Abstract
From the viewpoint of solving environmental problems, changeover from organic solvent-based system to water-based system in tape casting process has been required. The effects of organic additives on the rheological properties of water-based alumina slurries were investigated. The aqueous slurries were prepared from low-soda alumina powder, deionized water, ammonium salt of polycarboxylic acid type dispersant, emulsion type urethane polymer binder and defoamer. By means of the zeta potential measurement, the optimum content of added dispersant was estimated. Furthermore, precipitation test, viscosity measurement and so on were performed. From these measurements, it was decided that optimum amounts of dispersant and binder were 0.8 mass% and 12 mass%, respectively. Well-dispersed and high solid content slurry gave good quality green sheets, and high density sintered bodies were obtained.
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