The nucleation and growth of diopside Ca(Mg,Al)(Si,Al)(2)O-6 crystals on the free surface of a 24 wt% MgO, 14 wt% CaO, 9 wt% Al2O3, and 53 wt% SiO2 glass, with a 2 wt% addition of steel fly ash, were investigated through DTA, XRD, SEM, and optical microscopy. Crystallization was complete at similar to920degreesC with an activation energy of 589 kJ/mol. Samples with polished free surfaces were nucleated at selected temperatures in the range of 730degrees to 820degreesC, and then heat-treated at 870degreesC for 15 min for crystal growth. Nucleation was predominantly observed at the surface, and the number of diopside crystals per unit of area and the mechanism of crystallization were determined. It was concluded that nucleation reaches a maximum at 750degreesC, corresponding to an average density of diopside crystals or 8.4 X 10(6) nuclei/cm(2), and that between 900degrees and 1100degreesC, a uniformly crystallized layer is formed at an exponential rate. The crystallized volume fraction increased significantly in the 880degrees-890degreesC growth range, and remained almost constant at higher temperatures. In the 860degrees-910degreesC range. the size of the diopside crystals formed in the samples nucleated at the temperature of the maximum nucleation rate. and linearly increased, reaching values between 1.0 and 3.0 mum at 870degrees and at 910degreesC, respectively.

Nucleation and crystal growth of a MgO-CaO-Al2O3-SiO2 glass with added steel fly ash / Barbieri, Luisa; Corradi, Anna; Lancellotti, Isabella; A. P., NOVAES DE OLIVEIRA; O. E., Alarcon. - In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY. - ISSN 0002-7820. - STAMPA. - 85 [3]:(2002), pp. 670-674.

Nucleation and crystal growth of a MgO-CaO-Al2O3-SiO2 glass with added steel fly ash

BARBIERI, Luisa;CORRADI, Anna;LANCELLOTTI, Isabella;
2002

Abstract

The nucleation and growth of diopside Ca(Mg,Al)(Si,Al)(2)O-6 crystals on the free surface of a 24 wt% MgO, 14 wt% CaO, 9 wt% Al2O3, and 53 wt% SiO2 glass, with a 2 wt% addition of steel fly ash, were investigated through DTA, XRD, SEM, and optical microscopy. Crystallization was complete at similar to920degreesC with an activation energy of 589 kJ/mol. Samples with polished free surfaces were nucleated at selected temperatures in the range of 730degrees to 820degreesC, and then heat-treated at 870degreesC for 15 min for crystal growth. Nucleation was predominantly observed at the surface, and the number of diopside crystals per unit of area and the mechanism of crystallization were determined. It was concluded that nucleation reaches a maximum at 750degreesC, corresponding to an average density of diopside crystals or 8.4 X 10(6) nuclei/cm(2), and that between 900degrees and 1100degreesC, a uniformly crystallized layer is formed at an exponential rate. The crystallized volume fraction increased significantly in the 880degrees-890degreesC growth range, and remained almost constant at higher temperatures. In the 860degrees-910degreesC range. the size of the diopside crystals formed in the samples nucleated at the temperature of the maximum nucleation rate. and linearly increased, reaching values between 1.0 and 3.0 mum at 870degrees and at 910degreesC, respectively.
85 [3]
670
674
Nucleation and crystal growth of a MgO-CaO-Al2O3-SiO2 glass with added steel fly ash / Barbieri, Luisa; Corradi, Anna; Lancellotti, Isabella; A. P., NOVAES DE OLIVEIRA; O. E., Alarcon. - In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY. - ISSN 0002-7820. - STAMPA. - 85 [3]:(2002), pp. 670-674.
Barbieri, Luisa; Corradi, Anna; Lancellotti, Isabella; A. P., NOVAES DE OLIVEIRA; O. E., Alarcon
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/310774
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