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Structural evolution of a Al2O3-MgOxAl2O3 castable in the range 1000-1600ºC

dc.creatorBenavidez, Edgardo
dc.creatorBrandaleze, Elena
dc.date.accessioned2022-12-28T14:49:05Z
dc.date.available2022-12-28T14:49:05Z
dc.date.issued2022-07-28
dc.identifier.urihttps://ceramics.org/event/pan-american-ceramics-congress-and-ferroelectrics-meeting-of-americas-pacc-fmas-2022-archive
dc.identifier.urihttp://hdl.handle.net/20.500.12272/7462
dc.description.abstractThermal and structural characteristics of an alumina-spinel castable (containing 2.5 wt.% CaO) was studied. The specimens were cast (8.0 wt.% water), cured in air at ambient temperature (48 h), then dried at 100°C (24 h) and prefiring at 500°C (3 h). Thermal behavior was analyzed by dilatometries at constant heating rate (5°C/min) up to 1600°C, and at constant temperature (range: 1000-1500°C). Crystallographic phases were determined by XRD and microstructures were analyzed by SEM/EDS. Specimens heat treated at 1000°C and 1200°C showed Al2O3 (A) and MgAl2O4 (MA) as main phases. Between 1200-1300°C, the 2Al2O3CaO (CA2) formation is promoted. Calcium hexaluminate 6Al2O3CaO (CA6) is detected from 1400°C. The presence of CA6 increases at 1500°C and 1600°C. From dilatometric curve, in the range 1000-1600°C, expansion and shrinkage alternative zones were observed. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid assistance. Thus, considering the temperature profile, generated in service, through this material, both the formation of CA2 and CA6 and the sintering evolution during the first hours, lead to volumetric contractions and expansions in different zones. These volumetric changes generate mechanical stresses that can cause faults in the material.es_ES
dc.formatpdfes_ES
dc.language.isoenges_ES
dc.publisherThe American Ceramic Societyes_ES
dc.rightsopenAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.rights.uriAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.subjectSpineles_ES
dc.subjectAluminaes_ES
dc.subjectCastablees_ES
dc.subjectXRDes_ES
dc.subjectStructurees_ES
dc.titleStructural evolution of a Al2O3-MgOxAl2O3 castable in the range 1000-1600ºCes_ES
dc.titleStructural evolution of a Al2O3-MgOxAl2O3 castable in the range 1000-1600ºC
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.description.affiliationFil: Benavidez, Edgardo. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento Metalurgia. Centro DEYTEMA; Argentina.es_ES
dc.description.affiliationFil: Brandaleze, Elena. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento de Ingeniería Metalúrgica. Centro DEYTEMA; Argentina.es_ES
dc.type.versionpublisherVersiones_ES
dc.rights.useLicencia CC BY NC NDes_ES


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