シリカ-アルミナ超微粉体のコロイド状サスペンションのレオロジーと固化

概要

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Rheological properties of electrostatically stabilized colloidal suspensions and properties of consolidated powder compacts (density and pore size distribution) were studied with an ultrafine amorphous SiO_2-Al_2O_3 powder of an average size of 80 nm. Well-dispersed concentrated colloidal suspensions showing Newtonian flow were prepared with positively charged particles at pH 4.0. Green compacts with high densities and narrow pore size distributions were obtained by filtration of the Newtonian suspensions through a gypsum mold. The colloidal suspensions at pH 7.0 (isoelectric point) and pH 10.0 (negatively charged particles) showed Bingham flow and provided porous green compacts. The Bingham flow behavior was analyzed based on the Voight model representing a viscoelastic characteristic. Isostatic pressing of the porous green compacts increased the green densities and reduced the pore sizes.
社団法人日本セラミックス協会の論文
1990-09-01