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Descripción
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| Ceramic rods of Al2O3-Y3Al5O12-YSZ (Y2O3-doped ZrO2) with a bending strength of 4.6 GPa and high fracture toughness perpendicular to the rod axis were manufactured by directional solidification from the melt at high growth rates in an inert atmosphere using the laser-heated floating zone method. Under conditions of cooperative growth, the ternary eutectic presented a homogeneous microstructure, formed by bundles of single-crystal c-oriented Al2O3 and Y3Al5O12 whiskers of ≈ 100 nm in width with smaller YSZ whiskers between them. The interfaces were free from amorphous phases and very strong, being able to withstand the extremely high thermo-elastic residual stresses generated upon cooling. The outstanding strength of the ternary eutectics was explained in terms of the synergistic effect of the microstructure refinement provided by the high growth rates, and the toughening induced by crack deflection along the nanofibrills due to the anisotropy in the fracture toughness of sapphire and to the thermal residual stresses. | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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ADV MATER |
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ISSN
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0935-9648 |
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Factor de impacto JCR
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8,191 |
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Información de impacto
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Volumen
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19 |
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DOI
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Número de revista
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17 |
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2313 |
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