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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/5594

    Título
    High-entropy transition metal diborides by reactive and non-reactive spark plasma sintering: A comparative investigation
    Autor
    Tallarita, Giovanna
    Licheri, Roberta
    Garroni, SebastianoAutoridad UBU Orcid
    Barbarossa, Simone
    Orrù, Roberto
    Cao, Giacomo
    Publicado en
    Journal of the European Ceramic Society. 2020, V. 40, n. 4, p. 942-952
    Editorial
    Elsevier
    Fecha de publicación
    2020-04
    ISSN
    0955-2219
    DOI
    10.1016/j.jeurceramsoc.2019.10.031
    Resumen
    The direct synthesis and consolidation by SPS (1950 °C, 20 min, 20 MPa) of high-entropy (Hf0.2Mo0.2Zr0.2Nb0.2Ti0.2)B2 from elemental powders resulted in a multiphase product. An increase of the heating rate determined a change of the mechanism governing the synthesis reaction from gradual solid-state diffusion to rapid combustion regime, while the final conversion degree was 67 wt.%. The sintered product displayed a non-uniform microstructure with the presence of 10–15 μm sized pores, due to volatilization phenomena occurring during the combustion synthesis reaction. In contrast, when the SPS process was preceded by powder synthesis via SHS, a homogeneous single-phase ceramic was obtained. Clear benefits are derived by the use of SHS, able to provide very shortly powders with elemental species very well intermixed, so that the obtainment of (Hf0.2Mo0.2Zr0.2Nb0.2Ti0.2)B2 during the subsequent SPS stage is strongly promoted. The resulting 92.5% dense product shows superior oxidation resistance with respect to individual borides prepared with the same method.
    Palabras clave
    High-entropy ceramics
    Borides
    Spark plasma sintering
    Self-propagating high-temperature synthesis
    Resistance to oxidation
    Materia
    Materiales
    Materials
    URI
    http://hdl.handle.net/10259/5594
    Versión del editor
    https://doi.org/10.1016/j.jeurceramsoc.2019.10.031
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    Attribution-NonCommercial-NoDerivatives 4.0 Internacional
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    Tallarita-jecs_2020.pdf
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