Show simple item record

dc.creatorObradović, Nina
dc.creatorFahrenholtz, William G.
dc.creatorFilipović, Suzana
dc.creatorKosanović, Darko
dc.creatorDapčević, A.
dc.creatorĐorđević, Antonije
dc.creatorBalać, Igor
dc.creatorPavlović, Vladimir B.
dc.date.accessioned2019-04-01T12:01:58Z
dc.date.available2021-03-16
dc.date.issued2019
dc.identifier.isbn0272-8842
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0272884219306340
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/5272
dc.description.abstractMagnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
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)/45007/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45019/RS//
dc.rightsembargoedAccess
dc.sourceCeramics International
dc.subjectelectrical properties
dc.subjectmechanical activation
dc.subjectmechanical properties
dc.subjectmicrostructure
dc.subjectsintering
dc.subjectspinel
dc.titleThe effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
dc.typearticleen
dc.rights.licenseBY-NC-ND
dcterms.abstractЂорђевић, Aнтоније; Обрадовић, Нина; Филиповић, Сузана; Косановић, Дарко; Фахренхолтз, W. Г.; Дапчевић, A.; Балаћ, Игор; Павловић, Владимир Б.;
dc.citation.spage12015
dc.citation.epage12021
dc.citation.volume45
dc.citation.issue9
dc.identifier.wos000466253500111
dc.identifier.doi10.1016/j.ceramint.2019.03.095
dc.identifier.scopus2-s2.0-85062915610
dc.description.otherThis is the peer-reviewed version of the article: Obradović, Nina, W. G. Fahrenholtz, Suzana Filipović, Darko Kosanović, A. Dapčević, Antonije Đorđević, Igor Balać, and Vladimir B. Pavlović. 2019. “The Effect of Mechanical Activation on Synthesis and Properties of MgAl2O4 Ceramics.” Ceramics International, [https://doi.org/10.1016/j.ceramint.2019.03.095]
dc.type.versionacceptedVersion


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record