Foam aluminum anti-collision barrel

Aluminum foam is a new light metal material produced by aluminum alloy foaming. It has low density and high specific strength. It has many excellent properties such as light weight, energy absorption buffer, electromagnetic shielding, flame retardant and explosion-proof, sound absorption and sound insulation. It is widely used in aerospace, Military equipment, rail transportation, ship manufacturing, architectural decoration and other cutting-edge fields.

1. Analysis of the current situation of the domestic market

The domestic engineering application of foamed aluminum started in 2010, and was first applied in the plug door of CSR. The solution of foamed aluminum has been considered in the partition board, wall board and skirt board of the train in the follow-up. After 2014, foam aluminum batch to the market terminal. In the military industry, sound absorption and noise reduction and other fields, there has been a concentrated application. In the subsequent development process, with the continuous expansion of the application technology of foam aluminum materials, there will be a larger market breakthrough.
The research and industrial production of aluminum foam in China started late and basically started at the end of last century. As aluminum foam has gradually become a hot spot in the field of international materials, relevant domestic universities (such as Tsinghua University) and research units have successively carried out a series of research and development work, carried out systematic basic research and tests on the production process and production technology of aluminum foam, and achieved gratifying phased results.

2. Properties of aluminum foam

Foamed aluminum is also known as foamed aluminum. This material is obtained by foaming raw materials such as aluminum, aluminum alloy or aluminum matrix composite material, and there are a lot of bubbles inside it. Due to the pore structure formed by the bubble distribution in the continuous metal phase, aluminum foam combines the metal characteristics of the continuous phase aluminum with the characteristics of the pores of the dispersed phase, and shows the characteristics of integrating the structure and function characteristics. It is a brand-new strategic functional structural material with the advantages of low density, high impact absorption capacity, high temperature and weather resistance, filtration capacity, easy processing and installation, high forming precision, etc, surface coating can also be carried out. According to the different pore structure, aluminum foam materials can be divided into two types: open-cell and closed-cell.

Foamed aluminum has a variety of properties, the diversity of which comes from its large pore structure and metal matrix. In a broad sense, aluminum foam is a composite material of gas and solid, which has some common characteristics of foam materials and metal materials. Structurally, aluminum foam is a lightweight core filling material, which can improve the overall stiffness of the material; functionally, the larger pore structure has wave damping (acoustics, electromagnetic shielding, shock wave absorption, etc.) characteristics. These properties of aluminum foam provide support for its application areas. Therefore, aluminum foam has broad application prospects in transportation, construction, machinery, metallurgy and chemical industry, electronic information, aerospace and other fields.

Ultra-light, with a density of 0.2~0.4g/cm3, about 1/10 of the density of aluminum, 1/20 of the density of titanium, 1/30 of the density of steel and 1/3 of the density of wood.

Ø sound absorption, through the stomatal wall vibration to absorb the energy of the sound, used to eliminate noise, remove noise.

Ø Heat resistance, with high heat resistance, the melting temperature of general aluminum alloy is about 560-700 ℃, even if the aluminum foam is heated to 1400 ℃, it will not melt, and it will not release harmful gas at high temperature.

Electromagnetic wave shielding, aluminum foam has good shielding for high-frequency electromagnetic waves, which can reduce electromagnetic interference by more than 80%.

Ø The cutting performance of aluminum foam can be simply cut with a saw.

Ø Easy to install, aluminum foam materials can be installed in high places without the need for mechanical lifting equipment such as: ceiling, walls and roofs, etc., can be used mechanical methods or directly with screws to connect and fix, can also be used to paste on the wall or ceiling.

Ø Foam aluminum surface has excellent performance of preventing sound and light reflection. Since the air bubbles can be made independent or connected (I. e., closed-cell and open-cell structures), it can have excellent air-tightness, water-tightness or air-permeability.

Foamed aluminum can also be made into a sandwich structure. It is a high-strength and very light-weight plate. Aluminum, copper, titanium and other thin plates can be bonded on both sides of foamed aluminum to make a sandwich plate. Foam aluminum surface decoration effect is good. The coating has almost no damage to the sound absorption effect of foamed aluminum. By adopting a special process, the surface of foam aluminum can be coated with paint.

3. Characteristics of aluminum foam

Foamed aluminum has open holes, closed holes, large hole diameter, medium hole diameter, small hole diameter and natural casting surface, so the selection range is wider and the application is wider.

Morphology, characteristics and specifications of aluminum foam with different pore sizes

4. Prospects of main application fields

As a porous structure material, aluminum foam contains the noise reduction performance and cushioning performance (damping performance) of porous materials. Due to its porous structure characteristics, it has certain advantages in heat storage performance, fire resistance and apparent decoration performance. In addition, compared with the honeycomb structure lightweight material, it is an isotropic material. Compared with wood porous plastic, the metal matrix imparts fire protection characteristics to the foam metal. In general, it has good comprehensive performance, called structural and functional integration materials.

The unique structure and metal characteristics of foam aluminum make it have the characteristics of both structural materials and functional materials. As a structural material, it has the characteristics of light weight and high specific strength; as a functional material, it has sound absorption, sound insulation, heat insulation, heat dissipation, flame retardant, shock absorption, damping, impact energy absorption, electromagnetic shielding and filtering. Physical properties. Therefore, its application has been involved in aviation, aerospace, transportation, electronics, military industry, chemical industry, environmental protection, energy, machinery, thermal management, home building materials, biology and other high-tech fields and general industrial fields. With the discovery of more material properties, the gradual reduction of costs and the development needs of the market, foamed aluminum will be more and more widely used and more attention.