Sintering of a clay from Burkina Faso by dilatometry Influence of the applied load and the pre-sintering heating rate |
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Authors: | Karfa Traore, Tibo Sim on Kabre,Philippe Blanchart |
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Affiliation: | a Laboratoire de Physico-Chimie et de Technologie des Matériaux, Faculté des Sciences et Techniques, Université de Ouagadougou, 03 B.P. 7021 Ouagadougou 03, Burkina Faso b GEMH, Ecole Nationale Supérieure de Céramique Industrielle (ENSCI), 43-73 Avenue Albert Thomas 87605 Limoges Cedex, France |
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Abstract: | The sintering of a pottery clay from Burkina Faso was studied as a function of the heating rate, at 3 or 10°C/min. The experimental method used was loading dilatometry in isothermal conditions at 1120°C. In these conditions, we found that the densification rate of the material is low, but tend to a limiting value after 2 h at 1120°C, depending on the pre-sintering heating rate and the load used. The relationship between the pre-sintering heating rate and the densification rate indicated the existence of a weakly organised material at higher heating rates. Nevertheless, higher values of shrinkage were observed when the temperature increased continuously. It is, therefore, proposed that the material is subject to a preferential solid state diffusion mechanism at face to face of the remaining kaolinite layers at high temperatures. This mechanism is favoured by higher heating rates, mainly in the temperature range corresponding to the structural reorganisation of the metakaolin phase. |
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Keywords: | A. Sintering D. Clay Dilatometry Burkina Faso |
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