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Investigation of Effects of SiO2 Content and Cooling Rate on Crystallization in Fe2O3-CaO-SiO2 System Using In Situ Confocal Laser Scanning Microscopy

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Abstract

The crystallization behaviors of the Fe2O3-CaO-SiO2 system in a non-equilibrium state with various chemical compositions and cooling rates were investigated by confocal laser scanning. Equilibrium samples were prepared in melt states and cooled at a rate of 1 K/min to produce samples in quasi-equilibrium states. The effect of SiO2 on the phase constitution was investigated using Image Analyzer, and the changes of the phase ratios were analyzed using activity values of Fe2O3 calculated using FactSage 7.1. The Continuous cooling transformation diagram of the Fe2O3-CaO-SiO2 system was obtained for various cooling rates. The temperatures at which the primary phase formed for various SiO2 contents and cooling rates differed from the equilibrium temperatures, and the phase-formation temperature ranges varied with the cooling rate. In addition, the reduction degree of each sample was measured to determine the effect of SiO2 content and cooling rate on the Fe2O3-CaO-SiO2 system. The reduction degree in the FeO3-CaO-SiO2 system is dominantly influenced by the SiO2 bond-phase morphology (CF, C2S, C3S, or glass) rather than the cooling rate.

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  • 27 March 2019

    In multiple places in the text FeO<Subscript>3</Subscript> should be replaced by Fe<Subscript>2</Subscript>O<Subscript>3</Subscript>. The following acknowledgments were missed: Acknowledgments: This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry &amp; Energy (MOTIE) of the Republic of Korea (No. 20172010106300).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea

    Tae Jun Park, Joon Sung Choi & Dong Joon Min

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  1. Tae Jun Park
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  2. Joon Sung Choi
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  3. Dong Joon Min
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Correspondence to Dong Joon Min.

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Manuscript submitted October 18, 2018.

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Park, T.J., Choi, J.S. & Min, D.J. Investigation of Effects of SiO2 Content and Cooling Rate on Crystallization in Fe2O3-CaO-SiO2 System Using In Situ Confocal Laser Scanning Microscopy. Metall Mater Trans B 50, 790–798 (2019). https://doi.org/10.1007/s11663-019-01518-y

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