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Oxidation kinetics of niobium in the temperature range of 873 to 1083 K

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Abstract

Oxidation kinetics of niobium (columbium) in oxygen are investigated in the temperature range of 873 to 1083 K. The observed abnormal dependence of the linear oxidation rate on temperature is suggested to be due to the relative amount of NbO2 in the oxide scale. The amount of oxygen dissolved in the metal is calculated and it constitutes a small fraction of the total oxygen uptake. From hardness measurements, the oxygen diffusion coefficient in Nb can be expressed as:D = 2.72 × 10−3 exp ( − 95.4/R T) with the activation energy in kjoule/mole.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgical Engineering, University of Cincinnati, 45221, Cincinnati, OH

    James T. Clenny (Consulting Engineer) & Casimir J. Rosa (Professor)

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  1. James T. Clenny
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  2. Casimir J. Rosa
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Clenny, J.T., Rosa, C.J. Oxidation kinetics of niobium in the temperature range of 873 to 1083 K. Metall Trans A 11, 1385–1389 (1980). https://doi.org/10.1007/BF02653493

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