한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제52권6호
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  • Pages.403-409
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  • 2015
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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Viscosity Study to Optimize a Slurry of Alumina Mixed with Hollow Microspheres

  • Bukhari, Syed Zaighum Abbas (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Ha, Jang-Hoon (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Lee, Jongman (Powder and Ceramics Division, Korea Institute of Materials Science) ;
  • Song, In-Hyuck (Powder and Ceramics Division, Korea Institute of Materials Science)
  • 투고 : 2015.08.07
  • 심사 : 2015.10.16
  • 발행 : 2015.11.30
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초록

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.

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참고문헌

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