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

Abstract:

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.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 1377-1384
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.1377
• Online since: October 2006
• Authors: Léo Mazerolles, N. Piquet, M.F. Trichet, Michel Parlier
• Keywords: Directional Solidification, Electron Microscopy, Eutectic, Interface, Refractory Oxides

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