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J. Korean Ceram. Soc. > Volume 45(2); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(2): 99.
doi: https://doi.org/10.4191/kcers.2008.45.2.099
수성 알루미나/탄화규소 슬러리의 동결주조와 층상복합체의 제조: (I) 슬러리의 분산과 유동성
양태영, 조용기, 김영우1, 윤석영, 박홍채
부산대학교 재료공학부
1포항산업과학연구원 기능성재료연구팀
Freeze Casting of Aqueous Alumina/Silicon Carbide Slurries and Fabrication of Layered Composites: (I) Dispersion and Rheology of Slurries
Tae-Young Yang, Yong-Ki Cho, Young-Woo Kim1, Seog-Young Yoon, Hong-Chae Park
School of Materials Science and Engineering, Pusan National University
1Functional Materials Research Team, Research Institute of Industrial Science and Technology
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.
Key words: Alumina/silicon carbide nano-powder/silicon carbide whisker, Sedimentation density, Rheology, Shear thinning
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