In-Situ Oxide Stabilization Development of Aluminum Foams in Powder Metallurgical Route : High Temperature Materials and Processes

摘要

The development of stabilizing oxides during foaming process has been studied. The investigation of microstructure shows that the surface oxide films on the aluminum powder particles were ruptured after compaction. Pore nucleation results in a comprehensive shearing of oxides. After complete melting of powder particles at which a continuous liquid is dominant, the oxides move through the cell walls and Plateau borders by convection, due to pore growth, and connected to each other due to their tangled shape, forming strong local clusters or networks, leading to foam stability.