Lowering Crystallization Temperatures by Seeding in Structurally Diphasic Al2O3‐MgO Xerogels

Yoshiko Suwa, Rustum Roy, Sridhar Komarneni

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Thermal reactions in 93% Al2O3‐7% MgO and 95.8% Al2O3‐4.2% MgO gels seeded with α‐Al2O3, MgAl2O4, α‐Fe2O3, and SiO2, sols were investigated by differential thermal analysis to determine the extent of nucleation catalysis of solid‐state reactions. Seeding with α‐Al2O3 lowered the α‐Al2O3 crystallization temperature in these xerogels by 100° to 150°C. Spinel seeds have much less effect on the γ‐α transition, and α‐Fe2O3 and SiO2 seeds do not affect it significantly. Isostructural seeding of gels may therefore permit lower ceramic processing temperatures.

Original languageEnglish (US)
Pages (from-to)C‐238-C‐240
JournalJournal of the American Ceramic Society
Volume68
Issue number9
DOIs
StatePublished - Sep 1985

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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