Synthesis of bulk nanocrystalline HfB2 from HfCl4-NaBH4-Mg ternary system

Basit Öğe Kaydı
dc.authorid0000-0002-8638-3756en_US
dc.contributor.authorAkçamlı, Nazlı
dc.contributor.authorAgaogullari, Duygu
dc.contributor.authorBalci, Ozge
dc.contributor.authorOvecoglu, M. Lutfi
dc.contributor.authorDuman, Ismail
dc.date.accessioned2021-03-20T20:13:39Z
dc.date.available2021-03-20T20:13:39Z
dc.date.issued2017
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümüen_US
dc.description.abstractThis study reports on the synthesis and consolidation of pure HfB2 powders starting from HfCl4-NaBH4-Mg blends via autoclave processing, annealing and purification followed by pressureless sintering (PS, with 2 wt% Co aid) or spark plasma sintering (SPS). During autoclave reactions conducted at 500 A degrees C for 12 h under autogenic pressure, excess amounts of NaBH4 were utilized to investigate its effects on the reaction products and mechanism. A subsequent washing (with distilled water), annealing (at 750, 1000 and 1700 A degrees C) and acid leaching (HCl) were applied on the as-synthesized products. Pure HfB2 powders with an average particle size of 145 nm were obtained after autoclave synthesis in the presence of 200 wt% excess NaBH4, washing, annealing at 1000 A degrees C for 3 h and 6 M HCl leaching. SPS sample has higher relative density and microhardness values (94.18% and 20.99 GPa, respectively) than those of PS sample (90.14% and 14.85 GPa). Relative wear resistance was improved considerably (8.2 times) by employing SPS technique.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 appreciations to Prof. Dr. Servet Turan for his help with the SPS experiments and Prof. Dr. Huseyin Cimenoglu and M. Sc. Faiz Muhaffel for their supports in wear tests.en_US
dc.identifier.doi10.1007/s10853-017-1382-1en_US
dc.identifier.endpage12705en_US
dc.identifier.issn0022-2461
dc.identifier.issn1573-4803
dc.identifier.issue21en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage12689en_US
dc.identifier.urihttp://doi.org/10.1007/s10853-017-1382-1
dc.identifier.urihttps://hdl.handle.net/20.500.12885/914
dc.identifier.volume52en_US
dc.identifier.wosWOS:000407613800010en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkçamlı, Nazlı
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal Of Materials Scienceen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subject[No Keywords]en_US
dc.titleSynthesis of bulk nanocrystalline HfB2 from HfCl4-NaBH4-Mg ternary systemen_US
dc.typeArticleen_US

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Metalurji ve Malzeme Mühendisliği Bölümü Yayın Koleksiyonu
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