Elaboration and Characterization of Mullite Refractory Products from Moroccan Andalusite


Enrichment of schist mined in Morocco resulted in an extract essentially made of andalusite, quartz and muscovite, which was investigated with the aim to synthesize mullite refractory materials. X-ray diffraction analysis was used to assess phase transformations upon heating at different temperatures. Mullite formation starts as early as 1200℃ and seems almost total at 1450℃. This process correlates with a weak shrinkage (3.5% at 1450℃) and the formation of an important glass phase. Green compacts obtained by unidirectional pressing the extract powder were heated under air in the temperature range 1200℃ - 1600℃. Chemical and mechanical properties of these materials were investigated and correlated with their microstructure.

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M. Sardy, A. Arib, K. Abbassi and M. Gomina, "Elaboration and Characterization of Mullite Refractory Products from Moroccan Andalusite," New Journal of Glass and Ceramics, Vol. 2 No. 3, 2012, pp. 121-125. doi: 10.4236/njgc.2012.23017.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] W. E. Cameron, “Mullite: A Substituted Alumina,” American Mineralogist, Vol. 62, 1977, pp. 747-755.
[2] I. Peretz and R. C. Bradt, “Andalusite Derived MulliteMatrix Refractories,” Ceramic Transaction, Vol. 6, 1987, pp. 613-633.
[3] M. Mizuno, “Microstructure, Microchemistry and Flexural Strength of Mullite Ceramics,” Journal of the American Ceramic Society, Vol. 74, No. 12, 1991, pp. 3017-3022. doi:10.1111/j.1151-2916.1991.tb04295.x
[4] I. A. Aksay, D. M. Dabbs and M. Sarikaya, “Mullite for Structural, Electronic, and Optical Applications,” Journal of the American Ceramic Society, Vol. 74, No. 10, 1991, pp. 2343-2358. doi:10.1111/j.1151-2916.1991.tb06768.x
[5] A. Yamuna, S. Devanarayanan and M. Lalithambika, “Phase-Pure Mullite from Kaolinite,” Journal of the American Ceramic Society, Vol. 85, No. 6, 2002, pp. 1409-1413. doi:10.1111/j.1151-2916.2002.tb00289.x
[6] E. W. Lee, G. P. Souza, C. J. McCoville, T. Tarvornpanich and Y. Iqbal, “Mullite Formation in Clays and Clay-Derived Vitreous Ceramics,” Journal of the European Ceramic Society, Vol. 28, No. 2, 2008, pp. 465-471.doi:10.1016/j.jeurceramsoc.2007.03.009
[7] J. P. Ildefonse, V. Gabis and F. Cesbron, “Mullitization of Andalusite in Refractory Bricks,” Key Engineering Materials, Vol. 132-136, 1997, pp. 1798-1801.doi:10.4028/www.scientific.net/KEM.132-136.1798
[8] A. Arib, R. El Ouatib, T. Remmal and R. Moussa, “Thermal Behaviour and Structural Transformations of Andalusite-Rich Aluminous Nodules from Morocco,” Key Engineering Materials, Vol. 264-268, No. 3, 2004, pp. 1815-1818.doi:10.4028/www.scientific.net/KEM.264-268.1815
[9] A. Arib, “Valorization of Local Raw Materials by Their Introduction in Industrial Formulations (Ceramic Tiles) and the Elaboration of Silico-Aluminous Ceramic Refractories,” Ph.D. Dissertation, Université Hassan II A?n Chock, Casablanca, 2005.
[10] H. Zanzoun, E. Jabry, M. Gomina and R. Moussa, “Compaction Ability and Influence of the Compaction Pressure on Clay-Based Powders Sintering,” Proc. 4th Eur. Ceram. Soc. Conf., Vol. 11, 1995, pp. 57-65.
[11] M. L. Bouchetou, J. P. Ildefonse, J. Poirier and P. Daniellou, “Mullite Grown from Fired Andalusite Grains: The Role of Impurities and of the High Temperature Liquid Phase on the Kinetics of Mullitization and Consequences on Thermal Shocks Resistance,” Ceramics International, Vol. 31, No. 7, 2005, pp. 999-1005.doi:10.1016/j.ceramint.2004.10.015
[12] I. Ganesh and J. M. F. Ferreira, “Influence of Raw Material Type and of the Overall Chemical Composition on Phase Formation and Sintered Microstructure of Mullite Aggregates,” Ceramics International, Vol. 35, No. 5, 2008, pp. 2007-2015.doi:10.1016/j.ceramint.2008.11.008
[13] BS EN 993-16: “Methods of Test for Dense Shaped Refractory Products. Determination of Resistance to Sulphuric Acide,” 1995.
[14] F. Mazel, M. Gonon and G. Fantozzi, “Manufacture of Mullite Substrates from Andalusite for the Development of Thin Solar Cells,” Journal of the European Ceramic Society, Vol. 22, No. 4, 2002, pp. 453-461.doi:10.1016/S0955-2219(01)00315-6

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