期刊
CERAMICS INTERNATIONAL
卷 41, 期 6, 页码 7751-7758出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.02.107
关键词
Spinel; Refractories; Magnesia; Nanoparticles; Density
资金
- CONACYT
Up to 5 wt% of nano-alumina or nano-iron oxide was added to magnesia refractory matrix. The crystalline phases and microstructure characteristics of specimens sintered at 1600 degrees C for 4 h 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. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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