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http://dx.doi.org/10.4191/KCERS.2002.39.2.164

Dispersion and Rheological Characteristics of Alumina Slurries in Aqueous Tape-casting Using Acrylate Binder  

Cho, Yu-Jeong (Department of Ceramic Engineering, Yonsei University, Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Park, Il-Seok (Department of Ceramic Engineering, Yonsei University, Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Moon, Joo-Ho (Department of Ceramic Engineering, Yonsei University)
Kim, Dae-Joon (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.2, 2002 , pp. 164-170 More about this Journal
Abstract
Measurements of sedimentation, solid loading, zeta potential, and viscosity were employed to determine a proper dispersant and its amount for a well dispersed alumina powders in aqueous alumina tape casting using acrylate as a binder. Polycarboxylic acid was the most effective one among various dispersants considered in the present study and its amount was 0.23∼0.24 g per 100 g alumina for a dispersion. Better dispersion was obtained as an increase of dispersant addition. However, the dispersion was hindered as the amount of dispersant was higher than the optimum amount because of bridging or tangling of polymer chains. Excellent aqueous alumina tapes were prepared from the slurry containing the optimum amount of the polycarboxylic acid (0.2g), alumina powders(100 g), acrylate and Benzoflex as binder and plasticizer, respectively. The viscosity of the slurry was 570 cps and the alumina loading in the tape was 57 vol%.
Keywords
Dispersion; Dispersant; Water-based tape casting; Alumina;
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