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Crystallization Behaviors of CaO-SiO2-Al2O3-Na2O-CaF2-(Li2O-B2O3) Mold Fluxes

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Abstract

The effects of basicity (CaO/SiO2), B2O3, and Li2O addition on the crystallization behaviors of lime-silica-based mold fluxes have been investigated by non-isothermal differential scanning calorimetry (DSC), field emission scanning electron microscopy, X-ray diffraction (XRD), and single hot thermocouple technique. It was found that the crystallization temperature of cuspidine increased with increasing the basicity of mold fluxes. The crystallization of wollastonite was suppressed with increasing the mold flux basicity due to the enhancement of cuspidine crystallization. The addition of B2O3 suppresses the crystallization of mold flux. The crystallization temperature of mold flux decreases with Li2O addition. The size of cuspidine increases, while the number of cuspidine decreases with increasing mold flux basicity. The morphology of cuspidine in mold fluxes with lower basicity is largely dendritic. The dendritic cuspidine in mold fluxes is composed of many fine cuspidine crystals. On the contrary, in mold fluxes with higher basicity, the cuspidine crystals are larger in size with mainly faceted morphology. The crystalline phase evolution was also calculated using a thermodynamic database, and compared with the experimental results determined by DSC and XRD. The results of thermodynamic calculation of crystalline phase formation are in accordance with the results determined by DSC and XRD.

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Acknowledgments

The authors would like to express sincere thanks to Mr. Seung-Moo Kang and Mr. Jeong-Hyouk Park, Stollberg & Samil Co., Ltd. for preparing mold flux samples. This work was financially supported by the Global Excellent Technology Innovation (Grant No. 10045029) funded by the Ministry of Trade, Industry & Energy (MOTIE) of Korea.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea

    Myung-Duk Seo (Ph.D. Candidate), Cheng-Bin Shi (Postdoctoral Fellow) & Seon-Hyo Kim (Professor)

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea

    Jung-Wook Cho (Research Associate Professor)

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  1. Myung-Duk Seo
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  2. Cheng-Bin Shi
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  3. Jung-Wook Cho
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  4. Seon-Hyo Kim
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Correspondence to Jung-Wook Cho.

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Manuscript submitted March 3, 2014.

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Seo, MD., Shi, CB., Cho, JW. et al. Crystallization Behaviors of CaO-SiO2-Al2O3-Na2O-CaF2-(Li2O-B2O3) Mold Fluxes. Metall Mater Trans B 45, 1874–1886 (2014). https://doi.org/10.1007/s11663-014-0091-2

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