Submicrometer Transparent Alumina by Sinter Forging Seeded γ‐Al2O3 Powders

Oh‐Hun ‐H Kwon, C. Scott Nordahl, Gary L. Messing

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46 Scopus citations


Seeding boehmite with α‐Al2O2, followed by calcination at 600°C, results in an agglomerated alumina powder (<53 μm) that can be sinter forged to full density at 1250°C. Compressive strains as high as ɛx=−0.9, and radial flow (ɛx= 1.0) during sinter forging remove large, interagglomerate pores. The fully dense alumina has a grain size of 0.4 pm and is visually transparent. It is proposed that deformation of dense agglomerates is the primary mecha‐ nism responsible for large pore elimination and compact densification. The sinter forging of sol‐gel‐derived alumina powders offers a new technology to prepare highly transparent, optical ceramics at lower temperatures than conventional routes.

Original languageEnglish (US)
Pages (from-to)491-589
Number of pages99
JournalJournal of the American Ceramic Society
Issue number2
StatePublished - Feb 1995

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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