Oxidation mechanism of tantalum in carbon dioxide

The oxidation of tantalum plates in carbon dioxide between 700 and 880°C at a pressure of 100 kPa, leads to the dissolution of oxygen in the metal, the nucleation of the suboxide TaOz and the growth of a non-protective coating of βTa2O5. After an initial decelerated period, the kinetics become conti...

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Bibliographic Details
Published in:Journal of alloys and compounds 2002-04, Vol.336 (1-2), p.270-279
Main Authors: Bouzouita, K, Desmaison, J
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Mechanical properties
Metals
Microstructure
Oxidation
Physics
Surface treatments
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Summary:The oxidation of tantalum plates in carbon dioxide between 700 and 880°C at a pressure of 100 kPa, leads to the dissolution of oxygen in the metal, the nucleation of the suboxide TaOz and the growth of a non-protective coating of βTa2O5. After an initial decelerated period, the kinetics become continuously accelerated. To correlate the curve shape with the morphological development of the oxide scale, the proposed oxidation model associates in parallel the diffusion of oxygen in the substrate and a phase boundary process in which the nucleation of TaOz constitutes a necessary step for the formation of Ta2O5.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(01)01884-9