| Viscosity Study to Optimize a Slurry of Alumina Mixed with Hollow Microspheres |
| Syed Zaighum Abbas Bukhari, Jang-Hoon Ha, Jongman Lee, In-Hyuck Song |
| Powder and Ceramics Division, Korea Institute of Materials Science |
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| ABSTRACT |
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Porous alumina ceramics are involved in many industrial applications due to the exceptional properties of these products. This study addresses the preparation of porous alumina ceramics using hollow microspheres as a pore-forming agent and slip casting as a green-body-forming technique. A uniform distribution of pores is a basic requirement of a porous material. This study investigates three different slurry systems, i.e., as-prepared alumina slurry, alumina slurry electrostatically dispersed by hydrochloric acid (HCl), and slurry dispersed by the commercial dispersant 'Darvan C-N'. At a low viscosity, the hollow microspheres in the slurry tend to float, which causes a non-uniform pore distribution. To avoid this phenomenon, the viscosity of the slurry was increased to the extent that the movement of hollow microspheres ceased in the slurry. As a result, a uniform pore distribution was achieved. |
| Key words:
Porous materials, Alumina, Slip casting, Viscosity |
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