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ZnO and MgO as inducers of spinel-like phase formation on alumina-based castables.
- Source :
-
Journal of the European Ceramic Society . Dec2022, Vol. 42 Issue 15, p7335-7342. 8p. - Publication Year :
- 2022
-
Abstract
- Environmental issues regarding Cr6+ formation lead to replacing chrome-containing refractories with greener alternatives. MgO-containing compositions have been extensively investigated for this purpose, however, few studies evaluated the likelihood of using other chemical elements as inducers of spinel-like phase formation in refractory castables. In this study, the addition of zincite in alumina-based castables was evaluated and compared with its MgO-counterpart. In-situ elastic modulus, assisted sinterability and differential scanning calorimetry pointed out that the gahnite (ZnAl 2 O 4) formation took place at lower temperatures (∼ 1100 °C) than MgAl 2 O 4 (∼ 1300 °C). On one hand, this feature induces anticipated strengthening of the Zn-containing compositions, giving rise to the possibility of firing these compositions at lower temperatures. On the other, the faster kinetics of gahnite formation led to a significant Kirkendall effect, changing the morphology of the pores created during sintering, which became preferentially located at the interface of alumina aggregates, negatively affecting some mechanical properties of the castable. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 42
- Issue :
- 15
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 159189517
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2022.08.030