Guide the development of modern process technology, making the preparation technology of foam metal increasingly perfect, and the manufacturing cost is 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, aluminum foam has the advantages of shock absorption, shock absorption, high temperature resistance, sound insulation and sound absorption.
The internal pores of closed-cell aluminum foam are filled with gas with little heat transfer capacity, making its heat transfer capacity much smaller than that of solid materials. Through-cell aluminum foam has 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 foam metal such as through-hole aluminum foam and its pore walls, so through-hole aluminum foam is a good heat exchange material or heat dissipation material.
During the compression process of aluminum foam, a large amount of work will be converted into energy in the form of deformation, collapse, rupture and mutual friction of aluminum foam cells, so aluminum foam can absorb a large amount of external impact energy. Aluminum foam has high damping characteristics, and the damping value of pure aluminum foam is about 5 to 10 times that of aluminum. Using the good energy absorption and damping properties of aluminum foam, it can be made into excellent energy absorption materials and shock absorption materials, such as automobile bumpers, spaceship landing gear, 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 through-hole metal foam can even reach the thermal conductivity of its dense matrix. The use of this foam metal can enhance heat exchangers for aerospace equipment, compact heat sinks for energy power and air cooling. The heat exchange capacity of equipment such as condensing towers. For example, in the de-icing device and anti-freezing device used in the aircraft, 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 de-icing.
