(Fe,Al)_2O_3からCO-CO_2で還元されたAl_2O_3分散鉄の微細組織(製鉄)

概要

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Carbon monoxide reduction of (Fe,Al)_2O_3 was carried out in order to clarify the possibility for ODS to be made by selective reduction of solid solution. The microstructure of reduction product was observed with XRD, SEM and EDS. The results are summarized as follows. The precipitate particle of about 100 nm was observed in iron reduced by 97%CO-3%CO_2 at 1273-1373 K and was identified as k'-Al_2O_3. On the other hand, the precipitate particle was Fe(Fe,Al)_2O_4 of spinel structure by using low reducing potential gas of 80%CO-20%CO_2. The size of their particle was more than 200 nm. And then, the sequential reduction of (Fe,Al)_2O_3 by various CO-CO_2 ratios at 1273 K was carried out to investigate the structure transformation of products during CO reduction. Solid solution of (Fe,Al)_2O_3 was reduced to solid solution of Fe_3O_4(FeOAl_2O_3). When the iron oxide was reduced to 'FeO', the Fe_3O_4(FeOAl_2O_3) was transformed to 'FeO' and Fe(Fe,Al)_2O_4 of spinel structure with the irregular shape. The solubility of Al_2O_3 in 'FeO' was less than 1%. It seemed that the size of Al_2O_3 particle in reduced iron depends on the that of Fe(Fe,Al)_2O_4 particle in FeO, which was af- fected by reducing potential.
社団法人日本鉄鋼協会の論文
2008-07-01