comprises the following components: 15-20wt% of silicon, 0.2-0.5wt% of mischmetal and the balance of aluminum and inevitable impurities. The preparation method comprises the following steps of smelting pure aluminum, pure silicon and lanthanum-cerium mischmetal, casting, cooling and demolding to obtain a hypereutectic aluminum-silicon alloy ingot containing 20wt% of silicon and 0.2-0.5wt% of mixed mischmetal; crushing and cleaning the alloy ingot; carrying out spray molding to prepare a hypereutectic aluminum-silicon alloy deposition billet body, carrying out hot-pressing densification on deposition billet body to obtain a densified alloy block material and further carrying out hot-pressing extension on the densified alloy sample twice to obtain the densified hypereutectic aluminum-silicon alloy block material sample, namely, the novel aluminum-silicon alloy material. Compared with the prior art, the novel aluminum-silicon alloy material prepared by virtue of the preparation method, which is disclosed by the invention, has the characteristics of high electrical conductivity and good mechanical properties and mainly used for manufacturing automotive engine piston, air compressors and anti-wear pieces in other industries.

Description

technical field [0001] The invention relates to an aluminum alloy material and a preparation method thereof, in particular to an aluminum-silicon alloy material and a preparation method thereof. Background technique [0002] Hypereutectic aluminum-silicon alloy has the characteristics of low density, good thermal conductivity, small thermal expansion coefficient, wear resistance, corrosion resistance, and good dimensional stability. It is a promising aluminum alloy material. In recent years, the application of automobile engines including Germany, Japan, the United States and South Korea has developed rapidly, and is widely used in the automobile industry, aerospace, electronic packaging and other industries, and because of its high conductivity, it has great potential in the field of electrical materials Application prospect. [0003] Although the hypereutectic Al-Si alloy has developed very rapidly in recent years, it also faces many bottlenecks and technical difficulties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C1/03C22C21/02C22F1/043
Inventor 陆伟凌敏黄平贾敏王宇鑫严彪
Owner TONGJI UNIV
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