Development of sintered mullite aggregate from off grade sillimanite

ISSN 1121-7588
H.S. Tripathi, A. Ghosh, B. Mukherjee, S.K. Das
Central Glass & Ceramic Research Institute, Refractories Division, Kolkata, India


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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