METHOD FOR MAKING POROUS MATERIAL AND MATERIAL MADE BY SUCH METHOD Russian patent published in 2001 - IPC

FIELD: powder metallurgy, possibly manufacture of filtering members for cleaning gases and liquids. SUBSTANCE: method comprises steps of preparing exothermic mixture of powders of initial components taken in relation providing self-burning of mixture; pressing prepared mixture to blanks of predetermined shape; subjecting blanks to vacuum heat treatment until beginning their self-ignition; providing self-distribution of high temperature synthesis and then cooling material in vacuum. Exothermic mixture is prepared by layers, at least by two layers having the same or different thickness and component content. Fineness of powders of initial components of each layer is different; it increases from first layer to next one. At least one layer includes monodispersion or different-dispersion powders of initial components. Porous material features gradient distribution of pores and open porosity degrees in range 68-95%. EFFECT: enhanced quality of porous material. 7 cl, 4 tbl