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Layered type gradient pore structure aluminum or aluminum alloy foam and preparation method

A technology of aluminum alloy foam and gradient pores, which is applied in the field of porous metal materials, can solve the problems of difficult preparation of percolation precursors and control of pore structure, high porosity of polyurethane foam, etc., and achieve good sound absorption performance and simple preparation process.

Active Publication Date: 2019-02-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention is to provide a method for preparing the layered gradient pore structure aluminum or aluminum alloy foam, which overcomes the difficulty in the preparation of the percolation precursor and the control of the pore structure in the preparation of the layered gradient aluminum or aluminum alloy foam by the percolation casting method, The porosity of commercially available polyurethane foam is too high. The layered gradient pore structure of the obtained aluminum or aluminum alloy foam is controllable, and a variety of layered gradient pore structures can be realized. The preparation process is simple and industrial production can be realized; the details include the following step:

Method used

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  • Layered type gradient pore structure aluminum or aluminum alloy foam and preparation method
  • Layered type gradient pore structure aluminum or aluminum alloy foam and preparation method
  • Layered type gradient pore structure aluminum or aluminum alloy foam and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The preparation method of a three-layer gradient pore structure Al-Si12 alloy foam described in this embodiment, the specific steps are:

[0052] (1) Polyurethane foam pore structure control: Three commercially available polyurethane foams with a pore diameter of 1.2mm and a porosity of 91%, a pore diameter of 1.03mm and a porosity of 89.5%, and a pore diameter of 0.9mm and a porosity of 88% were placed in the mass percentage Immerse in 35% water-soluble polyurethane emulsion for 10 minutes, then take out the polyurethane foam and dry it in a drying oven at 80°C for 25 minutes. The pore size and porosity are regulated, and three kinds of polyurethane foams with a pore size of 0.9mm and a porosity of 85%, a pore size of 0.6mm and a porosity of 81.8%, and a pore size of 0.3mm and a porosity of 79% are obtained in sequence.

[0053] (2) Polyurethane foam layered collocation

[0054] The same thickness of polyurethane foam regulated by the above step (1) through the pore s...

Embodiment 2

[0060] The preparation method of a four-layer gradient pore structure ZL101 alloy foam described in this embodiment, the specific steps are:

[0061] (1) Polyurethane foam pore structure control: Four types of polyurethane foam with a pore size of 1.2mm and a porosity of 91%, a pore size of 1.0mm and a porosity of 89%, a pore size of 0.93mm and a porosity of 88.5%, and a pore size of 0.9mm and a porosity of 88% are used in sequence. Put the sold polyurethane foam in 35% water-soluble polyurethane emulsion for 15 minutes, then take out the polyurethane foam and dry it in a drying oven at 70°C for 30 minutes. 2, 3, and 4 times, the pore size and porosity of the polyurethane foam are adjusted, and the pore size is 0.9mm, the porosity is 85%, the pore size is 0.7mm, the porosity is 83%, the pore size is 0.5mm, the porosity is 80.8%, and the pore size is 0.3mm. , four kinds of polyurethane foam with a porosity of 79%.

[0062] (2) Polyurethane foam layered collocation

[0063] Th...

Embodiment 3

[0069] The preparation method of a ZL201 alloy foam with a five-layer gradient pore structure described in this embodiment, the specific steps are:

[0070] (1) Polyurethane foam pore structure control: 1.2mm pore size, 91% porosity, 1.1mm pore size, 90% pore size, 1.0mm pore size, 89% pore size, 1.03mm pore size, 89.5% porosity, and 0.93mm pore size. , five kinds of commercially available polyurethane foams with a porosity of 88.5% were placed in a water-soluble polyurethane emulsion with a mass percentage of 35% and immersed for 20 minutes, then the polyurethane foams were taken out and dried at 60°C for 35 minutes in a drying oven, and the above five polyurethane foams were tested in turn. Repeat the dipping process, the total number of times is 2, 2, 2, 3, 3 times, the pore size and porosity of the polyurethane foam are adjusted, and the pore size is 0.9mm, the porosity is 85%, the pore size is 0.8mm, the porosity is 84%, the pore size Five kinds of polyurethane foam with ...

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Abstract

The invention relates to layered type gradient pore structure aluminum or aluminum alloy foam and a preparation method, and belongs to the field of porous metal materials. The preparation method comprises the steps that polyurethane foam is placed into water soluble type polyurethane emulsion for soaking to obtain the polyurethane foam with different apertures, matching is carried out according toa mode that the apertures are sequentially stacked from large to small, then the polyurethane foam is placed into a pouring mould and gypsum sizing agents are permeated into the polyurethane foam toobtain a gypsum / polyurethane foam mixture, and the gypsum / polyurethane foam mixture is dried and roasted to obtain a precursor; and the precursor is subjected to preheating, percolation and gypsum dissolved in water to obtain the layered type gradient pore structure aluminum or aluminum alloy foam. According to the layered type gradient pore structure aluminum or aluminum alloy foam and the preparation method, the problems that percolation precursor preparation and pore structure control difficulty exist in the layered type gradient pore structure aluminum or aluminum alloy foam prepared by apercolation casting method and excessive porosity of commercial polyurethane foam are solved, a layered type gradient pore structure of obtained aluminum or aluminum alloy foam is controllable, diversified layered type gradient pore structure matching can be realized, the preparation process is simple, and industrial production can be realized.

Description

technical field [0001] The invention relates to an aluminum or aluminum alloy foam with a layered gradient pore structure and a preparation method thereof, belonging to the field of porous metal materials. Background technique [0002] Aluminum or aluminum alloy foam is a structure-function integrated porous metal material, which has the characteristics of light weight, high specific strength, damping, sound absorption and vibration reduction, fire resistance and flame retardancy, and energy absorption. Aluminum foam with through-hole structure has broad application prospects in the field of sound absorption and noise reduction in audio frequency rooms, engine (electric) machine rooms, urban viaducts, high-speed rail, airports and other environments. [0003] At present, infiltration casting is the main method to prepare sound-absorbing aluminum or aluminum alloy foam with through-hole structure, but the conventional infiltration method can only obtain aluminum or aluminum a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
CPCC22C1/08C22C1/082
Inventor 左孝青张磊周芸罗晓旭陈显宁
Owner KUNMING UNIV OF SCI & TECH
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