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Low-temperature sintered pollucite ceramic from geopolymer precursor using synthetic metakaolin

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Abstract

In this article, pollucite ceramic with high relative density and low coefficient of thermal expansion (CTE) was prepared from Cs-based geopolymer using synthetic metakaolin. Crystallization and sintering behavior of the Cs-based geopolymer together with thermal expansion behavior of the resulted pollucite ceramic were investigated. On heating at 1200 °C for 2 h, the amorphous Cs-based geopolymer completely crystallized into pollucite based on crystal nucleation and growth mechanism. Selected area diffraction analysis and XRD results confirmed the resulted pollucite ceramic at room temperature was pseudo-cubic phase with superlattice structure. Compared with Cs-based geopolymer using natural metakaolin, geopolymer using synthetic metakaolin in this article showed a much lower viscous sintering temperature range, which started at 800 °C, reached a maximum value of −7.47 × 10−4/°C at 1121.9 °C, and ended at 1200 °C. Cesium volatilization appeared only when temperature was above 1250 °C. Therefore, densified pollucite ceramic can be prepared from Cs-based geopolymer using synthetic metakaolin without cesium volatilization. Abnormal thermal shrinkage of pollucite ceramic was observed at temperature range from 25.3 to 54.6 °C because of pseudo-cubic to cubic phase transition, and its average CTE was 2.8 × 10−6/°C from 25 to 1200 °C.

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Acknowledgements

This study was supported by program for new century excellent talents in university (NCET, Grant No. NCET-04-0327), program of excellent team in Harbin Institute of Technology and the science fund for distinguished young scholars of Heilongjiang Province. The authors express their gratitude to Dr. Rao Jiancun in University of Groningen for the discussion on the pollucite phase transition, and we are also very grateful to Professor Liu Kedong in the Department of English Language at Harbin Institute of Technology for his assistance in proofreading.

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  1. HIT Science Park, Institute for Advanced Ceramics, Harbin Institute of Technology, No. 2 Yikuang Street, P.O. Box 3022, Harbin, 150080, People’s Republic of China

    Peigang He & Dechang Jia

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  1. Peigang He
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  2. Dechang Jia
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Correspondence to Dechang Jia.

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He, P., Jia, D. Low-temperature sintered pollucite ceramic from geopolymer precursor using synthetic metakaolin. J Mater Sci 48, 1812–1818 (2013). https://doi.org/10.1007/s10853-012-6944-7

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