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dc.contributor.authorTallarita, Giovanna
dc.contributor.authorLicheri, Roberta
dc.contributor.authorGarroni, Sebastiano 
dc.contributor.authorBarbarossa, Simone
dc.contributor.authorOrrù, Roberto
dc.contributor.authorCao, Giacomo
dc.date.accessioned2021-01-13T11:25:12Z
dc.date.available2021-01-13T11:25:12Z
dc.date.issued2020-04
dc.identifier.issn0955-2219
dc.identifier.urihttp://hdl.handle.net/10259/5594
dc.description.abstractThe 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.en
dc.description.sponsorshipARCHIMEDES project sponsored by Regione Autonoma della Sardegna (Italy) - Fondo di Sviluppo e Coesione (FSC) 2014-2020 (Cod. RAS: RASSR88309, Cod. CUP: F76C18000980002). One of the authors (G.T.) performed her activity in the framework of the International PhD in Innovation Sciences and Technologies at the University of Cagliari, Italy. One of us (G.C.) acknowledges the results obtained in this manuscript as quite important for the “Ithermal” and “Generazione E” projects, sponsored by Sardegna Ricerche, Italy (Cod. CUP: F21I18000130006) and by the Italian Ministry of Education, University and Research, Italy (Cod. CUP: B96G18000560005), respectivelyes
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherElsevieres
dc.relation.ispartofJournal of the European Ceramic Society. 2020, V. 40, n. 4, p. 942-952es
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectHigh-entropy ceramicsen
dc.subjectBoridesen
dc.subjectSpark plasma sinteringen
dc.subjectSelf-propagating high-temperature synthesisen
dc.subjectResistance to oxidationen
dc.subject.otherMaterialeses
dc.subject.otherMaterialsen
dc.titleHigh-entropy transition metal diborides by reactive and non-reactive spark plasma sintering: A comparative investigationen
dc.typeinfo:eu-repo/semantics/article
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.relation.publisherversionhttps://doi.org/10.1016/j.jeurceramsoc.2019.10.031es
dc.identifier.doi10.1016/j.jeurceramsoc.2019.10.031
dc.journal.titleJournal of the European Ceramic Societyes
dc.volume.number40es
dc.issue.number4es
dc.page.initial942es
dc.page.final952es
dc.type.hasVersioninfo:eu-repo/semantics/acceptedVersion


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