Crystal Phase and Properties of Hexagonal Columnar Cordierite Synthesized by Forsterite

Abstract

Abstract: Natural forsterite mineral resources are rich in China. Due to the complex composition of this material, it is underutilized and its products have low added value. Forsterite, industrial alumina and quartz sand were used as raw materials to prepare cordierite at 800 ℃ to 1 380 ℃ for 2 h to 8 h in air atmosphere in order to expand the technology of high-efficiency utilization of forsterite. The influences of raw material composition and firing schedule on the synthesis of hexagonal columnar cordierite were studied. The results show that the best sintering system for cordierite is synthesized at 1 380 ℃ for 8 h. At this time, the synthetic purity of cordierite is the highest, the crystal form of cordierite is well developed and the crystal grains are hexagonal columnar. When the sintering temperature is 1 380 ℃ and the holding time is extended from 2 h to 8 h, the corresponding diffraction peak of quartz sand disappeares while the amount of cordierite precipitation increases and the crystallinity of the material is improved. The type of point defects of cordierite crystal is transition from V^"_Mg to O^"_i After the sample with excessive quartz sand is sintered at 1 380 ℃ for 8 h, the cordierite grains are covered and wrapped by glassy phase much more than before, the spacing between grains is reduced, and the density of cordierite increases, but the synthetic purity of cordierite is not improved.

Key words: refractory, forsterite, cordierite, crystallinity, cell volume, density, refractoriness

CLC Number:

TQ175.9

LI Yin, DONG Bo, DENG Chengji, DING Jun, ZHU Hongxi, WANG Hui, YU Chao. Crystal Phase and Properties of Hexagonal Columnar Cordierite Synthesized by Forsterite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3248-3256.

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