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Research at OU


Annual Report of Osaka University
Fabrication of Porous Iron by Unidirectional Solidification in Nitrogen Atmosphere

Lotus-structured porous metals were fabricated by unidirectional solidification method at a pressurized hydrogen gas. However, since the hydrogen gas is inflammable and explosive, its use is not convenient from the industrial point of view. In the present work, we have successfully fabricated the lotus-structured porous iron having long aligned pores in the nitrogen atmosphere for the first time. The porosity is controlled by adjusting the partial pressures of nitrogen and argon during melting and solidification. The nitrogen is contained in the solid iron whose concentration is as much as 0.1 mass%. The concentration increases with increasing partial pressure of nitrogen at a given total pressure, leading to improve the mechanical properties of the porous iron.


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