Abstract
Abstract The oxidation kinetics of β-SiA10N (Si3Al3O3N5) powder prepared by reaction sintering have been investigated from both experimental and theoretical aspects. In the oxidation experiments, X-ray diffraction, optical microscopy and thermogravimetry were used to study the oxidation mechanism and kinetics of β-SiAlON powder. Based on the ex-perimental data, a new model for predicting the oxidation process of β-SiAlON powder has been developed, which offers an analytic form expressing the oxidation mass change as a function of time and temperature. The effect of particle size distribution on oxidation has especially been discussed. The new model was used to predict the oxidation behavior of β-SiAlON powder and the calculated results agreed well with the experimental data with the activation energy to be 253 kJ · mol−1.
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