Dense, high quality textured alumina was fabricated by templated grain with only 0.14wt% (SiO2+CaO) and 1-15wt% tabular alumina templates From stereological measurements, texture fraction was 95% and unaffected by template loading or dopant concentration. Due to the excellent template alignment during casting, the full-width at half the maximum (FWHM) of the rocking curve was exceptionally low at 4.6°. Samples with the largest templated grains (1% templated alumina) have much lower strength (300-320MPa) than those with smaller templated grains (400-500MPa). Predominantly transgranular crack paths were observed in fracture surfaces both parallel and perpendicular to the oriented grains. The fracture toughness was anisotropic with slightly higher toughness perpendicular to the basal surface than parallel the direction grain basal surface. Surprisingly, the lowest density sample (93%) tested, which started with 15wt% templates had the highest strength of 511MPa±0.45 and highest fracture toughness of 4.58±0.44MPam1/2 when measured perpendicular to the basal surface of the grains.
|Original language||English (US)|
|Number of pages||9|
|Journal||Journal of the European Ceramic Society|
|State||Published - Oct 1 2010|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry