Articles
  • Chemical durability of glass-ceramics obtained from waste glass and fly ash
  • Soon-Do Yoona and Yeon-Hum Yunb,*
  • a Department of Applied Chemical Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, South Korea b Department of Geosystem Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, South Korea
Abstract
Applying the mechanical milling method and annealing procedure, we prepared glass-ceramics using fly ash from a thermal power plant mixed with waste glass cullet to resolve the environmental waste recycling problem and find out the optimum crystallizing mechanism. The chemical durability of the heat-treated specimens [850oC, 950oC and 1000oC] was investigated by measuring the weight changes, morphological properties, and chemical composition at the sample surfaces before and after acid immersion by field emission–scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry (EDS). Various properties, such as density, compressive strength, bending strength and Vickers hardness of specimens [before and after acid immersion] were observed. Regardless of chemical treatment, glass-ceramics heat-treated at 850oC, 950oC and 1000oC showed sufficient mechanical properties for practical usage.

Keywords: Glass-ceramics, Chemical durability, Milling method, Mechanical properties.

This Article

  • 2008; 9(2): 135-139

    Published on Apr 30, 2008