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

Thermal 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...

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Autores principales: Benavidez, Edgardo, Lagorio, Yamila
Formato: Documento de conferencia publisherVersion
Lenguaje:Inglés
Publicado: The American Ceramic Society 2022
Materias:
Spinel
Alumina
Castable
XRD
Structure
Acceso en línea:https://ceramics.org/event/pan-american-ceramics-congress-and-ferroelectrics-meeting-of-americas-pacc-fmas-2022-archive
http://hdl.handle.net/20.500.12272/7462
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-7462
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic Spinel
Alumina
Castable
XRD
Structure
spellingShingle Spinel
Alumina
Castable
XRD
Structure
Benavidez, Edgardo
Lagorio, Yamila
Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
topic_facet Spinel
Alumina
Castable
XRD
Structure
description Thermal 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.
format Documento de conferencia
publisherVersion
author Benavidez, Edgardo
Lagorio, Yamila
author_facet Benavidez, Edgardo
Lagorio, Yamila
author_sort Benavidez, Edgardo
title Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
title_short Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
title_full Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
title_fullStr Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
title_full_unstemmed Structural evolution in the range 1000-1600ºC of a Al2O3-MgOxAl2O3 castable
title_sort structural evolution in the range 1000-1600ºc of a al2o3-mgoxal2o3 castable
publisher The American Ceramic Society
publishDate 2022
url https://ceramics.org/event/pan-american-ceramics-congress-and-ferroelectrics-meeting-of-americas-pacc-fmas-2022-archive
http://hdl.handle.net/20.500.12272/7462
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