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Journal of Materials Science

, Volume 26, Issue 13, pp 3503–3510 | Cite as

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

  • Ph. Colomban
  • L. Mazerolles
Papers

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.

Keywords

SiO2 Electron Diffraction Differential Thermal Analysis Alkoxide Raman Scattering 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1991

Authors and Affiliations

  • Ph. Colomban
    • 1
  • L. Mazerolles
    • 2
  1. 1.Groupe de Chimie du Solide, LPMC-U.A.1254 (CNRS)Ecole PolytechniquePalaiseauFrance
  2. 2.Laboratoire de Chimie Appliquée de l'Etat SolideCECM-CNRSVitry sur SeineFrance

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