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Abstract
Mullite ceramics was synthesized using boehmite (-AlOOH) as alumina source and polymethysilsesquioxanes (PMS), a novel class of preceramic polymer, as silica source. Quantitative mullitization was calculated from the X-ray diffractograms of powder samples of appropriate stoichiometry of the precursors calcined for various holding times between 1200o and 1300oC, using Rietveld analysis, and the kinetics of phase formation was studied. The rate constant and activation energy of mullitization was calculated by the Johnson-Mehl-Avrami equation. This approach holds great potential for the commercial use of polymeric silica precursor for the fabrication of highly pure mullite and other silicate systems for various application such as thermal and environmental barrier coatings.
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