Abstract

XU, J.F.; GU, PW.; SU, L.J.  and  ZHANG, J.Y.. Evaluation of surface tension of mold fluxes containing fluoride. J. S. Afr. Inst. Min. Metall. [online]. 2024, vol.124, n.12, pp.755-762. ISSN 2411-9717.  https://doi.org/10.17159/2411-9717/1313/2024.

Surface tension of mold flux is a key factor affecting optimum casting conditions. A thermodynamic model was developed to determine the surface tension of mold flux containing fluoride based on the ion and molecule coexistence theory of slag structure and Butler's equation. The relationship between composition and surface tension was investigated by this model. Results indicated that the calculated values showed good agreement with literature data, and the average error was 8.19%. The surface tension value of the CaO-Al2O3-based mold flux was larger than that of the CaO-SiO2-based mold flux. The surface tension in a multi-component system decreased with increasing contents of SiO₂, CaF₂, and Na₂O, which are considered surface-active components. This trend was more significant in the CaO-Al₂O₃-based mold flux.

Keywords : surface tension; mold flux; fluoride; coexistence theory; model.

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