Various Fabrication Methods of Cellular Metals and Foamed Metals

This book concerns about porous metals with directional pores. In general, porous materials are defined as holey materials, which are mainly characterized by porosity. The porous materials with high porosity and low density are called as foamed materials, which resemble bubbling materials such as soap and beer. Cellular materials look like honeycomb, whose porosity is also high and the density is low. The holey materials, whose porosity is less than 70 %, are usually called porous materials. Depending upon the shape of pores, isotropic and anisotropic porous materials are classified. The former has rather isotropic spherical pores, while the latter has cylindrically elongated pores aligned in one direction. In this chapter, various fabrication techniques of foamed metals and cellular metals are presented.