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Foamed aluminum sandwich structure composite material and preparing method thereof

A composite material and sandwich structure technology, applied in the field of materials, can solve problems such as interface debonding damage, and achieve the effects of improving the interface bonding strength, reducing the preparation cost and improving the preparation efficiency.

Active Publication Date: 2017-01-04
SHENZHEN ACAD OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems, the present invention discloses an aluminum foam sandwich structure composite material and its preparation method, which solves the problem that the traditional sandwich structure composite material is prone to interface debonding and damage under impact or humid heat environment

Method used

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  • Foamed aluminum sandwich structure composite material and preparing method thereof
  • Foamed aluminum sandwich structure composite material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The closed-cell foamed aluminum with a thickness of 20mm and a density of 0.30g / cm3 is treated with potassium dichromate etching solution, rinsed with tap water, then thoroughly cleaned with deionized water, and dried in an oven at 60°C for use.

[0049] Epoxy resin E51: epoxy nitrile prepolymer: glycidyl acrylate: glass microspheres: chopped aramid fiber: m-phenylenediamine: boron trifluoride monoethylamine by weight ratio 100:10:10: 70:10:10:1, using mechanical stirring to evenly fill the prepared resin system in the pores on the surface of aluminum foam by scraping.

[0050] The upper and lower surfaces of the processed aluminum foam are sequentially covered with aluminum fiber mesh impregnated with resin, 2 layers of carbon fiber prepreg and 2 layers of glass fiber prepreg, and put into a flat mold for hot pressing and curing. The curing process is that the hot press heats up from room temperature to 80°C at an average heating rate of 3°C / min, then heats it for 30 m...

Embodiment 2

[0057] The closed-cell aluminum foam with a thickness of 10mm and a density of 0.47g / cm3 is treated with potassium dichromate etching solution, rinsed with tap water, then thoroughly cleaned with deionized water, and dried in an oven at 60°C for use.

[0058] 10 parts of Expancle microspheres, 5 parts of nitrile rubber, 2 parts of chopped basalt fiber, 10 parts of Al 2 o 3 Add the microspheres to 100 parts of epoxy resin TED-85 and 10 parts of glycerol triglycidyl ether and mix well, then add 30 parts of 4,4-diaminodiphenylmethane and 1 part of 2-ethyl-4 -Methylimidazole is fully stirred evenly by mechanical stirring. Under the action of ultrasound, soak the foamed aluminum in the resin system for 10 minutes and lift it out, and scrape off the excess resin on the surface.

[0059] Copper fiber mesh impregnated with resin, carbon fiber prepreg, aramid fiber prepreg and high-strength glass fiber prepreg are sequentially laid on the upper and lower surfaces of the treated foame...

Embodiment 3

[0062] The closed-cell aluminum foam with a thickness of 20mm and a density of 0.70g / cm3 is treated with potassium dichromate etching solution, rinsed with tap water, then thoroughly cleaned with deionized water, and dried in an oven at 60°C for use.

[0063] Add 30 parts of 4,4 -Diaminodiphenyl sulfone and 2 parts of 2-phenylimidazoline are stirred evenly, and the resin system is filled into the surface pores of the foamed aluminum by the pouring method, and the resin-impregnated stainless steel fiber mesh and basalt are sequentially laid on the upper and lower surfaces of the treated foamed aluminum The fiber prepreg is put into the mold for vacuum bag pressure curing molding, the curing temperature is 120 ° C, the curing pressure is 0.1 MPa, and it is kept for 30 minutes and then cooled to 80 ° C. Compared with polyurethane foam commonly used in traditional closed-cell foam core materials, the aluminum foam sandwich composite material prepared in this example has a smooth s...

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Abstract

The invention provides a foamed aluminum sandwich structure composite material and a preparing method thereof. The foamed aluminum sandwich structure composite material comprises a foamed aluminum core material, a toughening interface layer and skin, wherein the toughening interface layer is located between the foamed aluminum core material and the skin, the toughening interface layer is made of an epoxy resin composite material, and the epoxy resin composite material is composed of an epoxy resin matrix, a toughening agent, a diluent, hollow microspheres, chopped fiber, a curing agent and an accelerant; pores in the surface of the foamed aluminum core material is filled with the epoxy resin composite material to form the toughening interface layer. According to the technical scheme, the toughening interface layer is formed between the composite material skin and the foamed aluminum core material by means of multi-component low-density epoxy filling adhesive, and interface bonding strength can be effectively improved; by means of the skin designed based on functional gradient, the interface bonding property of the foamed aluminum sandwich structure in a humid and hot environment is improved, and the impact resistance of the foamed aluminum sandwich structure is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to an aluminum foam sandwich structure composite material and a preparation method thereof. Background technique [0002] Sandwich structure composites are composed of a thin, high-strength skin and a low-density core. Due to its outstanding advantages such as high specific stiffness and light weight, it has been widely used in aerospace, automobile, rail transit, construction and other engineering fields. The foam core materials used in traditional sandwich structures include polymer foams such as PU, PS, PVC, and PET, but their application fields are limited due to their high temperature resistance and poor flame retardancy. Aluminum foam is formed by adding additives to pure aluminum or aluminum alloy and foaming. It has excellent comprehensive properties such as low density, high temperature resistance, low thermal conductivity, sound insulation and flame retardancy. The app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/14B32B15/20B32B17/02B32B27/02B32B27/32B32B27/34B32B19/00B32B9/04B32B3/08C08L63/00C08L77/10C08L9/02C08L81/06C08L13/00C08K7/20C08K7/18C08K7/10C08K7/28C08K7/06
CPCB32B3/08B32B5/02B32B5/08B32B15/14B32B15/20B32B19/00B32B2260/021B32B2262/0253B32B2262/0261B32B2262/0284B32B2262/10B32B2262/101B32B2262/103B32B2262/106B32B2262/14B32B2307/558B32B2307/718B32B2605/00C08L63/00C08L2205/03C08L77/10C08K7/20C08L9/02C08K7/18C08K7/10C08L81/06
Inventor 晏义伍曹海琳翁履谦赵金华丁小恒
Owner SHENZHEN ACAD OF AEROSPACE TECH
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