Nitridation Isothermal Kinetics of In Situ β-Sialon Bonded Al2O3-C Refractories

Xue Qing Yang; Nai Peng; Cheng Ji Deng

doi:10.4028/www.scientific.net/KEM.697.572

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Nitridation Isothermal Kinetics of In Situ β-Sialon Bonded Al₂O₃-C Refractories

Abstract:

The kinetics of in-situ β- Sialon bonded Al₂O₃-C (SAC) refractories were investigated by TGA techniques via isothermal nitridation experiments at different temperatures. The result show that the nitridation process of in-situ β-Sialon bonded Al₂O₃-C refractories can be divided into two stages: the nitridation reaction rate controlling stage in the first 10 min, and the apparent activation energy of nitridation reaction is 370 kJ/mol ; then the reaction is controlled by both chemical reaction and diffusion rate in the following 110 min, the apparent activation energy of nitridation reaction is 410 kJ/mol.