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

The effects of basicity (CaO/SiO 2 ), B 2 O 3 , and Li 2 O 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...

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Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2014-10, Vol.45 (5), p.1874-1886
Main Authors: Seo, Myung-Duk, Shi, Cheng-Bin, Cho, Jung-Wook, Kim, Seon-Hyo
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Materials Science
Metallic Materials
Metals. Metallurgy
Nanotechnology
Production of metals
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The effects of basicity (CaO/SiO 2 ), B 2 O 3 , and Li 2 O 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 B 2 O 3 suppresses the crystallization of mold flux. The crystallization temperature of mold flux decreases with Li 2 O 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.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-014-0091-2