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Preparation and characterization of anorthite and hydroxyapatite from Algerian Kaolin and natural phosphate

Abstract : Different composite materials were prepared using kaolin (DD2) and natural phosphate. Several mixtures were used by varying the kaolin content from 20 to 80 mass %. All powders were mixed and grounded by ball milling and then pressed in cylindrical form. Finally, the green samples were sintered between 1273 and 1673 K for 2 h under static air. Reactions and phase transformations of the powder sintering were studied by BET, thermal techniques (DTA/TG), X-ray diffraction, infrared spectroscopy (FT-IR), dilatometry and SEM analysis. The DTA/TG analysis and dilatometric curves showed some microstructure transformations in these mixtures. From the X-ray diffractograms, we put in evidence the formation of several composites such as: anorthite–Hap-β-TCP, anorthite–Hap, Hap–anorthite, anorthite and anorthite–mullite. The presence of the different composites was confirmed by micrographic observations.
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H. Belhouchet, F. Chouia, M. Hamidouche, Anne Leriche. Preparation and characterization of anorthite and hydroxyapatite from Algerian Kaolin and natural phosphate. Journal of Thermal Analysis and Calorimetry, Springer Verlag, 2016, 126 (3), pp.1045-1057. ⟨10.1007/s10973-016-5655-8⟩. ⟨hal-03117357⟩

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