Investigation of the intra-particle sintering kinetics of a mainly agglomerated alumina powder by using surface area reduction

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dc.contributor.authorAda, K.
dc.contributor.authorÖnal, M.
dc.contributor.authorSarıkaya, Y.
dc.date.accessioned2020-06-25T17:41:24Z
dc.date.available2020-06-25T17:41:24Z
dc.date.issued2006
dc.descriptionOnal, Muserref/0000-0002-1540-8389
dc.description.abstractAn alumina precursor was prepared by the aluminium sulphate (0.20 M) and excess urea reaction in boiling aqueous solution. The precursor was calcined at 900 degrees C for 2 h and then delta-Al2O3 Powder having volumetric agglomeration degree of 80% was obtained. Cylindrical compacts having diameter of 14 mm were prepared under 32 MPa by axial pressing using oleic acid as binder. Each compact was fired isothermally at various temperatures between 950 and 1400 degrees C. The firing time was changed from zero to 2 h. The fired compacts were examined by scanning electron microscopy (SEM) and nitrogen adsorption techniques. The specific surface areas (S/m(2) g(-1)) of the samples were calculated using the Brunauer, Emmett, and Teller (BET) procedure. The rate constant (k) and mechanism-characteristic parameter (n) were obtained for different temperatures between 950 degrees C and 1150 degrees C from the application of the neck-growth sintering rate (NGRM) model on the surface area reduction data. An Arrhenius equation and the parameter n for the sintering were found in the forms of k = (7.648 x 106 h(-1)) exp (-186,234 J mol(-1)/RT) and n = 4.0 x 10(-7) T-3 - 1.7 x 10(-3) T-2 + 2.3 T- 1030.8 respectively. The parameter n changes in the interval 0.61 < n < 1.34 with rising temperature having maximum at about 1025 degrees C. Based on the SEM images and NGRM data, the intra-particle sintering was discussed. (c) 2006 Elsevier B.V. All rights reserved.en_US
dc.identifier.citationclosedAccessen_US
dc.identifier.doi10.1016/j.powtec.2006.07.004
dc.identifier.endpage41en_US
dc.identifier.issn0032-5910
dc.identifier.issn1873-328X
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-33748523836
dc.identifier.scopusqualityQ1
dc.identifier.startpage37en_US
dc.identifier.urihttps://doi.org10.1016/j.powtec.2006.07.004
dc.identifier.urihttps://hdl.handle.net/20.500.12587/3702
dc.identifier.volume168en_US
dc.identifier.wosWOS:000241204700005
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevieren_US
dc.relation.ispartofPowder Technology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectagglomerationen_US
dc.subjectaluminaen_US
dc.subjectsintering kineticsen_US
dc.subjectsurface areaen_US
dc.titleInvestigation of the intra-particle sintering kinetics of a mainly agglomerated alumina powder by using surface area reductionen_US
dc.typeArticle

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