Influence of particle size on the crystallization kinetics of glasses produced from waste materials


Erol M. M. , KUCUKBAYRAK S., ERSOY-MERICBOYU A.

JOURNAL OF NON-CRYSTALLINE SOLIDS, cilt.357, ss.211-219, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 357 Konu: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jnoncrysol.2010.09.027
  • Dergi Adı: JOURNAL OF NON-CRYSTALLINE SOLIDS
  • Sayfa Sayıları: ss.211-219

Özet

The crystallization behavior and kinetics of glasses produced from coal fly ashes, red mud and silica fume were investigated by using differential thermal analysis, X-ray diffraction and scanning electron microscopy techniques. The kinetic parameters of the glass-crystallization transformation were estimated under non-isothermal conditions applying three different equations, namely, Kissinger, Matusuta-Sakka and Ozawa. Non-isothermal differential thermal analysis curves were obtained using both coarse and fine glass samples. The crystallization activation energies of coarse glasses are in the range of 233-439 kJ/mol while the activation energies of fine glasses change in the range of 369-450 kJ/mol. Avrami exponent, n, values of coarse glasses indicated the three-dimensional bulk crystallization. This result is in well agreement with the cross-sectional scanning electron microscopy investigations. The values of the n obtained experimentally are in the range of 1.24-1.36 for fine glasses which show the one-dimensional surface crystallization. The crystallized phase of the glass-ceramic samples produced from waste glasses by applying the controlled heat treatment process was identified as diopside by X-ray diffraction analysis. (C) 2010 Elsevier B.V. All rights reserved.