Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1450145 | Acta Materialia | 2006 | 11 Pages |
Abstract
Hot-pressed alumina samples, with 5Â wt.% additions of CaO:SiO2 possessing molar ratios ranging between 1:5 and 10:1 were studied by electron microscopy. Marked differences in microstructure (e.g. grain size, secondary crystalline phases and grain boundary film thickness) were observed, which depended on the composition of sintering additives. The compositions of glassy phases in triple pockets and in grain boundaries varied markedly depending on sintering additives, but also within individual specimens. High residual compressive stresses were measured in alumina grains of samples which contained low thermal expansion crystalline phases such as anorthite and grossite, while gehlenite-containing samples were correspondingly less stressed.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Peter Å vanÄárek, DuÅ¡an Galusek, Fiona Loughran, Andy Brown, Rik Brydson, Alan Atkinson, Frank Riley,