The foamed aluminum sound barrier is a collection of bubbles and aluminum diaphragms. The irregularity and three-dimensionality of the bubbles make it have many excellent characteristics. What are the characteristics of foam aluminum sound barriers? The density meter of foam aluminum sound barrier is about 1/5~1/10 of pure aluminum, 1/20 of iron, and 1/4 of wood and plastic.
The sound absorption characteristics of the foam aluminum sound barrier are: the sound enters the foam aluminum and is diffusely reflected and interferes with each other, so that the sound energy is converted into heat energy, thereby reducing the noise. Compared with other sound-absorbing materials, foamed aluminum has excellent low-frequency absorption performance. The foamed aluminum plus a cavity of a certain size has a better sound absorption effect and can be used in a wider frequency range.
The aluminum foam sound barrier has good sound insulation effect in the sound frequency range and is sensitive to frequency. The comprehensive noise reduction rate is 40%. The sound insulation effect varies with the difference of the foam aluminum pore structure; the pore size is 1.0MM, and the porosity is 60% aluminum foam has a better sound insulation effect, and can reduce noise by 16%-23% on the basis of solid aluminum sound insulation. Foamed aluminum can be compounded with other sound insulation materials. Due to the sound absorption of foamed aluminum, the sound insulation effect can be further improved. Traffic noise is mainly low and medium frequency, so foamed aluminum has been widely used in environmental protection projects for sound insulation and noise reduction of traffic noise.
The foamed aluminum sound-absorbing panel has good fire resistance. The melting point of aluminum is 660 ℃, and the foamed aluminum does not start to soften until it reaches 800 ℃ (because it cannot bear its own weight), but it has not melted. Foamed aluminum will not deform even if exposed to a high temperature of 780 ℃ without external force, which shows that foamed aluminum can withstand higher temperatures than ordinary sound-absorbing materials.