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Preparation method of novel thin-walled and special-shaped foamed aluminum part

A technology for foamed aluminum and special-shaped parts, which is applied in the field of porous metal materials, can solve the problems of hindering the industrialization process of thin-walled special-shaped parts of foamed aluminum, complex shapes of special-shaped parts, reducing production efficiency, etc., and achieves high utilization rate of foaming agent and melting time. Short, fast heat-absorbing effect

Active Publication Date: 2017-02-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Preparation method of novel thin-walled and special-shaped foamed aluminum part
  • Preparation method of novel thin-walled and special-shaped foamed aluminum part

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preparation example Construction

[0030] The present invention is a kind of preparation method of novel foamed aluminum thin-wall special-shaped parts, and the steps of the method are as follows:

[0031] (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.

[0032] (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 ra...

Embodiment 1

[0039] Preform preparation:

[0040] 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

[0044] Preform preparation:

[0045] 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 preparation method for a novel thin-walled and special-shaped foamed aluminum part, and belongs to the technical field of porous metal materials. A three-step forming technique is adopted based on preparation of a foaming preformed blank, namely a multi-pass drawing procedure is added based on traditional cold-pressing and hot-extruding procedures, and the linear foaming preformed blank with the diameter being 2-5 mm is prepared. In the preparation process of the thin-walled and special-shaped part, the linear foaming preformed blank with the proper diameter is selected according to the wall thickness of the special-shaped part and the density requirement for a core foam body, the linear foaming preformed blank with the proper diameter is placed in a metal cavity combined with the linear forming preformed blank after being folded in a reasonable folding way, and then the linear foaming preformed blank with the proper diameter and the metal cavity are placed into a holding furnace together for heat-preservation foaming; and the procedure of preparing a plurality of small-size foaming preformed blanks required by a multi-blank foaming method by consuming a large amount of time is not needed any more. By adoption of the preparation method for the novel thin-walled and special-shaped foamed aluminum part, the production efficiency is greatly improved, the production cost is reduced, and the preparation method has extremely positive significance for promoting the industrialization process of thin-walled and special-shaped foamed aluminum parts.

Description

technical field [0001] The invention relates to a preparation method of a novel aluminum foam thin-wall special-shaped part, belonging 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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