Texture development and microstructure evolution in liquid-phase-sintered α-alumina ceramics prepared by templated grain growth

Matthew M. Seabaugh, Gary L. Messing, Mark D. Vaudin

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Abstract

Texture development in alumina that contains calcia and silica and has been templated with platelet-shaped α-Al2O3 particles has been evaluated. The texture fraction is shown to be related directly to template growth. Texture quality is controlled by the template concentration, decreasing at template concentrations of > 10%, as a result of template-template interactions during tape casting. Almost fully textured alumina has been obtained at template concentrations of ≥20%. The growth of template grains is much more rapid in the radial direction and is shown to be inversely related to the thickness of the grain-boundary liquid. The activation energy for growth (376 kJ/mol) and the inverse relation with the grain-boundary thickness indicate that template growth in the radial direction is controlled by Al3+ diffusion.

Original languageEnglish (US)
Pages (from-to)3109-3116
Number of pages8
JournalJournal of the American Ceramic Society
Volume83
Issue number12
DOIs
StatePublished - Jan 1 2000

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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