Porous ceramics were fabricated by firing ceramic-polymer composites prepared by casting dispersions containing cellulose acetate, water and colloidal ceramic particles (alumina and silica). Composite microstructures were determined by polymer phase separation. Polymer adsorption on the ceramic partidles was necessary for the formation of controlled porosity in the composite and fired ceramic. Cellulose acetate adsorbed on alumina, but no silica particles. The microstructure of alumina-cellulose acetate composites was characterized by unagglomerated alumina particles in a polymer matrix. By constrast, silica-cellulose acetate composites contained agglomerated silica particles and a large pore structure invariant to silica content.
|Original language||English (US)|
|Number of pages||11|
|Issue number||11 11A|
|State||Published - Dec 1 1997|