| Synthesis and Mechanical Properties of Mullite Developed
from Beach Sand Sillimanite : Effect of Fe20 3 |
H. S. TRIPATHI AND G. BANERJEE
Pages : 137-140
DOI : 10.1080/0371750X.1998.10804854 |
| Abstract |
| Mullite aggregate was developed from sillimanite beach sand
and calcined alumina by the reaction sintering route using
1-4 wt% Fe20 3 as additive .. Effect of Fe20 3 on the densification
behaviour, microstructure and thermomechanical
properties of the aggregate was discussed. It was found that
Fe20l favours densification process by liquid phase formation,
thereby deteriorating the thermomechanical properties
particularly at higher sintering temperature. Mullite formed
without Fe20 3 additive at 1600°C was mostly equiaxed in
nature whereas it was needle shaped with few occasional
equiaxed mullite grains within the matrix when formed in
presence of Fe20 3 at 1500°C. Up to 4.08 wt% Fe20 3 enters
into the mullite structure by solid solution formation at 1500°C. |
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