A kind of preparation method of aluminum foam thin-wall special-shaped parts

A technology for special-shaped parts and foamed aluminum, which is applied in the field of preparation of thin-walled special-shaped parts of foamed aluminum, can solve the problems of hindering the industrialization process of thin-walled special-shaped parts of foamed aluminum, complicated shapes of special-shaped parts, reducing production efficiency, etc., and achieves the utilization of foaming agent. The effect of high rate, short melting time and fast heat absorption

Active Publication Date: 2018-11-06
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, in the traditional powder metallurgy method, the foamable precursor prepared by unidirectional molding or extrusion is directly placed in a closed cavity for heat preservation and foaming. Due to the complex shape of the special-shaped parts, multiple preforms are often required. Only by foaming the green body can it be realized
And when the wall thickness of the special-shaped part is small, the size of the required foamable precursor is also small and the quantity is large, and it often takes a long time to prepare, which greatly reduces the production efficiency, increases the production cost, and seriously hinders the foaming process. Industrialization Process of Aluminum Thin-wall Special-shaped Parts

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  • A kind of preparation method of aluminum foam thin-wall special-shaped parts
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preparation example Construction

[0028] The present invention is a kind of preparation method of aluminum foam thin-wall special-shaped part, and the method step is as follows:

[0029] (1) Mixing of powder materials: firstly mix the foaming agent TiH 2 The powder is heated and oxidized in air at 480°C for 120 minutes, and then sieved by a vibrating sieve to select TiH with a particle size below 25 μm 2 The granules are used as a foaming agent, which is added to the matrix aluminum powder in a proportion of 0.1-0.2% by mass, and finally the mixed powder is mixed on a ball mill for 120 minutes.

[0030] (2) Preparation of prefabricated body: The prefabricated body is prepared in three steps: the first step is to press the mixed powder into a high-density cold-pressed billet by means of 500MP cold pressing. The second step is to put the cold compact in the holding furnace and heat it at 400°C for 90-120 minutes, and then quickly transfer it to the extrusion die for extrusion. The extrusion ratio of the extrusi...

Embodiment 1

[0037] Preform preparation:

[0038] TiH with a particle size of less than 25 μm after heating and oxidation treatment at 480°C for 120 minutes 2 Powder and aluminum powder were mixed on a drum mixer, and the mixing time was 120 minutes, in which TiH 2 The addition amount is 0.1%, and the balance is aluminum powder. Next, put the uniformly mixed powder into a cylindrical mold, pressurize to 500 MPa, hold the pressure for 10 minutes, and press the mixed powder into a cylindrical cold compact. After demoulding, put the cold compact into a 400°C holding furnace for heat preservation and heating for 120 minutes, and then quickly transfer it to a 30:1 preheated extrusion die for hot extrusion (the preheating of the extrusion die and the indenter The heating temperature is 390°C), and an extruded billet with a diameter of 12mm is prepared. Finally, multi-pass drawing is carried out on the extruded billet. The preform is heated at 400°C for 60 minutes before the first pass and the...

Embodiment 2

[0042] Preform preparation:

[0043] TiH with a particle size of less than 25 μm after heating and oxidation treatment at 480°C for 120 minutes 2 Powder and aluminum powder were mixed on a drum mixer, and the mixing time was 120 minutes, in which TiH 2 The addition amount is 0.2%, and the balance is aluminum powder. Next, put the uniformly mixed powder into a cylindrical mold, pressurize to 500 MPa, hold the pressure for 10 minutes, and press the mixed powder into a cylindrical cold compact. After demoulding, put the cold compact into a 400°C holding furnace for heat preservation and heating for 90 minutes, and then quickly transfer it to a 30:1 preheated extrusion die for hot extrusion (the preheating of the extrusion die and the indenter The heating temperature is 390°C), and an extruded billet with a diameter of 15mm is prepared. Finally, multi-pass drawing is carried out on the extruded billet. The preform is heated at 400°C for 60 minutes before the first pass and the ...

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Abstract

The invention relates to a method for preparing foamed aluminum thin-walled special-shaped parts, and belongs to the technical field of porous metal materials. In the preparation of the foamable preform, a three-step molding process is adopted, that is, on the basis of the traditional cold pressing + hot extrusion, a multi-pass drawing process is added to prepare a linear shape with a diameter of 2-5mm. Foamable preforms. In the process of preparing thin-walled special-shaped parts, it is only necessary to select a linear foamable preform with a suitable diameter according to the wall thickness of the special-shaped part and the density requirements of the core layer foam. In the metal cavity, they can be put together in the holding furnace for heat preservation and foaming, and there is no need to spend a lot of time to prepare multiple small-sized foamable preforms required by the multi-body foaming method. The invention greatly improves the production efficiency, reduces the production cost, and has very positive significance for promoting the industrialization process of foamed aluminum thin-wall special-shaped parts.

Description

technical field [0001] The invention relates to a method for preparing foamed aluminum thin-walled special-shaped parts, and belongs to the technical field of porous metal materials. Background technique [0002] Foamed aluminum special-shaped parts are three-dimensional structures with foamed aluminum as the core material formed by compounding foamed aluminum and certain materials (steel, aluminum, copper, etc.). It not only has the characteristics of light weight, high specific strength, sound absorption, heat insulation, flame retardant, vibration reduction, damping, shock absorption and other excellent performances of aluminum foam, but also solves the disadvantage of low strength of single foam aluminum. A new type of lightweight material with excellent comprehensive performance. Therefore, it has huge development potential and broad application prospects in transportation, aviation, aerospace and other industries, especially in the automobile industry. [0003] As a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11
CPCB22F3/1125
Inventor 郭志强冯展豪袁晓光东雪黄宏军左晓姣
Owner SHENYANG POLYTECHNIC UNIV
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