PREPARATION AND PROPERTIES OF POROUS ALUMINA CERAMIC PRODUCED BY AN EXTRUSION PROCESS
Keywords:
Alumina, titania, porous ceramic, extrusionAbstract
Porous alumina ceramic was fabricated by an extrusion method with the addition of titania as a sintering additive up to 20 wt%. Alumina powders were mixed and kneaded with titania and organic additives including binder (carboxy methyl cellulose, 7 wt% based on dry weight of alumina and titania; all wt% mentioned in this study based on the amount of inorganic powders excluding water), co-binder (polyvinyl alcohol, 1 wt%), plasticizer (polyethylene glycol, 0.5 wt%), lubricant (glycerin oil, 1 wt%), and solvent (water, 23 wt%). The resulting dough was extruded, dried at room temperature for 48 hours, and sintered at 1200oC for 1 hour in an electrical box furnace. The phasecomposition, microstructure, mechanical strength, and porosity of the sintered porous bodies were also investigated. With 5 and 10 wt% of TiO2, the bending strength of the sintered specimens ishigher than 18MPa with porosity of more than 40%.
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