Abstract
A compact powder mixture consisting of 3Al2O3·2SiO2 (mullite) and Cr2O3, which was heated in a carbon powder bed, was cut into a 1 mm thickness sheet. The ceramic porous sheet composed of platelet (Cr, Al)2O3 crystals was prepared by leaching SiO2 contained in the sheet by hydrofluoric acid. The porous sheet produced from the 50 mass % mullite/50 mass % Cr2O3 compact, heated at 1500°C for 2 h, was composed of platelet crystals with 30 μm average length and 4.6 μm average thickness. Its relative density and specific surface area were 73 % and 4.4 m2 g-1 respectively.
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