Browsing by Author "LAZIRI, Khadidja"

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    Analytical Study of the Mullite-Cordierite composites prepared by sol-gel method
    (UNIVERSITE MOHAMED BOUDIAF - M’SILA, 2020-09) LAZIRI, Khadidja
    The mullite-cordeirite composites was prepared by Sol-Gel method, using magnesium nitrate powder, aluminum nitrate powder and tetraethyl orthosilicate solution as raw materials, these materials were mixed in various ratios according to stoichiometric formula of the wanted composite, in order to analyze the prepared materials we used several techniques, including Thermogravimetry and Differential Thermal Analysis (TG/DSC), also Dilatometry analysis to observe the phases transformation, and to confirm it we used X-ray diffraction analysis (DRX) which it been used to identify the formed phases of M50C50 which is mullite and cordierite, we also tracked the stages of phase transformations for M50C50 powder that has been treated by DSC at various temperatures using infrared technique (FTIR), by using vibration ranges we were able to identify the formed phase in various temperatures especially the amorphous phases, the activation energy and Avrami parameters for Al-Si spinal phase in the non-isothermal and isothermal treatment were calculated based on DSC analysis results, we found that the energy as the following: 605.86 kj/mol and 595.64 kj/mol respectively, as for the morphological growth parameters n and m are approximately 1.5 which indicating that the dominant crystallization volume mode in spinal phase formation followed by three dimensional growth of spinal crystals with a polyhedral-like shape controlled by diffusion from fixed number of nuclei.