Cellular porous ceramics, produced by the replica technique are state of the art for the filtration of aluminum, iron and steel melts. The replica method, invented by Schwarzwalder, is a technique to produce cellular ceramic foams with a high porosity (up to 90%) and macro pore sizes between 10 and 70 pores per inch. Polymeric foams are coated with ceramic slurry and after drying and sintering highly porous ceramic foams with different kind of pores are formed. There are inter connected macro pores, triangular cavities (formed by the burn out of the polymeric foam) and material pores.
Mercury intrusion porosimetry (MIP) is an analytical technique used to characterize the material's porous nature according to the pore diameter, total pore volume and bulk density. The technique involves the intrusion of non-wetting mercury into the sample as a function of pressure.
The variety of pore types in cellular ceramic foams with different size, form and accessibility causes difficulties by using MIP for the characterization of the ceramic foams.
This study attempts to include the influence of parameter as sample weight, sample size and equilibrium settings for the measurement of cellular ceramics