Phase Analysis in the Crystallization of Cordierite

Abstract:

In this study, α-Cordierite was synthesized via glass-route using kaolin, talc and dolomite as starting raw materials. All the materials were mixed using non-stoichiometric xCaO.21-xMgO-26Al2O3-53SiO2 and melted at 1540°C for 4 h followed by quenching. Various weight percentage (wt%) of CaO (0, 1, 3, 5, 6, 7, 8, 10, 15 wt %) from dolomite was used to study their effects on the formation of α-cordierite. Quantitative phase analysis of sintered samples was carried out using Rietveld method and the results demonstrated total weight percentage of α-cordierite as a function of various composition of CaO. The Rietveld results were normalized to 100 wt% of crystalline fraction, so the hypothetical amorphous content of samples was assumed to be negligible. Quantitative analysis showed that amount of α-cordierite decreased with increasing CaO. Forsterite phase increased with increasing amount of CaO and anorthite phase start to crystallize at 5 wt% CaO. The precipitation of anorthite may be attributing to the glass composition locating in the field of anorthite phase.

• Periodical: Advanced Materials Research (Volume 501)
• Pages: 91-95
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.501.91
• Online since: April 2012
• Authors: Ibrahim Norfadhilah, Zainal Arifin Ahmad, Hasmaliza Mohamad
• Keywords: CaO, Cordierite, Dolomite

References

[1] P. Hing, V. Sinha, Ling, P.B., The effects of some processing parameters on the sinterability, microstructure and properties of sintered cordierite glass ceramic, J. Mat. Proc. Tech. 63 (1997) 604-609

DOI: 10.1016/s0924-0136(96)02692-1

[2] Shi, Z.M., Liang, K.M and Gu, S.R., Effects of CeO2 on phase transformation towards cordierite in Mgo-Al2O3-SiO2 System, J. Mat. Lett 51 (2001) 68-72

DOI: 10.1016/s0167-577x(01)00267-1

[3] Tomba M, A.G., Camerucci, M.A., and Cavalieri, A.L., Indentation profiles of cordierite materials under mechanical and thermal biaxial stress, J. Eur Ceram. Soc. 26 (2006) 2527-2531.

DOI: 10.1016/j.jeurceramsoc.2005.05.004

[4] F. J Torres, L.J. Alarcon, Effects of additives on the crystallization of cordierite-based glass-ceramics ad glazes for floor tiles, J. Eur. Ceram. Soc. 23(6) (2003) 817-826

DOI: 10.1016/s0955-2219(02)00206-6

[5] P.W. McMilan, G. Patridge, The dielectric properties of certain ZnO-Al2O3-SiO2 glass-ceramics, J. Mater. Sci. 7 (8) (1972) 847-855

DOI: 10.1007/bf00550431

[6] E. Yalamac, S.Akkurt, Additives and intensive grinding effects on the synthesis of cordierite, Ceram. Int. 32 (2006) 825-832

[7] J. Banjuraizah, H. Mohamad, Z.A Ahmad, Thermal expansion coefficient and dielectric properties of non-stoichiometric cordierite composition with excess MgO mole ratio synthesize from mainly kaolin and talc by the glass crystallization method, J. Alloys Compd. 494 (2010) 256-260

DOI: 10.1016/j.jallcom.2010.01.002

[8] G.-H. Chen, Sintering, crystallization and properties of CaO doped cordierite-based glass-ceramics, J. Alloys Compd. 455 (2008) 298-302

DOI: 10.1016/j.jallcom.2007.01.036

[9] F. Bouzera, A. Harabi, S. Achour, A. Larbot, Porous ceramic supports for membranes prepared from kaolin and doloma mixtures, J. Eur. Ceram. Soc. 26 (2006) 1663-1671

DOI: 10.1016/j.jeurceramsoc.2005.03.244

[10] C.M Cheng, C. F. Yang, S. H. Lo, The influence of crystallization on the flexural strength of MgO-CaO-Al2O3-SiO2 composite glass, Ceram. Int. 25 (1999) 581 – 586

DOI: 10.1016/s0272-8842(98)00069-8