1992 Volume 18 Issue 5 Pages 752-756
Porous alumina and magnesia particles were prepared by freeze-dry processing. Freeze dried particles from an aqueous metal salt solution have many pores formed by ice sublimation traces. The particles were calcined to form oxide particles, which still had a porous configuration. When the porous calcined particles were committed to a furnace they became porous ceramic particles. Various factors such as feed concentration of a metal solution, freezing temperature, firing temperature and hold time were investigated to determine how they affect the pore configuration of the particles. The relationships between compressive strength and porosity and between specific surface area and porosity were clarified.
