Preparation method of foamed aluminum of twenty-four-face spiral body structure

A technology of tetrahedron and helical structure, which is applied in the field of aluminum foam preparation, can solve the problem of inability to achieve precise control of pore distribution and size control, poor porosity, pore structure uniformity and connectivity, and insufficient stability of pore structure forming, etc. problems, to achieve more diverse spatial arrangements, good connectivity, and overall stability

Inactive Publication Date: 2019-03-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing foamed aluminum preparation methods cannot achieve precise control of pore distribution and size control, the pore size is randomly distributed, and the porosity, pore structure uniformity and connectivity are

Method used

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  • Preparation method of foamed aluminum of twenty-four-face spiral body structure
  • Preparation method of foamed aluminum of twenty-four-face spiral body structure
  • Preparation method of foamed aluminum of twenty-four-face spiral body structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1. Use the fused deposition 3D printer to directly print the helical structure of the designed PLA material, with a layered thickness of 0.1mm, a cube in the range of 4×4×4cm, a period parameter of 2, and a surface thickness of 1mm;

[0019] Step 2, fix the spiral structure obtained in step 1 in the mold, pour the mixed gypsum slurry into the mold, the retarder is sodium polyphosphate, the adhesive is epoxy resin, the gypsum slurry, poly The mass ratio of sodium phosphate to epoxy resin is 45:45:10. At the same time, a certain amount of mechanical vibration is applied; after the slurry is hardened, melt the PLA material in a drying oven at 200°C for 20 minutes, then pour the PLA melt, clean it, and then bake it in a roasting furnace at 3°C Raise the temperature to 200°C / min, then raise the temperature to 700°C at 10°C / min, keep it for 5 hours, then cool it down to 300°C at 5°C / min, and hold it for 3 hours to obtain a porous prefabricated block with a helicoid struc...

Embodiment 2

[0024] Step 1. Use the fused deposition 3D printer to directly print the helical structure of the designed PLA material, with a layered thickness of 0.1mm, a cube in the range of 4×4×4cm, a period parameter of 3, and a surface thickness of 1mm;

[0025] Step 2. Fix the spiral structure obtained in step 1 in the mold, pour the mixed gypsum slurry into the mold, the retarder is sodium polyphosphate, and the epoxy resin is the adhesive, and the mass ratio is 45:45 :10. At the same time, a certain amount of mechanical vibration is applied; after the slurry is hardened, melt the PLA material in a drying oven at 200°C for 20 minutes, then pour the PLA melt, clean it, and then bake it in a roasting furnace at 3°C Raise the temperature to 200°C / min, then raise the temperature to 700°C at 10°C / min, keep it for 5 hours, then cool it down to 300°C at 5°C / min, and hold it for 3 hours to obtain a porous prefabricated block with a helicoid structure ;

[0026] Step 3, heating the aluminum...

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Abstract

The invention discloses a preparation method of foamed aluminum of a twenty-four-face spiral body structure. The foamed aluminum is a light structural material based on a twenty-four-face spiral body;and the preparation method of the foamed aluminum comprises the steps that the twenty-four-face spiral body structure is subjected to 3D printing through a polylactic acid (PLA) material; then a PLAtwenty-four-face spiral body gap is filled with gypsum slurry with the high solid phase and low viscosity, and after drying, a required prefabricated type is formed; then PLA in the prefabricated typeis sintered at the low temperature, residue is removed, and then the obtained PLA is placed in a metal mould, prepared aluminum alloy liquid is directly poured, the pressure is applied to the aluminum alloy liquid, and thus holes of a prefabricated block are filled with the metal liquid; and after cooling, gypsum residue in the formed block is removed, and the three-dimensional penetrating through foamed aluminum with certain holes and the twenty-four-face spiral body structure is obtained. By directly controlling the parametric design of the twenty-four-face spiral body structure, the hole diameter size, porosity, air hole shape distribution, apparent density of the foamed aluminum and the like can be accurately controlled, and thus the prepared foamed aluminum meets industrial needs better.

Description

technical field [0001] The invention relates to a method for preparing foamed aluminum, in particular to a method for preparing foamed aluminum with a twenty-four-sided spiral structure. Background technique [0002] Aluminum foam is a new type of lightweight structural functional material with a large number of holes distributed in the aluminum alloy matrix. Compared with solid metal aluminum, it has the characteristics of high porosity, light weight, noise reduction, shock absorption, and electromagnetic shielding. It is often used to make shock-absorbing and energy-absorbing materials, lightweight aviation materials, heat exchangers, sound-absorbing materials, flame arresters, medical implant materials, etc., and has very broad application prospects. There are many methods for preparing foamed aluminum, mainly including: casting method, foaming method, solidification method and powder metallurgy method. However, the pore distribution and size control of the existing alum...

Claims

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Application Information

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IPC IPC(8): B22D25/00C22C21/02
CPCB22D25/005C22C21/02
Inventor 叶喜葱林咸参熊金艳
Owner CHINA THREE GORGES UNIV
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