カオリン-シリカ-アルミナセラミックスの気孔及び浸透構造

概要

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The pore structure and permeation properties of kaolin-silica (quartz)-alumina (corundum) ceramics have been investigated using kaolin, SiO_2 and Al_2O_3 powders as staring materials. The Al_2O_3 powders used are of different particle sizes, 0.8 and 4.0 μm. Mullite phase appears at approximately 1373 K and mullite phase content in the sintered samples increases with the increase in sintering temperature from 1373 to 1573 K for 1 h. Open porosity decreases from 48.4 and 46.8% to 32.3% for the 0.8- and 4.0-μm Al_2O_3 powders, respectively. The maximum average pore sizes have been noted to be 0.51- and 0.63-μm for the 0.8- and 4.0-μm Al_2O_3 powders as-sintered at 1473 K, respectively. The maximum penetrating porosity is 24.1% for the 0.8-μm Al_2O_3 powder as-sintered at 1473 K ; it decreases with the increase in temperature for the 4.0-μm Al_2O_3 powder. The tortuosity of the 0.8-μm Al_2O_3 powder does not change significantly, but that of the 4.0-μm Al_2O_3 powder decreases from 0.85 to 0.29 with the increase in sintering temperature. Seemingly, the mullite-based filtration material has been shown to be more efficient and durable than conventional polymeric and diatomite materials.
社団法人日本セラミックス協会の論文
2003-08-01