Abstract
Characterisation of off grade sillimanite ore and its reaction sintering with calcined alumina to develop mullite aggregate were studied. Off grade sillimanite ore was vibro milled in water for 8 hrs. The dilatometric study of powdered sillimanite ore indicates that densification starts from 973°C and mullite formation starts at 1425°C. TiO2 (addition favours the densification process upto 1550°C. The mullite formed is mostly acicular in nature. Microstructure shows intergranular vitreous phase. The main crystalline phase is mullite with very small amount of corundum. Mullite sample developed at 1600°C without any TiO2 shows the highest strength of 144.2 MPa at 1200°C
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