Abstract
Glass-ceramics based on blast-furnace slag (56.78 wt%) were prepared by mixing quartz sand, dolomite, limestone, clay as other batch constituents. The nucleating agents Cr 2O 3, LiF, CaF 2 and TiO 2 were added to the batches to study their effects on the crystallization, phase assemblages, and microstructure. Glass-ceramics were obtained by single and double heat-treatment schedules and examined by DTA, XRD and polarizing microscope. The presence of Cr 2O 3, TiO 2, CaF 2 and LiF was found to enhance the crystallizability of the glass. Cr 2O 3 and TiO 2 are much better than LiF and CaF 2 in promoting homogeneous nucleation and the formation of extremely fine-grained microstructure of aluminous pyroxene and magnetite.
Published Version
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