| Mullite-Corundum Composites from Bauxite:
Effect of Chemical Composition |
Atul V. Maldhure*, H. S. Tripathi, A. Ghosh and S. K. Das
psges 31-36
DOI; 10.1080/0371750X.2013.870050 |
| Abstract |
| In situ mullite-corundum composites have been prepared from low grade Indian bauxite containing high percentage
of impurities (SiO2, Fe2O3, TiO2, CaO) and silica sol to study the effect of different mullite proportions on the
refractory properties. Formation of different phases has been identified by X-ray diffractometry and the microstructure
has been studied by field emission scanning electron microscopy. XRD analysis shows the presence of mainly
mullite and corundum peaks. The bulk density increases and apparent porosity decreases with decreasing amount
of mullite phase proportion in the mullite-corundum sintered aggregate. Refractoriness under load of mullitecorundum
composites increases with increasing corundum amount up to a certain level and then decreases
marginally. The unit cell parameter and cell volume calculated from X-ray diffraction data for mullite also follows
the similar trend.
[Keywords: Bauxite, Mullite-corundum composite, Refractory aggregate, Refractoriness under load] |
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