Preparation of γ-alumina ceramic foams employing hydrophilated polyester polyurethane sponges
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Single phase γ-Al2O3 ceramic foams with high surface area (179 m2/g) and porosity (67%) were prepared by the polyurethane sponge replica method from slurries containing γ-Al2O3.
Ceramic foams are highly porous brittle materials with large voids (cells) . These cellular ceramics are special classes of porous materials comprised of cells with size ranging from a few microns to a few millimetres, where the cells can be surrounded by ceramic walls or contain solid material at only cell edges (struts), thus creating an interconnected structure (open cell foam) [1, 2, 3]. Ceramics foams are finding increasing applications as catalytic supports, ceramic membranes, sensors, filters, thermal and acoustic insulators, due to their properties such as low density, low thermal conductivity, high temperature stability, and high resistance to chemical attack . Due to the high calcination temperatures employed in the conventional preparation of alumina foams, α-Al2O3 is always obtained . For...
KeywordsFoam Sponge High Surface Area Alumina Foam Ceramic Foam
The authors would like to thank CDCH – UCV (PG: 08-00-6075-2005) for supporting this work.
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