Sintering and grain growth in nanocrystalline ceramics

R. S. Averback, H. J. Höfler, H. Hahn, J. C. Logas

Research output: Contribution to journalArticlepeer-review


Nanocrystalline ceramics have been produced by the method of inert gas condensation of ultra-small particles and in situ compaction. Sintering and grain growth characteristics have been investigated by a variety of techniques, including: X-ray diffraction, gravimetry, BET, scanning electron microscopy and small-angle neutron scattering. It was observed that the green body densities of these materials vary greatly with compaction pressure and temperature. Densities > 90% bulk density could be achieved without grain growth in TiO2 using pressure assisted sintering at ≈ 500°C. Grain growth studies showed that the grain size varied as t 1 3. Moreover, the grain growth in dense materials was greatly accelerated compared to that in less dense material suggesting pore stabilization of grain size. Grain size could be partially stabilized by suitable doping or by pressure-assisted sintering. Correlations of grain size to various mechanical properties will be presented.

Original languageEnglish (US)
Pages (from-to)173-178
Number of pages6
JournalNanostructured Materials
Issue number2
StatePublished - 1992

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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