METHOD FOR MAKING POROUS PRODUCTS WITH PREDETERMINED POROSITY DEGREE AND CONFIGURATION

摘要

powder metallurgy. SUBSTANCE: method comprises steps of pressing and sintering porous powder blanks of pellets; using initial powder in the form of pellets with size satisfying to relation dmax/dmin = 2.5 or less than such value; sintering pellets by hot isostatic pressing in capsules at temperature Tpr=(0.75...0.85)Tmlt and at pressure P=(0.15...0.5)deltaT, in order to provide density in range (0.75...0.9) of density of compacted material of pellets; then providing necessary configuration of porous product by mechanical working and by removing surface layer with thickness (0.5...2)dmax in flow-through portion of product by electrochemical treatment; dmax, dmin-diameter of pellets of maximum and minimum size respectively; Tmlt - melting point of pellet material; deltaT - yielding strength of pellet material at pressing temperature Tpr. EFFECT: enhanced quality of products, enlarged manufacturing possibilities of process for making porous products.