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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 57  1998
Evaluation and Utilization of Rajpardi Clay in the Production of Traditional Ceramics : Part-IV: Development of Crockery and Tablewares through Optimum Utilization of Rajpardi Clay in Substitution
S. K. MUKHERJI, B. B. MACHHOYA AND K. N. MAITI
Pages : 43-49
DOI : 10.1080/0371750X.1998.10804829
Abstract
A standard stoneware crockery body mix (RPC-STD) consisting of calcined quartz 25 wt%, potash feldspar 20 wt%, Eklera china clay 10 wt%, Amrapali (Grade II) china clay 10 wt%, Orient china clay 10 wt%, Bikaner Ball clay 15 wt% and Than clay 10 wt% was taken as a starting composition with the objective of studying the suitability of Rajpardi clay in the manufacture of stoneware crockery. Progressive incorporation of Rajpardi plastic clay in replacements of Bikaner ball clay and Than plastic clay in the standard crockery body composition resulted in the gradual increase in plasticity and unfired strengths of the body mixes. The increase in strengths were 44 and 59% for RPC-3 body mix containing IS wt% Rajpardi clay in complete replacement of Bikaner and in RPC-5 body mix containing 25 wt% Rajpardi clay with complete replacement of both Bikaner and Than clays respectively. The complete replacement of traditional Bikaner and Than plastic clays by Rajpardi clay showed a reduction in maturing temperature by SO"C and increase in fired strength by 11.8% as compared to that of the standard body. This was attributed to the presence of more fluxy impurities in Rajpardi clay. All these properties would lead towards the economical production of improved stoneware crockerywares containing Rajpardi day either in the replacement of Bikaner clay or in the complete replacement of both Bikaner and Than clays in the standard crockery composition.
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