Abstract
A model for predicting the oxidation kinetics of non-oxide ceramics is developed on the basis of porous structure networks of the formed oxide scale. The evidence for a short-circuit oxygen diffusion path is examined theoretically. The differential equation of the gas diffusion process is solved according to an iterative procedure with the consideration of a moving boundary. When the controlling step is the inward diffusion of oxygen gas, the oxygen profile through the formed porous oxide scale is calculated according to Fick's second law. The relationships between the pore structure network and the effective diffusion coefficient and between the effective diffusion coefficient and the oxidation rate are discussed.
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