Fabrication of hollow cylindrical functionally graded porous material by centrifugal casting

Abstract

Graded porous ceramics was fabricated by centrifugal casting using alumina-PMMA slurry. The slurry was prepared dispersing the powders ultrasonically in deionized water with dispersant agent. The concentration of the dispersant affected the pore distribution. The sphere pores with about 10 μm diameter, which corresponded to PMMA particle size, were observed and increasing toward the inner surface gradually. Air permeability increased in proportion to the porosity and fracture strength was decreased with increasing porosity.