Crystallization behavior and structural evaluation of cordierite base glass–ceramic in the presence of CaO and B2O3 additives
The purpose of the present work is to highlight the role of CaO and B2O3 additives on crystallization behavior and microstructural properties of stoichiometric cordierite glass ceramics using differential thermal analysis (DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Vickers micro-hardness and scanning electron microscopy (SEM). The obtained results show that the presence of B2O3 and/or CaO in the initial glass led to precipitation of only one exothermic peak (α-cordierite: Mg2Al4Si5O18). Anorthite phase (CaAl2Si2O8) is also observe as a secondary crystalline phase in CaO containing glasses. It is worth mentioning that, CaO and B2O3 additives strongly encourage the formation of α-cordierite and have the opposite effect on crystallization of µ-cordierite. In order to determine the effect of crystallization and B2O3 and/or CaO additives on the hardness of specimens, the micro-hardness measurement of glasses and glass-ceramics show that the glass ceramic containing CaO (MAS5C) exhibits the highest micro-hardness value, which depends on the high crystallinity value in this specimen.
Copyright (c) 2022 Zahra Shamohammadi Ghahsareh, Mohammad rezvani
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