金属アルコキシドの加水分解で合成されたMgO添加βアルミナ粒子の性質と焼結

概要

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Platelike β-alumina particles with an average size of 0.3μm were formed at 1100℃ from alkoxide-derived amorphous powder with the chemical composition (wt%) 9.3 Na_2O, 1.0 MgO, and balance Al_2O_3. No β"-alumina formed from the gel of mixed alkoxides. The particle size of theβ-alumina increased with increasing MgO content. Aggregation of the platelike particles in green compacts caused a tendency toward the formation of pores surrounded by flat planes, and pores of this type remained in the sintered samples. Densification of theβ-alumina powders was inhibited by MgO, and Al_2O_3 dissociated from theβ-alumina during sintering in an Na_2O-poor atmosphere. The Na_2O loss from green compacts in a semi-closed Pt container reached a constant value after a short sintering time and was suppressed in; an Na_2O-rich atmosphere. In addition, the evaporation behavior of MgO, measured during sintering at 1600℃, followed Henry's law in the MgO-Al_2O_3 system of β-alumina.
社団法人日本セラミックス協会の論文
1990-07-01