Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Freeze Casting of Aqueous Alumina/Silicon Carbide Slurries and Fabrication of Layered Composites: (I) Dispersion and Rheology of Slurries

수성 알루미나/탄화규소 슬러리의 동결주조와 층상복합체의 제조: (I) 슬러리의 분산과 유동성

  • Yang, Tae-Young (School of Materials Science and Engineering, Pusan National University) ;
  • Cho, Yong-Ki (School of Materials Science and Engineering, Pusan National University) ;
  • Kim, Young-Woo (Functional Materials Research Team, Research Institute of Industrial Science and Technology) ;
  • Yoon, Seog-Young (School of Materials Science and Engineering, Pusan National University) ;
  • Park, Hong-Chae (School of Materials Science and Engineering, Pusan National University)
  • 양태영 (부산대학교 재료공학부) ;
  • 조용기 (부산대학교 재료공학부) ;
  • 김영우 (포항산업과학연구원 기능성재료연구팀) ;
  • 윤석영 (부산대학교 재료공학부) ;
  • 박홍채 (부산대학교 재료공학부)
  • Published : 2008.02.29
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Abstract

Zeta potential, sedimentation bulk density and rheology in the dispersion system have been studied in terms of solid loading (40-55 vol%), and types of additives. Ammonium polymethacrylate, glycerol, ethoxylated acetylenic diol, and polyvinyl alcohol have been used as the dispersant, cryo-protectant, surfactant, and binder, respectively. Sedimentation density greatly increased upon adding dispersant; the effect was more pronounced with ionic alumina suspension compared with covalent silicon carbide. With further addition of cryo-protectant and surfactant to dispersant, the sedimentation density increased somewhat. The suspension viscosity generally behaviored in an opposite manner to the sedimentation density, i.e., high sedimentation gave low high-shear viscosity, indicative of low order structure formation in the suspended particles. Shear rate rheology in shear rate of $2-300\;sec^{-1}$ showed a shear thinning and its onset began at similar shear rate (${\sim}100\;sce^{-1}$), regardless of solid loading.

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References

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