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In the field of noise reduction, the "working environment" for sound barriers is often challenging: salt spray from the sea can corrode metal, severe cold in the north can crack panels, acidic and alkaline gases in industrial areas can erode surfaces, and strong winds are the ultimate test of structural stability. Yet, aluminum foam sound barriers can maintain their highly effective noise reduction capabilities in these "harsh battlefields." What is their secret to being so "tough"?

As the world shifts towards a future powered by electricity, the demand for more efficient, lighter, and longer-lasting batteries is greater than ever. Traditional battery designs often rely on thin, flat foils as current collectors, but a new class of materials is emerging as a game-changer: foamed copper and foamed nickel rolls. These advanced materials, with their unique porous structures, are unlocking new possibilities for high-performance battery systems.

Aluminum foam is a highly recyclable material. Some researchers have studied the recycling of waste aluminum foam by remelting it using a flux-covered method. They found that the initial recovery rate of waste aluminum foam reached approximately 75%, and after treating the slag, the total recovery rate could exceed 92%. The recycled aluminum foam has similar properties to the original material.

Translucent aluminum foam is a special aluminum foam material that allows light to pass through through a unique porous structure and is commonly used in architecture, interior design, and decoration. It combines the advantages of aluminum foam such as lightweight, high strength, sound absorption, and fire resistance with a unique visual effect, making it a new type of material that is highly creative and practical.

The noise attenuation effect of aluminum foam is determined by its unique structural features. Aluminum foam has a high porosity and a high interconnected pore rate, which allows sound waves to enter and be absorbed easily, meeting the structural requirements of typical sound-absorbing materials. Additionally, the foam's metallic properties, such as high thermal conductivity and high vibration frequency, also contribute to sound wave absorption. The mechanism of its sound attenuation can be explained in two ways.

Sound-absorbing alumimum foam panel is a new type of functional material with significant sound-absorbing and sound-insulating properties. It has been widely used in modern construction, transportation, aviation and other fields.The following will introduce in detail the characteristics, performance, production technology, application scenarios and future development trends of sound-absorbing and sound-proof foamed aluminum.

Foam ceramics are primarily classified in three ways: by the connectivity of the pores, the size of the pores, and the chemical composition of the material.

Nickel foam exhibits excellent high-temperature resistance. In air, it remains stable at temperatures below 300°C without significant oxidation or structural changes. When temperatures rise to 400–600°C, an oxide layer gradually forms on the surface, but the internal structure remains intact. At temperatures exceeding 600°C, oxidation accelerates, and the nickel layer may become brittle due to oxidation, affecting mechanical properties. Under inert gas protection, its high-temperature resistance is even better, capable of withstanding temperatures above 800°C without significant degradation.

Metal foam, this unique new multifunctional material, resembles delicate “foam” or regular “honeycomb” in form. It is based on polyurethane (PU) soft foam and undergoes precise pretreatment, chemical deposition, electroplating, and heat treatment processes to achieve its distinctive physical and chemical properties. In the battery sector, foam copper is emerging as a leading candidate for next-generation battery core materials due to its excellent conductivity and high specific surface area.

Foam ceramic filters can effectively intercept inclusions in liquid metal, purifying the molten metal. The main mechanisms for metal filtration and purification include: sieving-filter cake-deep bed filtration mechanism; floating filtration mechanism; adsorption mechanism; and rectification mechanism.