多孔質CaAl_4O_7単相及びCaAl_4O_7/CaZrO_3複合材料のIn Situ合成と微細構造

概要

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In situ processing and microstructure of calcium dialuminate (CaAl_4O_7)-based porous materials have been investigated. Powder mixtures of CaCO_3 and α-Al_2O_3(1:2 in molar ratio, doped with 0.5 mass% LiF), and CaCO_3, α-Al_2O_3, and ZrO_2 (2:2:1 with 0.5 mass% LiF) were prepared by a high-energy ball-mill process. Reactions of the powder mixtures during heating processes were revealed by high-temperature X-ray diffraction (HT-XRD), and by thermogravimetry and differential thermal analysis (TG-DTA). Porous CaAl_4O_7 monolith and its CaAl_4O_7/50mol% CaZrO_3 composite have been successfully synthesized using reactive pressureless sintering (at 1100-1200℃, for 2h in air) of powder mixtures. Both porous monolith and composite had homogeneous microstructure and very narrow pore-size distribution with mean pore size of 〜 1 μm. These porous materials, which are expected to have good thermal shock resistance, can be applied to high-temperature gas filters and lightweight structural components.
社団法人日本セラミックス協会の論文
2001-03-01