Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/46261
Title: Study of mullite formation in porcelain stoneware applying isoconversional and IKP methods
Authors: Pérez, Juan M., Rincón López, Jesús María, Romero, Maximina
Keywords: Compensation effect
DTA
Mullite
Porcelain stoneware
Issue Date: 2010
Abstract: The growth process of mullite in a porcelain stoneware body has been studied under isoconversional, isokinetic relationship and invariant kinetic parameters. Activation energy for mullite crystallisation of over 589-628 kJ∙mol-1 and a LnA over 50-59 min-1 was obtained. The model was Johnson-Melh-Avrami with n = 1.5. The model chosen implies quick nucleation and subsequent one or three-dimensional growth. Isoconversional methods show an independent activation energy variation in mid range conversion degrees. Lower and higher conversion degrees show different reactions in mullite formation. Results obtained with the methods employed here are in agreement with a previous paper where the Kissinger non-isothermal method and Ligero et al. approximation were applied. The growth process of mullite in a porcelain stoneware body has been studied under isoconversional, isokinetic relationship and invariant kinetic parameters. Activation energy for mullite crystallisation of over 589-628 kJ∙mol-1 and a LnA over 50-59 min-1 was obtained. The model was Johnson-Melh-Avrami with n = 1.5. The model chosen implies quick nucleation and subsequent one or three-dimensional growth. Isoconversional methods show an independent activation energy variation in mid range conversion degrees. Lower and higher conversion degrees show different reactions in mullite formation. Results obtained with the methods employed here are in agreement with a previous paper where the Kissinger non-isothermal method and Ligero et al. approximation were applied.
Publisher version (URL): http://www.sciencedirect.com/science/journal/02728842
URI: http://hdl.handle.net/10261/46261
ISSN: 1873-3956
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