Near-net-shape preparation method of Foamed aluminium component

A foamed aluminum and component technology, which is applied in the field of porous foamed metal material preparation, can solve the problems of high cost, low output, difficulty in preparing large-volume aluminum foamed components, etc., and achieves the effect of increasing output and reducing cost

Inactive Publication Date: 2008-05-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder densification foaming method has defects such as high cost, low output, and difficulty in preparing large-volume aluminum foam components because the raw material used is aluminum or aluminum alloy powder, and is limited by the powder processing technology itself.

Method used

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  • Near-net-shape preparation method of Foamed aluminium component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 8wt.% alumina (particle size: -100 mesh) after pure aluminum is melted and kept at 720°C for half an hour, then stir to increase viscosity (stirring time: 5min., stirring speed: 3000r / min.), and then add oxidation treated blowing agent TiH 2 (2.5wt.%, particle size -200 mesh, pre-oxidation treatment at 420°C for 8h + 550°C for 2h), stirring and dispersing (stirring time: 40s, stirring speed: 2500r / min.), casting and cooling to obtain a porosity of 15% For the casting, the casting is extruded (extrusion ratio: 20, extrusion temperature: 100° C.) to obtain a dense foam precursor (a round rod with a diameter of 10 mm), and the round rod with a diameter of 10 mm is cut into a cylinder with a height of 15 mm. Put the block into a foaming mold (diameter 30mm, height 60mm) at 680°C for 6min. to obtain a cylindrical aluminum foam with a diameter of 30mm, a height of 60mm, an average pore diameter of 4.0mm, and a porosity of 84%.

Embodiment 2

[0013] A1Si6 alloy was melted at 700°C for half an hour, added 6wt.% alumina (particle size: -200 mesh) and stirred to increase viscosity (stirring time: 8min., stirring speed: 2500r / min.), and then added the oxidation-treated hair Foaming agent (1.8wt.%, particle size -300 mesh, pre-oxidized at 410°C for 6h + 520°C for 2h), stirred and dispersed (stirring time: 50s, stirring speed: 3000r / min.), casting and cooling to obtain porosity 13% of the casting, the casting is rolled (reduction: 50%, rolling temperature: 200°C) to obtain a dense foam precursor (10mm thick plate), which is cut into a 10mm high, 30mm wide, and 30mm long Put the slab into a foaming mold at 680°C (the inner cavity size is 30mm in length and width, and 50mm in height) for foaming for 8 minutes. You can get 30mm in length and width, 50mm in height, an average pore diameter of 3.5mm, and a porosity of 80%. cuboid aluminum foam.

Embodiment 3

[0015] ZLD104 alloy was melted at 690°C for half an hour, then added 4wt.% alumina (particle size: -300 mesh), then stirred to increase viscosity (stirring time: 15min., stirring speed: 1000 / min.), and then added pre-oxidation treatment blowing agent TiH 2 (1.5wt.%, particle size -200 mesh, after oxidation treatment at 400°C for 8h + 500°C for 2h), stirring and dispersing (stirring time: 70s, stirring speed: 4000r / min.), casting and cooling to obtain a casting with a porosity of 12% , Extrude the casting (extrusion ratio: 30, extrusion temperature: 350°C) to obtain a dense foaming precursor (a round rod with a diameter of 10mm), cut the round rod with a diameter of 8mm into 20 cylinders with a height of 20mm, Put it into a muffler foaming mold at 670°C (inner cavity diameter 58mm, inner cavity height 60mm) and foam for 10 minutes. The foamed aluminum alloy muffler shown in Figure 2 can be obtained.

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Abstract

A method for preparing a near-net-shape foam aluminum part belongs to the preparation field of the porous foam metal material. The process steps of the method comprise that aluminum or aluminum alloy is heated and melted and adhesion promoter is added first for mixing and tackifying; and then the vesicant which is oxidated is added and the vesicant is mixed and dispersed fast; the tackifying molten metal which contains the vesicant is cast and cooled to obtain the cast which is provided with a void factor; the cast is compressed to obtain the compact foam precursor and the foam precursor is processed and put in a pattern die for heating and foaming to obtain the foam aluminum part which is provided with the needed pattern and hole structure. The invention is characterized by simple process and low cost and overcomes the detects of the conventional powder working process; in this way, large foam aluminum part can be obtained and large-scale production can be realized.

Description

technical field [0001] The invention belongs to the field of preparation of porous foamed metal materials, in particular to a method for preparing a near-net shape of a foamed aluminum component. Background technique [0002] The currently known method of preparing foamed aluminum components near net shape is powder densification foaming method (or powder metallurgy foaming method), the main process of which is: using aluminum or aluminum alloy powder as raw material, mixing a certain proportion of foaming agent , mix metal powder and foaming agent evenly, and use powder compaction, powder extrusion or powder rolling to densify to obtain a foaming precursor, and the foaming precursor is foamed in a mold at a certain temperature to obtain a foamed aluminum component . Because the powder densification foaming method uses aluminum or aluminum alloy powder as the raw material, and is limited by the powder processing technology itself, there are defects such as high cost, low ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22D21/04
Inventor 左孝青张帆陆建生周芸
Owner KUNMING UNIV OF SCI & TECH
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