Sintering of α-Al2O3-seeded nanocrystalline γ-Al2O3 powders

C. Scott Nordahl, Gary L. Messing

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

This paper demonstrates that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics. By using α-Al2O3 concentrations of ≥ 1.25 wt.% α-Al2O3 seed particles (equivalent to 5 × 1014 seeds/cm3 of γ-Al2O3) the sintering temperature is reduced from 1600°C for unseeded γ-Al2O3 to 1300-1400°C in dry pressed powders. The scale of the sintered microstructure is related to Nv-1/3 and thus a 100-nm grain size is obtained. It is apparent that seeding is necessary for producing dense, alumina-based ceramics from nanocrystalline transition alumina powders.

Original languageEnglish (US)
Pages (from-to)415-422
Number of pages8
JournalJournal of the European Ceramic Society
Volume22
Issue number4
DOIs
StatePublished - Apr 1 2002

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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