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dc.creatorTerzić, Anja
dc.creatorAndrić, Ljubiša
dc.creatorMitić, Vojislav V.
dc.date.accessioned2017-06-10T15:45:07Z
dc.date.issued2014
dc.identifier.issn0272-8842
dc.identifier.urihttps://dais.sanu.ac.rs/123456789/666
dc.description.abstractIn this study, the feasibility of alumina phase transition enhancement by mechanical activation was conducted. It was showed that the milling environment plays an important role on the physical, chemical and thermal behavior of the alumina powder utilized as refractory component material. The aim of the investigation was to increase the reactivity of the starting γ-Al2O3 by mechanical treatment in two types of high-energy activators – vibratory disc mill and vibratory ball mill. In continuation, the decrease of the subsequent sintering temperature as well as the treatment duration would be induced by making the transition into final thermo-stable α-Al2O3 modification easier and faster. Full factorial experiment was conducted and the results were analyzed by the proposed mathematical model in order to understand the effects of the activation process variables on the amount and physical characteristics of the synthesized (activated and subsequently thermally treated) product and to establish the optimal activation period. As the result of the analysis, operation parameters of the activator and activation period were found to be the most important factors. The initial γ-Al2O3 and synthesized α-Al2O3 were thoroughly analyzed by DTA, XRD, IR and SEM methods. Thermal behavior of γ and α-modification were studied by differential thermal analysis conducted in the same environment, under same heating rates. X-ray diffraction analysis gave reliable identification of the crystal phases and changes in crystallinity of treated alumina. Based on XRD peak intensity measurements, the γ-Al2O3 almost completely passed (95%) into α-Al2O3 after 180 min of activation in vibratory ball mill and subsequent thermal treatment (2 h/1200 °C). SEM microphotographs with accompanying image analysis PC program highlighted changes in size and shape of particles of initial and synthesized Al2O3. Synthesized Al2O3 exquisite thermal behavior characteristic for refractory compounds, demonstrated that it is possible to obtain α-alumina at lower transformation temperatures in shorter time intervals by applying mechanical activation.en
dc.format40 8, Part B (2014) 14851-14863
dc.languageen
dc.publisherElsevier
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172057/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45008/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/34006/RS//
dc.rightsrestrictedAccess
dc.sourceCeramics Internationalen
dc.subjectsintering
dc.subjectmechanical activation
dc.subjectvibratory mill
dc.subjectsynthesized Al2O3
dc.subjectrefractory materials
dc.titleAssessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanismen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractМитић, Војислав В.; Терзић, Aња; Aндрић, Љубиша;
dc.citation.spage14851
dc.citation.epage14863
dc.citation.volume40
dc.citation.issue8 Part B
dc.identifier.wos000341343300039
dc.identifier.doi10.1016/j.ceramint.2014.06.080
dc.identifier.scopus2-s2.0-84905902298
dc.type.versionpublishedVersion
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_dais_666


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