Properties of F-free glass system as a mold flux: viscosity, thermal conductivity and crystallization behavior

Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

“…Besides the experimental research works above, mathematical models have also been developed to study the viscosity of F-free mold flux. 17,18) In the respect of crystallization of F-free mold flux, Choi et al, 19) have investigated the influence of basicity on the crystallization behavior, and the results showed that the basicity tends to enhance the crystallization of the F-free glass mold flux. Fox et al,20) chose the combination of B 2 O 3 and Na 2 O as alternative substitutes for CaF 2 in billet fluxes and found that the crystallinity decreased with the increase of B 2 O 3 .…”

Effect of TiO₂ Addition on Crystallization Characteristics of CaO-Al₂O₃-based Mould Fluxes for High Al Steel Casting

“…As a result, it would deteriorate both the casting operation and the surface quality of cast slabs, and cause many problems such as increased crack frequency, non-uniform heat transfer across the mould flux, reduced lubrication and so on. [2][3][4] In order to solve the problem on chemical composition change of mould fluxes and develop optimal mould flux to meet the requirements of the high aluminum steel casting, previous researchers have proposed the nonreactive CaOAl 2 O 3 based mould flux to substitute for conventional limesilica-based mould fluxes. 2,[5][6][7][8][9][10][11] Blazek et al 7) developed lime-alumina-based mould flux for casting high aluminum TRIP steel.…”

Crystallization Kinetics of CaO-SiO₂(CaO/SiO₂=1)-TiO₂-10 mass%B₂O₃ Glassy Slag by Differential Thermal Analysis

“…3,6,8,[10][11][12][13][14] Lubrication and heat-transfer behavior which control performances of mould fluxes between copper mould and steel shell are very sensitive to the viscosity and crystallization characteristics. [1][2][3][4][5][6][7][8][9] The crystallization of mould fluxes reduces the horizontal heat transfer by two effects: (1) radiation thermal conductivity could be decreased by crystallites which scatter the radiation; 12) (2) interfacial resistance between mould and solidified slag can be increased with formation of more air gaps accompanying crystallization due to the fact that the density of the crystalline phase is greater than that of the glass. 8) Accordingly, it is essential to carry out investigations on the crystallization behaviour of slags.…”

“…[1][2][3][4] Some reports have shown that B2O3 and/or TiO2 may become most promising substitute for fluorides in traditional mould fluxes. [1][2][3][4][5][6][7] According to some previous studies, 1,3,6,7) the existence of TiO2 in mould fluxes can easily lead to the formation of some crystals (e.g. CaTiO3 or CaTiSiO5) with high melting point, which is potential to replace the cuspidine generated by fluorine in mould fluxes and ensure the crystallization ability of slag to achieve good heat transfer performance.…”

“…Besides, B2O3, as an effective fluxing agent to lower the melting point of mould flux, has been taken into consideration for being added to mould fluxes to adjust the viscosity or melting properties of slag. 2,4,5) Accordingly, it is important to investigate the properties of slag containing B2O3 and/or TiO2 for the development of optimal fluorine free mould fluxes.…”