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최영진(Y. J. Choi),장세종(S. J. Jang),김상욱(S. W. Kim),전병서(B. S. Jeon),김상무(S. M. Kim),송창빈(C. B. Song),김용찬(Y. C. Kim),남궁정(J. Namkung) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.1
This study was carried out to investigate a influence of humidity variation (%) on the magnetic properties and the surface flaws in the fabrication of Fe-based Fe78Si9B13 amorphous alloy ribbon by Planar Flow Casting process. As a result, the size of the air pocket and the droplet which is observed in the contact surface and the free face of the amorphous alloy ribbon becomes large when the humidity increases and the size highly increases with the surface roughness at the same time. Especially, the surface roughness value which is made in the 65 % of the humidity is the lowest in the contact surface (Ra = 0.60 μm, Rz = 3.11 μm) and the free face (Ra = 0.47 μm, Rz = 3.00 μm). Also, in case of the soft magnetic property of the magnetic core which is made with the toroidal core of 23(OD)*20(ID)*20(H) size, in the sample of the amorphous alloy ribbon which is made in 65% of the humidity, the most excellent value is gained as Bs(B<SUB>700</SUB>) = 1.055 T, H<SUB>c</SUB> = 0.083 Oe, permeability = 1,197 and core loss = 0.276W/kg.
구광모(K. M. Ku),오경석(K. S. Oh),서정열(J. Y. Seo),이봉상(B. S. Lee),강권호(K. H. Kang),송창빈(C. B. Song) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The quality of aluminum extrudate is decided during extrusion process which involves heat generated mainly by plastic deformation energy and friction between billet and die. The extra heat should be eliminated to appropriate level in order to prevent grain growth of an extrudate. In aluminum industry, the die temperature is managed by nitrogen gas which is safe and relatively cheap. In this study, the flow pattern of nitrogen gas in die cooling system and cooling behavior were analyzed by computational fluid dynamic code, ANSYS CFX 12. The fundamental cooling behavior of die was obtained through the analysis and effective cooling channel design was suggested based on the flow patterns according to gas velocity.
철기(Fe Based) 나노결정질 합금 분말코어의 코팅제 및 입도가 연자기적 특성에 미치는 영향
장세종(S. J. Jang),최영진(Y. J. Choi),김상욱(S. W. Kim),전병서(B. S. Jeon),이태행(T. H. Lee),송창빈(C. B. Song),남궁정(J. Namkung) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.3
This is a basic research for improving soft magnetic property of Fe based nano crystalline alloy powder core. The main study is done around characteristics of permeability, core loss, and DC bias depending on amount of insulation coating agent and particle size. First, Fe<SUB>73.5</SUB>Si<SUB>13.5</SUB>B<SUB>9</SUB>Nb₃Cu₁ amorphous alloy ribbon was fabricated by using the planar flow casting (PFC) device. Then, heat treatment and ball milling were done to obtain alloy powder. The amount of polyether imide (PEI) added to it was varied by 0.5, 1.0, 2.0, 2.5 wt% to have compression molding into 16 ton/㎠. After going through crystalline heat treatment, the made toroidal nano crystalline powder core (OD12.7 mm*ID7.62 mm*H4.75 mm) had smaller permeability as amount of insulation coating agent decreases. However, it was found out that core loss and DC bias characteristics have been improved. The reason for this results were expected to be because green density of power core decreases as amorphous alloy powder particles become smaller as amount of alloy powder insulation coating agent increases, it was determined that 1 wt% of insulation coating agent is appropriate. Also, for powder core made based on alloy powder size with amount of insulation coating agent fixed at 1 wt%, effective permeability and core loss were outstanding as particle size became bigger. However, characteristics of DC bias became worse as applied DC field increases. This is expected to be due to insulation effect, residual pores, or molding density of powder core resulting from thickness of coating on surface of alloy powder.
趙統來,宋昌彬,後藤左吉 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
There is Zinc present in the sludge of the Iorn and steel making process. If the Zinc in the sludge can be removed cost-effectively, then the sludge can be used as Iorn ore. The Zinc in the sludge can exist in the form of Zn or ZnFe₂O₄. Out of these two, ZnO reacts with NH₄SCN and forms Zn(SCN)₂which disolves lasily in water. However, ZnFe₂O₄does not react well with NH₄SCN and so it cannot be removed using NH₄SCN. The coke oven gas contains sulphur. The sulphur is removed using ammonia as a medium. During this process, waste liquid solution containing about 11% of NH₄SCN and about 9% of (NH₄)₂S₂O₃is produced in a large quantity. One steel mill produces about 140m3 of this waste liquid per day. This solution is simply treated as waste and thrown out. Instead of throwing it out, if we were to use this NH₄SCN solution to remove ZnO from sludge, them I can be done cheaply. This research aims to know how the NH₄SCN solution, which is produced by the gas emitted from cokes furnace, can be used to remove Zinc from the siudge cost-effectivly and to re-use the sludge as Iron ore.