Foamed aluminum, generally speaking, is the foaming of aluminum metal materials to form a microscopic metal pore structure with a large number of bubbles. Its unique charm is that the material can be designed and realized by changing the density and pore structure of the material itself in different product application fields and corresponding different performance requirements.
The formation of open-cell and closed-cell structures is related to the type of foaming agent, and is also affected by the amount of foaming agent and the foaming process. The cell structure is not only related to the Mooney viscosity of the rubber compound and the vulcanization process conditions, but also closely related to the type and dosage of the foaming agent as well as its dispersion and solubility in the rubber compound.
Open cell aluminum foam: The internal cells communicate with the cells, which is a non-independent cell structure.
The cells of the open-cell foam material are connected to each other, or completely connected, one-dimensional or three-dimensional can pass gas or liquid, the pore size is 0.5-1.0mm, the porosity is 70-90%, and the through porosity is 55- 65%. Due to its special structure, the open-cell foam material has the following characteristics:
1. Superior compressibility: It can be compressed as long as the stress is low, the rebound force is small, and it is easy to recover.
2. Thermal insulation: Although it has an open-cell structure, the cells are complex and have the same thermal insulation effect as a closed-cell material.
3. Water stop and water retention: After compression, the water will not leak, and the internal water will not be easily lost.
4. Sound absorption: Due to the high opening rate and the complex internal cell structure, the sound wave energy is attenuated, thus exhibiting excellent sound absorption performance.
Closed cell aluminum foam: the internal cells are separated from the cells by a wall membrane, which is not connected to each other, and is an independent cell structure.
Closed-cell foam material: It has an independent cell structure, and the internal cells are separated from the cells by a wall film, and they are not connected to each other. The closed-cell foam material has extremely excellent impact resistance, resilience, flexibility, sound insulation, heat insulation, water resistance, vapor resistance, floating properties, etc.