High Pressure Oxidation of Niobium
- 1 January 1956
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 103 (6) , 326-330
- https://doi.org/10.1149/1.2430322
Abstract
Niobium oxidizes according to the linear rate law from 400°–800°C (14.7–605 psia O2). The oxidation rate is extremely pressure sensitive above 550°C. Theoretical considerations indicate that an equilibrium adsorption process occurs prior to the rate‐determining step. It was necessary to include a term in the rate equation for the interaction between the adsorbed molecules to interpret results above 650°C. The interaction energy is influenced by the initial orientation of the metal surface. The activation energy for the oxidation process is approximately 9 to 10 kcal (500°–800°C).Keywords
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