Prasad, C S and Kumar, D and Karmakar, D P and Gupta, A K and Chakrabarti, S (2002) Development of a volume stable stoneware body for manufacturing crockery. Transactions of the Indian Ceramic Society, 61 (4). pp. 168-172. ISSN 0371-750X

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Presently, most of the units at Khurja fire their products in tunnel kiln. However, they are facing the problem of high level of rejections due to distortion and warping of the fired products which has been attributed to uneven temperature distribution in the hot zone of the kiln as well as short firing range of the composition of the articles. To overcome this problem, an attempt has been made to develop a stoneware composition, which will have better volume stability in the prevailing temperature range in the firing zone of the kiln. The results of the experimental work have been presented in this paper. Circuitously volume stable stoneware body was developed by modification in the composition as well as by controlling particle size of body mix. Developed body consists of 15% more fine particles below 10 micron than conventional body. The developed body possesses around 10.2% higher fired strength (1069−2) than conventional body (970 kg.cm2) at their respective maturing temperatures. The fired shrinkage is marginally higher than conventional body at maturing temperature, having circuitously stable fired shrinkage variation only 1.22% (10.61 to 10.74%) between 1180° and 1250°C in comparison to firing shrinkage variation 23.43% (7.58 to 9.90%) of conventional body. The developed body is matured at 1200°C, which is 50°C lower than the maturing temperature of conventional body. Marginal decrease in the thermal expansion, due to finer particles in the body mix, would improve thermal shock resistance property of the products, probably making them less prone to dunting. These properties would be helpful to reduce distortion and the fuel consumption for firing of green products.

Item Type: Article
Subjects: Whiteware
Divisions: Advanced Clay & Traditional Ceramics
Depositing User: Bidhan Chaudhuri
Date Deposited: 23 Mar 2012 09:52
Last Modified: 07 Mar 2014 12:03

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