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Nucleation kinetics of crystalline phases from a kaolinitic body used in the processing of red ceramics

AutorSilva R.A.; Silvio R. Teixeira; Souza, A. E.; Santos D.I.; Romero, Maximina; Rincón López, Jesús María
Palabras claveKinetics
Red ceramic
Fecha de publicaciónabr-2011
CitaciónApplied Clay Science 52:165–170 (2014)
ResumenThe crystallization kinetics of red ceramic raw material from the western part of São Paulo State, Brazil, was examined by differential thermal analysis (DTA) and X-ray diffraction (XRD). The chemical composition of the clay sample was determined by X-ray fluorescence (XRF). Non-isothermal crystallization kinetic methods have been applied to the study of the mechanism of crystallization in this kaolinitic material. The exothermic peak shifted to higher temperatures (945 to 974 °C) with increasing heating rate (10 to 50 °C/min). The average activation energies determined by the Kissinger method (787 ± 85 kJ/mol) and the Ligero method (721 ± 32 kJ/mol) are in agreement. The Avrami constant n obtained by the Ligero method and the m parameter (Matusita method) values were between 1 and 1.5, which indicate a three-dimensional crystal growth with polyhedral morphology and surface nucleation as the dominant mechanism. X-ray diffraction data indicate that this activation energy is not associated with the crystallization of mullite. Scanning electron microscopy (SEM) images of fired (1000 and 1190 °C) samples show their densification during the sinterization process.
Versión del editorhttp//dx.doi.org/10.1016/j.clay.2011.02.019
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