SYNTHESIS AND CHARACTERIZATION OF PRECURSOR FOR AL2O3-MULLITE COMPOSITE DERIVED FROM DEHYDROXYLATED KAOLINITE
Dr. Arabinda Mondal
Associate Professor in Ceramic, Department of Silpa-Sadana, PSV, Visva-Bharati, Sriniketan, Birbhum, WB
26-39
Vol: 6, Issue: 1, 2016
Receiving Date:
2015-11-15
Acceptance Date:
2015-12-15
Publication Date:
2016-01-10
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Abstract
With 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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