Thermal Transformation of Fired Clay Ceramics by Dilatometric Analysis

Abstract

In the present study the mechanism and kinetic parameters of allotropic transformation (α → β) of the quartz of Algerian clay from Al-maathed was studied by dilatometric analysis technique. The activation energies measured by both isothermal (Johnson-Mehl-Avrami theory using Ligero method) and non-isothermal (Kissinger methods) treatments were 980 and 1050 kJmol −1 , respectively. The growth morphology parameters n (Avrami parameter) which indicates the crystallization mode were found to be almost equal to 1.5, using non-isothermal treatments, and equal to 1.4 using isothermal (Ligero method). The numerical factor which depends on the dimensionality of crystal growth m obtained by Matusita et al. equation was 1.50. Analysis of the results shows that the bulk nucleation is the dominant mechanism in β-quartz crystallization and the three-dimensional growth of β-quartz crystals with polyhedron-like morphology occurs, controlled by diffusion from a constant number of nuclei.

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