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Article Dans Une Revue Ann. Chim. Sci. mat. Année : 2007

Elaboration and microstructural characterization of a mullite-zirconia composite obtained by reaction sintering

Résumé

A significant toughening could be obtained by incorporating zirconia (ZrO2) particles in a mullite matrix (3Al2O 3.2SiO2). The mechanism involved in the toughening of mullite composites by zirconia addition is a stress-induced structural transformation of zirconia (tetragonal to monoclinic). In this work, we elaborated by reaction sintering a mullite-zirconia composite from a stoichiometric powder mixture of monohydrated alumina (Boehmite AlOOH) and zircon (ZrSiO4). Reactions and phase transformations during the powder sintering were studied by dilatometry, DTA-TGA, XRD and SEM. The dilatometric curves and differential thermal analysis showed several microstructure transformations in these mixtures. From the X-ray diffractograms, we put in evidence the zircon decomposition (into zirconia and silica) and the mullite-zirconia composite formation, by reaction sintering (with the boehmite), starting from a temperature of 1450°C. The micrographic observations of the samples showed also a presence of dispersed fine zirconia particles of rounded shape in the mullite matrix.

Domaines

Matériaux
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Dates et versions

hal-00434112 , version 1 (20-11-2009)

Identifiants

  • HAL Id : hal-00434112 , version 1

Citer

Hocine Belhouchet, M. Hamidouche, N. Bouaouadja, Vincent Garnier, Gilbert Fantozzi. Elaboration and microstructural characterization of a mullite-zirconia composite obtained by reaction sintering. Ann. Chim. Sci. mat., 2007, pp.605-614. ⟨hal-00434112⟩
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