Synthesis and characterization of sol-gel derived monophasic mullite powder Síntese e caracterização de pó de mulita monofásico derivado de sol-gel

Jana, A and Ray, D (2020) Synthesis and characterization of sol-gel derived monophasic mullite powder Síntese e caracterização de pó de mulita monofásico derivado de sol-gel. In: Ceramica, 66 (379). pp. 307-313.

PDF cer_66-379_307-313_2020.pdf - Published Version Restricted to Registered users only Download (1MB)

Abstract

High-purity microfine mullite precursor powder of stoichiometric chemical composition, 3Al2O3.2SiO2, was synthesized through the sol-gel route using aluminum isopropoxide and tetraethyl orthosilicate. The derived mullite precursor powder was characterized by BET surface area, particle size distribution, Fourier-transform infrared spectroscopy, thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy. Phase analysis of the precursor powder and calcined samples at different temperatures was done by XRD. Non-isothermal crystallization kinetics of mullite precursor was studied by TG-DTA in static air using heating rates of 5.0, 7.5, 10.0, 12.5, and 15 K.min-1. Grain morphology was studied by SEM. The results showed that synthesized mullite precursor powder possessed homogeneity of Al and Si components, and the amorphous precursor powder was converted to monophasic mullite crystal when heat-treated at 970 °C. Based on Flynn-Wall-Ozawa and Kissinger equations, the activation energy associated with the crystallization of mullite was determined to be 1189.8 and 1189.0 kJ.mol-1, respectively. © 2020 Associacao Brasileira de Ceramica. All rights reserved.

Item Type:	Journal Article
Publication:	Ceramica
Publisher:	Associacao Brasileira de Ceramica
Additional Information:	The copyright of this article belongs to Associacao Brasileira de Ceramica
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Feb 2021 06:57
Last Modified:	02 Feb 2021 06:57
URI:	http://eprints.iisc.ac.in/id/eprint/67404

Actions (login required)

View Item