Characterization and crystallization kinetics of a diopside-based glass-ceramic developed from glass industry raw materials


Ovecoglu M. L. , KUBAN B., OZER H.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, cilt.17, ss.957-962, 1997 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 17 Konu: 7
  • Basım Tarihi: 1997
  • Doi Numarası: 10.1016/s0955-2219(96)00200-2
  • Dergi Adı: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Sayfa Sayıları: ss.957-962

Özet

Glass industry raw materials blended with 10 wt% technical grade TiO2 powders were used to develop a glass-ceramic of the SiO2-MgO-Al2O3-CaO-(Na2O,K2O) system. On the basis of the DTA analysis, nucleation and crystallization experiments were carried out at 735 and 870 degrees C, respectively. X-ray diffraction studies performed on the glass-ceramic system revealed the presence of the diopside as the major crystallizing phase comprising about 74 vol%. SEM investigations showed that the diopside crystals were formed as a result of surface nucleation and were conical in shape, between 15 and 40 mu m in length and between 5 and 13 mu m in width. DTA analyses were conducted at different heating rates and an activation energy for surface crystallization value of 150 kJ/mole was determined graphically from a Kissinger-type plot using the analysis of Matusita and Sakka. This value is about half of that for the same glass composition without the TiO, content. (C) 1997 Elsevier Science Limited.