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PVD법에 의해 제작한 Al-Mg 코팅 강판의 내식성에 미치는 Mg 함량 및 열처리의 영향
강재욱(Jae Wook Kang),박준무(Jun-Mu Park),황성화(Sung-Hwa Hwang),이승효(Seung-Hyo Lee),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
This study was intended to investigate the effect of the amount of magnesium addition and heat treatment in the Al-Mg coating film in order to improve corrosion resistance of aluminum coating. Al-Mg alloy films were deposited on cold rolled steel by physical vapor deposition sputtering method. Heat treatment was fulfilled in an nitrogen atmosphere at the temperature of 400°C for 10 min. The morphology was observed by SEM, component and phase of the deposited films were investigated by using GDLS and XRD, respectively. The corrosion behaviors of Al-Mg films were estimated by exposing salt spray test at 5 wt.% NaCl solution and measuring polarization curves in deaerated 3 wt.% NaCl solution. With the increase of magnesium content, the morphology of the deposited Al-Mg films changed from columnar to featureless structure and particle size was became fine. The x-ray diffraction data for deposited Al-Mg films showed only pure Al peaks. However, Al-Mg alloy peaks such as Al₃Mg₂ and Al12Mg17 were formed after heat treatment. All the sputtered Al-Mg films obviously showed good corrosion resistance compared with aluminum and zinc films. And corrosion resistance of Al-Mg film was increased after heat treatment.
해양환경 중 음극전류 프로세스에 의해 강판에 형성된 석회질 피막의 특성 분석
박준무(Jun-Mu Park),강재욱(Jae Wook Kang),최인혜(In-Hye Choi),이승효(Seung-Hyo Lee),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
Cathodic protection is widely recognized as the most cost effective and technically appropriate corrosion prevention methodology for the port, offshore structures, ships. When applying the cathodic protection method to metal facilities in seawater, on the surface of the metal facilities a compound of calcium carbonate(CaCO₃) or magnesium hydroxide(Mg(OH)₂) films are formed by Ca<SUP>2+</SUP> and Mg<SUP>2+</SUP> ions among the many ionic components dissolving in the seawater. And calcareous deposit films such as CaCO₃ and Mg(OH)₂ etc. are formed by the surface of the steel product. These calcareous deposit film functions as a barrier against the corrosive environment, leading to a decrease in current demand. On the other hand, the general calcareous deposit film is a compound like ceramics. Therefore, there may be some problems such as weaker adhesive power and the longer time of film formation uniting with the base metal. In this study, we tried to determine and control the optimal condition through applying the principle of cathodic current process to form calcareous deposit film of uniform and compact on steel plate. The quantity of precipitates was analyzed, and both the morphology, component and crystal structure were analyzed as well through SEM, EDS and XRD. And based on the previous analysis, it was elucidated mechanism of calcareous deposit film formed in the sacrificial anode type (Al, Zn) and current density (1, 3, 5 A/㎡) conditions. In addition, the taping test was performed to evaluate the adhesion.
비정질 IZO 애노드를 이용한 형광 유기발광소자의 특성
문종민,배정혁,정순욱,강재욱,김한기,Moon, Jong-Min,Bae, Jung-Hyeok,Jeong, Soon-Wook,Kang, Jae-Wook,Kim, Han-Ki 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11
We reported on characteristics of the fluorescent OLED fabricated on commercial ITO/glass and BCS grown IZO/glass substrate, respectively. The amorphous IZO anode film grown by box cathode sputtering(BCS) exhibited similar electrical and optical characteristics to commercial ITO anode even though it was deposited at room temperature. In addition, the amorphous IZO anode showed higher workfunction (5.2 eV) than that of the commercial ITO anode (5.0 eV) after ozone treatment for 10 min. Furthermore, fluorescent OLED fabricated on amorphous IZO anode film showed improved current-voltage-luminance characteristics, external quantum efficiency and power efficiency en contrast with fluorescent OLED fabricated on commercial ITO anode film. It was thought that smooth surface and high workfunction of amorphous IZO anode lead to more efficient hole injection by reduction of interface barrier height between anode and organic layers.
세라믹/금속접합재의 고온 열사이클에 따른 잔류응력분포 및 굽힘강도 특성
박영철,허선철,부명환,김현수,강재욱,Park, Young-Chul,Hue, Sun-Chul,Boo, Myoung-Hwan,Kim, Hyun-Su,Kang, Jae-Wook 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
Since the ceramic/metal joint material is made at a high temperature, the residual stress develops when it is cooled from bonding temperature to room temperature due to remarkable difference of thermal expansion coefficient between ceramic and metal. As residual stress at ceramic/metal joints influences the strength of joints, it is important to estimate residual stress quantitatively. In this study, it is attempted to estimate joint residual stress of Si$_3$N$_4$STS304 joints quantitatively and to compare the strength of joints. The difference of residual stress is measured when repeated thermal cycl is loaded, under the conditions of the practical use of the ceramic/metal joint. The residual stress increases at 1 cycle of thermal load but decreases in 3 cycles to 10 cycles of thermal load. And 4-point bending test is performed to examine the influence of residual stress on fracture strength. As a result, it is known that the stress of joint decreases as the number of thermal cycle increases.
아르곤 가스만을 이용하여 PES 기판 상에 성장시킨 플렉시블 유기발광소자용 비정질 IZO 애노드 박막의 특성
배정혁,문종민,정순욱,강재욱,김한기,Bae, Jung-Hyeok,Moon, Jong-Min,Jung, Soon-Wook,Kang, Jae-Wook,Kim, Han-Ki 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12
Electrical, optical, and structural properties of indium zinc oxide (IZO) anode films grown by a RF magnetron sputtering were investigated as functions of RF power and working pressure in pure Ar ambient. To investigate electrical, optical and structural properties of IZO anode films, 4-point probe and UV/VIS spectrometry, and X-ray diffraction (XRD) were performed, respectively. A sheet resistance of $15.2{\Omega}/{\square}$, average transmittance above 80 % in visible range, expecially above 85 % in 550 nm, and root mean square roughness of 1.13 nm were obtained from optimized IZO anode films grown in oxygen free ambient. All samples show amorphous structure regardless of RF power and working pressure due to low substrate temperature. In addition, XPS depth profile obtained from IZO/PES exhibits that there is no obvious evidence of interfacial reaction between IZO and PES substrate. Furthermore, current-voltage-luminance of the flexible phosphorescent flexible OLEDs fabricated on IZO anode shows dependence on sheet resistance of the IZO anode. These results indicate that the IZO anode is a promising candidate to substitute conventional ITO anode for high-quality flexible displays.
비정질 IZO 애노드 박막을 이용한 유기물 플렉서블 디스플레이의 상온 제작
문종민,배정혁,정순욱,박노진,강재욱,김한기,Moon, Jong-Min,Bae, Jung-Hyeok,Jeong, Soon-Wook,Park, No-Jin,Kang, Jae-Wook,Kim, Han-Ki 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.7
We report on the fabrication of organic-based flexible displays using an amorphous IZO anode grown at room temperature. The IZO anode films were grown by a conventional DC reactive sputtering on the polycarbonate (PC) substrate at room temperature using a synthesized IZO target in a $Ar/O_2$ ambient. Both x-ray diffraction (XRD) and high resolution electron microscope (HREM) examination results show that the IZO anode film grown at room temperature Is complete amorphous structure due to low substrate temperature. A sheet resistance of $35.6\Omega/\Box$, average transmittance above 90 % in visible range, and root mean spare roughness of $6\sim10.5\AA$ were obtained even in the IZO anode film grown on PC substrate at room temperature. It is shown that the $Ir(ppy)_3$ doped flexible organic light emitting diode (OLED) fabricated on the IZO anode exhibit comparable current-voltage-luminance characteristics as well as external quantum efficiency and power efficiency to OLED fabricated on conventional ITO/Glass substrate. These findings indicate that the IZO anode film grown on PC substrate is a promising anode materials for the fabrication of organic based flexible displays.