Effect of presintered and in situ spinels on microstructure and properties of a low cement refractory castable - Part 2


ISSN 1121-7588
S. Mukhopadhyay, P.K. Das Poddar*
College of Ceramic Technology, 73, A.C. Banerjee lane. Kolkata, India.
* Dept. of Chemical Technology, 92 APC Road, C.U., Kolkata, India.

Abstract

Hydrated magnesium aluminate gel additive, prepared by the sol gel route from cheaper precursors, was characterized by X ray diffraction, Infrared spectroscopy, Thermogravimetric analysis, Particle size distribution and utilized in a high alumina based refractory castable to obtain in situ spinel bonds. A commercially available more expensive presintered spinel powder was also characterized and incorporated to the same castable composition. The properties related to the performance of these two kinds of spinel-alumina castables, e.g. Bulk density, Apparent porosity, Cold crushing strength, Thermal shock, Flexural strength, Volume change and Slag corrosion resistance were studied. XRD, Scanning electron microscopy and
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