Ceramics-Silikáty 31, (3) 207 - 217 (1987) |
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STRESS DEVELOPMENT IN KAOLIN BODY DURING FIRING IN THE DEHYDROXYLATION REGION
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Mazačová Yvona 1, Havrda Jiří 1, Hanykýř Vladimír 1,
Švarc Milan 2
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1 Institute of Chemical Technology, Department of the Technology of Silicates, Suchbátarova 5, 166 28 Prague 6
2 National Research Institute for Machine Design, Běchovice, 190 00 Prague 9
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The authors demonstrate a simplified calculation of the radial, tangential and axial components of the stress arising during isothermal and non-isothermal firing of a cylindrical kaolin body in the region of dehydroxylation brought about by temperature and concentration gradients. It was found that a tensile stress develops at the surface, and a compressive one at the body axis on both isothermal and non-isothermal firing. During nonisothermal firing, the surface stress is decreased by the compressive stress due to the temperature gradient. An increase in the rate of firing a cylindrical body from 1 K min⁻¹ to 5 K min⁻¹ was found to raise by 30 % the maximum of resultant tensile stress at the surface. |
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