Abstract
A cylindric porous ceramic was prepared by the centrifugal molding and mixing of an organic pore-former. After sintering, the porosity of cylinder was graded radially. The inner part of hollow cylinder had higher porosity than the other part, and open pores with 10 - 20 micrometer in diameter were observed throughout the thickness. This porous microstructure contributes to a desirable catalysis support or filter with higher gas/liquid permeability. On the other hand, the outer part had lower porosity and maintains the fracture strength of hollow cylinder. The pore size, distribution or morphology in porous alumina were controlled by a kind and amount of organic material or the centrifugal conditions. [Materials: alumina and TZP.[