Synthesis of glass ceramics from kaolin and dolomite mixture

Mohamed Reda Boudchicha; Fausto Rubio; Slimane Achour

doi:10.1007/s12613-017-1395-4

Volume 24 Issue 2

Feb. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(2): 194-201

Mohamed Reda Boudchicha, Fausto Rubio, and Slimane Achour, Synthesis of glass ceramics from kaolin and dolomite mixture, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 194-201. https://doi.org/10.1007/s12613-017-1395-4

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Mohamed Reda Boudchicha, Fausto Rubio, and Slimane Achour, Synthesis of glass ceramics from kaolin and dolomite mixture, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 194-201. https://doi.org/10.1007/s12613-017-1395-4

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Research Article

Synthesis of glass ceramics from kaolin and dolomite mixture

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Corresponding author:
Mohamed Reda Boudchicha E-mail: boudred72@gmail.com
Received: 12 July 2016; Revised: 19 October 2016; Accepted: 27 October 2016

Abstract

Abstract

Cordierite-and anorthite-based binary glass ceramics of the CaO-MgO-Al₂O₃-SiO₂ (CMAS) system were synthesized by mixing local and abundant raw minerals (kaolin and doloma by mass ratio of 82/18). A kinetics study reveals that the activation energy of crystallization (Ea) calculated by the methods of Kissinger and Marotta are 438 kJ·mol^-1 and 459 kJ·mol^-1, respectively. The Avrami parameter (n) is estimated to be approximately equal to 1, corresponding to the surface crystallization mechanism. X-ray diffraction (XRD) analysis shows that the anorthite and cordierite crystals are precipitated from the parent glass as major phases. Anorthite crystals first form at 850℃, whereas the µ-cordierite phase appears after heat treatment at 950℃. Thereafter, the cordierite allotropically transforms to α-cordierite at 1000℃. Complete densification is achieved at 950℃; however, the density slightly decreases at higher temperatures, reaching a stable value of 2.63 kg·m^-3 between 1000℃ and 1100℃. The highest Vickers hardness of 6 GPa is also obtained at 950℃. However, a substantial decrease in hardness is recorded at 1000℃; at higher sintering temperatures, it slightly increases with increasing temperature as the α-cordierite crystallizes.
- glass ceramics;
- kaolinite;
- dolomite;
- crystallization;
- activation energy

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