Effect of addition of Al2O3 and Fe2O3 nanoparticles on the microstructural and physico-chemical evolution of dense magnesia composite

Up to 5wt% of nano-alumina or nano-iron oxide was added to magnesia refractory matrix. The crystalline phases and microstructure characteristics of specimens sintered at 1600°C for 4h in an electric furnace were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively....

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Bibliographic Details
Published in:	Ceramics international 2015-07, Vol.41 (6), p.7751-7758
Main Authors:	Gómez Rodríguez, C., Das Roy, T.K., Shaji, S., Castillo Rodríguez, G.A, García Quiñonez, L., Rodríguez, Edén, González, J.O., Aguilar-Martínez, J.A.
Format:	Article
Language:	eng
Subjects:	Aluminum oxide D. Spinel Density E. Refractories Formations Iron oxides Magnesia Magnesium oxide Microstructure Nanoparticles Spinel
Online Access:	Get full text
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Summary:	Up to 5wt% of nano-alumina or nano-iron oxide was added to magnesia refractory matrix. The crystalline phases and microstructure characteristics of specimens sintered at 1600°C for 4h in an electric furnace were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The physical properties are reported in terms of density and porosity. The mechanical behavior was studied by a cold crushing strength (CCS) test. In addition, the chemical behavior with regard to slag attack was studied by the SEM technique. As a result, it was found that the presence of nano-iron oxide in the magnesia matrix induced magnesioferrite spinel formation, which improved the sintering process. Nano-iron oxide also influenced the bonding structure through a direct bonding enhancement. On the other hand, the presence of nano-alumina in the magnesia matrix induced magnesium-aluminate spinel formation, resulting in lower properties in comparison with those obtained by nano-iron oxide addition.
ISSN:	0272-8842 1873-3956