Effect of dry-grinding and addition of seed on or-alumina formation from gibbsite

Kozo Yokota, Shu Saeki, Junya Kano, Fumio Saito

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1 Citation (Scopus)


Effect on α-alumina formation from gibbsite powder by heating was investigated for dry-grinding of gibbsite powder and the gibbsite powder added ̧-alumina fine powder as a seed. Two powder samples were prepared so as to adjust α-alumina formation temperature to nearly the same temperature at 1100°C. The transformation of intermediate alumina to α-alumina in the ground sample proceeded more homogeneous than that in the seeded sample. The particle size distribution of α-alumina powder calcined from the ground sample become narrower than that from the seeded sample, leading to the formation of sintered body with homogeneous grain size. This may be due to both the formation of much more fine α-alumina particles as nuclei of transformation and to a good dispersion in the intermediate alumina powder by the grinding in comparison with seeding.

Original languageEnglish
Pages (from-to)769-771
Number of pages3
JournalJournal of the Ceramic Society of Japan
Issue number8
Publication statusPublished - 1999


  • Dry-grinding
  • Gibbsite
  • Phase transformation
  • Powder property
  • Seeding
  • Sintering behavior
  • α-alumina


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