| Kinetics of Mullitization from Polysilsesquioxane and
Boehmite Precursors |
Rahul Anand, Anshuman Mohanty and Shantanu K Behera*
Pages : 55-59
DOI : 10.1080/0371750X.2020.1869101 |
| 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.
[Keywords: Polymer derived ceramics, Mullite, Polysilsequioxane, Activation energy,
Johnson-Mehl-Avrami equation] |
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