Anisotropic Grain Growth in Seeded and B2O3-doped Diphasic Mullite Gels

S. H. Hong, W. Cermignani, G. L. Messing

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Abstract

Anisotropic grain growth in mullite was investigated in B2O3-doped diphasic gels seeded with either mullite particles or whiskers. Anisotropic grain growth was observed in all systems. The largest anisotropic grains were obtained with a system seeded with 2 wt% mullite whiskers and doped with 2 wt% B2O3. The mullite whiskers act as sites for multiple nucleation and subsequently as templates for mullite overgrowth. Boria lowered the mullite formation temperature by 150° C and it significantly enhanced anisotropic grain growth independent of the presence of seed particles. This enhancement was attributed to increased dissolution of alumina.

Original languageEnglish (US)
Pages (from-to)133-141
Number of pages9
JournalJournal of the European Ceramic Society
Volume16
Issue number2 SPEC. ISS.
DOIs
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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