Fe-20Cr焼結合金の高温耐酸化性に及ぼすレア・アース酸化物分散添加の効果

概要

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The isothermal oxidation behavior in air at 1000, 1050 and 1100°C of Fe-20Cr alloys with 1 wt% dispersion of Y2O3, La2O3, Al2O3, TiO2, SiO2 and Cr2O3 prepared by a conventional sintering and rolling procedure was examined. It was found that the dispersion of SiO2, TiO2 and Cr2O3 reduced the oxidation resistance, while the dispersion of La2O3 and Y2O3 excellently improved the oxidation resistance of Fe-20Cr alloy. The oxidation rates during the early stage of oxidation were apparently dependent on the type of the dispersed oxides, while the grain size of the alloys was not dependent on the type of the dispersed oxides. There was no evidence that the dispersed particles accumulated at the alloy-scale interface. Ion microanalyses of the Cr2O3 scales formed after 1 hr oxidation at 1100°C revealed that all the dispersed elements were incorporated in the scale and the iron content of the scale was lower on the alloys which exhibited better oxidation resistance.
社団法人粉体粉末冶金協会の論文