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Evaluation of the matrix characteristics of refractory castable containing gel-routed nanosized spinel
S. Ghosal, S. Bodhak, A. Chowdhury,
Published in
Volume: 26
Issue: 1
Pages: 29 - 36
Properties of a refractory castable bonded with sol-gel-routed nanostructured spinel (MgAl2O4) additive have been found to be much better than the same bonded by spinel synthesized via a fast coprecipitation method. The sol-gel additive also sets aside the conventionally coprecipitated spinel which is agglomerated. The microstructural studies (SEM and EDS) of the fired matrix of the castable indicates that the reactive sol-gel fines can improve the thermal shock and slag corrosion resistances. The results of XRD, IR, DTG, TEM and particle size distribution experiments of the rapidly coprecipitated spinel shows that this agglomerated additive also suffers from incomplete spinel formation with a huge amount of residual groups associated to its structure. Consequently it is not suggested as a suitable matrix powder for the refractory material investigated in this work.
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JournalIndustrial Ceramics