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Published in: Interceram - International Ceramic Review 3/2020

01-07-2020 | Research and Development

Porogenesis in the Alumina-Brucite-Magnesia-Spinel System

Authors: Rafael Salomão, Isadora Medeiros de Morais Dias, Leandro Fernandes

Published in: Interceram - International Ceramic Review | Issue 3/2020

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Abstract

Abstract: Magnesium monoaluminate spinel (MgAl2O4) is an important raw material for the refractory industry, and its in-situ formation from Al2O3 and MgO sources is an expansive process due to its low density. Such an expansion can be a serious drawback for the production of dense structural bricks and castables, since it frequently causes deformations and cracks and hinders particles from sintering. On the other hand, the same effects can be useful for the production of porous structures used in applications that require densification-resistance and high porosity levels (e.g., thermal insulators and hot-air filters). In this study, calcined alumina and mixtures of magnesium hydroxide (Mg(OH)2 or brucite) and magnesium oxide (MgO or magnesia) were combined with the aim of maximizing the generation of pores after brucite dehydroxylation and volumetric expansion during spinel formation.
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Metadata
Title
Porogenesis in the Alumina-Brucite-Magnesia-Spinel System
Authors
Rafael Salomão
Isadora Medeiros de Morais Dias
Leandro Fernandes
Publication date
01-07-2020
Publisher
Springer Fachmedien Wiesbaden
Published in
Interceram - International Ceramic Review / Issue 3/2020
Print ISSN: 0020-5214
Electronic ISSN: 2523-8957
DOI
https://doi.org/10.1007/s42411-020-0096-6

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