Aluminum Foam Application and Innovation

[China Aluminum] An expert of the Russian Institute of Light Alloys has developed a foam aluminum alloy material that is comparable in strength to beech wood and foamed concrete, and its light weight can be compared with wood panels. The foamed aluminum alloy material is obtained by mixing an oxidized aluminum alloy powder with a substance that is separated during heating and gasification. Due to different alloys contained in aluminum, different heating procedures, and different gasification powders obtained when new materials are synthesized, the later obtained foamed aluminum alloys have different densities, and the pores of the foams are also very small. Foam aluminum alloy material has a certain sound insulation and thermal insulation, non-toxic and will not burn. The material can be sawed and milled, and can be screwed onto it. This new material, which is light, strong and not afraid of fire, can be used for the veneering of elevator doors, the laying of trains and the ground of subway cars.

Foam aluminum is made of pure aluminum or aluminum alloy and added with additives. After foaming process, it has both metal and bubble characteristics. It has small density, high absorption shock resistance, high temperature resistance, strong fire resistance, corrosion resistance, noise reduction, low thermal conductivity, high electromagnetic shielding, strong weather resistance, filtration capacity, easy processing, easy installation, high forming accuracy , can be surface coating.

Aluminum foam has excellent physical properties, chemical and mechanical properties and recyclability. These excellent properties of foamed aluminum make it a broad application prospect in today's materials field, and it is a very promising engineering material, especially in the transportation industry, aerospace industry and building structure industry.

Lightweight: 0.1-0.4 times the density of metallic aluminum;

High specific stiffness: its flexural rigidity is 1.5 times that of steel;

High damping performance and impact energy absorption rate: The damping performance is 5-10 times that of metallic aluminum. When foamed aluminum with a porosity of 84% undergoes 50% modification, it can absorb energy of 2.5 MJ/M3C or more.

Good acoustics function:

1, sound insulation performance (closed hole): sound wave frequency between 800-4000HZ, closed-cell foam aluminum sound insulation coefficient of 0.9 or more.

2. Sound absorption performance (micro through hole and through hole): When sound wave frequency is between 125---4000HZ, the sound absorption coefficient of through-hole aluminum foam can reach 0.8, and the average absorption coefficient of octave exceeds 0.4. .

Excellent electromagnetic shielding performance: When the electromagnetic wave frequency is between 2.6-18 GHz, the electromagnetic shielding of aluminum foam can reach 60-90dB.

Good thermal properties: The porosity of the closed-cell aluminum foam with a porosity of 80-90% is 0.3-1 W/m#8226;k, which is equivalent to marble. Through-hole aluminum foam has good heat dissipation under forced convection conditions because its pores communicate with each other.

Does not burn and has better heat resistance. â–¡ Corrosion resistance, good weather resistance, low moisture absorption, no aging, no toxicity.

Easy to process: easy to cut, drill, cement; can be bent into the desired shape after molding; can be surface treatment with organic or inorganic paint; can be two sides of the skin, constitute a large size of light, high stiffness plate.

Easy to install: Foam aluminum material can be installed at a height without mechanical lifting equipment, such as ceilings, walls, roofs, etc., can be mechanically attached or fixed directly with screws, or glued to the wall with adhesives. Or on the ceiling.

Metal sheet - foamed aluminum - "sandwich" structure formed by metal sheet inherits the excellent performance of foamed aluminum and has high flexural strength, and can be used as a high-rigidity structural part for new type building materials and rolling stock.

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