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Título

Crystallisation and microstructure of nepheline-forsterite glass-ceramics

Autor Martín, María Isabel; Andreola, Fernanda; Barbieri, Luisa; Bondioli, Federica; Lancellotti, Isabella; Rincón López, Jesús María; Romero, Maximina
Palabras clave Waste valorization
vitrification
Glass-ceramics
Sintering
Microstructure
Forsterite
Nepheline
Rice husk ash
Fecha de publicación 2013
EditorElsevier
Citación Ceramics International, 39(2013) 2955-2966
ResumenThis work presents the results of a study focused on the development of forsterite-nepheline glass-ceramic with the use of rice husk ash (RHA) as a silica source. The glass-ceramics were produced by a sintering process of a glassy frit formulated in the MgO-Al2O3-SiO2 base system with the addition of B2O3 and Na2O to facilitate the melting and pouring processes. The crystallisation study was carried out by depicting the TTT curve (Time-Temperature-Transformation). The mineralogical characterisation of the glass-ceramic materials was carried out using X-ray diffraction (XRD). The crystallisation activation energies were calculated by the Kissinger method. The results obtained show that devitrification of the RHA glass leads to a glass-ceramic material composed of nepheline (Na2O•Al2O3•2SiO2) and forsterite (2MgO•SiO2). A study of the microstructure by scanning electron microscopy (SEM) allowed to establish the morphological evolution in both the shape and spatial arrangement of the nepheline and forsterite crystals on heating.
Versión del editorhttp://dx.doi.org/10.1016/j.ceramint.2012.09.072
URI http://hdl.handle.net/10261/88568
DOI10.1016/j.ceramint.2012.09.072
ISSN0272-8842
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