Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C

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, Brandaleze, Elena
Formato: Documento de conferencia publisherVersion
Lenguaje:Inglés
Publicado: Mind Authors Inc. 2022
Materias:
castable
microstructure
dilatometry
XRD
Acceso en línea:https://materialsinfo.mindauthors.com/nov-2020/
http://hdl.handle.net/20.500.12272/7411
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-7411
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic castable
microstructure
dilatometry
XRD
spellingShingle castable
microstructure
dilatometry
XRD
Benavidez, Edgardo
Brandaleze, Elena
Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
topic_facet castable
microstructure
dilatometry
XRD
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 curves, alternating expansion contraction zones were observed in the range 1000-1600°C. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid phase 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
Brandaleze, Elena
author_facet Benavidez, Edgardo
Brandaleze, Elena
author_sort Benavidez, Edgardo
title Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_short Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_full Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_fullStr Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_full_unstemmed Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_sort structural evolution of an al2o3-mgo•al2o3 castable in the range 1000-1600°c
publisher Mind Authors Inc.
publishDate 2022
url https://materialsinfo.mindauthors.com/nov-2020/
http://hdl.handle.net/20.500.12272/7411
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AT brandalezeelena structuralevolutionofanal2o3mgoal2o3castableintherange10001600c
bdutipo_str Repositorios
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