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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),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)
HPT 가공기술을 이용하여 초미세립 금속재료를 개발하는 연구기관별 경쟁력 분석에 관한 연구
김환태(H. T. Kim),남수우(S.W. Nam),길상철(S.C. Kil) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
The increasing interest in the severe plastic deformation to conventional coarse-grained metals is placing stringent demands on the manufacturing techniques and performance requirements, and the engineer employs the high quality and efficiency processing technology for producing ultrafine grained materials. This paper covers recent research trends of the high pressure tortion technology of the metals and alloys including the SCI-E analysis of published papers, research subjects and research institute analysis.
김환태(H. T. Kim),길상철(S. C. Kil) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
The increasing interest in the hot cracking behavior of the high temperature alloy weldment is placing stringent demands on the manufacturing techniques and performance requirements, of the manufacture employs the high quality and efficiency high temperature alloy welding technology. This paper covers recent research trends of the hot cracking behavior of the high temperature alloy weldment including SCI-E analysis of published papers, research subjects and research institute analysis.
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.