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Grade II 순수 타이타늄의 단시간 양극산화에 의한 TiO<sub>2</sub> 나노튜브 형성
이광민,김용재,강경호,윤두현,노상현,강석일,유대흥,임현필,윤귀덕,박상원,김현승,Lee, Kwangmin,Kim, Yongjae,Kang, Kyungho,Yoon, Duhyeon,Rho, Sanghyun,Kang, Seokil,Yoo, Daeheung,Lim, Hyunpil,Yun, Kwiduk,Park, Sangwon,Kim, Hyun Seung 한국재료학회 2013 한국재료학회지 Vol.23 No.4
Electrochemical surface treatment is commonly used to form a thin, rough, and porous oxidation layer on the surface of titanium. The purpose of this study was to investigate the formation of nanotubular titanium oxide arrays during short anodization processing. The specimen used in this study was 99.9% pure cp-Ti (ASTM Grade II) in the form of a disc with diameter of 15 mm and a thickness of 1 mm. A DC power supplier was used with the anodizing apparatus, and the titanium specimen and the platinum plate ($3mm{\times}4mm{\times}0.1mm$) were connected to an anode and cathode, respectively. The progressive formation of $TiO_2$ nanotubes was observed with FE-SEM (Field Emission Scanning Electron Microscopy). Highly ordered $TiO_2$ nanotubes were formed at a potential of 20 V in a solution of 1M $H_3PO_4$ + 1.5 wt.% HF for 10 minutes, corresponding with steady state processing. The diameters and the closed ends of $TiO_2$ nanotubes measured at a value of 50 cumulative percent were 100 nm and 120 nm, respectively. The $TiO_2$ nanotubes had lengths of 500 nm. As the anodization processing reached 10 minutes, the frequency distribution for the diameters and the closed ends of the $TiO_2$ nanotubes was gradually reduced. Short anodization processing for $TiO_2$ nanotubes of within 10 minutes was established.
정형환,주석민,이광민 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
This paper proposed a regulation technique of scale factors on fuzzy controller for power system stabilization. These scale factors are regulated by a given exponential function with performance index variables. Simulation results showed that the proposrd fuzzy control technique was more powerful than conventional ones in faces of usefulness and robustness.
이광민,김진천,이재성,김영립 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.2
1980년대 후반부터 집중적으로 연구되어온 기계적 합금화 공정 기술은 이제 단순화합물 조성의 합금화공정 뿐 만아니라 기계화학적(Mechanochemical) 방법으로까지 진보되어 다양한 시스템으로의 응용기술로까지 발전하게 되었다 더욱이 최근 나노기술의 한고상 제조기술로서도 역할을 하게 되는 기계적 합금화 공정 기술은 21세기에 있어서도 본문에서 연급한 바와 같은 고온용 고장도 Al 합금제조 외에도 나노결정립 분말, 자성재료, 에너지전환/저장기능재료, 준결정상제어 분야로서의 무한한 응용 가능성을 기대해 볼 수 있다.
기계적 합금화 방법에 의한 Cu-C계 복합금속분말의 제조 및 미세구조 제어 특성
이광민 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.1
It was investigated whether mechanical alloying (MA) processing could be more effective to the formation of metallic composite powder in Cu-C system. Elemental powder mixtures of Cu-70vo1.%C were mechanically alloyed with an attritor in an argon atmosphere and microstructural evolution was examined by X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy. It has been found that even with the high volume fraction of immiscible graphite in Cu-C system, the refinement with a few ten nanometer size as well as the highly uniform distribution of copper phases have been achieved by the MA processing.