Expressway And High-Speed Rail Foam Aluminum sheet Sound Barrier

Foam aluminum sound barrier

The application of sound barrier foam aluminum board is becoming more and more extensive. Because of its absorption performance and sound insulation performance, material suppliers have now turned their attention to the emerging sound barrier enterprises in China. This industry, which is increasingly valued, has huge market potential as the economy and living standards improve!

1. Lightweight characteristics of foam aluminum:

Aperture: evenly distributed 1-10mm, main aperture 4-8mm;

Porosity: 75%~90%;

Density: 0.25 g/cm3~0.70g/cm³;

2. Performance of foam aluminum sound-absorbing board:

Sound absorption performance: Punching closed-cell foam aluminum board can be made into high-sound absorption sound-absorbing board. When the opening rate is 1%~3%, the sound absorption rate is the highest. The sound absorption rate measured by the standing wave method reaches 40%~80% in the range of 1000Hz to 2000Hz.

3. Sound insulation performance of foam aluminum:

Sound absorption performance: Punching closed-cell foam aluminum board can be made into high-sound absorption sound-absorbing board. When the opening rate is 1%~3%, the sound absorption rate is the highest. The sound absorption rate measured by the standing wave method reaches 40%~80% in the range of 1000Hz to 2000Hz.

4. Weather resistance:

Corrosion resistance: No obvious abnormality after one year of exposure to the marine atmosphere; no abnormality in the water spray salt spray test for 2 years under accelerated corrosion conditions; indicating that the corrosion resistance of foam aluminum is very good.

No moisture absorption: The moisture absorption rate of foam aluminum is 0.0%. There is no moisture absorption phenomenon, and the acoustic performance will not be reduced due to moisture.

Heat-resistant/non-flammable properties: Foam aluminum softens only at a high temperature of 600℃ and is a non-flammable material.

Thermal insulation performance: The thermal conductivity of foam aluminum is 0.25~0.62W/m.K, which is equivalent to marble and has good thermal insulation performance.

Thermal stability: The linear expansion coefficient of foam aluminum is 1.934*10℃, which is equivalent to concrete and is not easily deformed by heat.

5. Mechanical properties:

Mechanical properties: compressive strength: 3~17MPa; flexural strength: 3~15MPa; tensile strength: 2~7MPa;

Buffering performance: energy absorption can reach 8J/cm³~30J/cm³. Foamed aluminum can absorb energy through deformation and is an excellent impact energy absorbing material.

Damping performance: According to the test of the Institute of Solid State Physics of the Chinese Academy of Sciences, the internal friction factor Q-1 of foamed aluminum reaches 6×10-3.

6. Foamed aluminum machining performance:

Foamed aluminum is widely used in various fields. It is a porous, light, silver-white metal material with excellent processing characteristics. It can be sawed, cut, planed, milled, etc. It is easy to process into plates, strips, bars and various special-shaped parts.

7. Green and environmentally friendly

Non-toxic: Foamed aluminum is a composite material composed of metal and pores. It is non-toxic in itself and will not emit toxic gases at high temperatures.

The results of the gas release experiment conducted at the China Shipbuilding Industry Chemical Substance Testing Center showed that the foamed aluminum and the corresponding adhesive developed by the 725 Institute did not detect any harmful substances.

Recyclable: The main chemical components of foamed aluminum are aluminum alloy and its oxides, which can be 100% recycled and will not cause any pollution to the environment.

Electromagnetic shielding: Electromagnetic shielding (below 200MHz) shields the electromagnetic screen 90dB and has excellent electromagnetic shielding performance.