[China Aluminum Industry Network] Foam aluminum is a unique material composed of numerous bubbles and aluminum membranes, with its irregular and three-dimensional structure contributing to a wide range of remarkable properties.
1. Lightweight: The density of foam aluminum is roughly between 1/5 to 1/10 that of pure aluminum, 1/20 that of iron, and only 1/4 of wood or plastic. This makes it an ideal choice for applications where weight reduction is essential without compromising structural integrity.
2. Sound Absorption: When sound waves enter foam aluminum, they undergo diffusion and reflection, which interfere with each other and convert sound energy into heat, effectively reducing noise. Compared to traditional sound-absorbing materials, foam aluminum excels in low-frequency absorption. Adding a cavity of appropriate size enhances the sound absorption performance, allowing it to function across a broader frequency range. For instance, when a 10 mm thick layer of foam aluminum is applied to a cement wall, noise levels can be reduced by up to 17 dB.
3. Acoustic Properties: Foam aluminum can be combined with other sound insulation materials to further enhance the overall acoustic performance. Its natural sound absorption qualities make it a versatile component in noise control systems.
4. Fire Resistance: Foam aluminum exhibits excellent fire resistance. While aluminum melts at 660°C, foam aluminum begins to soften at around 800°C (though it hasn't fully melted yet). It remains structurally stable even under high temperatures of 780°C, making it more heat-resistant than many conventional sound-absorbing materials. Additionally, it is non-combustible and does not emit harmful gases like plastics do during combustion.
5. Electromagnetic Shielding: In addition to its sound absorption capabilities, foam aluminum offers excellent electromagnetic shielding. This makes it particularly suitable for use in electrical equipment rooms, where it can serve as both a sound-absorbing and electromagnetic shielding material.
6. Impact Buffering: When compressed, foam aluminum deforms gradually as the bubble membranes stretch and break, absorbing impact energy and providing effective shock absorption. This property makes it ideal for applications requiring energy dissipation.
7. Low Thermal Conductivity: The thermal conductivity of foam aluminum is significantly lower than that of pure aluminum, ranging from 1/60 to 1/500 times. Its coefficient of linear expansion is similar to that of pure aluminum, making it thermally stable and suitable for various environments.
8. Easy to Process: Foam aluminum is highly machinable. It can be cut, drilled, bent, and embossed easily using standard tools. It can also be bonded together with adhesives or fastened with rivets, making it adaptable for different design requirements.
9. Easy Installation: Due to its lightweight nature, foam aluminum can be installed manually, especially in hard-to-reach areas such as ceilings, walls, and roofs. Its ease of processing allows for seamless integration with other structures, simplifying on-site construction and installation.
10. Surface Decorability: With special surface treatment processes, foam aluminum can be fully painted without affecting its sound absorption performance. This makes it a visually appealing option for interior applications.
11. Sandwich Panel Applications: Foam aluminum can be used as a core material between thin plates of aluminum, copper, titanium, and other metals to create strong, lightweight sandwich panels. These panels are ideal for structural applications where strength and lightness are both required.
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