Abstract
The oxidation behavior of tantalum in steam was investigated in the temperature range of 600–1100 °C. Thermogravimetric measurements were used to determine the oxidation behavior of the Ta metal at different steam partial pressures (10, 50 and 100 kPa). As a result of the oxidation tests, the samples show parabolic behavior for the initial period of oxidation, which is almost not visible at temperature higher than 700 °C. After the short parabolic kinetics, breakaway occurs and turns the kinetics from parabolic to linear. In this work kinetic parameters of the linear oxidation were determined. The influence of the samples´ shape was investigated using both plate and cylinder specimens. Experiments aimed at quantifying the hydrogen uptake of tantalum were conducted at temperatures between 600 and 1000 °C, and results differ from the expected ones applying the Sieverts’ law. Post-test optical microscopy was performed in order to analyze the post-oxidation appearance of the materials. The oxide scale appeared non-protective, especially at low temperature.
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