Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 5, Pages 7067-7072Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.12.038
Keywords
Sol-gel growth; Electron microscopy; Fourier transform infrared spectroscopy (FTIR); X-ray scattering; Phase transitions
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Funding
- Directorate General of Higher Education Republic of Indonesia [133/SP2H/PL/Dit. Litabmas/III/2012]
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The sol-gel synthesis and characterization of mullite precursor derived from rice husk silica and aluminum nitrate hydrate [(Al(NO3)(3)center dot 9H(2)O] has been investigated. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) coupled with Rietveld analysis, and scanning electron microscopy (SEM). FTIR results showed the presence of Si-O-Si, Al-O-Al, and Si-O-Al functional groups, which were associated with mullite, corundum, quartz, and cristobalite, as verified by XRD analysis. It is concluded that mullite formation started at 1150 degrees C, and its abundance increased rapidly with an increase in temperature from 1150 to 1350 degrees C, resulting in increased phase content from 30.9 to 67.7 wt%. Although mullite was formed at a low temperature, the complete reaction between corundum and silica to form mullite was not achieved. This finding demonstrated that rice husk silica is a potential alternative raw material for the production of mullite ceramic. Crown Copyright (C) 2013 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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