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Phase Analysis in the Crystallization of Cordierite

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.