Room-Temperature Mechanochemical Synthesis and Consolidation of Nanocrystalline HfB2-HfO2 Composite Powders

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dc.authorid0000-0002-8638-3756en_US
dc.contributor.authorAkçamlı, Nazlı
dc.contributor.authorAgaogullari, D.
dc.contributor.authorBalci, O.
dc.contributor.authorOvecoglu, M. L.
dc.contributor.authorDuman, I
dc.date.accessioned2021-03-20T20:13:14Z
dc.date.available2021-03-20T20:13:14Z
dc.date.issued2018
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümüen_US
dc.description.abstractThis study reports on the in-situ preparation of HfB2-HfO2 composite powders at room temperature by means of mechanochemical synthesis (MCS) from HfCl4-B2O3-Mg powder blends. The effects of milling duration and excess amounts of B(2)O3 and Mg reactants (20 and 30 wt%) on the HfB2 formation mechanism were investigated. After MCS and purification, HfB2, HfO2 and Mg2Hf5O12 phases were obtained. The Mg2Hf5O12 phase decomposed during the annealing treatment conducted at 1000 degrees C under Ar flow. The as-synthesized, purified, annealed and subsequently leached powders were characterized with an X-ray diffractometer (XRD), stereomicroscope (SM), scanning electron microscope (SEM), transmission electron microscope (TEM) and particle size analyzer (PSA). The HfB2-Hf-O2 composite powders with an average particle size of 140 nm and predominantly rounded morphology were consolidated with cold pressing/pressureless sintering (PS) and spark plasma sintering (SPS) techniques. The relative density values of the HfB2-Hf-O2 composites obtained by means of PS (with 2 wt% Co) and SPS techniques were 91.82 % and 93.79 %, respectively. A relatively high densification rate for the HfB2-Hf(O2 )ceramic was achieved by means of Co addition, which was considered a promising sintering aid for HfB2-based ceramics. The HfB2-HfO2 composite sample consolidated with SPS exhibited hardness, wear volume loss amount and friction coefficient values of 18.45 GPa, 4.30 mm(3) and 0.60, respectively.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [112M470]; Istanbul Technical University Scientific Research ProjectsIstanbul Technical University [37544]en_US
dc.description.sponsorshipThis study was financially supported by "The Scientific and Technological Research Council of Turkey (TUBITAK)" with the project number of 112M470 and by "Istanbul Technical University Scientific Research Projects" with the project number of 37544. The authors also wish to express their appreciation to Prof. Dr Servet Turan for his help with the SPS experiments and Prof. Dr Huseyin Cimenoglu and M.Sc. Faiz Muhaffel for their support in the wear tests.en_US
dc.identifier.doi10.4416/JCST2017-00084en_US
dc.identifier.endpage118en_US
dc.identifier.issn2190-9385
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ4en_US
dc.identifier.startpage101en_US
dc.identifier.urihttp://doi.org/10.4416/JCST2017-00084
dc.identifier.urihttps://hdl.handle.net/20.500.12885/822
dc.identifier.volume9en_US
dc.identifier.wosWOS:000437758800001en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkçamlı, Nazlı
dc.language.isoenen_US
dc.publisherGoller Verlag Gmbhen_US
dc.relation.ispartofJournal Of Ceramic Science And Technologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectHfB2-HfO2 compositesen_US
dc.subjectpowdersen_US
dc.subjectsolid state reactionen_US
dc.subjectsinteringen_US
dc.subjectmicrostructure-finalen_US
dc.subjectmechanical propertiesen_US
dc.titleRoom-Temperature Mechanochemical Synthesis and Consolidation of Nanocrystalline HfB2-HfO2 Composite Powdersen_US
dc.typeArticleen_US

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