[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.
â–¡ Lightweight: 0.1-0.4 times the density of metallic aluminum;
â–¡ high specific stiffness: its bending rigidity is 1.5 times that of steel;
â–¡ 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.
â–¡ Good acoustic 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. .
â–¡ Excellent electromagnetic shielding performance: When the electromagnetic wave frequency is between 2.6-18 GHz, the electromagnetic shielding capacity of aluminum foam can reach 60-90dB.
â–¡Good thermal performance: 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.
â–¡ Does not burn and has better heat resistance. â–¡ Corrosion resistance, good weather resistance, low moisture absorption, no aging, no toxicity.
â–¡ Easily processed: easy to cut, drill, and cement; can be bent into a desired shape after being molded; can be surface treated with organic or inorganic paint; can be skinned on both sides to form a large-sized lightweight, high-stiffness plate.
â–¡Easy to install: The aluminum foam material can be installed at a height without mechanical lifting equipment, such as ceilings, walls and roofs. It can be mechanically connected or fixed directly with screws, or it can be adhesively bonded. Wall or ceiling.
â–¡Metal sheet - foamed aluminum - The "sandwich" structure formed by the metal sheet inherits the excellent performance of the foamed aluminum and has a high flexural strength. It can be used as a high-rigidity structural part for new types of building materials and rolling stock.
â–¡Multifunctional compatibility of the above features.
â–¡ Larger aperture 0.3 - 7mm;
â–¡ Higher and controllable porosity: 63% - 90%;
â–¡ Larger surface area 10---45cm2/cm3;
â–¡ Diversified pore structure; closed-cell, through-hole and micro-via aluminum foam;
â–¡ The metal skeleton composition and pore structure are controllable and can adapt to different needs.
Sound absorption, sound insulation materials: Foam aluminum can be used for noise control of urban light rails, elevated highways, underground tunnels, mechanical equipment, and improvement of acoustical rooms in acoustic rooms, multi-purpose halls and other indoor rooms. Sound-absorbing aluminum foam is glued onto concrete or steel structures and placed on both sides of viaducts and light rails as large-scale sound-absorbing walls, which can reduce urban traffic noise. The sound-insulated foamed aluminum can be used for noise isolation in the factory's machine room, machinery and equipment, and outdoor construction sites, and solves many limitations of the currently widely used sound-absorbing materials such as glass wool and asbestos.
Foam aluminum "sandwich" structure, with light weight, high rigidity characteristics, can be used as excellent structural material. For example, when used as a structural part of a car, the weight is only half that of a steel structure, and the rigidity is increased by a factor of 10. It is reported that about 20% of automobile structural parts can use this structure.
New building materials:
Foam aluminum is a new type of building and decoration material. It has the advantages of light weight, high specific stiffness, beautiful appearance, non-burning, etc., and it also has the characteristics of sound absorption, heat insulation and electromagnetic shielding. Therefore, aluminum foam can be widely used in shopping malls, hotels, gymnasiums and other venues of architectural decoration.
Electromagnetic shielding materials: Due to its excellent electromagnetic shielding properties, aluminum foam can be used for electromagnetic shielding in telecommunications, electronic equipment, computer rooms, and television broadcasting equipment, and can prevent the electromagnetic pulse effect caused by nuclear radiation. (This effect can burn semiconductors or generate Loss of data transmission has caused electronic confusion and eventually destroyed electronic equipment.)
Insulation material: Because of its low thermal conductivity, it has the advantages of light weight, high specific stiffness, non-combustibility, etc., and can be used as heat insulation, insulation, cold insulation materials, etc.
Impact Energy Absorbing Material: As it has excellent impact energy absorption properties, it can be used as a protective cover for automobile anti-impact gears and mechanical devices, as well as safety mats for lifts, aircraft shell sandwiches (rescue blasting shock waves), and protective layers for spacecrafts ( Can capture space debris) etc. Cooperation methods: Technology shares.

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