Method for producing porous sponge like metal of which density of pores is controllable

摘要

A method for producing a sponge like metallic structure of which density of pores is controllable, organic blanks are selected according to the shapes and sizes of the pores to be shaped and are dipped with organic medium, the blanks are agglomerated in a step of accumulation and are baked for shaping, the blanks and the organic medium thus form a shaped embryo by adhering. The embryo is processed by dipping with refractory mortar in vacuum, and is dried to form a refractory layer, then is dealt with by sintering in high temperature to effect carbonizing and disappearance of the blanks and organic medium by burning, and forms shaped ceramic shells distributed with mutually communicating pores and communicating areas and with gaps around the pores and communicating areas. An equipment for vacuum founding is used to practice a preheating step on the shaped ceramic shells, and then pressing found the shaped ceramic shells which are cast with metallic melt to fill in the gaps and to envelop the communicating areas and pores, thus a metal article with porous sponge like structure having pores communicating with one another is formed.