ISSN 2594-5327
52º Congresso anual — Vol. 52 , num. 1 (1997)
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The oxidation of Fe-Ce alloys containing 2 and 5 at.%Ce has been studied at 600–800°C in air. Fe-2Ce and Fe-5Ce alloys are oxidized slower than pure Fe at 700°C and 800°C except the initial stage of the Fe-5Ce at 700°C, but still go through a faster oxidation than pure Fe at 600°C. The oxidation of Fe-5Ce at 800°C follows an approximately parabolic rate law, but includes two distinct parabolic stages at 600 and 700°C. Fe-2Ce goes through an approximately parabolic oxidation at 600 and 800°C, but two parabolic oxidation stages at 700°C. The oxide scales grown on Fe-2Ce and Fe-5Ce alloys at 800°C are composed of external pure Fe oxides containing Fe₂O₃, Fe₃O₄ and FeO among which FeO constitutes the main iron oxides, and inner mixed scale of FeO and CeFeO₃. Besides the above products, CeO₂ which usually locates at the outmost part of inner mixed zone also forms at 700°C. The scales grown on Fe-2Ce and Fe-5Ce at 600°C constitute Fe₂O₃, Fe₃O₄ and CeO₂ with little FeO. The Ce-containing oxides follows the distribution of original intermetallic compound phase in the alloys. The effect of Ce on the oxidation of pure Fe has been discussed.
The oxidation of Fe-Ce alloys containing 2 and 5 at.%Ce has been studied at 600–800°C in air. Fe-2Ce and Fe-5Ce alloys are oxidized slower than pure Fe at 700°C and 800°C except the initial stage of the Fe-5Ce at 700°C, but still go through a faster oxidation than pure Fe at 600°C. The oxidation of Fe-5Ce at 800°C follows an approximately parabolic rate law, but includes two distinct parabolic stages at 600 and 700°C. Fe-2Ce goes through an approximately parabolic oxidation at 600 and 800°C, but two parabolic oxidation stages at 700°C. The oxide scales grown on Fe-2Ce and Fe-5Ce alloys at 800°C are composed of external pure Fe oxides containing Fe₂O₃, Fe₃O₄ and FeO among which FeO constitutes the main iron oxides, and inner mixed scale of FeO and CeFeO₃. Besides the above products, CeO₂ which usually locates at the outmost part of inner mixed zone also forms at 700°C. The scales grown on Fe-2Ce and Fe-5Ce at 600°C constitute Fe₂O₃, Fe₃O₄ and CeO₂ with little FeO. The Ce-containing oxides follows the distribution of original intermetallic compound phase in the alloys. The effect of Ce on the oxidation of pure Fe has been discussed.
Palavras-chave
Pure Fe, Fe-2Ce, Fe-5Ce, Oxidation, Double oxide
Pure Fe, Fe-2Ce, Fe-5Ce, Oxidation, Double oxide
Como citar
Assunção, Fernando Cosme Rizzo; Zeng, Chaoliu; Monteiro, Maurício de Jesus; Wu, Weitao.
Oxidation of Fe-2 and 5 at.%Ce Binary Alloys at 600–800°C in Air,
p. 867-888.
In: 52º Congresso anual,
São Paulo, Brasil,
1997.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00059-867-888
