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MA/SPS 공정에 의한 β-FeSi<sub>2</sub> 열전재료의 제조(I) -β-FeSi<sub>2</sub>상의 형성-
김환태,권영순,이충효,Kim, Hwan-Tae,Gwon, Yeong-Sun,Lee, Chung-Hyo 한국재료학회 2002 한국재료학회지 Vol.12 No.3
Fabrication of ${\beta}-FeSi_2$ was attempted by making use of the combined process of mechanical alloying (MA) and spark plasma sintering (SPS). MA was performed under the Ar gas atmosphere using mixed powders of pure iron and silicon having the mole fraction of 1:2. SPS process was performed at 800-85$0^{\circ}C$ with the applied pressure of 50MPa and the holding time was ranging from 0 to 30min. The mechanically alloyed powder by cyclic operation of rotor for 15hrs consisted of $\varepsilon$-FeSi and Si phases. When this mechanically alloyed powder was sintered by SPS process above 85$0^{\circ}C$, $\varepsilon$-FeSi and ${\alpha}-Fe_2Si_5$ phase were formed. Bulk product sintered at 82$0^{\circ}C$ for 30min consisted of ${beta}-FeSi_2$ phase with a small fraction of $\varepsilon$-FeSi and the density of sintered specimen was 75.3% theoretical density. It was considered that the MA/SPS combined process was effective for the preparation of ${\beta}-FeSi_2$ without heat treatment process after sintering.
김환태(Hwan Tae Kim),길상철(Sang Cheol Kil) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.2
The trend of the plasma cutting and laser cutting technology of metal alloys including high strength steel, aluminum alloys for the welding structures has been studied. The high-precision plasma systems offer a denser, higher energy arc that in effect produces a sharper cutting tool and high quality cutting products. The high-quality fiber laser systems with compact design and easy set-up make it ideal for cutting in the pipeline or steel structre manufacturing. This paper covers the scientometric analysis of the high efficient cutting technology which are based on the published research works in the ‘plasma and laser’, and ‘cutting technology’ obtained from Web of Science, and deals with the details of the background data of the plasma cutting and laser cutting technology.
김환태(Hwan Tae Kim),신형규(Hyoung Gyu Shin),표지수(Ji Soo Pyo),김규환(Gyu Hwan Kim),류승환(Seong Hwan Ryoo),이상혁(Sang Hyuk Lee),설상영(Sang Yung Seol),정정명(Jung Myung Chung),최하진(Ha Jin Choi) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.4
The multiple gastric cancer have several clinicopathological characteristics which differ from those of patients with solitary cancer,' in particular, elderly men had a relatively high in- cidence of multiple cancer and early cancer of the elevated, well differentiated type was most common. A careful preoperative evaluation with both radiography and endoscopy enables de- tection of about 70% of synchronous EGC, and perhaps increased awareness of this phenome- non can lead to better results. We reported on a case of synchronous EGC type I and Iia origi- nating from lower body and antrurn.(Korean J Gastroenterol 1994; 26: 737 741)
자동차 경량화를 위한 알루미늄 합금의 강변형 가공 및 고능률 용접기술에 관한 동향
김환태(Hwan Tae Kim),길상철(Sang Cheol Kil) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.4
The trend of the fabrication technology of high strength, high toughness aluminum alloys by the severe plastic deformation(SPD) process and the welding technology of lightweight alloys in the automobile has been studied. The lightweight aluminum alloys can reduce vehicle weight, while stringently demanding the high quality and efficient welding techniques, to produce the best weldments. Among the production technologies, welding plays an important role in the fabrication of lightweight vehicle structure. This paper covers the scientometric analysis of the severe plastic deformations of lightweight alloys and the welding technology in the automobile which are based on the published research works in the ‘HPT, ECAP and rolling’, and ‘welding technology of the automobile’ obtained from Web of Science, and deals with the details of the background data of the HPT, ECAP, and rolling of lightweight alloys, and welding technology of the automobile technology.