Fabrication of solid state foams based on full stabilized zirconia ceramics facilitating the superplasticity with dispersoids

Model ceramic foams were fabricated by expanding once-sintered dense shells utilizing the superplastic deformation of 8 mol% yttria-stabilized zirconia (8YSZ) dispersed with silica, titania or alumina. Similar to the case without dispersoid, 8YSZ based ceramic foam could not be fabricated with any amount of alumina addition. By adding silica more than 20 mol%, ceramic mono-foam can successfully be fabricated. The porosity increased with the sintering time up to 24 h, then saturated at about 40%. The porosity also increased with the amount of silica addition. In the case of titania addition, porosity was smaller compared with the same amount of silica addition.