This 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 nepheline (Na2O•Al2O3•SiO2) is the major crystalline phase in the temperature interval 700-950ºC and forsterite (2MgO•SiO2) predominates at temperatures above 950ºC. A study of the microstructure by scanning electron microscopy (SEM) allowed to establish the morphological evolution in both shape and spatial arrangement of the nepheline and forsterite crystals on heating.
CRYSTALLISATION AND MICROSTRUCTURE OF NEPHELINE FORSTERITE GLASS-CERAMICS / M., Martín; F., Andreola; L., Barbieri; Bondioli, Federica; I., Lancellotti; J., Rincón; M., Romero. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - 39(3)(2013), pp. 2955-2966.
|Titolo:||CRYSTALLISATION AND MICROSTRUCTURE OF NEPHELINE FORSTERITE GLASS-CERAMICS|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ceramint.2012.09.072|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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