Anisotropic grain growth in boria-doped diphasic mullite gels

Seong Hyeon Hong, Gary L. Messing

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ~1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation Gn-Gon=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660kJ mol-1 for elongation and 800 kJ mol-1 for thickening.

Original languageEnglish (US)
Pages (from-to)521-526
Number of pages6
JournalJournal of the European Ceramic Society
Issue number4
StatePublished - Apr 1999

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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