| Development of a Volume Stable Stoneware Body
for Manufacturing Crockery |
C. S. Prasad, Dinesh Kumar, D. P. Karmakar, A. K. Gupta and S. Chakrabarti
Pages : 168-172
DOI : 10.1080/0371750X.2002.10800056 |
| Abstract |
| Presently, most of the units at Khurja fire their products in tunnel
kiln. However, they are facing the problem of high level of
rejectidns 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 (1 069 kg.cm-2) than conventional body
(970 kg.cm-2
) 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. |
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