Alキレート化合物で表面改質されたシリカ粉体の成形性及び焼結性

概要

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Al chelate compounds with different carbon chain lengths were synthesized through reactions of aluminum sec-butoxide with acetoacetic acid ethyl ester (n=2), acetoacetic acid pentyl ester (n=5), acetoacetic acid octyl ester (n=8) and acetoacetic acid oleyl ester (n=18). Silica powder was modified with aluminum secbutoxide (ALK) and its Al chelate compounds abbreviated as C2, C5, C8 and C18 according to chain length. The effects of carbon chain length on the tap density, specific surface area, compaction and sintering behavior of modified silica were investigated. The tap density of modified silica decreased with an increase in the length of the carbon chain. In ALK, porous Al_2O_3 was formed by hydrolysis of aluminum sec-butoxide upon drying at 100℃. In contrast, in C2, C5, C8 and C18, porous Al_2O_3 was formed by thermal decomposition of Al chelate compounds above 200℃. The green density of the pressed bodies increased with an increase in the length of the carbon chain, resulting in the decrease in the porosity of sintered bodies fired at 1400-1500℃.
社団法人日本セラミックス協会の論文
2001-03-01