Low density and small pore size powder metallurgy foam aluminum composite structure preparation method

A powder metallurgy, composite structure technology, applied in the field of porous metal materials, can solve the problems of low density, less pore structure defects, small pore size, etc., and achieve the effects of reducing production costs, increasing stability, and eliminating through holes

Active Publication Date: 2014-02-19
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems existing in the prior art, to provide a preparation method of aluminum foam composite structure, improve the yield of the product, and obtain the density Aluminum foam composite structural parts with low weight, small pore size, less pore structure defects, and high comprehensive performance

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  • Low density and small pore size powder metallurgy foam aluminum composite structure preparation method

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preparation example Construction

[0023] The invention relates to a method for preparing a foamed aluminum composite structure with low density and small aperture powder metallurgy, which is characterized in that the steps of the method are as follows:

[0024] (1) Foaming agent TiH 2 The best choice: use vibrating sieve to select TiH with consistent particle size 2 Powder as foaming agent;

[0025] (2) Preparation of prefabricated body: After mixing aluminum powder, magnesium powder, silicon powder and foaming agent powder in a certain proportion, extrusion molding is used to prepare a foamable prefabricated body;

[0026] (3) Preparation of low-density and small-pore aluminum foam: put the foamable preform into the composite model, after preheating for a period of time, quickly transfer it to the holding furnace for heat preservation and foaming, and foam aluminum can be produced after cooling Composite structure.

[0027] In the above step (1), the vibrating sieve is used for sieving, the sieving time is...

Embodiment 1

[0038] Preform preparation:

[0039] Select 75μm-53μm TiH screened out by vibrating sieve 2 powder, put it into the holding furnace at 480°C for heating and oxidation treatment for 90 minutes, and press TiH after cooling 2 0.3% Mg powder, 4% Mg powder, 7% Si powder and the rest being aluminum powder were mixed on a drum mixer, and the mixing time was 120 minutes. Next, put the uniformly mixed powder into a 10:1 extrusion die, and use a 5000KN metal extruder for extrusion. The extrusion method is to use 400MPa cold extrusion first, and the holding time is 5-10 minutes. The mixed powder is pressed into a dense preform, and then the extrusion mold and the preform are heated to 450°C and then hot extruded. Blank.

[0040] Preparation of aluminum foam composite structure:

[0041] Put the prepared foamable preform into the composite model, and then put it together in a 500°C holding furnace for preheating. After the temperature of the model and preform reaches 500°C, quickly tr...

Embodiment 2

[0044] Select 53μm-37μm TiH screened out by vibrating sieve 2 powder, put it into the holding furnace at 480°C for heating and oxidation treatment for 90 minutes, and press TiH after cooling 2 0.3% Mg powder, 5% Mg powder, 7% Si powder and the rest being aluminum powder were mixed on a drum mixer, and the mixing time was 120 minutes. Next, put the uniformly mixed powder into an extrusion die of 8:1, and carry out extrusion blanking according to the same extrusion process as Example 1.

[0045] Preparation of aluminum foam composite structure:

[0046] Put the prepared foamable preform into the model compounded with it, and then put it together in a 500°C holding furnace for preheating. After the temperature of the model and the preform reach 500°C, quickly transfer to 780°C ℃ in a heating furnace for heat preservation and heating, and the heat preservation time is 110 seconds. Finally, it is taken out from the heat preservation furnace, and the aluminum foam composite struct...

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Abstract

The present invention relates to a low density and small pore size powder metallurgy foam aluminum composite structure preparation method, and belongs to the technical field of porous metal materials. The method comprises: adopting a vibration sieve screening manner to select TiH2 powder with the same size as a foaming agent; then uniformly mixing aluminum powder, magnesium powder, silicon powder and the foaming agent according to a certain ratio, and carrying out extrusion forming to prepare the foamable preform; and finally placing the foamable preform into a mold capable of being compounded with the foamable preform, preheating for a certain time, quickly transferring to a thermal insulation furnace to carry out thermal insulation foaming, and cooling to prepare the foam aluminum composite structure. The foam aluminum material prepared by using the method has characteristics of low density, small pore size, less pore structure defects, high strength and good energy absorption capability, and is suitable for promotion application.

Description

technical field [0001] The invention relates to a method for preparing aluminum foam by powder metallurgy with low density and small aperture, and belongs to the technical field of porous metal materials. Background technique [0002] Aluminum foam composite structure is a sandwich panel or special-shaped piece with foam aluminum as the core material formed by compounding foam aluminum and certain materials (steel, aluminum, copper, etc.). It not only has the characteristics of light weight, high specific strength, energy absorption, sound absorption, flame retardancy, and heat insulation of aluminum foam, but also has the characteristics of excellent mechanical properties such as strength and hardness of composite metal, showing good comprehensive performance. . Therefore, it has broad application prospects in transportation, aviation, aerospace and other industries, especially in the automobile industry. Due to the characteristics of short process and near-net shape, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22F1/00C22C21/08C22C21/02
Inventor 郭志强赵胤袁晓光黄宏军左晓姣东雪
Owner SHENYANG POLYTECHNIC UNIV
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