Sintering and crystallization of mullite in diphasic gels

L. Pach, A. Iratni, Z. Hrabe, S. Svetík, S. Komarneni

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Abstract

Diphasic monolithic mullite gel of stoichiometric composition shows a multiple aggregation of colloidal SiO2 (∼ 12 nm) and AlOOH (∼10 nm) particles. The identity of the colloidal particles is retained up to the crystallization of mullite at a temperature of 1240°C in unpressed or 1220°C in gels cold-isostatically pressed at 1.5 GPa. Intensive sintering is closely followed by crystallization of mullite. Both sintering and crystallization are apparently related with the formation of a silica continuum. Nucleation of mullite appears to occur at points of contact (interface) of SiO2/δ-Al2O3 particles.

Original languageEnglish (US)
Pages (from-to)5490-5494
Number of pages5
JournalJournal of Materials Science
Volume30
Issue number21
DOIs
StatePublished - Jan 1 1995

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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