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분말사출성형으로 제조된 퍼말로이 연자성체에서 잔류 불순물이 자기특성에 미치는 영향
정원용(Won Young Jeung),최준환(Jun Hwan Choi),정우상(Woo Sang Jung) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.6
The manufacturing method of permalloy soft magnet with the Ni contents of 46.6 and 47.2 wt.% was investigated by powder injection molding technology. The magnetic properties of permalloy were greatly affected on the residual carbon and oxygen content of the sintered magnet. Solvent extraction and thermal debinding process to minimize the residual carbon content in sintered magnet were developed by controlling the debinding atmosphere. The residual carbon content depends on the debinding condition of the binder system for powder injection molding and the residual oxygen content on the sintering atmosphere. The sintered magnet produced by powder injection molding process had a 50 ppm. residual carbon, 150 ppm. residual oxygen. The coercivity and maximum relative permeability of permalloy soft magnet were 0.46 Oe and 14,600 respectively.
전기 도금된 CoFeNi계 박막의 결정크기와 방향성이 자기특성에 미치는 영향
정원용(Won Young Jeung),김현경(Hyun Kyung Kim),박창빈(Chang Bean Park) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.5
CoFeNi alloys are some of the most studied soft magnetic materials because of their superial properties over FeNi alloys as write head core materials in HDD and MEMS. We studied the effect of magnetic property according to size and orientation of crystal for electroplated Co-Fe-Ni alloys. In case of heat treated ternary alloy, it affect the change of crystal size and structure. In this study, it intends to improve the magnetic properties of CoFeNi thin film by heat treatment. Minimized coercivity and increased magnetization are due to heat treatment from 300 ℃ to 400 ℃. As a bcc phase formation, it grow to amount of magnetization.
합금 조성과 전류조건이 CoFeNi 3원계 합금의 자기특성에 미치는 영향
정원용(Won Young Jeung),김현경(Hyun Kyung Kim),이정오(Jeong Oh Lee) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.4
CoFeNi alloys are some of the most studied soft magnetic materials because of their applications as write-head core materials in HDD and MEMS. Ternary CoFeNi films with high saturation magnetic flux density, Bs and low coercivity, Hc were successfully grown by electrodeposition. The optimal composition was Co_(30) Fe_(₃₄) Ni_(36) (at%), and Bs and Hc were 1.9 T and 0.16 A/m, respectively. The XRD and TEM results show that the low Hc of the CoFeNi films was due to very fine crystal particles and mixed fcc and bcc phases.
CoP합금의 전기도금 시 NH<sub>4</sub>Cl의 영향에 관한 연구
이관희,정원용,Lee, Kwan-Hyi,Jeung, Won-Young 한국전기화학회 2002 한국전기화학회지 Vol.5 No.2
본 연구에서는 염화암모늄을 함유한 전해질에서 CoP 자성합금 박막을 전기도금 방식으로 제조하고 염화암모늄의 첨가량이 다른 용액에서의 CV 등 전기화학적인 분석을 통해 핵생성과 결정화(electrocrystallization)에 미치는 영향을 고찰하여 자기적 성질과의 상호관계를 밝히고자 하였다. 용액 중에 첨가된 염화암모늄은 첨가량이 많을수록 분극도를 감소시키고, charge transfer에 의해 electrocrystallization과정을 속도론적으로 제어함으로써 결정립의 크기가 커지고 orientation factor가 증가된다. 이러한 구조적, 결정학적 변화가 CoP 도금층의 자기적 성질을 변화시킴을 관찰하였다. In this study, the effect of ammonium chloride on the electrodeposition of CoP magnetic alloy film was investigated. The correlation between the electrodeposition condition and the magnetic properties was tried to elucidate by the electro- analytical tests such as cyclic voltammetry. It was observed that the magnetic properties of the films were varied extensively with the ammonium chloride contents in the solution. The reason why the magnetic properties of the films were varied with the addition of ammonium chloride was thought that the addition of ammonium chloride controlled the electrocrystallization of CoP kinetically by charge transfer and increased the grain size and the orientation factor. This may cause the variation of the magnetic properties of CoP films.
Laser Surface Texturing을 이용한 STD61강에 대한 마찰특성에 관한 연구
정우영(Woo Young Chung),민준원(Joon Won Min),김상호(Sang Ho Kim),한형욱(Hyung Wook Han),이명호(Meung Ho Rhce),송종호(Jong Ho Song),정원용(Won Young Jeung) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
Laser texturing technology produces shallow dimples that serve as reservoirs for fluid media and trap the wear debris on material faces, so increase the lubrication efficiency of the materials. STD6l steel specimen has been fabricated by using laser texturing method to investigate friction characteristics through gap, depth and diameter. Marking laser system for laser texture showed reasonable results to modify dimple depth and size of steel. On specific lubricant condition. laser textured materials kept longer low friction characteristic than non treated material. After laser texturing, polishing process is positively necessary to remove the spatters attached on the surface. When used on well-controlled dimple surface. the test process results in substantial reductions in friction.
Fe/Ni 합금전착에 의한 다공성 그물군조 방열재료의 제조 연구
이화영,이관희,정원용,Lee, Hwa-Young,Lee, Kwan-Hyi,Jeung, Won-Young 한국전기화학회 2002 한국전기화학회지 Vol.5 No.3
다공성 그물구조 금속을 반도체 칩 방열재료로써 활용하기 위한 실험을 실시하였다. 이를 위해 다공성 그물구조 구리와 반도체 칩 사이의 열팽창 차이를 최소화하기 위한 시도로써 다공성 구리에 대한 Fe/Ni 합금전착을 수행하였다. Fe/Ni 합금전착 실험으로 표준 Hull Cell을 구성하고 전류밀도 분포에 따른 Fe/Ni 합금층 내의 조성변화를 관찰하였으며, 실험결과 합금전착시 이상공석현상으로 인하여 전해액의 교반정도에 따라 합금층 조성이 크게 영향을 받는 것으로 나타났다. 본 실험에서는 paddle type 교반기를 사용하여 전해질의 확산을 제어하는 방법으로 원하는 조성의 Fe/Ni 합금층을 얻을 수 있었으며, 얻어진 Fe/Ni 후막을 대상으로 TMA 열분석을 실시한 결과 구리에 비해 훨씬 낮은 열팽창율을 보이는 것으로 나타났다. 또한, 본 실험에서 Fe/Ni 합금전착을 통하여 제작한 다공성 그물구조 금속을 대상으로 방열성능을 측정한 결과 구리 평판 대비 최대 2배 이상의 방열성능을 보여 반도체 칩 방열재료로의 활용 가능성을 높여 주었다. An attempt was made for the application of porous reticular metal to a heat dissipation material in semiconductor process. For this aim, the electrodeposition of Fe/Ni alloy on the porous reticular Cu has been performed to minimize the thermal expansion mismatch between Cu skeleton and electronic chip. Preliminary tests for the electrodeposition of Fe/Ni alloy layer were conducted by using standard Hull Cell to examine the effect of current density on the composition of alloy layer. It seemed that mass transfer affected significantly the composition of Fe/Ni layer due to anomalous codeposition in the electrodeposition of Fe/Ni alloy. A paddle type stirring bath, which was employed to control the mass transfer of electrolyte in the work, was found to allow the electrodeposition Fe/Ni with a precise composition. result showed that the thermal expansion of Fe/Ni alloy layer was much lower than that of pure copper. From the tests of heat dissipation by using the apparatus designed in the work the heat dissipation material fabricated in the work showed the excellent heat dissipation capacity, namely, more than two times as compared to that of pure copper plate.
Al 양극산화에 의한 나노선재용 AAO template제조
이관희,이화영,정원용,Lee Kwan Hyi,Lee Hwa Young,Jeung Won Young 한국전기화학회 2001 한국전기화학회지 Vol.4 No.2
황산 전해질에서 고순도의 알루미늄 판재를 양극산화 시켜 이방성이 큰 나노기공을 보유한 AAO를 제조하였다. 나노선재를 제조하기 위한 template재료로서 가장 적합한 AAO를 제조하기 위해 AAO의 나노기공의 크기와 분포 등에 영향을 미치는 양극산화 변수의 영향을 조사하였다. 제조된 AAO의 SEM관찰을 통해 나노기공의 직경과 분포를 확인할 수 있었고, AAO를 template로 사용하여 교류 전주법으로 제조한 Fe 나노선재를 TEM 관찰하여 나노기공의 길이와 내부 표면상태를 확인하였다. AAO를 SEM으로 확인한 결과 전해질의 온도나 양극산화 전압 등의 변수에 따라 기공의 크기와 분포의 변화가 분명하게 관찰되었으며, 제조된 나노선재는 평균 길이 $10{\mu}m,\;300\~1000$범위의 종횡비를 갖고 있음이 TEM으로 확인되었다. AAO template having nano scale pores of high aspect ratio has been prepared through anodizing of aluminum foil in sulfuric acid electrolyte. The effect of anodizing parameters on the pore size and distribution was also examined to obtain the proper AAO as a template material of nanowire. The surface of AAO template prepared was observed by SEM to examine the mean size and distribution of pores generated by the anodizing and Fe nanowires obtained by AC electroforming using AAO template were also observed with TEM to determine the length and shape of them. From the results of work, it was found that the mean size or distribution of pores was influenced significantly by the anodizing parameters such as voltage and temperature of electrolyte. Mean length and aspect ratio of Fe nanowires prepared in the work were found to be $10{\mu}m\;and\;300\;to\;1,000$, respectively.