The oxidation of two Fe-Nb alloys under low oxygen pressures at 600-800{degrees}C
- Pontificia Universidade Catolica do Rio de Janeiro (Brazil)
- Corrosion Science Lab, Shenyang (China); and others
The oxidation of two Fe-Nb alloys containing 15 and 30 wt.% Nb has been studied at 600-800{degrees}C under low oxygen pressures, similar to those prevailing in environments of the coal-gasification type. The reaction produced only an internal oxidation of niobium to form two niobium oxides (NbO{sub 2} and Nb{sub 2}O{sub 5}) and in some cases a double Fe-Nb oxide. The kinetics of this reaction were very slow at 600{degrees}C but rather these alloys is that the distribution of the internal oxides follows closely that of the Nb-rich phase in the original two-phase alloys. This behavior, as well as the lack of formation of external scales of niobium oxides, is mainly a result of the limited solubility of niobium in iron and of the consequent presence of two metal phases in the alloys.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 96463
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 5-6 Vol. 43; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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