ヘキサアルミネート系多孔質焼結体の作製と微細構造

概要

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Heat resistant porous ceramics were fabricated by sintering of sol gel-derived hexaaluminate fine powders at 1200°-1600℃. Although the sintered samples showed high porosities (ca. 50%), the N_2 permeability is low because of small pore size (<100 nm) . The packing of planar particles of hexaaluminate formed two kinds of peaks in their pore size distribution at <10 nm and 100 nm. Second-stage sintering of the crushed powders significantly enhanced the N_2 permeability. In the samples after second-stage sintering, the loose packing of large agglomerates formed macropores (>10 μm) besides the voids of primary particles. These macropores are effective for high gas permeation. Consequently, the second-step sintering of hexaaluminate attains the mixed structure of micropores and macropores, which is a possible microstructure for application to filtration catalysts.
社団法人日本セラミックス協会の論文
1990-06-01