Preparation and Properties of Porous Alumina with Highly Ordered and Unidirectional Oriented Pores by a Self‐Organization Process

By a self‐organization process of alginate sol, alumina ceramic bodies with high porosity characterized by highly ordered and unidirectional oriented pores in the micrometer range were successfully fabricated with a 5–15 wt% solid loading range. The obtained porous Al 2 O 3 ceramics had a high total porosity over 70%, most (>88%) of which were open pores, as well as an excellent permeability (K > 2.16 × 10 −11 m 2 ) and high compressive strength (>15 MPa). The pore size, porosity, and thus the permeability and mechanical properties of the sintered ceramics can be effectively controlled by choosing different initial solid loadings.