Influence des transformations de phase de la zircone sur le comportement thermomécanique de réfractaires à très haute teneur en zircone

Abstract : This thesis, carried out under the research program ASZTech, focuses on the study of two fused cast refractories: an Alumina-Zirconia-Silica (AZS) product and a product with very High content of Zirconia (HZ), used in glass industry. These refractories containing non-stabilized zirconia are therefore subjected, during the annealing step (cooling), to the tetragonal (T) to the monoclinic (M) phase transition of zirconia associated with a very high volumetric expansion which is a source of stresses. This study aims at characterizing, during representative thermal treatments, the thermo-mechanical behavior of these materials, in correlation with the detected microstructural evolutions. Thanks to the analysis of their behavior under thermal stresses by acoustic techniques, the effect of the T-M transition of zirconia on the development of damage has been highlighted. In particular, the occurrence of a TRansformation Induced Plasticity (TRIP) phenomenon during the zirconia phase transition has been identified and characterized thanks to cooling tests under mechanical stress. In addition to this TRIP phenomenon which allows to relax the mechanical stresses induced during the phase transition, a diffuse damage phenomenon has been also identified for HZ product. Eventually, these data have led to an improvement of the numerical model which simulates the annealing step of industrial blocks. Moreover, the reliability of this model will be now checked by comparison to experimental measurements of residual stresses performed during this study.
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Fanny Gouraud. Influence des transformations de phase de la zircone sur le comportement thermomécanique de réfractaires à très haute teneur en zircone. Matériaux. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0110⟩. ⟨tel-01428750v2⟩

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