| abstract |
A porous material and a preparation method, the material comprising a material body, the body being formed of hole cavities (1) graded by material hole diameter size and cavity walls (2) formed around the hole cavities (1), lower grade hole cavities (3) being arranged on the cavity walls (2) formed around higher grade hole cavities (1) in a three-dimensional space, the hole cavities (1) of the various grades being respectively connected to each other, the hole cavities (1) of the various grades also being mutually inter-connected. The preparation method comprises: mixing a raw material powder and a pore-forming agent used for preparing the smallest grade hole cavities (3) of the porous material to prepare a slurry, uniformly filling the slurry into a polymer material support, forming a blank, drying and crushing to obtain mixed granules, uniformly mixing the mixed granules with a pore-forming agent used for preparing the higher grade hole cavities (1) which are larger than the smallest grade hole cavities (3) of the porous material, preparing a dense blank, vacuum sintering, and performing conventional follow-up treatment according to the raw material process of the porous material. |