Synthesis of mullite from calcined alumina, silica and aluminium powder

ISSN 1121-7588
S. Maitra, R. Shibayan, A.K. Bandyapadhyay
College of Ceramic Technology, Kolkata, India


Calcined alumina, silica powder and micro-fine aluminum powder were mixed by two different routes, ca., dry and wet route, to prepare the precursor powder for the formation of mullite ceramic. The compacted powders were subjected to sintering at different elevated temperatures with fixed soaking period. Measurement of different physico-mechanical properties, e.g, bulk density, volume change after firing, apparent porosity, specific gravity and compressive strength revealed that wet mixed batch (by the aqueous route) result in better densification and microstructure development after firing. The sintered batches prepared by both the routes were observed to contain large amount of mullite and corundum phases and very small amount of glassy phases in the microstructure.
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