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레이저 클래딩법을 이용한 AISI 316L 스테인리스강 내 Y<sub>2</sub>O<sub>3</sub>입자의 분산거동
박은광,홍성모,박진주,이민구,이창규,설경원,이양규,Park, Eun-Kwang,Hong, Sung-Mo,Park, Jin-Ju,Lee, Min-Ku,Rhee, Chang-Kyu,Seol, Kyeong-Won,Lee, Yang-Kyu 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
The present work investigated the dispersion behavior of $Y_2O_3$ particles into AISI 316L SS manufactured using laser cladding technology. The starting particles were produced by high energy ball milling in 10 min for prealloying, which has a trapping effect and homogeneous dispersion of $Y_2O_3$ particles, followed by laser cladding using $CO_2$ laser source. The phase and crystal structures of the cladded alloys were examined by XRD, and the cross section was characterized using SEM. The detailed microstructure was also studied through FE-TEM. The results clearly indicated that as the amount of $Y_2O_3$ increased, micro-sized defects consisted of coarse $Y_2O_3$ were increased. It was also revealed that homogeneously distributed spherical precipitates were amorphous silicon oxides containing yttrium. This study represents much to a new technology for the manufacture and maintenance of ODS alloys.
초기 항공사진의 기술사회 네트워크 : 조지 로렌스의 샌프란시스코 대지진 사진을 중심으로
박은광 ( Eun-kwang Park ),오준호 ( Junho Oh ) 현대사진영상학회 2018 현대사진영상학회논문집 Vol.21 No.1
recording of facts as well as technical and social conditions. This paper aims to show the networks of technology and society recorded in one Aerial Photography of George Lawrence’s < San Francisco in Ruins >. The structure of this paper is as follows. Chapter 1 shows the stages of professionalization and commercialization of photo studios through George Lawrence’s activities. Chapter 2 describes the process of accumulation of aerial photography technology history to Lawrence and the process of aerial photography technology being appropriated from the initial aim to the new purpose. Chapter 3 explains how George Lawrence’s studio was specialized based on industrial background at that time. Lastly, in Chapter 4, we will see the process of the government and academia taking notice of aerial photographs as a record tool for historical events and the improvement of the photographs through the government’s request for official records besides industrial demand. Based on this, we will investigate the formation process of media and the meaning that aerial photographs have as hybrid networks creatures.
박은광 ( Eun Kwang Park ),이만형 ( Man Hyung Lee ),우태규 ( Tae Gyu Woo ),박일송 ( Il Song Park ),정광희 ( Kwang Hee Jung ),설경원 ( Kyeong Won Seol ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.11
The purpose of this study is to identify the effect of electrolyte compositions on electrodeposited copper foil. First of all, the polyimide substrate was pretreated with plasma. Finally, copper foil was deposited on a Cu/Ni/Polyimide substrate using the electroplating technique. As the quantity of Cu increased, preferred orientations changed into (111). Increasing sulfuric acid, on the other hand, brought down the preferred orientation of (111). The lowest sheet resistance, surface roughness, and fine adhesion were detected when the ratio of Cu2+ and H2SO4 is 50:50(g/l).
밀링 에너지 변화에 따른 TiC 분말의 미세화 거동에 관한 정량적 연구
홍성모,박은광,김경열,박진주,이민구,이창규,이진규,권영순,Hong, Sung-Mo,Park, Eun-Kwang,Kim, Kyeong-Yeol,Park, Jin-Ju,Lee, Min-Ku,Rhee, Chang-Kyu,Lee, Jin-Kyu,Kwon, Young-Soon 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.1
This study investigated refinement behaviors of TiC powders produced under different impact energy conditions using a mechanical milling process. The initial coarse TiC powders with an average diameter of 9.3 ${\mu}m$ were milled for 5, 20, 60 and 120 mins through the conventional low energy mechanical milling (LEMM, 22G) and specially designed high energy mechanical milling (HEMM, 65G). TiC powders with angular shape became spherical one and their sizes decreased as the milling time increased, irrespective of milling energy. Based upon the FE-SEM and BET results of milled powders, it was found initial coarse TiC powders readily became much finer near 100 nm within 60 min under HEMM, while their sizes were over 200 nm under LEMM, despite the long milling time of up to 120 min. Particularly, ultra-fine TiC powders with an average diameter of 77 nm were fabricated within 60 min in the presence of toluene under HEMM.
기계적 밀링 공정에 의해 제조된 Al-B<sub>4</sub>C 복합분말의 밀링 거동 연구
홍성모,박진주,박은광,이민구,이창규,김주명,이진규,Hong, Sung-Mo,Park, Jin-Ju,Park, Eun-Kwang,Lee, Min-Ku,Rhee, Chang-Kyu,Kim, Ju-Myoung,Lee, Jin-Kyu 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.4
In the present work, Al-$B_4C$ composite powders were fabricated using a mechanical milling process and its milling behaviors and mechanical properties as functions of $B_4C$ sizes ( $100{\mu}m$, 500 nm and 50 nm) and concentrations (1, 3 and 10 wt.%) were investigated. For achieving it, composite powders and their compacts were fabricated using a planetary ball mill machine and magnetic pulse compaction technology. Al-$B_4C$ composite powders represent the most uniform dispersion at a milling speed of 200 rpm and a milling time of 240 minutes. Also, the smaller $B_4C$ particles were presented, the more excellent compositing characteristics are exhibited. In particular, in the case of the 50 nm $B_4C$ added compact, it showed the highest values of compaction density and hardness compared with the conditions of $100{\mu}m$ and 500 nm additions, leading to the enhancement its mechanical properties.
논문 : 티타늄 음극기지의 양극산화 전해질 농도에 따른 구리전착층 표면 및 전기적 특성에 미치는 효과
이만형 ( Man Hyung Lee ),박은광 ( Eun Kwang Park ),우태규 ( Tae Gyu Woo ),박일송 ( Il Song Park ),윤영민 ( Young Min Yoon ),설경원 ( Kyeong Won Seol ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.11
Recently, the requirement for the ultra thin copper foil increases with smaller and miniaturized electronic components. Therefore, it is important to examine the surface state of substrate depending on the processing parameter during the anodic oxidation. This study investigated the effect of the various electrolyte concentrations on anodizing of titanium anode prior to copper electrodeposition. Different surface morphology of anodized titanium was obtained at different electrolytic concentration 0.5 M to 3.0 M. In addition, the effect that the surfaces and the electrical characteristics on the electrodeposited copper layer was observed. In this study, surface anodized in the group containing 0.5M H2SO4 shows more uniform copper crystals with low surface roughness. the surface roughness and sheet resistance for 0.5M H2SO4 group were 1.353 μm and 0.104 mΩ/sq, respectively.
우태규 ( Tae Gyu Woo ),박일송 ( Il Song Park ),박은광 ( Eun Kwang Park ),정광희 ( Kwang Hee Jung ),이현우 ( Hyun Woo Lee ),설경원 ( Kyeong Won Seol ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
The effects of additives on the surface morphology and physical properties of copper electrodeposited on polyimide(PI) film were investigated here. Two kinds of additives, an activator(additive A) and a leveler(additive B), were used in this study. Electrochemical experiments, in conjunction with scanning electron microscopy(SEM), X-ray diffraction(XRD) and a four-point probe, were performed to characterize the morphology and mechanical characteristics of copper electrodeposited in the presence of the additives. The surface roughness, crystal growth orientation and resistivity could be controlled using various quantities of additive B. High resistivity and lower peel strength were observed on the surface of the copper layer electroplated onto the electrolyte with no additive B. However, a uniform surface, lower resistivity and high flexibility were obtained with a combination of 20 ppm of additive A and 100 ppm of additive B.
우태규 ( Tae Gyu Woo ),박일송 ( Il Song Park ),전우용 ( Woo Yong Jeon ),박은광 ( Eun Kwang Park ),정광희 ( Kwang Hee Jung ),이현우 ( Hyun Woo Lee ),이만형 ( Man Hyung Lee ),설경원 ( Kyeong Won Seo ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.10
This study examined the effect of copper and sulfuric acid concentrations on the surface morphology and physical properties of copper plated on a polyimide (PI) film. Electrochemical experiments with SEM and a four-point probe were performed to characterize the morphology and mechanical characteristics of copper electrodeposited in the composition of an electrolyte. The resistivity and peel strength were controlled using a range of electrolyte compositions. A lower resistivity and high flexibility were obtained when an electrolyte with 20 g/l of copper was used. However, a uniform surface was obtained when a high current density that exceeded 20 mA/cm² was applied, which was maintained at copper concentrations exceeding 40 g/l. Increasing sulfuric acid to >150 g/l decreased the peel strength and flexibility. The lowest resistivity and fine adhesion were detected at a Cu2+: H2SO4 ratio of 50:100 g/l.