Follow-up of zirconia crystallization on a surface modified alumina powder

V. Naglieri, L. Joly-Pottuz, J. Chevalier, M. Lombardi, L. Montanaro

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Here we report how thermal treatments of a surface modified α-alumina powder on which a zirconium oxide precursor was grafted can be tailored so as to obtain an alumina-zirconia composite powder with well-controlled phase distribution and size. The transformation of the zirconia precursor from a starting amorphous phase to zirconia nano-grains bonded to the alumina particles surface was followed by X-ray diffraction (performed at room temperature on different thermally treated powders, as well as in situ at high-temperature) and by both conventional and high resolution transmission electron microscopy (TEM and HRTEM). Phase and nanostructure evolutions were followed on a large temperature span. The crystallization kinetics were analysed in terms of nucleation-growth mechanisms by exploiting Avrami-Johnson-Mehl-Kolmogorov formalism. Based on the above investigations, a tentative description of nucleation and growth features is proposed. This knowledge-based step represents a first approach towards nanopowders engineering.

Original languageEnglish
Pages (from-to)3377-3387
Number of pages11
JournalJournal of the European Ceramic Society
Volume30
Issue number16
DOIs
Publication statusPublished - 2010 Dec
Externally publishedYes

Keywords

  • Calcination
  • Grain growth
  • Microstructure-final
  • Microstructure-prefiring
  • Nanocomposites
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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