Alumina-based monofoams utilizing superplastic deformation facilitated by the addition of magnesia or magnesium aluminate spinel

Alumina-based ceramic foam utilizing the superplastic deformation after sintering has been proposed and demonstrated by the present authors. Effects of two kinds of additives, magnesia or magnesium aluminate spinel on the figure of alumina-based ceramic foams were examined. In both cases, total porosity increased with increasing the addition amount up to 30 mol%. With the same addition amount, the porosity of spinel-added foam was slightly larger than that of magnesia-added one. On pore expansion, relative density of pore shell decreased while the density degradation degree of magnesia-added foam was more serious than that of spinel-added one.