Production of Si3N4 porous beads via carbothermal reduction and nitridation technique

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dc.authorid0000-0001-7515-5427en_US
dc.contributor.authorTopates, Gulsum
dc.contributor.authorKalemtaş, Ayşe
dc.date.accessioned2021-03-20T20:09:18Z
dc.date.available2021-03-20T20:09:18Z
dc.date.issued2020
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümüen_US
dc.description.abstractSi(3)N(4)porous beads were produced from direct carbothermal reduction and nitridation of spheres composed of carbon+SiO(2)mixtures. A simple one-step sol-gel templating technique was used to prepare carbon+SiO2(molar ratio of carbon/SiO(2)was set as 4) containing spheres with a diameter of 2 mm. A natural and abundant biopolymer, alginate, is used as a sacrificial template to produce porous Si(3)N(4)ceramic beads. Carbothermal reduction and nitridation process was conducted at two different temperatures (1500 and 1550 degrees C) and atmospheres (pure nitrogen and 5% hydrogen in nitrogen) to observe the effect of process parameters on the yield of Si3N4. Porous beads with a smooth shape and without any deformation were successfully obtained after the carbothermal reduction and nitridation process. X-ray powder diffraction studies showed that the use of H(2)increased the amount of Si(3)N(4)formed by accelerating the reduction and nitridation reactions. Microstructural investigations revealed oxide addition changed grain morphology from fiber-like to short, angular geometry. This microstructural development showed that the addition of oxide powder increased the amount of liquid phase formed during the heat treatment process and changed carbothermal reduction and nitridation mechanism from vapor-solid to vapor-liquid solid.en_US
dc.identifier.doi10.1080/21870764.2020.1833415en_US
dc.identifier.endpage1205en_US
dc.identifier.issn2187-0764
dc.identifier.issue4en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage1197en_US
dc.identifier.urihttp://doi.org/10.1080/21870764.2020.1833415
dc.identifier.urihttps://hdl.handle.net/20.500.12885/355
dc.identifier.volume8en_US
dc.identifier.wosWOS:000578070500001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorKalemtaş, Ayşe
dc.language.isoenen_US
dc.publisherTaylor & Francis Ltden_US
dc.relation.ispartofJournal Of Asian Ceramic Societiesen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSol-gel templatingen_US
dc.subjectcarbothermal reduction-nitridationen_US
dc.subjectporous Si3N4 beadsen_US
dc.titleProduction of Si3N4 porous beads via carbothermal reduction and nitridation techniqueen_US
dc.typeArticleen_US

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