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Method for preparing porous aluminum alloy by using hollow microspheres

A hollow microsphere, aluminum alloy technology, applied in the field of metal functional materials, can solve the problem of removing pore-forming agent, etc., and achieve the effects of low cost, simple process and flexible operation

Active Publication Date: 2020-10-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current preparation methods mainly include infiltration casting method, melt foaming method and selective laser melting method, etc., but these methods cannot completely solve two problems, one is the complete removal of the pore-forming agent, and the other is the precision of the size and shape of the pores control

Method used

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  • Method for preparing porous aluminum alloy by using hollow microspheres
  • Method for preparing porous aluminum alloy by using hollow microspheres
  • Method for preparing porous aluminum alloy by using hollow microspheres

Examples

Experimental program
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Embodiment 1

[0039] Alumina hollow microspheres with an outer diameter of 50 μm and a wall thickness of 2 μm were used as pore-forming agents. Under argon protection, the alumina hollow microspheres and 25 μm 2A12 aluminum alloy powder were mixed in a volume ratio of 3:7 in a glove box. Put it into a closed container, and then fully mix the materials to obtain uniformly mixed alumina hollow microspheres + aluminum alloy precursor powder. Using vacuum hot pressing sintering, the alumina hollow microspheres + aluminum alloy precursor powder are evenly put into the mold, the sintering temperature is controlled at 630°C, the holding time is 3h, and the pressure is 1MPa to obtain a uniform porosity of about 30%. Porous aluminum alloy with spherical pores (the deviation between the actual porosity and the designed porosity is less than 5%). Taking the product obtained in Example 1 as the processing object, it was subjected to a compression performance test; when the compressive strength reached ...

Embodiment 2

[0042] Alumina hollow microspheres with an outer diameter of 100 μm and a wall thickness of 5 μm were used as pore-forming agents. Under argon protection, the alumina hollow microspheres and 18 μm 2024 aluminum alloy powder were mixed in a volume ratio of 1:1 in a glove box. Put it into a closed container, and then fully mix the materials to obtain uniformly mixed alumina hollow microspheres + aluminum alloy precursor powder. Vacuum hot pressing sintering is used to uniformly put alumina hollow microspheres + aluminum alloy precursor powder into the mold, control the sintering temperature to 600°C, hold time for 2h, and pressure at 5MPa to obtain a uniform porosity of about 20%. Porous aluminum alloy with spherical pores (the deviation between the actual porosity and the designed porosity is less than 4%).

[0043]The product developed in Example 2 can be used for energy-absorbing parts of vehicles.

Embodiment 3

[0045] Alumina hollow microspheres with an outer diameter of 50 μm and a wall thickness of 3 μm were used as pore-forming agents. Under argon protection, the alumina hollow microspheres and 10 μm 2A12 aluminum alloy powder were mixed in a volume ratio of 2:3 in a glove box. Put it into a closed container, and then fully mix the materials to obtain uniformly mixed alumina hollow microspheres + aluminum alloy precursor powder. Using vacuum hot pressing sintering, put alumina hollow microspheres + aluminum alloy precursor powder evenly into the mold, control the sintering temperature to 620°C, hold time for 2h, and pressure at 2MPa to obtain a uniform porosity of about 50%. Porous aluminum alloy with spherical pores (the deviation between the actual porosity and the designed porosity is less than 5%).

[0046] The product developed in Example 3 can be used for energy-absorbing components of vehicles.

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Abstract

The invention relates to a method for preparing porous aluminum alloy by using hollow microspheres. The method is characterized by comprising the following steps of adopting the aluminum oxide (Al 2O3) hollow microspheres as pore-forming agents, putting the aluminum oxide hollow microspheres and aluminum alloy powder into a closed container according to a certain volume ratio in a glove box undera protective atmosphere, and fully mixing the materials to obtain uniformly mixed aluminum oxide hollow microspheres and aluminum alloy precursor powder; and adopting vacuum hot pressing sintering, uniformly placing the aluminum oxide hollow microspheres and aluminum alloy precursor powder into a mold, controlling sintering parameters and pressure, and obtaining the porous aluminum alloy providedwith uniform spherical pores with certain porosity. The method for preparing the porous aluminum alloy by using the hollow microspheres solves the problems that the pore-forming agents are difficultto remove and the size and shape of the pores are difficult to control accurately, and the prepared porous aluminum alloy is uniform in pore distribution, the pores are spherical and the aperture is in micron size. The process is simple, the operation is flexible, and the cost is low.

Description

technical field [0001] The invention relates to a method for preparing porous aluminum alloys by using hollow microspheres, in particular to aluminum oxide (Al 2 o 3 ) The hollow microsphere is a pore-forming agent without removing the pore-forming agent, and the method for preparing porous aluminum alloy by vacuum hot-pressing sintering belongs to the technical field of metal functional materials. Background technique [0002] Porous aluminum alloys are widely used in aerospace, electronics, construction and other fields because of their excellent properties such as low density, high specific stiffness, high damping performance and high impact energy absorption rate. [0003] The pore size and pore shape of porous aluminum alloys have a great influence on the microstructure and properties. The mechanical properties of sintered porous materials not only decrease with the increase of porosity and pore diameter, but also are very sensitive to the shape of the pores, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C21/00
CPCB22F3/11C22C21/00
Inventor 刘文胜赵心阅马运柱刘超王涛颜焕元伍镭杨伦
Owner CENT SOUTH UNIV
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