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OXIDATION OF TWO Fe-Nb ALLOYS UNDER LOW OXYGEN PRESSURES AT 600~800℃ |
Niu Yan;Rebelo M C;Gesmundo F; Rizzo F C(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences; Shengyang 110015 )(Depertamento de Ciencia dos Materiais e Metolurgia; Poritificia Univ |
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Abstract The oxidation of two Fe-Nb alloys containing 15 and 30 wt% Nb respectively was studied at 600~800℃finder low oxygen pressures, similar to the environments prevailing in coal gasification. The main reaction was internal oxidation of niobium with the formation of niobium oxides (NbO2 and Nb2O5) and in some cases of a double Fe-Nb oxide. The kinetics of this reaction was very slow at 600℃ but rather fast at 700and 800℃. A peculiar feature of the internal oxidation of these alloys was that the distribution of the internal oxides was the same as that of the Nb-rich phase in the original two-phase alloys. This behavior and the lack of formation of external scales of niobium oxides were mainly the result of the limited solubility of niobium in iron and of the consequent. presence of two phases in the alloys under examination.
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Received: 25 April 1996
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Cite this article:
Niu Yan;Rebelo M C;Gesmundo F; Rizzo F C(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals;Chinese Academy of Sciences; Shengyang 110015 )(Depertamento de Ciencia dos Materiais e Metolurgia; Poritificia Univ. OXIDATION OF TWO Fe-Nb ALLOYS UNDER LOW OXYGEN PRESSURES AT 600~800℃. J Chin Soc Corr Pro, 1996, 16(2): 107-114.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I2/107
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