金属アルコキシドから合成されたSrTiO_3微粒子の水中分散に関する陰イオン界面活性剤の検討とそのシート成形に及ぼす影響

概要

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Effects of anionic surfactants on the dispersion of alkoxide-derived SrTiO_3 particles in water and on the formation of SrTiO_3 ceramic sheets were studied in detail. Five kinds of anionic surfactants were enamined. All these surfactants enhanced the dispersion of the SrTiO_3 particles in water. Green sheets were prepared from the SrTiO_3 suspensions in aqueous media to which the surfactants and PVA(poly(vinyl alcohol))were added. The crack- and deformation-free green sheets were obtained from two kinds of suspensions containing the oily alkylbenzertesulfonate type surfactant(mass ratio : SrTiO_3/PVA/surfactant=100/15/20 and 100/15/25). These green sheets were composed of the particles with diameter less than 1μm. The SrTiO_3 ceramic sheets were obtained by heating the green sheets at 1300°C. Linear shrinkage of the sheets during the heat treatment was 30%. Bulk density of the SrTiO_3 Ceramic sheets was 4.97 g・ cm^<-3>.
社団法人日本セラミックス協会の論文
1999-11-01