Abstract
The oxidation of tantalum in oxygen-nitrogen and oxygen-inert gas mixtures at925°C has been studied. The oxygen pressure was close to 0.5 atm in all experiments, and partial pressures of the second component of from 0 to 180 Torr were employed. Spherical specimens were used to provide quantitatively significant kinetic data. A model has been proposed which suggests that the oxygen pressure at the reaction interface close to the metal surface is lower than the external pressure because of the finite permeability of the porous outer oxide layer, and that the inert gas effectively reduces the permeability. The model gives good quantitative agreement with the experimental results.
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References
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Stringer, J. Oxidation of tantalum in oxygen-nitrogen and oxygen-inert gas mixtures. Oxid Met 11, 225–239 (1977). https://doi.org/10.1007/BF00606059
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DOI: https://doi.org/10.1007/BF00606059