Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties

A processing strategy for obtaining alumina-spodumene ceramics from fine commercial powders is presented. In this work, a spodumene addition to calcined alumina powder was performed and their proportion was explored between 15 and 45 wt%. The industrial spodumene presented secondary phases, mainly a...

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Autores principales: Hernández, María Florencia, López, Paula Virginia, Violini, María Agustina, Suárez, Gustavo, Conconi, María Susana, Rendtorff Birrer, Nicolás Maximiliano
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Química
Structural ceramics
Alumina
Spodumene
Processing
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128008
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128008
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Structural ceramics
Alumina
Spodumene
Processing
spellingShingle Química
Structural ceramics
Alumina
Spodumene
Processing
Hernández, María Florencia
López, Paula Virginia
Violini, María Agustina
Suárez, Gustavo
Conconi, María Susana
Rendtorff Birrer, Nicolás Maximiliano
Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
topic_facet Química
Structural ceramics
Alumina
Spodumene
Processing
description A processing strategy for obtaining alumina-spodumene ceramics from fine commercial powders is presented. In this work, a spodumene addition to calcined alumina powder was performed and their proportion was explored between 15 and 45 wt%. The industrial spodumene presented secondary phases, mainly albite and quartz. Mechanical properties were evaluated. Although they were lower than those of sintered alumina, based on the achieved values an adequate behavior in structural applications can be assumed, especially taking into account that the better mechanical behavior was coupled with the lower thermal expansion. Relatively low thermal expansion (≈ 5 x 10-1 °C-1) behaviors were observed in one of the developed materials. Noncrystalline phases containing lithium were detected. We assume that all the lithium oxide incorporated through the spodumene is in the glassy phase after the sintering of the materials. This difference in lithium concentration in the composition of the resulting glass affected the thermal expansion of the developed materials. Particularly with low lithium content (30 wt% of additive) the material performance was enhanced. This, together with the mechanical behavior, encourages structural applications with high thermomechanical solicitations. With the information gathered, a wide range of materials with specific properties can be obtained by modulating the spodumene-alumina proportion only.
format Articulo
Articulo
author Hernández, María Florencia
López, Paula Virginia
Violini, María Agustina
Suárez, Gustavo
Conconi, María Susana
Rendtorff Birrer, Nicolás Maximiliano
author_facet Hernández, María Florencia
López, Paula Virginia
Violini, María Agustina
Suárez, Gustavo
Conconi, María Susana
Rendtorff Birrer, Nicolás Maximiliano
author_sort Hernández, María Florencia
title Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
title_short Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
title_full Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
title_fullStr Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
title_full_unstemmed Dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
title_sort dense alumina-mullite composite ceramics from alumina and spodumene-albite feldspar binary mixtures: processing and properties
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/128008
work_keys_str_mv AT hernandezmariaflorencia densealuminamullitecompositeceramicsfromaluminaandspodumenealbitefeldsparbinarymixturesprocessingandproperties
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bdutipo_str Repositorios
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