The development of modern technology has made the preparation technology of foam metal increasingly perfect, and the manufacturing cost has been continuously reduced. Foamed metal represented by foamed aluminum is a new type of functional structural material that has developed rapidly in recent years. As a structural material, it has the characteristics of light weight and high specific strength. As a functional material, foamed aluminum has the advantages of shock absorption, impact absorption, high temperature resistance, sound insulation, and sound absorption.
The internal pores of the closed-cell aluminum foam are filled with gas with a small heat transfer capacity, which makes the heat transfer capacity much smaller than that of solid materials. Through-hole aluminum foam has a large specific surface area, high porosity, wide heat diffusion space and high pore wall heat transfer, giving it good heat exchange performance. Under the condition of natural convection, heat exchange can be performed between the flow of gas or liquid in the pores of metal foams such as through-hole aluminum foam and the pore walls. Therefore, through-hole aluminum foam is a good heat exchange material or heat dissipation material.
Foamed aluminum will convert a large amount of work into energy in the form of deformation, collapse, rupture and mutual friction of the foamed aluminum cells during the compression process. Therefore, the foamed aluminum can absorb a large amount of external impact energy. Foamed aluminum has very high damping properties, and the damping value of pure aluminum foam is about 5-10 times that of aluminum. Utilizing the good energy absorption and damping properties of foamed aluminum, it can be made into excellent energy absorbing materials and shock-absorbing materials, such as car bumpers, spacecraft landing gears, elevators, conveyor safety pads, and high-speed grinder protective covers. Can be lined, etc.
Due to its good fluid transmission power, the heat dissipation performance of the through-hole foam metal can even reach the thermal conductivity of its dense matrix. The use of this foam metal can enhance the heat exchangers of aviation equipment, compact heat sinks for energy and power, and air cooling. The heat exchange capacity of condensing towers and other equipment. For example, in the deicing device and anti-freezing device used on the airplane, the through-hole foam aluminum plate is installed in front of the wing, and the heated gas or antifreeze is sprayed from the foam aluminum plate to achieve the purpose of deicing.