混合導電性ペロブスカイト型酸化物を用いる酸素選択透過膜の開発(第1報) : ペロブスカイト型酸化物多孔性支持体の作製

概要

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Preparation of porous substrates ( discs) of La_<9.6>Sr_<9.4>CoO_3(LSCO) was investigated as a part of the study on an oxygen semipermeable device based on mixed conductive perovskite-type oxides. Of the several methods attempted, sintering of compacts of an LSCO powder-methylcellulose (MC) mixture and an LSCO-carbon fiber (CF) mixture gave discs with irregular macro-pores which tended to grow parallel to the disc surface or with straight penetrating channels with a uniform diameter, respectively. However, none of them exhibited sufficiently large (physical) air permeability. On the other hand, sinter ing of a compact of LSCO powder was far more effective if an adequate starting powder was chosen. Thus, when the LSCO powder calcined at 1400℃ (LSCO(1400)) with the particle size larger than 10μm was used, the disc sintered at 1400℃ showed high air permeability through penetrating channels consisting of a network of intergranular pores. Furthermore, when LSCO (1400) powder was sieved to 44-74 μm, the sintered disc had uniform-sized open pores with a diameter of 20 to 30μm, which provided porous structure resistant to heat treatment and high permeability of air. The disc appeared to be suitable as a porous support on which thin membrane of oxygen semipermeable perovskite-type oxides was formed.
社団法人日本セラミックス協会の論文
1989-04-01