Abstract
Glasses synthesized from Illinois coal fly ash by conventional melt quenching were recrystallized by suitable nucleation and crystal growth heat treatments. The microstructure and selected properties of the glasses and crystallized glasses were investigated using scanning and scanning transmission electron microscopy (SEM, STEM), Mössbauer spectroscopy, differential thermal analysis (DTA) and X-ray diffraction (XRD). Crystallization of the fly ash glasses without the aid of added nucleating agents was possible up to a maximum of ∼23 vol %. The crystalline phase was tentatively identified on the basis of STEM microanalysis as a combination of ferroaugite [(Ca, Fe2+)(Al, Fe3+)2SiO6] and potassium melilite [KCaAlSi2O7]. Comparative results of the thermal expansion, density and microhardness of the glass and crystallized glass are reported along with the Young's modulus of a glass fibre pulled from the fly ash melt.
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DeGuire, E.J., Risbud, S.H. Crystallization and properties of glasses prepared from Illinois coal fly ash. J Mater Sci 19, 1760–1766 (1984). https://doi.org/10.1007/BF00550245
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DOI: https://doi.org/10.1007/BF00550245