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Microporous alumina membrane substrate in tubular and planar configurations have been prepared by gelcasting of alumina powder slurry using high amount of urea–formaldehyde as gelling agent followed by humidity controlled drying, binder removal and sintering of the gelled bodies. Porosity of the substrate samples sintered at 1350°C was more than 70% as measured by mercury porosimeter. More than 51%...
The present work reports a simple process for preparation of macroporous alumina ceramics from aqueous powder slurries using wheat particles as gelling and pore forming agent. Wheat particles incorporated in aqueous alumina slurries rapidly absorb water on heating and transform it into a strong gel. The gelled bodies did not undergo crack and warpage during drying. The dried green bodies showed diametrical...
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