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Elaboration and mechanical characterization of multi-phase alumina-based ultra-fine composites

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Abstract

Al2O3-10 vol.% YAG and Al2O3-10 vol.% ZrO2 bi-phase composites as well as Al2O3-5 vol.% YAG-5 vol.% ZrO2 tri-phase composite were developed by controlled surface modification of an alumina powder with inorganic precursors of the second phases. Green bodies were produced by dry pressing and slip casting and then sintered at 1500 °C. In particular, slip casting led to fully dense, defect-free, and highly homogenous samples, made of a fine dispersion of the second phases into the micronic alumina matrix, as observed by SEM. The mechanical characterization proved the predominant role of the final density on the Vickers hardness, while the elastic modulus was affected by the volume fraction of the constituent phases, in fairly good agreement with the rule of mixture prediction. The fracture toughness values of the bi- and tri-phase materials were similar, and their crack paths revealed the importance of the thermal residual stresses at the matrix-reinforcement interfaces, promoting inter-granular propagations.

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Acknowledgements

Eng. Andrea Cattini is kindly acknowledged for his contribution in the experimental activity.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Chimica E Scienza Dei Materiali, Politecnico di Torino, INSTM, R.U. PoliTO, LINCE Lab, Corso Duca degli Abruzzi 24, 10129, Turin, Italy

    Paola Palmero, Valentina Naglieri & Mariangela Lombardi

  2. Dipartimento di Ingegneria Dei Materiali E Dell’Ambiente, Università di Modena E Reggio Emilia, INSTM, R.U. UniMORE, LINCE Lab, Via Vignolese 905, 41125, Modena, Italy

    Antonella Sola, Devis Bellucci & Valeria Cannillo

Authors
  1. Paola Palmero
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  2. Antonella Sola
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  3. Valentina Naglieri
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  4. Devis Bellucci
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  5. Mariangela Lombardi
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  6. Valeria Cannillo
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Correspondence to Paola Palmero.

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Palmero, P., Sola, A., Naglieri, V. et al. Elaboration and mechanical characterization of multi-phase alumina-based ultra-fine composites. J Mater Sci 47, 1077–1084 (2012). https://doi.org/10.1007/s10853-011-5898-5

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  • DOI: https://doi.org/10.1007/s10853-011-5898-5

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