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- 저자 : Fumitaka Tsukihashi (검색결과 3 건)
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Recent Advances in Understanding Physical Properties of Metallurgical Slags
민동준,Fumitaka Tsukihashi 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.1
Present-day knowledge of the structure and physical properties of metallurgical slags is summarized to address structure-property and inter-property relationships. Physical properties of slags including viscosity, electrical conductivity, and surface tension is reviewed focusing on the effect of slag structure, which is comprehensively evaluated using FT-IT, Raman, and MAS-NMR spectroscopy. The effect of the slag composition on slag structure and property is reviewed in detail: Compositional effect encompasses traditional concepts of basicity, network-forming behaviors of anions, and secondary impact of network-modifying cations. Secondary objective of this review is elucidating the mutual relationship between physical properties of slags. For instance, the relationship between slag viscosity and electrical conductivity is suggested by Walden’s rule and discussed based on the experimental results. Slag foaming index is also introduced as a comprehensive understanding method of physical properties of slags. The dimensional analysis was made to address the effect of viscosity, density, and surface tension on the foaming index of slags.
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Radiative Heat Transfer Behavior of Mold Fluxes for Casting Low and Medium Carbon Steels
Wang, Wanlin,Gu, Kezhuan,Zhou, Lejun,Ma, Fanjun,Sohn, Il,Min, Dong Joon,Matsuura, Hiroyuki,Tsukihashi, Fumitaka The Iron and Steel Institute of Japan 2011 ISIJ international Vol.51 No.11
<P>An investigation was carried out to study the radiative heat transfer behavior of two typical mold fluxes for casting low (Flux1) and medium (Flux2) carbon steels. By using an infrared radiation emitter, a radiative heat flux was applied to a copper mold covered with solid mold flux disk to simulate the heat transfer phenomena in continuous casting. The effective thermal conductivities were determined by measuring the temperature gradient in the copper mold system. It was found that the solid crystalline mold Flux2 for casting medium carbon steel has a better capability to transfer heat than that of solid crystalline Flux1, while their glassy fluxes behave similar capability. The DHTT (Double Hot Thermocouple Technique) was employed in this paper to study the heat transfer capability of the crystalline mold fluxes. DHTT measurements suggested that the thermal diffusivity of crystalline sample of Flux2 is higher than that of Flux1. The XRD and SEM results were indicated that the precipitated crystalline phase for Flux1 is only granular cuspidine, Ca<SUB>4</SUB>Si<SUB>2</SUB>O<SUB>7</SUB>F<SUB>2</SUB>, while those for Flux2 are consisted of dendritic cuspidine, Ca<SUB>4</SUB>Si<SUB>2</SUB>O<SUB>7</SUB>F<SUB>2</SUB> and gehlenite, Ca<SUB>2</SUB>Al<SUB>2</SUB>SiO<SUB>7</SUB>.</P>
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