Abstract
Lotus-type porous Cu,Mg and Ni were fabricated by a mould casting technique in hydrogen gas atmosphere.The effect of solidification rate on the structure of the lotus type porous metals was comparatively investigated by theoretical calculation and experiments.The results show that the increase of bubble radius results in an increase of bubble rising velocity for Cu,Mg and Ni.A suitable ordered porous structure can be obtained only when the maximum solidification rate is in the range of bubble rising velocity.
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