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Nanocomposites in mullite-ZrO2 and mullite-TiO2 systems synthesised through alkoxide hydrolysis gel routes: microstructure and fractography

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Abstract

The sol-gel process allows preparation of very homogeneous and reactive monolithic, optically clear gels. Low-temperature thermal treatments (700–1000 °C) lead to amorphous optically clear samples (“glass”). Amorphous mullite compositions (0.4Al2O3-0.6SiO2 to 0.8Al2O3-0.2SiO2) retain large amounts of Ti and Zr elements. The crystallization has been studied by differential thermal analysis, dilatometry, X-ray and electron diffraction and Raman scattering. The nucleation begins above 1000 °C with the departure of the last protonic species, the amorphous matrix being completely crystallized only above 1400 °C. The addition of Zr and Ti elements leads to a homogeneous nucleation of phases with a composition close to ZrO2 and Al2Ti3O9 (EDX analysis) above the solubility limit. TEM and SEM analyses show that the precipitate size remains submicrometric over a wide temperature range (1000–1400 °C) and consequently glass-like mechanical properties, as well as toughening effects, caused by the presence of nanoprecipitates, are observed.

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Author notes

  1. Ph. Colomban

    Present address: ONERA, BP72 92322, Chatillon, France

Authors and Affiliations

  1. Groupe de Chimie du Solide, LPMC-U.A.1254 (CNRS), Ecole Polytechnique, 91128, Palaiseau, France

    Ph. Colomban

  2. Laboratoire de Chimie Appliquée de l'Etat Solide, CECM-CNRS, 15 rue Georges Urbain, 94400, Vitry sur Seine, France

    L. Mazerolles

Authors
  1. Ph. Colomban
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  2. L. Mazerolles
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Colomban, P., Mazerolles, L. Nanocomposites in mullite-ZrO2 and mullite-TiO2 systems synthesised through alkoxide hydrolysis gel routes: microstructure and fractography. J Mater Sci 26, 3503–3510 (1991). https://doi.org/10.1007/BF00557138

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  • DOI: https://doi.org/10.1007/BF00557138

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