混合アルコシキドの加水分解によるSiO_2-Al_2O_3微粉体の合成

概要

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Mixtures of Al(OC3H7i)3 and Si(OC2H5)4 corresponding to xAl2O3⋅2SiO2(x=1, 2, 3, 4) were dissolved in benzene and refluxed (81°-83°C) under a dried N2 flow. Hydrolysis with equivalent amount of distilled water to formation of SiO2 and Al(OH)3 gave amorphous powders showing an exothermic peak at 980°C in DTA connected with crystallization to Al-Si spinel and mullite. Phases produced in the powders and disks heated at 800°-1620°C were compared with a phase diagram of the SiO2-Al2O3 system. Compositions of mullite formed at 1400°C and 1550°C were estimated from the lattice constant a0. Average particle size of the SiO2-Al2O3 powders heat-treated at 1400°C for 3h, which showed narrow size distributions, were ≈0.15μm for x=1 and 2, and 0.082-0.089μm for x=3 and 4, respectively.
社団法人日本セラミックス協会の論文
1985-09-01