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研究了二元Fe-2Ce和Fe-5Ce合金及纯Fe在600-800℃空气中的氧化行为.纯Fe在该温度范围的氧化均符合抛物线规律.Fe-5Ce合金在800℃氧化近似符合抛物线氧化规律,但在600和700℃则明显由两个抛物线阶段组成.Fe-2Ce合金在三个温度下近似抛循抛物线氧化规律.除Fe-5Ce合金在700℃氧化初期外,Fe-Ce合金在700和800℃的氧化速度比纯Fe低.但在600℃,Fe-Ce合金的氧化速度仍高于纯Fe.在700和800℃时,在Fe-Ce表面除形成三种Fe的氧化物外,还在氧化膜的内层形成双相氧化物CeFeO3.而在600℃时,仅形成Fe的氧化物和CeO2,并且FeO在Fe的氧化物中所占比例很小.此外,讨论了Ce在Fe-Ce合金氧化过程中的作用.
The oxidation behavior of binary Fe-2Ce and Fe-5Ce alloys and pure Fe in air at 600-800 ℃ was studied. The oxidation of pure Fe in this temperature range all accord with the law of parabola. The oxidation of Fe-5Ce alloy at 800 ℃ approximates the parabolic oxidation law, but it obviously consists of two parabolic phases at 600 and 700 ℃. Fe-2Ce alloy parabolic oxidation law approximates parabolic at three temperatures. Except Fe-5Ce alloy at 700 ℃ for initial oxidation, the oxidation rate of Fe-Ce alloy at 700 and 800 ℃ was lower than pure Fe. However, at 600 ℃, the oxidation rate of Fe-Ce alloy is still higher than pure Fe. At 700 and 800 ℃, in addition to the formation of three kinds of Fe oxide on the surface of Fe-Ce, a double phase oxide CeFeO3 was also formed on the inner layer of the oxide film. At 600 ° C, however, only Fe oxides and CeO2 are formed, and the proportion of FeO in the oxide of Fe is small. In addition, the role of Ce in the oxidation of Fe-Ce alloys was discussed.