Preparation method of silicon-aluminum alloy

A silicon-aluminum alloy and silicon-aluminum technology, applied in the field of material preparation, can solve problems such as insufficient density

Inactive Publication Date: 2013-10-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a method for preparing silicon-aluminum alloys, using friction stir processing technology to refine the microstructure of silicon-aluminum alloys, that is, conventional casting techniques

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment includes the following steps:

[0016] Step 1. First, prepare a silicon-aluminum material with a silicon mass percentage of 50% and a silicon particle size of 0.1-1 mm by powder metallurgy;

[0017] Specifically: 50% of the total weight of silicon powder with a particle size of 45-100 μm and 50% of the total weight of aluminum powder with a particle size of 45-100 μm are uniformly mixed in a powder mixer, and 2wt% can be added during the mixing process. agent or granulation, and then undergo 40MPa cold pressing and 1000°C vacuum sintering to obtain silicon-aluminum block materials;

[0018] Step 2. The silicon-aluminum material in step 1 is subjected to friction stir treatment to obtain a dense silicon-aluminum composite material with a silicon mass percentage of 50% and a silicon phase size of 0.5-50 μm.

[0019] The friction stir treatment is as follows: fix the silicon-aluminum block on the workbench, use H13 steel tool as the friction head, the axia...

Embodiment 2

[0021] This embodiment includes the following steps:

[0022] Step 1. First, the silicon-aluminum material is prepared by powder metallurgy. Evenly mix silicon powder with a mass percentage of 60% and a particle size of 74-150 μm and aluminum powder with a particle size of 40% of the total weight and a particle size of 74-150 μm. Sintering in an air atmosphere for 2-8 hours, and then hot-pressing and densifying at 500°C to obtain a silicon-aluminum block material;

[0023] Step 2. The silicon-aluminum material obtained in step 1 is welded on the surface of the aluminum sheet by vacuum brazing; the brazed material is subjected to friction stir treatment: 5CrNiMo hot-working die steel tool is used as the friction head, and the friction head is applied on the surface of the workpiece. The axial force is 60KN, the lateral thrust of the table is 20KN, the rotational speed of the friction head is 800 rpm, and the scanning speed of the friction head on the sample surface is 200 mm / m...

Embodiment 3

[0025] This embodiment includes the following steps:

[0026] Step 1. First, the silicon-aluminum material is prepared by powder metallurgy. 70% of the total weight of silicon powder with a particle size of 45-74 μm is uniformly mixed with 30% of the total weight of aluminum powder with a particle size of 74-150 μm. Sinter in the atmosphere for 2-8 hours, and then densify by hot pressing at 600°C.

[0027] Step 2. The silicon-aluminum material obtained in step 1 is laser-welded on the surface of the copper sheet, and the welded material is subjected to friction stir treatment: the silicon-aluminum / copper block is fixed on the workbench, and tools made of YG8 hard alloy are used as The friction head, the axial force applied by the friction head on the workpiece surface is 60KN, the lateral thrust of the worktable is 25KN, the rotation speed of the friction head is 600 rpm, and the scanning speed of the friction head on the sample surface is 200 mm / min. After a complete scan, ...

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Abstract

The invention relates to a preparation method of a silicon-aluminum alloy, which comprises steps as follows: a casting or powder metallurgy process is utilized to prepare a silicon-aluminum material of which the mass percent of silicon is 25-90% and the silicon phase dimension is 0.1-20 mm; the prepared silicon-aluminum material can be further welded onto an aluminum sheet, copper sheet, silicon sheet, silicon carbide sheet, germanium sheet, gallium arsenide sheet, gallium nitride sheet or aluminum nitride sheet; and the independent silicon-aluminum block material or silicon-aluminum layer welded on the aluminum sheet, copper sheet, silicon sheet, silicon carbide sheet, germanium sheet, gallium arsenide sheet, gallium nitride sheet or aluminum nitride sheet is subjected to stirring friction to obtain the compact silicon-aluminum composite material of which the mass percent of silicon is 25-90% and the silicon phase dimension is 0.5-50 mu m. The silicon-aluminum material can independently form a block or be compounded on the surface of the aluminum sheet, copper sheet, silicon sheet, silicon carbide sheet, germanium sheet, gallium arsenide sheet, gallium nitride sheet or aluminum nitride sheet.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for preparing a silicon-aluminum alloy with a silicon mass fraction of 25-90%. Background technique [0002] Silicon / aluminum alloys containing 25-90% silicon (the rest is aluminum) have the characteristics of light weight and high thermal conductivity, and are widely used in automobiles, aviation, aerospace, radar and civilian electronics industries. However, the manufacturing process of silicon-aluminum alloy is extremely difficult. In the structure of silicon-aluminum alloy prepared by conventional casting technology and powder metallurgy technology, polygonal or plate-shaped primary silicon and needle-shaped eutectic silicon are often easy to appear. The thermal conductivity of the material is severely inhomogeneous and the mechanical properties of the material are reduced, which limits the application of conventional casting and powder metallurgy techno...

Claims

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Application Information

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IPC IPC(8): C22F1/043
Inventor 王亚平
Owner XI AN JIAOTONG UNIV
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