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pp.191-195
This study reports a simple way of fabricating the porous Cu with unidirectional pore channels by freezedrying camphene slurry with Cu oxide coated Cu powders. The coated powders were prepared by calcination of ball-milled powder mixture of Cu and Cu-nitrate. Improved dispersion stability of camphene slurry could be achieved usingthe Cu oxide coated Cu powders instead of pure Cu powders. Pores in the frozen specimen at -25oC were generated bysublimation of the camphene during drying in air, and the green bodies were sintered at 750oC for 1 h in H2 atmo-sphere. XRD analysis revealed that the coated layer of Cu oxide was completely converted to Cu phase without anyreaction phases by hydrogen heat treatment. The porous Cu specimen prepared from pure Cu powders showed partlylarge pores with unidirectional pore channels, but most of pores were randomly distributed. In contrast, large andaligned parallel pores to the camphene growth direction were clearly observed in the sample using Cu oxide coated Cupowders. Pore formation behavior depending on the initial powders was discussed based on the degree of powder rear-rangement and dispersion stability in slurry.
