Grain boundaries in titania-doped α-alumina with anisotropic microstructure

Anteneh Kebbede, Gary L. Messing, Altaf H. Carim

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34 Scopus citations

Abstract

The microstructure of sol-gel-derived α-alumina (Al2O3) doped with 0.6 wt% titania, sintered at 1450°C for 1 h, consisted of thin platelets with (0001) faces in a matrix of equiaxed grains. Short facets at the edges of the platelets developed primarily parallel to the {1012} planes, while some were parallel to the {1123} planes; other edges showed irregular, curved boundaries. The basal surfaces of the platelets were coated with thin layers (0.5-6 nm) of an amorphous titanium-containing aluminosilicate phase, which also was present at triple points. No amorphous phase was found on the short faceted boundaries, on curved boundaries at platelet edges, or at grain boundaries of equiaxed, matrix grains. However, titanium enrichment was observed at all examined boundaries, suggesting that titanium segregation alone did not account for the development of anisotropic microstructure. Curved incursions on basal facets were associated with occasional particles of aluminum titanate (Al2TiO5).

Original languageEnglish (US)
Pages (from-to)2814-2820
Number of pages7
JournalJournal of the American Ceramic Society
Volume80
Issue number11
DOIs
StatePublished - Nov 1997

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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