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- W4308541760 abstract "Abstract We present a numerical model to predict oxide scale growth on tungsten surfaces under exposure to oxygen at high temperatures. The model captures the formation of four thermodynamically-compatible oxide sublayers, WO 2 , WO 2.72 , WO 2.9 , and WO 3 , on top of the metal substrate. Oxide layer growth is simulated by tracking the oxide/oxide and oxide/metal interfaces using a sharp-interface Stefan model coupled to diffusion kinetics. The model is parameterized using selected experimental measurements and electronic structure calculations of the diffusivities of all the oxide subphases involved. We simulate oxide growth at temperatures of 600 ∘ C and above, extracting the power law growth exponents in each case, which we find to deviate from classical parabolic growth in several cases. We conduct a comparison of the model predictions with an extensive experimental data set, with reasonable agreement at most temperatures. While many gaps in our understanding still exist, this work is a first attempt at embedding the thermodynamic and kinetic complexity of tungsten oxide growth into a comprehensive mesoscale kinetic model that attempts to capture the essential features of tungsten oxidation to fill existing knowledge gaps and guide and enhance future tungsten oxidation models." @default.
- W4308541760 created "2022-11-12" @default.
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- W4308541760 date "2022-11-18" @default.
- W4308541760 modified "2023-10-18" @default.
- W4308541760 title "Multilayer interface tracking model of pure tungsten oxidation" @default.
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- W4308541760 doi "https://doi.org/10.1088/1361-651x/aca111" @default.
- W4308541760 hasPublicationYear "2022" @default.
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