Effects of different milling conditions on the properties of lanthanum hexaboride nanoparticles and their sintered bodies

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dc.authorid0000-0002-8638-3756en_US
dc.contributor.authorAgaogullari, Duygu
dc.contributor.authorBalci, Ozge
dc.contributor.authorAkçamlı, Nazlı
dc.contributor.authorDuman, Ismail
dc.contributor.authorOvecoglu, M. Lutfi
dc.date.accessioned2021-03-20T20:12:27Z
dc.date.available2021-03-20T20:12:27Z
dc.date.issued2019
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümüen_US
dc.description.abstractIn this study, the preparation and consolidation of nanocrystalline LaB6 powders originating from powder blends of La2O3, B2O3 and Mg were reported. A consecutive route of mechanochemical synthesis (MCS) and purification was utilized for the achievement of nano-sized LaB6 powders. As-synthesized powders were leached out from intermediate reaction products or impurities. Then, a sequential step of cold pressing (uniaxial pressure at 800 MPa) and pressureless sintering (at 1700 degrees C for 5 h under Ar gas flow) were utilized for the consolidation of the purified LaB6 powders. The type of mill (vibratory and planetary high-energy ball mills) was employed as a MCS parameter to reveal its effect on the physical, microstructural and mechanical properties of the LaB6 powders, and their bulk structures. Compositional, physical and microstructural properties of the products after powder processing were determined via X-ray diffractometer (XRD), particle size analyzer (PSA), differential scanning calorimeter (DSC), stereomicroscope (SM), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometer (EDS) coupled with both SEM and TEM, and vibrating sample magnetometer (VSM). The bulk properties of the LaB6 consolidated from nanocrystalline powders with a minimum 99.99% purity, and similar to 62 nm (for vibratory ball mill) or similar to 74 nm (for planetary ball mill) average particle size were compared according to various properties. LaB6 powders were synthesized in planetary mill at an approximately six times longer duration than that of in vibratory mill. According to the results, density, surface area and mean particle size values of the vibratory ball-milled samples (containing paramagnetic powders) are better than those of planetary ball-milled (containing diamagnetic powders) ones. However, mechanical properties such as hardness, surface roughness, wear rate, friction coefficient, and also electrical conductivity were improved in the planetary ball-milled LaB6 bulks.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK); Istanbul Technical UniversityIstanbul Technical University [109M364, 33549]en_US
dc.description.sponsorshipThis study was financed by "The Scientific and Technological Research Council of Turkey (TUBITAK)" and "Istanbul Technical University Scientific Research Projects" with the project numbers of 109M364 and 33549.en_US
dc.identifier.doi10.1016/j.ceramint.2019.06.034en_US
dc.identifier.endpage18246en_US
dc.identifier.issn0272-8842
dc.identifier.issn1873-3956
dc.identifier.issue15en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage18236en_US
dc.identifier.urihttp://doi.org/10.1016/j.ceramint.2019.06.034
dc.identifier.urihttps://hdl.handle.net/20.500.12885/566
dc.identifier.volume45en_US
dc.identifier.wosWOS:000483454200009en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkçamlı, Nazlı
dc.language.isoenen_US
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofCeramics Internationalen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectPowders: solid state reactionen_US
dc.subjectSinteringen_US
dc.subjectMicrostructure-finalen_US
dc.subjectMechanical propertiesen_US
dc.subjectBoridesen_US
dc.titleEffects of different milling conditions on the properties of lanthanum hexaboride nanoparticles and their sintered bodiesen_US
dc.typeArticleen_US

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