Characterization of a glass-ceramic produced from thermal power plant fly ashes

Erol M. , GENC A., Ovecoglu M. L. , YUCELEN E., KUCUKBAYRAK S. , TAPTIK Y.

Journal of the European Ceramic Society, vol.20, no.12, pp.2209-2214, 2000 (Journal Indexed in SCI Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 20 Issue: 12
  • Publication Date: 2000
  • Doi Number: 10.1016/s0955-2219(00)00099-6
  • Title of Journal : Journal of the European Ceramic Society
  • Page Numbers: pp.2209-2214
  • Keywords: fly ash, glass-ceramics, mechanical properties, waste products, CRYSTALLIZATION, SLAG


Glass-ceramic materials were developed from fly ash samples obtained from Cayirhan Thermal Power Plant in Turkey. On the basis of DTA analyses, nucleation experiments were carried out at 680 °C for 5, 10 and 15 h whereas crystallization experiments were performed at 924 °C for 20 min. Crystallized samples were cooled in the furnace. X-ray diffraction analyses revealed the presence of only the diopside [Ca(Mg,Al)(Si,Al)2O6] phase in the produced glass-ceramic samples and scanning electron microscopy (SEM) investigations showed the presence of a homogeneously dispersed phase. The results of the Vickers microhardness tests indicated that the hardness values of the fly ash based glass-ceramic decreased with the increases in holding time at the nucleation temperature. In addition, wear resistance of fly ash-based glass-ceramics decreased with holding time at the nucleation temperature.