Utilization of coal-ash minerals for technological ceramics

B. Cumpston, F. Shadman, S. Risbud

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44 Scopus citations

Abstract

Glasses synthesized from Utah bituminous coal-ash melts were crystallized to form glass ceramics to determine the feasibility of coal-ash utilization. The use of additives to promote glass formation and catalysts to serve as nucleation sites for crystallization was studied. The microstructure of the crystalline phase was investigated using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The bulk glasses and glass-ceramics were evaluated by Knoop microhardness and density measurements. The crystalline phase formed has been identified as anorthite, CaAl2Si2O8. Crystallization of the ash was possible up to a maximum of approximately 40%. The use of TiO2 as a nucleation catalyst did little to improve the degree of crystallinity; however, the crystal phase became better defined when this catalyst was used, even in small amounts.

Original languageEnglish (US)
Pages (from-to)1781-1784
Number of pages4
JournalJournal of Materials Science
Volume27
Issue number7
DOIs
StatePublished - Apr 1 1992

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ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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