金属アルコキシドからのジルコニアバルーンの合成(第2報) : バルーンの微小化とバルーン構造

概要

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Zirconia balloons were molded from a formamide/benzene/formamide (F/B/F) emulsion. Balloons of several tens μm in size could be fabricated by dispersing 1.5 mol・l^<-1>Zr (OC_4H_9^n)_4 benzene solution into formamide at 8000 rpm. The size of the obtained zirconia balloon precursors ranged from 1 μm to 50 μm and its mean diameter was ≈ 20 μm. Upon heat-treating at 1300℃ zirconia balloon precursors transformed to zirconia balloons. The size distribution of heat-treated balloons was in the range between 1 and 45 μm with a mean value of ≈ 10 μm in diameter. The percentage of unflawed balloons was 91% after heat-treatment. The crust microstructure of the zirconia balloon changed with crust thickness. For thicknesses > 1.5 μm, the crust was constructed of about 0.3 μm grains in diameter and had dense inner and outer surface layers. Pores were observed between these surface layers. For thicknesses between 0.3 and 0.9 μm, the balloon crust was constructed by one to three 0.3 μm grains in diameter. Decreasing crust thickness to less than 0.3 μm, a single plate like grain was observed.
社団法人日本セラミックス協会の論文
2003-08-01