Transformation and Microstructure Control in Boehmite‐Derived Alumina by Ferric Oxide Seeding


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Single‐crystal seed particles of α‐Fe2O3 were produced by aging ferric nitrate‐derived precipitates. Addition of these particles to boehmite (γ‐AlOOH) sols at concentrations up to 1014 particles/cm3 of dried gel (4.2 wt%) reduced the θ‐ to α‐Al2O3 transformation temperature from 1215° to 1085°C as measured by DTA at a heating rate of 10°/min. The addition of Fe(NO3)3 solution to boehmite at an equivalent Fe2O3 concentration of up to 8.1 wt% lowered the transformation temperature to <970°C. The increased nucleation frequency afforded by Fe2O3 particle and salt additions permitted the development of fully dense submicrometer α‐Al2O3 at <1250°C. Transformation control in alumina is discussed in terms of nucleation frequency and epitaxial effects. 1988 The American Ceramic Society

Original languageEnglish (US)
Pages (from-to)387-392
Number of pages6
JournalAdvanced Ceramic Materials
Issue number4
StatePublished - Jul 1988

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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