Microstructures and Interfaces in Melt-Growth Al2O3-Ln2O3 Based Eutectic Composites

Abstract:

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Directionally solidified oxide eutectic ceramics were prepared from Al2O3, Ln2O3 and ZrO2 based binary or ternary systems. Their microstructures consist of continuous networks of single-crystal Al2O3 and oxide compounds (LnAlO3, Ln3Al5O12) which interpenetrate without grain boundaries. The outstanding stability of these microstructures gives rise to a high strength and creep resistance at high temperature. Influence of growth conditions on the morphology of the as-obtained microstructures was studied. Preferred growth directions, orientation relationships between phases and single-crystal homogeneity of specimen were revealed. Low residual stresses were measured in the binary eutectics and fracture toughness at room temperature was improved by the addition of zirconia at a eutectic composition in ternary systems.

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Periodical:

Edited by:

P. VINCENZINI

Pages:

1377-1384

DOI:

10.4028/www.scientific.net/AST.45.1377

Citation:

L. Mazerolles et al., "Microstructures and Interfaces in Melt-Growth Al2O3-Ln2O3 Based Eutectic Composites", Advances in Science and Technology, Vol. 45, pp. 1377-1384, 2006

Online since:

October 2006

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$35.00

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