The Effect of Correlation Between Starting Reagent Size/Ratio and Structural Parameters on the Permeability of Porous Al2O3 Ceramics

Submicron-porous ceramic materials were prepared from mixtures consisting of coarse α-Al2O3 filler and ultrafine binders by combined use of SHS, compaction, and sintering. Variation in starting reagent size and filler/binders ratio made it possible to control the porosity, pore size, and permeability of synthesized materials. It was found that in materials with pore size between 0.4 to 1.3 µm, pore size has a dominating influence on their permeability rather than porosity.