Kinetics of non-isothermal crystallization of some glass-ceramics based on basalt |
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| Authors: | C. Păcurariu R. I. Lazău I. Lazău D. Tiţa |
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| Affiliation: | (1) Faculty of Industrial Chemistry and Environmental Engineering, Politehnica’ University of Timişoara, P-ţa Victoriei No. 2, 300006 Timişoara, Romania;(2) Faculty of Pharmacy, University of Medicine and Pharmacy ‘Victor Babeş’, P-ţa E. Murgu no. 2, Timişoara, Romania |
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| Abstract: | The crystallization kinetics of some glass-ceramics obtained from Romanian (Şanoviţa) basalt has been studied in non-isothermal conditions using DTA technique. The activation energies of the crystallization processes were calculated using the isoconversional methods Kissinger-Akahira-Sunose and Ozawa-Flynn-Wall. The results obtained show a dependence of the activation energy (E α) on the crystallized fraction (α) that proves the complex mechanism of the glass-ceramics crystallization process. It has been proved that the Johnson-Mehl-Avrami model cannot be applied for the studied glass-ceramics crystallization process. The effect of 2% TiO2 as nucleating agent upon the crystallization kinetics and upon the microstructure of the studied glass-ceramics was analyzed. |
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| Keywords: | crystallization kinetics glass-ceramics nucleation agents |
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