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SHS 공정에 의해 제조된 Mo<sub>x</sub>W<sub>1-x</sub>Si<sub>2</sub> 발열체의 열화메커니즘
이동원,이상헌,김용남,이성철,구상모,오종민,Lee, Dong-Won,Lee, Sang-Hun,Kim, Yong-Nam,Lee, Sung-Chul,Koo, Sang-Mo,Oh, Jong-Min 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.10
The degradation mechanism of $Mo_xW_{1-x}Si_2$ ultrahigh-temperature heating elements fabricated by self-propagating high-temperature synthesiswas investigated. The $Mo_xW_{1-x}Si_2$ specimens (with and without post-annealing) were subjected to ADTs (accelerated degradation tests) at temperatures up to $1,700^{\circ}C$ at heating rates of 3, 4, 5, 7, and $14^{\circ}C/min$. The surface loads of all the specimen heaters were increased with the increase in the target temperature. For the $Mo_xW_{1-x}Si_2$ specimens without annealing, many pores and secondary-phase particles were observed in the microstructure; the surface load increased to $23.9W/cm^2$ at $1,700^{\circ}C$, while the bending strength drastically reduced to 242 MPa. In contrast, the $Mo_xW_{1-x}Si_2$ specimens after post-annealing retained $single-Mo_xW_{1-x}Si_2$ phases and showed superior durability after the ADT. Consequently, it is thought that the formation of microcracks and coarse secondary phases during the ADT are the main causes for the degraded performance of the $Mo_xW_{1-x}Si_2$ heating elements without post-annealing.
마그네슘의 금속염화물 환원에 의한 초미립 TiCN 분말합성
이동원,김진천,김용진,김병기,Lee, Dong-Won,Kim, Jin-Chun,Kim, Yong-Jin,Kim, Byoung-Kee 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.2
The ultrafine titanium carbonitride particles ($TiC_{0.7}N_{0.3}$) below 100nm in mean size were successfully synthesized by Mg-thermal reduction process. The nanostructured sub-stoichiometric titanium carbide ($TiC_{0.7}$) particles were produced by the magnesium reduction at 1123K of gaseous $TiC_{l4}+xC_2Cl_4$ and the heat treatments in vacuum were performed for five hours to remove residual magnesium and magnesium chloride mixed with $TiC_{0.7}$. And final $TiC_{0.7}N_{0.3}$ phase was obtained by nitrification under normal $N_2$ gas at 1373K for 2 hrs. The purity of produced $TiC_{0.7}N_{0.3}$ particles was above 99.3% and the oxygen contents below 0.2 wt%. We investigated in particular the effects of the temperatures in vacuum treatment on the particle refinement of final product.
마그네슘환원에 의한 C/N 조성제어 초미립 TiC<sub>x</sub>N<sub>y</sub> 분말 합성
이동원,김병기,윤중열,유지훈,김용진,Lee, Dong-Won,Kim, Byoung-Kee,Yun, Jung-Yeul,Yu, Ji-Hoon,Kim, Yong-Jin 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.2
The ultrafine titanium carbonitride ($TiC_xN_y$) particles below 100 nm in mean size, including various carbon and nitrogen contents (x=0.55~0.9, y=0.1~0.5), were successfully synthesized by new Mg-thermal reduction process. Nanostructured sub-stoichiometric titanium carbide ($TiC_x$) particles were initially produced by the magnesium reduction of gaseous $TiCl_4+x/2C_2Cl_4$ at $890^{\circ}C$ and post heat treatments in vacuum were performed for 2 hrs to remove residual magnesium and magnesium chloride mixed with $TiC_x$. Finally, well C/N-controled $TiC_xN_y$ phases were successfully produced by nitrification heat treatment under normal $N_2$ gas atmosphere at $1150^{\circ}C$ for 2 hrs. The values of purity, mean particle size and oxygen content of produced particles were about 99.3%, 100 nm and 0.2 wt.%, respectively.
이동원,Hyun Kyu Jeong,박정용,Jong Hyuk Lee,Son Jeong Wang,Yong Hwan Jeong,Young Duk Bae,Bong Guen Hong 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
In order to investigate the manufacturing and qualification methods for the first wall (FW) of the International Thermonuclear Experimental Reactor (ITER), we fabricated several mock-ups with various shapes through the hot isostatic pressing (HIP) bonding method for joining the Cu-alloy with Be armor and the Cu-alloy with stainless steel (SS). Non-destructive test (NDT) methods currently being developed for the ITER FW were applied to these mock-ups to find the defects. Ultrasonic test (UT) showed that a probe of 10 MHz and 0.25 inch in diameter could detect defects up to 3 mm in diameter. The eddy current test (ECT) for the SS tube was simulated with a numerical code and showed the feasibility of detecting defects in the SS tube. Thermography was simulated with a numerical code, CFX-10, and preliminary tests were performed. Also, a high heat flux (HHF) test was performed up to 1000 cycles at 5.0 MW/m2 for the Cu/SS mock-up in Japan (JEBIS, JAEA Electron Beam Irradiation Stand), and it is being prepared for the Be/Cu mock-up in Russia. .
설문지를 통한 한국인 아토피피부염 임상병력의 진단적 중요성에 관한 연구
이동원,변대규,김진우 ( Dong Won Lee,Dae Gyoo Byun,Jin Wou Kim ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.3
Backgroud: Recent studies have shown an incomplete agreement with the previously proposed diagnostic criteria of Hanifin and Rajka for atopic dermatitis(AD). This could be due to ethnic differences in the clinical manifestations of AD. To make a diagnosis of AD with confidence, one has to depend on the history and clinical picture according to race. Objectives : The purpose of the present study was to find out the importance of individual symptoms and histories for the diagnosis of Korean AD by questionnaire. Methods : The frequency of 25 questionnaire items was studied in 130 patients with typical AD (48 childhood, 82 adolescence/adult) compared to that in 198 control subjects (89 childhood, 109 adolescence/adult). Results : Nine items(itchy with bodily heat, itchy when sweating, cholinergic urticaria, miliaria, irritation with fabrics, food reaction, pollen allergy, itch with stress) were shown to be of much diagnostic significance(p<0.001) in childhood AD,otherwise thirteen items(itchy with bodily heat, itchy when sweating, cholinergic urticaria, sense of fever, excessive sweating, miliaria, irritation with cosmetics, irritation with fabrics, irritation prone hands, itchy with woolen clothes, pollen allergy, itch with stress, dermographism) were in adolescent and adult, AD. ConClusion : We found some diagnostic significance of clinical histories in Korean AD patients by questionnaire. We propose that this accessible questionnaire would be an efficient and powerful method with which to obtain new and valid information on AD. (Kor J Dermatol 1997;35(3): 443-445)
마그네슘 열환원에 의한 저응집 초미립 TiCN 분말합성
이동원,Lee, Dong-Won 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.5
The ultra-fine and less agglomerated titanium carbonitride particles were successfully synthesized by magnesiothermic reduction with low feeding rate of $TiCl_4+1/4C_2Cl_4$ solution. The sub-stoichiometric titanium carbide ($TiC_{0.5{\sim}0.6}$) particles were produced by reduction of chlorine component by liquid magnesium at $800^{\circ}C$ of gaseous $TiCl_4+1/4C_2Cl_4$ and the heat treatments in vacuum were performed for 5 hours to remove the residual magnesium and magnesium chloride mixed with produced $TiC_{{\sim}0.5}$. The final $TiC_{{\sim}0.5}N_{0{\sim}0.5}$ particle with near 100 nm in mean size and high specific surface area of $65m^2/g$ was obtained by nitrification under nitrogen gas at $1,150^{\circ}C$ for 2 hrs.
이동원,윤중열,신선명,김인수,왕제필,Lee, Dong-Won,Yun, Jung-Yeul,Shin, Shun-Myung,Kim, In-Soo,Wang, Jei-Pil 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.3
The study on the fabrication of iron powder from forging scales using hydrogen gas has been conducted on the effect of hydrogen partial pressure, temperature, and reactive time. The mechanism for the reduction of iron oxides was proposed with various steps, and it was found that reduction pattern might be different depending on temperature. The iron content in the scale and reduction ratio of oxygen were both increased with increasing reactive time at 0.1atm of hydrogen partial pressure. On the other hand, for over 30 minutes at 0.5 atm of hydrogen partial pressure, the values were found to be almost same. In the long run, iron metallic powder was obtained with over 90% of iron content and an average size of its powder was observed to be about $100{\mu}m$.
입자 사이즈에 따른 Cu 필름의 에어로졸 성막 거동에 대한 연구
이동원,오종민,Lee, Dong-Won,Oh, Jong-Min 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.4
The effect of particle sizes on the aerosol deposition (AD) of Cu films is investigated in order to understand the deposition behaviors of metal powder during the AD process. The Cu coatings fabricated by using $2{\mu}m$ Cu powders had a dense microstructure, a high deposition rate ($1.6{\pm}0.2{\mu}m/min$), and low resistance ($9.42{\pm}0.4{\mu}{\Omega}{\cdot}cm$) compared to that from using Cu powder with a particle size greater than $5{\mu}m$. Also, from estimating the internal micro-strain of Cu films, the Cu coatings fabricated by using $2{\mu}m$ Cu particles exhibited a high micro-strain value of $3.307{\times}10^{-3}$. On the other hand, the strain of Cu coatings fabricated with $5{\mu}m$ particles was decreased to $2.76{\times}10^{-3}$. These results seem to show that the impacted Cu particles are compressed and flattened by shock waves, and that their bonding is associated with the high internal micro-strain caused by plastic deformation.
치매(痴呆)에 관(關)한 동서의학적(東西醫學的) 비교(比較) 고찰(考察)
이동원,신길조,이원철,Lee, Dong-Weon,Shin, Gil-Jo,Lee, Won-Chul 대한한방내과학회 1995 大韓韓方內科學會誌 Vol.16 No.1
This study was done in order to investigate the etiology and pathology of dementia in the variety literature. Dementia in elderly persons(above the age of 60) mainly classfied Alzheimer disease and Cerebral vascular dementia. The results were as follows: 1. Dementia patients have abnormal mental function, who have no mental weakness but defects of memory, verbal disturbance, behavior disturbance and loss of intellectual function. 2. Dementia regard as 'me-beng(?病)', 'jeon-gwang(癲狂)', and 'heo-ro(虛勞)' in oriental medicine and the symptom is a silence with no response, mixing, a crying or a laugh, a stranger behavior and a amnesia; disturbances of speech, emotion, behavior. 3. Dementia caused by Alzheimer disease, Multi infarct dementia, Parkinson's disease, sequelae of acute CO poisoning, head injury and alcoholism(occidental medically) and the 'Dam(痰) and Damhwa(痰火), weakness of heart and spleen(心脾虛) caused by pent up anger of seven emotions(七情鬱結), the weakness of liver and kidney(肝腎不足)(oriental medically). 4. The causes of Alzheimer disease are various; a heredity factor, a morphological factor of brain tissues, a psychological factor and a biochemical factor (occidental medically) ; the 'Dam(痰) and Damhwa(痰火) caused by weakness of the internal organs and disturbance of the emotions(oriental medically). 5. Cerebral vascular dementia caused by loss of the certain cerebral neurons and oriental medically caused by obstruction of 'dam(痰)' or 'eo heul(瘀血)'. It is recommended that further study of many sided investigations, specially against a weakness of spiritual functions and a certain neurotoxin in the future.
이동원,박근태,임태수,이혜문,유지훈,Lee, Dong-Won,Park, Geun-Tae,Lim, Tae-Soo,Lee, Hye-Moon,Yu, Ji-Hun 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.4
Zr-Ti alloy powders were successfully synthesized by magnesium thermal reduction of metal chlorides. The evaporated and mixed gasses of $ZrCl_4+TiCl_4$ were injected to liquid magnesium and the chloride components were reduced by magnesium leading to the formation of $MgCl_2$. The released Zr and Ti atoms were then condensed to particle forms inside the mixture of liquid magnesium and magnesium chloride, which could be dissolved fully in post process by 1~5% HCl solution at room temperature. By the fraction-control of individually injected $ZrCl_4$ and $TiCl_4$ gasses, the final compositions of produced alloy powders were changed in the ranges of Zr-0 wt.%~20 wt.%Ti and their purity and particle size were about 99.4% and the level of several micrometers, respectively.