Abstract
Abstract The aim of this work is to study the sinterability of Ghassoul clay in order to manufacture a magnesium-based ceramics. Phases transformations and mechanical properties, were investigated at temperatures ranging between 1000 and 1250 °C. Several experimental techniques (particle size analysis, TGA/DTA, X-ray diffraction, IR spectroscopy, dilatometric analysis, mechanical three-point bending tests) were carried out on the raw and sintered specimens. The results obtained indicate that Ghassoul consists essentially of stevensite as clay mineral, accompanied by quartz and dolomite. The thermal treatment at 1000 °C leads to the disappearance of stevensite and dolomite as well as the formation of diopside and enstatite. The rise in temperature reveals the transformation of theses phases into clinoenstatite at 1200 °C. The sintering temperature has a strong influence on the mechanical properties. In fact, the increase in temperature is accompanied by a degradation of the mechanical properties, coinciding with the increase of the quantity of the vitreous phase and the total dissolution of the quartz.
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