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Article Dans Une Revue Annales de Chimie - Science des Matériaux Année : 2010

Kinetics of mullite formation in zircon and boehmite mixture

H. Belhouchet
M. Hamidouche
  • Fonction : Auteur

Résumé

The kinetics of zircon decomposition and mullite formation in ZrSiO 4-Al2O3 ceramics were investigated under non-isothermal conditions using differential thermal analysis (DTA). The mullite-zirconia composites were prepared by reaction sintering of the zircon and boehmite mixtures. The DTA conducted at heating rates of 5,10,20 and 30°C.min-1 showed an endothermic peak at about 1500°C associated with zircon dissociation and mullite formation. This crystallization temperature increased slightly with increasing heating rate. The non-isothermal activation energy (Ea) of zircon decomposition and mullite formation, calculated by Johnson-Mehl-Avrami equation and Kissinger's method, were respectively 1272 and 1242 kJ/mol. The growth morphology parameter n was found to be almost equal to 2.6. The analysis of the results indicates that the bulk nucleation was dominant in mullite crystallization followed by three-dimensional growth. © Lavoisier.

Dates et versions

hal-01813943 , version 1 (12-06-2018)

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Citer

H. Belhouchet, M. Hamidouche, N. Bouaouadja, V. Garnier, Gilbert Fantozzi. Kinetics of mullite formation in zircon and boehmite mixture. Annales de Chimie - Science des Matériaux, 2010, 35 (1), pp.17-25. ⟨10.3166/acsm.35.17-25⟩. ⟨hal-01813943⟩
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