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Crystallization kinetics of glass-ceramics by differential thermal analysis

Ghasemzadeh, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. Publisher: 2011
  3. Abstract:
  4. The crystallization behavior of fluorphlogopite, a glass-ceramic in the MgO-SiO2-Al2O3-K2O-B 2O3-F system, was studied by substitution of Li 2O for K2O in the glass composition. DTA, XRD and SEM were used for the study of crystallization behavior, formed phases and microstructure of the resulting glass-ceramics. Crystallization kinetics of the glass was investigated under non-isothermal conditions, using the formal theory of transformations for heterogeneous nucleation. The crystallization results were analyzed, and both the activation energy of crystallization process as well as the crystallization mechanism were characterized. Calculated kinetic parameters indicated that the appropriate crystallization mechanism was bulk crystallization for base glass and the sample with addition of Li2O. Non-isothermal DTA experiments showed that the crystallization activation energies of base glasses was in the range of 234-246 KJ/mol and in the samples with addition of Li2O was changed to the range of 317-322 KJ/mol
  5. Keywords:
  6. Activation energy of crystallization ; Bulk crystallization ; Crystallization activation energy ; Crystallization behavior ; Crystallization mechanisms ; F system ; Formal theory ; Glass compositions ; Heterogeneous nucleation ; Non-isothermal condition ; Nonisothermal ; Phlogopite ; XRD ; Activation energy ; Behavioral research ; Differential thermal analysis ; Glass ceramics ; Kinetics ; Mica ; Microstructure ; Silicon compounds ; Crystallization kinetics
  7. Source: Ceramics - Silikaty ; Volume 55, Issue 2 , May , 2011 , Pages 188-194 ; 08625468 (ISSN)
  8. URL: http://www.ikiu.ac.ir/public_files/profiles/items/1351421023.pdf