Quantitative interpretation of the parabolic and nonparabolic oxidation behavior of nitride ceramic

The oxidation behavior of nitride ceramic under the conditions of different rate-controlling steps existing has been investigated from theoretical aspect. A series of formulae have been introduced to express the oxidation weight gain and oxide layer thickness as a function of temperature, time and the size of materials explicitly. They give an analytic solution, which simplifies the calculation and is convenient for theoretical analysis and discussion. Available experimental data in literature for oxidation of nitride ceramic were used to evaluate the model. Good agreement was obtained between theory and experimental data.