Thermal behavior of zirconia-doped mullite gel fibers

The zirconia-doped mullite gel fibers were prepared via a sol-gel method. The thermal behaviors of the gel fibers during pyrolysis were investigated by means of thermal gravity-differential scanning calorimetry (TG-DSC), in-situ fourier transform infrared spectroscopy (in-situ FTIR), X-ray diffracti...

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Bibliographic Details
Published in:Progress in natural science 2012-06, Vol.22 (3), p.213-218
Main Authors: Wang, Wei, Weng, Duan, Wu, Xiaodong
Format: Article
Language:English
Subjects:
Activation
Activation energy
behavior
doping
energy
fiber
Mullite
Mullite fiber
Thermal
Thermal behavior
Zirconia
Zirconia doping
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Summary:The zirconia-doped mullite gel fibers were prepared via a sol-gel method. The thermal behaviors of the gel fibers during pyrolysis were investigated by means of thermal gravity-differential scanning calorimetry (TG-DSC), in-situ fourier transform infrared spectroscopy (in-situ FTIR), X-ray diffraction (XRD) and transmission electron microscope (TEM). It was found that the mass loss during calcination can be divided into two stages, i.e. 50% below 400 ℃ and 3% during 550-700 ℃. The three exothermic peaks in DSC curves were attributed to the burning of organics, decomposition of nitrates and mullite transformation, respectively. H2O, CO2 and NO2 were generated during the pyrolysis of mullite gel fibers, and the concentration of NO2 was higher than CO2. The activation energy (Ea) of mullite transformation was calculated by a non-isothermal method, which was the smallest for the 1% ZrO2-doped gel fiber (1145 kJ/mol).
ISSN:1002-0071
DOI:10.1016/j.pnsc.2012.04.002