Fabrication of porous copper by unidirectional solidification under hydrogen and its properties

Formation of Pores during Unidirectional Solidification of Water Containing Carbon Dioxide

“…[1][2][3][4][5][6][7] Hyun et al have shown that lotus-type porous copper has higher specific tensile strength when the tensile direction is parallel to the pore axis, compared with the conventional porous metals produced by, for example, foaming techniques or sintering methods. 1,2) Thus, lotus-type metals are promising both as structural materials and as functional materials. This new type of porous metal is fabricated by unidirectional solidification of molten metal dissolving hydrogen [1][2][3][4][5][6][7] or nitrogen.…”

“…1,2) Thus, lotus-type metals are promising both as structural materials and as functional materials. This new type of porous metal is fabricated by unidirectional solidification of molten metal dissolving hydrogen [1][2][3][4][5][6][7] or nitrogen. 8,9) During solidification, the gas is rejected at the advancing solidification front due to the solubility gap between the solid and the liquid and forms columnar pores growing in the solidification direction together with the solid phase.…”

Size Effects on Tensile Strength of Lotus-Type Porous Copper

“…Recently, lotus-type porous metals (lotus metals), possessing cylindrical pores aligned in one direction, attract much attention. [2][3][4][5] This is because the mechanical properties of lotus metals are superior to those of the conventional porous metals owing to their unique porous structure. Thus, lotus metals are promising not only as functional materials but also as structural materials.…”

Fabrication of Lotus-Type Porous Ni3Al with and without Boron

“…1) A lotus-type porous metal (lotus metal), possessing unidirectional pores aligned in one direction, is one of notable porous metals. [2][3][4][5] The aligned pores provides not only various functions but also high strength compared with other porous metals. Thus, several kinds of lotus metals have been fabricated so far.…”

“…Furthermore, Ni 3 Al with boron that improves the mechanical properties of Ni 3 Al was melted and unidirectionally solidified in pressurized hydrogen atmosphere, and the possibility of pore formation was also investigated.…”