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Activation energy for mullitization of gel fibres obtained from aluminum isopropoxide

Research paper by HONGBIN TAN, YAPING DING, HAIHONG ZHANG, JIANFENG YANG, GUANJUN QIAO

Indexed on: 23 Oct '12Published on: 23 Oct '12Published in: Bulletin of Materials Science



Abstract

Gel fibres of mullite precursor were prepared from an aqueous solution of aluminum nitrate (AN), aluminum isopropoxide (AIP) and tetraethylorthosilicate (TEOS). A 4:1 molar ratio of aluminum isopropoxide and aluminum nitrate was optimized to obtain spinnable precursor sol for synthesis of fibres. Thermogravimetry–differential scanning calorimetry (TG–DSC), Fourier transform infrared (FTIR) spectra and X-ray diffraction (XRD) analyses were used to characterize properties of the gel and ceramic fibres. The precursor gel completely transformed to mullite at 1200 °C. The activation energy of mullite crystallization was 993·5 kJ/mol by the Kissinger equation.