Preparation of dense alumina ceramic by slip casting method

Abstract

Present work focuses on the densification of alumina body by slip casting method. The optimization of slurry and sintering has been done at 1650oC. The alpha-alumina phase of ~1 micron particle size has been used as starting material. Along with alumina some additives like PMAA, MgO-salt, and PVA has been used to prepare slurry. The study of the densification of alumina body at varying soaking time of 2, 4, and 6 hours has also been carried. For better densification of alumina body, MgO salt has been used followed by acid treatment of the slurry. The microstructure of the sintered body is analyzed and densification due to a grain growth has been observed. We are successful to minimize the porosity up to 0.7% and preparing a dense product. The Brazilian disk test and compressive strength testing has been carried out for testing of mechanical property and was found to have good tensile and compressive strength.