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Research on Effects of Transition Metal Oxides on Thermal Conductivity of Mold Fluxes

Author: QingXueMei
Tutor: XieBing
School: Chongqing University
Course: Metallurgical Engineering
Keywords: Mold fluxes Transition metal oxides Physical properties Thermal conductivity
CLC: TF777
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


Mold powders are the key auxiliary materials in continuous casting due to their functions of lubricating strand and providing uniform heat transfer across the infiltrated slag layer between strand and mold, which are very important for favoring continuous casting and the slab surface quality. The researches on effects of transition metal oxides on physical properties and thermal conductivity of mold fluxes are not only helpful for both optimizing the composition of mold fluxes and also coordinating the contradiction between lubrication and heat transfer of mold fluxes in mould to improve the quality and production of the slabs. In addition, these researches are important for heat transfer calculation and practical application in continuous casting of titanium and chromium stainless steel.In this paper, the effects of transition metal oxides including TiO2, MnO and Cr2O3 on physical properties and thermal conductivity of mold fluxes, the basicity of which are 0.9, 1.1 and 1.3 respectively, were studied by rotary viscometer, melting point apparatus, mineralographic microscope, XRD, DSC and the conduction heat transfer testing device which was established by hot wire method.Results of characterizing the physical properties showed that:（1）The melting temperature of the mold fluxes can be decreased when TiO2 （contents 04wt%） or MnO （contents 08wt%） was added. The more TiO2 or MnO content, the more melting temperature decreased. The melting temperature of the mold fluxes can be increased when Cr2O3 （contents 04wt%） was added.（2）The viscosity of the mold fluxes with basicity of 0.9 or 1.1 can be deceased when TiO2 （contents 08wt%） or MnO （contents 08wt%） was added in, while the viscosity of the mold fluxes with basicity of 1.3 can not be deceased when TiO2 or MnO was added in. The viscosity of the mold fluxes decreased first and then increased with content of Cr2O3 was added.Thermal conductivity results showed that:（1）The lattice conductivities of the liquid slags were very low（about 0.25～0.77 W/（m·K））, while that of the solid slags were 1.53～2.19 W/（m·K） at temperature of the slags are 1000℃. Around 800℃the lattice conductivities reached maximum because of the debye temperature.（2）The lattice conductivities of the mold fluxes can be increased with increasing the basicity of the mold fluxes below 1100℃when therewas no transition metal oxide added. However, the lattice conductivities of the mold fluxes can be decreased with increasing the basicity of the mold fluxes above 1200℃.（3）The thermal conduction properties of the mold fluxes can be weakened obviously when 08wt% TiO2 was added. The lattice conductivities decreased about 5% whenever increasing 2wt% TiO2.（4）The lattice conductivities of the mold fluxes can be greatly reduced about 10% when 2wt% MnO was added. Then the lattice conductivities increased slowly when the MnO contents in mold fluxes was 28wt%. The lattice conductivities decreased about 2% whenever increasing 2wt% MnO.（5） The lattice conductivities of the mold fluxes decreased with increasing Cr2O3 in the range of 02wt%, while the lattice conductivities of the mold fluxes increased with increasing Cr2O3 in the range of 24wt%. Nevertheless, the lattice conductivities of the mold fluxes can be decreased when Cr2O3 was added.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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