Kinetics of crystallization processes in some glass ceramic products |
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| Authors: | Păcurariu P. Liťă D. Lazău R. I. Kovacs G. Lazău I. |
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| Affiliation: | (1) Faculty of Industrial Chemistry and Environmental Engineering, 'Politehnica' University Timięoara, 1, P-ťa Victoriei No. 2, 1900 Timişoara, Romania;(2) Faculty of Pharmacy, University of Medicine and Pharmacy 'Victor Babeę', P-ťa E. Murgu no.2, 1900 Timięoara, Romania;(3) PROCEMA S. A, Calea źagului nr. 104, 1900 Timięoara, Romania |
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| Abstract: | The paper presents the kinetic study of the crystallization processes which take place in basalt glasses containing variable amount of nucleation agent (CaF2, 310%). The activation energies have been calculated using Kissinger's equation and verified with the Ozawa-Flynn-Wall equation. In this order, the DTA curves have been registered with different heating rates, between 4 and 20 degrees/min. A correlation equation between the activation energy and the amount of nucleation agent (% of CaF2) was established. By X-ray diffraction it was proved that the crystalline phase formed in the crystallization process represents a pyroxenic solid solution, Ca(Mg,Fe)SiO3. This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | glass ceramics kinetic study of crystallization processes nucleation agents |
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