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Low cement Al₂O₃ castable; silica sol; ion exchange.

Silica sols synthesized through different routes viz. inorganic, organic and ion-exchange routes, have been incorporated in the low cement alumina castable composition in various proportions and cast samples in the form of 2 inch cube briquettes were prepared. The cast briquettes after curing were subjected to heat treatment at various temperatures. The effect of different sources of such sols on the important physico-mechanical properties of the castables such as bulk density, apparent porosity, compressive strength, volume shrinkage and residual strength after spalling have been studied. Some of the selected samples were also subjected to microstructural evaluation. It is observed that silica sol synthesized through cation exchange routes has significant beneficial role on the properties of castable with 3% addition.

D Daspoddar¹ Swapan Kr Das² P K Daspoddar¹

1. Department of Chemical Technology, Calcutta University, Kolkata 700 009, India
2. Refractories Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India

Published

February 2003

Manuscript received

27 June 2002

Manuscript revised

23 October 2002