Activation energy of mullite crystallisation from precursor fibres determined by differential scanning calorimetry

Author： Tan H B   Ding Y P   Yang J F   Qiao G J  

Publisher： Maney Publishing

ISSN： 1743-2847

Source： Materials Science and Technology, Vol.27, Iss.5, 2011-05, pp. : 933-936

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Abstract

Mullite fibres were prepared by the sol-gel method using aluminium lactate and tetraethylorthosilicate. The aluminium lactate was prepared by mixing aluminium nitrate and lactic acid with a molar ratio of 1:3. Thermogravimetry-differential scanning calorimetry, X-ray diffraction and scanning electron microscopy analysis were used to characterise the properties of the gel and ceramic fibres. The gel fibres completely transformed to mullite fibres at 1200°C, with a uniform diameter and dense microstructure. The active energy of mullite crystallisation was 1121·7 kJ mol−1 by the Kissinger equation, which was consistent with most data reported by other authors.

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