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함티탄자철광 Slag 의 유동층 염소화에 의한 TiCl4 의 제조
송기영,이상순,이철태 ( Ki Young Song,Sang Soon Lee,Chul Tae Lee ) 한국공업화학회 1993 공업화학 Vol.4 No.1
국내 부존 함티탄자철광으로부터 염화티타늄(TiCl_4)을 제조키 위해 함티탄자철광의 arc-smelting으로부터 얻어지는 titanium slag의 유동층 염소화 반응을 조사하였다. Titanium slag의 유동층 염소화반응에 적절한 반응조건은 반응 온도 950℃, 반응시간 90분, 염소가스의 유속 3.0 ㎝/sec, titanium slag에 대한 petroleum coke의 무게비 0.18, 그리고 titanium slag 및 petroleum coke의 입자의 평균직경은 각각 44.6㎛, 67.9㎛였다. 위 조건하에서 titanium slag중의 97.07%의 티타늄이 염소화되었으며 제조된 염화티타늄(TiCl_4)의 순도는 96.2%였다. The chlorination of the titanium slag from titaniferrous magnetite by the arc-smelting in a fluidized bed reactor was investigated to produce TiCl_4, from domestic titaniferrous magnetite. The optimum conditions are as follows:reaction temperature ; 950℃, reaction time ,90min, Cl_2 gas velocity ; 3 ㎝/sec, and petroleum coke-to-titanium slag weight ratio , 0.18. Also the mean diameter of titanium slag and petroleum coke was 44.6㎛ and 67.9㎛ respectively. Under these conditions, 97.07% of Ti component in the titanium slag was chlorinated and the purity of TiCl_4 from this chlorination was 96.2% .
송기영,김경택,정성혜,Song, Ki-Young,Kim, Kyoung-Taek,Jung, Sung-Hae 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
A microstrip filter has been designed and fabricated in hairpin form on a GaAs substrate and its characteristics such as the insertion loss, return loss, and bandwidth have been investigated. The presented filter is realized with relatively small size, 4.5 by 3.6 mm. The insertion loss and return loss of the filter are 1.17 dB and 30 dB, respectively. The filter exhibits 3 dB-bandwidth of 350 MHz at the center frequency, 5.890 GHz. The experimental results show good agreement with the numerical ones. However, the measured center frequency is about 100 MHz higher than the designed one.
함티탄자철광 Slag의 유동층 염소화에 의한 TiCl<sub>4</sub>의 제조
송기영,이상순,이철태,Song, Ki-Young,Lee, Sang-Soon,Lee, Chul-Tae 한국공업화학회 1993 공업화학 Vol.4 No.1
국내 부존 함티탄자철광으로부터 염화티타늄($TiCl_4$)을 제조키 위해 함티탄자철광의 arc-smelting으로부터 얻어지는 titanium slag의 유동층 염소화 반응을 조사하였다. Titanium slag의 유동층 염소화반응에 적절한 반응조건은 반응 온도 $950^{\circ}C$, 반응시간 90분, 염소가스의 유속 3.0cm/sec, titanium slag에 대한 petroleum coke의 무게비 0.18, 그리고 titanium slag 및 petroleum coke의 입자의 평균직경은 각각 $44.6{\mu}m$, $67.9{\mu}m$였다. 위 조건하에서 titanium slug 중의 97.07%의 티타늄이 염소화 되었으며 제조된 염화티타늄($TiCl_4$)의 순도는 96.2%였다. The chlorination of the titanium slag from titaniferrous magnetite by the arc-smelting in a fluidized bed reactor was investigated to produce $TiCl_4$ from domestic titaniferrous magnetite. The optimum conditions are as follows : reaction temperature; $950^{\circ}C$, reaction time; 90min, $Cl_2$ gas velocity; 3cm/sec, and petroleum coke-to-titanium slag weight ratio; 0.18. Also the mean diameter of titanium slag and petroleum coke was $44.6{\mu}m$ and $67.9{\mu}m$ respectively. Under these conditions 97.07% of Ti component in the titanium slag was chlorinated and the purity of $TiCl_4$ from this chlorination was 96.2%.
송기영(Ki Young Song),정도관(Do Kwan Chung),박민수(Min Soo Park),주종남(Chong Nam Chu) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.8
In this study, a simple and effective method was proposed to minimize electrolytic corrosion on the workpiece during ED-drilling using water as a working fluid. The adhesion of a cover plate onto the surface of the workpiece was greatly effective for suppressing electrolytic corrosion during ED-drilling. The experiment revealed that the adhesion of the cover plate prevented corrosion without causing significant changes in machining characteristics. Using the machining method proposed in this paper, electrolytic-corrosion-free holes can be machined without change in the machinery system. By using corrosion-free hole as a start hole for wire EDM, a lead frame die with high quality was fabricated successfully.
송기영(Ki Young Song),정도관(Do Kwan Chung),박민수(Min Soo Park),주종남(Chong Nam Chu) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.10
Electrical discharge drilling (ED-drilling) is a widespread machining method used to bore small holes with a high aspect ratio. This paper presents additional methods by which ED-drilling can improve machining speed, tool wear, and machined surface quality. Firstly, for high machining speed, and low tool wear, a new-type electrode that was ground on one side or both sides of the cylindrical electrodes was suggested to expel debris. The debris which is generated during the machining process can cause sludge deposition and secondary discharge problems: major reasons to decrease machining speed. This new-type electrode also reduced tool wear that was due to the decrease of unstable discharge in a machining gap by helping to expel waste water and debris from the gap. Secondly, to improve the machined surface roughness, an electrolyzation process was included after drilling. This process made the machined surface smooth by means of an electrochemical reaction between an electrode and a workpiece. In this study, the machining speed, electrode wear, and surface roughness were improved by the newtype electrode and the electrolytic process.