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Preparing method for surface aluminum-silicon alloy

A technology of aluminum-silicon alloy and aluminum alloy plate, which is applied in the coating process and coating of metal materials, can solve the problems of porosity and porosity, the easy formation of cracks in the strengthening layer, and the aggregation and coarsening of local silicon particles, so as to achieve a refined structure , The effect of eliminating metallurgical defects

Active Publication Date: 2016-05-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty in controlling the microstructure of Al-Si alloys, the main problems in the laser alloying process include: local silicon particle aggregation and coarsening, easy formation of cracks, pores and porosity in the strengthening layer.

Method used

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  • Preparing method for surface aluminum-silicon alloy
  • Preparing method for surface aluminum-silicon alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, pure aluminum alloy is used as the base material, and the size is a flat plate of 100×150 mm, and the thickness is 6 mm.

[0028] (1) First, clean the surface of the aluminum plate to remove surface pollutants and oxides; then, add 10-20 μm silicon particles into methanol and mix evenly to obtain a slurry; apply the slurry to the surface of the cleaned sample, and dry it Low-temperature drying treatment in the dry box, forming a silicon particle coating with a thickness of 0.5mm on the surface of the sample;

[0029] (2) Use YAG pulse laser to scan the surface of the sample line by line. The single pulse molten pool and the adjacent scanning lanes overlap each other to form a continuous molten pool, so that the entire surface layer of the material is melted area by area, and then naturally cooled, in the sample. An aluminum-silicon alloy layer is formed on the surface;

[0030] The average output power of the pulsed laser is 250W, the pulse frequenc...

Embodiment 2

[0034] In this embodiment, 5051 deformed aluminum alloy is used as the base material, the size is 100×150mm flat plate, and the thickness is 10mm.

[0035] (1) First, clean the surface of the aluminum alloy plate to remove surface pollutants and oxides; then, add 10-20 μm silicon particles into methanol to obtain a uniformly mixed slurry; apply the slurry on the surface of the cleaned sample, And dry at low temperature in a drying oven to form a silicon particle coating with a thickness of 1.5mm on the surface of the sample;

[0036] (2) Use YAG pulse laser to scan the surface of the sample line by line. The single pulse molten pool and the adjacent scanning lanes overlap each other to form a continuous molten pool, so that the entire surface layer of the material is melted area by area, and then naturally cooled, in the sample. An aluminum-silicon alloy layer is formed on the surface;

[0037] The average output power of the pulsed laser is 500W, the pulse frequency is 30Hz,...

Embodiment 3

[0041] In this embodiment, A356 aluminum alloy is used as the base material, and the size is a flat plate of 100×150 mm, and the thickness is 16 mm.

[0042] (1) First, clean the surface of the aluminum alloy plate to remove surface pollutants and oxides,

[0043] Then, add 10-20 μm silicon particles into methanol, mix evenly to get a slurry; apply the slurry on the surface of the clean sample, and dry it in a drying oven at low temperature to form a silicon particle coating with a thickness of 3mm on the surface of the sample ;

[0044] (2) Use YAG pulse laser and TIG arc composite heat source to scan the sample surface line by line, and overlap and overlap the single pulse molten pool and adjacent scanning channels to form a continuous molten pool, so that the entire surface layer of the material is melted area by area, realizing the whole Laser modification of the surface, followed by natural cooling, forms an aluminum-silicon alloy layer on the surface of the sample.

[00...

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Abstract

The invention discloses a preparing method for a surface aluminum-silicon alloy. The preparing method is characterized in that firstly, after the surface of an aluminum plate or an aluminum alloy plate is cleaned, and silica particles are evenly coated on the surface; then a pulse laser or a pulse laser arc composite heat source acts on the surface of a coating, and line-by-line scanning and natural cooling are carried out, so that a single-point molten pool and surrounding adjacent molten pools are stacked and jointed to form a stable continuous molten pool, and an aluminum-silicon alloy layer is formed on the surface of a sample; and finally, through friction stir processing, a compact surface aluminum-silicon alloy material with the surface layer thickness ranging from 1 mm to 10 mm and the silica particle volume fraction ranging from 5% to 50% is finally obtained. The silica particles in the obtained aluminum-silicon alloy material are small and even, and bonding between the silica particles and an aluminum matrix is good.

Description

technical field [0001] The invention relates to the technical field of production and preparation of aluminum-silicon alloys, in particular to a method for preparing surface aluminum-silicon alloys. Background technique [0002] In the process of industrial production, the surface of mechanical parts is most prone to friction and wear, which leads to the failure of key components. The preparation of aluminum-silicon material on the surface of aluminum alloy by surface modification technology can combine excellent aluminum alloy processing formability and aluminum-silicon alloy wear resistance, effectively improve the wear resistance of the surface of mechanical components, and greatly increase its service life. The shape, size and distribution of silicon particles in the surface aluminum-silicon alloy are the key factors affecting its wear resistance. The coarse silicon phase with uneven distribution is easy to fall off from the soft aluminum matrix, so that the wear resista...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 华鹏吴玉程周伟
Owner HEFEI UNIV OF TECH
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