Activation energy for mullitization of gel fibres obtained from aluminum isopropoxide

Bulletin of Materials Science

关键词: Mullite;    fibres;    sol–gel method;    activation energy.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

CC BY