Abstract
Glass-ceramic materials were developed from fly ash samples obtained from Çayırhan 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) 2O 6] 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.
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