Porous aluminium

A new technology of producing an unsinkable aluminium alloy was developed at Peter the Great St. Petersburg Polytechnic University (SPbPU). Porosity is produced by the addition of foaming gas into liquid aluminum during re-melting. The porous materials can increase stiffness and sound and heat insulating proprieties, according to the SPbPU's Media-center. "A high porosity level can be used to decrease the density of structural elements, e.g. sheets. The density can be decreased even lower than the density of water. Resulting structural elements would be unsinkable. And its usage in shipbuilding will ensure unsinkability even with a leak in the hull,"…