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20122

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Author: search.filters.author.Abadlia, Mohamed TaharSubject: search.filters.subject.Aluminum silicates

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    Thermal behaviour of kaolin of tamazert (Algeria) deposit
    (2012) Zibouche, Fatima; Kerdjoudj, H.; Abadlia, Mohamed Tahar
    Kaolin from Tamazert deposit in the north Algeria was used in this study. The physical and chemical properties were determined by the performance of several analyses as well as the X-ray fluorescence, X-ray diffraction, thermal behaviour (ATD, TG), dilatometric and granulometric distribution. The study of ceramic behaviour as function of firing temperature has been investigated by shrinkage, adsorption both density and mechanical tests after gradually increasing from room temperature to 1500 °C. The modification of the structure of the raw material samples has been observed after fining and the crystallization of mullite and amorphous silica phase were confirmed by scanning microscopy SEM and evaluated by XRD. The suitability of kaolin for ceramics process was discussed from the linear shrinkage, both density and open porosity. The amorphous phase content is varied from 27-34 % and the tests of flexion have been carried out as depending of temperature, revealed a suitable mechanical properties and the relationship between amorphous phase and sample properties. The adsorption rate was found to be about 35%
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    Structural characterization of mullite formed from heated kaolin of tamazert deposit (Algeria)
    (2012) Zibouche, Fatima; Kerdjoudj, H.; Abadlia, Mohamed Tahar
    A quantitative analysis of the mullite phase obtained after sintering of the kaolin has been performed by treatment of X ray diagrams. Kaolin is treated in the range of 950-1400 *deg;C. The oxide NiO is added as internal standard after cooling to sintered sample kaolin. Bragg Brentano diffractometer, scanning electron microscopy and differential thermal analysis were used. Analyses of selected directions profile of mullite were carried out by using the adjustment of program, available in the software Highscore of Pan Analytical. The mullite phase that formed from kaolin appears at 1000 °C, observed by XRD and tallies with DTA. The primary mullite crystal showed a plate-like morphology. Two kinds of morphology corresponding to primary (elongated grains) and secondary (equiaxed grains) mullite were observed. A bimodal crystallite size distribution was detected through XRD microstructural analysis from 1300 °C. The apparent sizes obtained of crystallites are determined for mullite with directions-dependent (anisotropy)