Abstract
Non-parabolic kinetics have been frequently observed for the oxidation of Si-based structural ceramics. To account for the non-parabolic behaviour, a new model has been developed, the mathematical form of which is Δw/A o =a aictan(bt+b)1/2 + c(t b ′ b −1)1/2 where Δw/A o is the measured weight gain per unit surface area, t is the time and a, b, b’ and c are constants. It is shown that this law yields apparently consistent parabolic rate constants, K p, and activation energies, E a, when applied to data obtained from the oxidation of fully dense polycrystalline Si3N4, Si2N2O and sialon ceramics.
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© 1994 Springer Science+Business Media New York
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Käll, PO., Nygren, M., Persson, J. (1994). Non-Parabolic Oxidation Kinetics of Advanced Ceramics. In: Nickel, K.G. (eds) Corrosion of Advanced Ceramics. NATO Science Series E: (closed), vol 267. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1182-9_6
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DOI: https://doi.org/10.1007/978-94-011-1182-9_6
Publisher Name: Springer, Dordrecht
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