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http://dx.doi.org/10.4191/KCERS.2008.45.2.099

Freeze Casting of Aqueous Alumina/Silicon Carbide Slurries and Fabrication of Layered Composites: (I) Dispersion and Rheology of Slurries  

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)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.2, 2008 , pp. 99-104 More about this Journal
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.
Keywords
Alumina/silicon carbide nano-powder/silicon carbide whisker; Sedimentation density; Rheology; Shear thinning;
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