Abstract
The oxidation kinetics of tungsten wires in natural convection has been investigated in CO2-argon mixtures in the temperature range between 2450 and 3000K and the CO2 partial pressure range between 2.13 × 10-5 to 1.28 × 10-4 atm at 0.789 atm total pressure. The rate generally decreases with increasing temperature at constant bulk CO2 pressure with a magnitude ranging between 0.5 to 5 × 10-6 g/cm2 s. The oxidation reaction is gas transport controlled as demonstrated by supplemental measurements at 0.395 atm total pressure. A volatile oxide counter diffusion model, which has been previously proposed to explain the oxidation kinetics of tungsten wires in O2-argon mixtures, is in reasonable agreement with the data.
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References
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Harvey, F.J. High temperature oxidation of tungsten wires in CO2-argon mixtures. Metall Trans 5, 35–38 (1974). https://doi.org/10.1007/BF02642922
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DOI: https://doi.org/10.1007/BF02642922