Abstract
Silica phase widely existed in the process of synthesis of cordierite. In order to study the influence of silica phase on synthesis of cordierite, the reaction of quartz-alumina-magnesia system has been researched. The complex reaction process and mechanism of synthesis are elucidated by means of scanning electron microscope, X-ray diffraction, and thermoanalysis. The relationship between sintering properties and reaction process has been researched. Formation of cordierite is a multiple-step process of five stages with different reaction rates, which are controlled by the transformation of silica phase. At different stages, prevailing reactions of cordierite synthesis are as follows: (i) reaction of quartz and alumina-magnesia, (ii) reaction of quartz and MgAl2O4 spinel, and (iii) reaction of cristobalite and MgAl2O4 spinel. Each stage is correlated with different synthesis quantity of cordierite and has a great impact on sintering properties. The presence of cristobalite increases the synthesis temperature of cordierite and reduces the purity of cordierite ceramic. Therefore, the improvement of cordierite properties is possible by inhibiting quartz transformation into cristobalite in process of synthesis of cordierite.
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The authors are very grateful to the financial support from the “973 Program (2010CB227105),” P. R. China.
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Wu, J., Lu, C., Xu, X. et al. Influence of silica phase transformation on synthesis of cordierite ceramic. J Aust Ceram Soc 53, 499–510 (2017). https://doi.org/10.1007/s41779-017-0060-8
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DOI: https://doi.org/10.1007/s41779-017-0060-8