Effect of “Singular Blended Clay” on microstructure and thermo-mechanical properties of vitreous sanitary porcelain


ISSN 1121-7588
K.N. Maiti, P. Agarwal, R.M. Savsani
Central Glass & Ceramic Research Institute, Naroda Centre, Gujarat, India

Abstract

An attempt has been made to develop a “Singular Blended Clay” (SBC) having plastic properties and dry strength required for the production of vitreous sanitary porcelain and tableware. A pre-determined mixture of a crude china clay, plastic ball clay and a plastic fire clay from Indian origin were crushed, blended together and impurities removed by wet processing including gravity settling, screening, deironing and filter pressing. The physico-chemical properties of feed raw materials have also been studied with emphasis on singular blended clay and its influence on the thermo-mechanical properties and microstructure of vitreous sanitary porcelain compositions. Progressive substitution of singular blended clay up to 60 wt % leading to almost complete replacement of traditional crude clays resulted in an increase of flexural strength (~ 32%) and a decrease in thermal expansion (~ 22.7%) due to decrease in residual quartz content in the compositions. The addition of SBC had although little effect on the mullite content of the fired bodies but decreased the vitrification temperature by 50°C and also enhanced the vitrification range.
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