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Effect of modifiers on the properties of glass-ceramics containing coal bottom ash

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2010, 20(1), pp.53-57
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

KANG SEUNG GU 1

1경기대학교

Accredited

ABSTRACT

The influence of CaO addition on the crystallization temperature, crystal types, and microstructure of L-A-S (Li2O-Al2O3-SiO2) glass-ceramics system fabricated from a coal bottom ash, produced at thermal power plant, was studied. The glass transition and crystallization temperatures were shifted to the higher temperature position with increasing CaO content in a non-isothermal analysis using a DTA. The major crystalline phases of L-A-S glass-ceramics system produced were identified as β-spodumene (LiAlSi2O6) and eucryptite (LiAlSiO4). The glass-ceramics showed a bulk and surface crystallization behavior at a time. With increasing CaO content, the β-spodumene peak in XRD increased and some CaOrelated phases were formed. The surface crystal grown from the exterior to the center in glass-ceramics showed various shapes by amount of CaO added. Some cracks were generated at the glass-ceramics containing CaO above 9 wt% due to the mismatch of thermal expansion coefficients between a β-spodumene and CaO-related crystal phases.

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