Advantages and Properties of Aluminum Foam
The development of modern process technology has led to the increasing improvement of the preparation technology of foam Metal and the continuous reduction of the manufacturing cost. Foam metal represented byaluminum foamis a new type of functional structural Material that has been developed rapidly in recent years. As a structural material, it is characterized by light weight and high specific strength. As a functional material, aluminum foam has the advantages of shock absorption, shock absorbing ability, high temperature resistance, sound insulation and sound absorption.
The internal pores of closed-cell aluminum foam are filled with gases that have a small heat transfer capacity, making its heat transfer capacity much smaller than that of solid materials. The large specific surface area, high porosity, wide heat diffusion space and high heat transfer of the pore wall of through-cell foam aluminum give it good heat exchange performance. Under the condition of natural convection, heat exchange can be carried out through the flow of gas or liquid in the pores of foam metal such as through-hole aluminum foam and its pore wall, so through-hole aluminum foam is a very good heat exchange material or heat dissipation material.
Aluminum foam in the compression process will be converted into a large number of work in the form of aluminum foam cell deformation, collapse, rupture and mutual friction and other forms of energy loss, so the foam can absorb a large number of external impact energy. Aluminum foam has high damping characteristics, pure aluminum foam damping value 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 vibration damping materials, such as automobile bumpers, spacecraft landing gear, elevators, conveyor safety pads and high-speed grinder shield energy-absorbing liner.
Due to the good fluid transmission dynamics, the heat dissipation performance of the through-hole foam metal can even reach the thermal conductivity of its dense matrix, and the use of this foam metal can enhance the heat exchange capacity of heat exchangers for aerospace equipment, compact heat sinks for energy power, and condensation towers for air cooling. For example, for anti-icing and anti-freezing devices used on aircraft, through-hole aluminum foam panels are installed in front of the wings, and heated gas or antifreeze can be sprayed out of the aluminum foam panels to achieve the purpose of anti-icing.
