New Manufacturing Technology of Iron Based Metallic Foam

During the last decade, various technologies such as slurry gelating, spacer, sintering, casting and foaming have been developed in the manufacturing iron-based porous and foamed materials. For example, SUS316L foam with porosity of 98% has been manufactured successfully by slurry gelation technology, and manufacture of lotus-type porous stainless steel having unidirectionally aligned pores by casting technology has been reported. On the other hand, foaming technology shows a potential to manufacture iron-based foamed materials with higher strength and a lower cost. In this study, new manufacturing technology of formed iron was investigated by using the formation of CO and CO_2 gas during the reduction of iron oxide. It has been manufactured by using a compact prepared from the blended powders of electrolytic iron, graphite and hematite. The porosity of the product was approximately 50%, which was obtained by heating the compact with Fe-3.1mass%C-1.0mass%Fe_2O_3 at 1553K.報文Original Pape