Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Ultra-High Strength Nanofibrillar Al2O3-YAG-YSZ Eutectics.
Year:2007
Research Areas
  • Materials
Information
Abstract
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.
International
Si
JCR
Si
Title
ADV MATER
ISBN
0935-9648
Impact factor JCR
8,191
Impact info
Volume
19
Journal number
17
From page
2313
To page
2318
Month
SEPTIEMBRE
Ranking
Participants
  • Autor: A. Larrea
  • autor: P.B. Oliete
  • Autor: Fco. Javier Llorca Martinez (UPM)
  • Autor: Antonia Martin Sanz (UPM)
  • Autor: V.M. Orera
  • Autor: Javier Segurado Escudero (UPM)
  • Autor: J.I. Peña
  • Autor: Jose Ignacio Pastor Caño (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Materiales Estructurales avanzados y nanomateriales
  • Departamento: Ingeniería Civil: Construcción
  • Departamento: Ciencia de los Materiales
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
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