Dr. Arabinda Mondal
Associate Professor in Ceramic, Department of Silpa-Sadana, PSV, Visva-Bharati, Sriniketan, Birbhum, WB
Download PDFWith the objective of preparing a precursor powder for alumina-mullite composite through a nonconventional colloidal route and characterize the same, the present investigation was undertaken. The important physic-chemical characteristics like molar ratio, bulk density, surface area DTA, IR Spectrum of the synthesized mixed precursor powder were investigated. Equilibrium dehydration-rehydration characteristics of the hydrogel was also examined. The synthesized powders possessed significantly high surface area which followed a direct relationship with Al2O3 content in the composition. Thermal analysis of the precursor powder reflected the expulsion of both loosely bound gel water and dehydroxylation of aluminium hydroxide and the peak temperatures of DTA curves were influenced by the Al2O3 content. The nature of the Rehydration curves remained same irrespective of the mole ratio of SiO2: Al2O3. The magnitude of rehydration was directly related to the Al2O3 content in the composition.
Keywords: Alumina, Mullite, DTA-TGA, Dehydration, Rehydration.
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