Slip casting of basic aqueous SiC slurry containing styrene/maleic copolymer

Silicon carbide was fabricated with high density by slip casting. The fluidity of aqueous slurry was controlled with styrene/maleic dispersant (SM) and tetramethylammonium hydroxide (TMAOH) in a finely designed milling. Effects of the dispersants on the dispersion and the fluidization of the slips w...

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Bibliographic Details
Published in:Key engineering materials 1999-01, p.157-162
Main Authors: Obata, S, Oda, K, Kinugasa, H, Asano, H, Sakurada, O, Hashiba, M, Hiramatsu, K, Nurishi, Y
Format: Article
Language:English
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Summary:Silicon carbide was fabricated with high density by slip casting. The fluidity of aqueous slurry was controlled with styrene/maleic dispersant (SM) and tetramethylammonium hydroxide (TMAOH) in a finely designed milling. Effects of the dispersants on the dispersion and the fluidization of the slips were discussed. The highest firing densities of 97.5 and 96.8 percent Th.D were attained for alpha and beta-SiC, respectively. Analysis of the flow curves and flow point data indicated that SM worked mainly on the C surfaces, and the coexistent base worked on the oxidized part of SiC. Changes in zeta-potential for SiC particles showed that the dispersions and the thickening of slips were possible in the pH region where the particles had high surface charges. The shear rate-shear stress curves of the slurries at low shear rate were important for thickening and casting. (Author)
ISSN:1013-9826