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문헌정보 분석을 통한 탄소나노튜브 기술 개발 동향 분석(Ⅰ)
홍태환 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.4
The current status of rsearch and development on the nanotechnologies are reviewed by using literature information analysis.
문헌정보 분석을 통한 탄소 나노 튜브 기술 개발 동향 분석(Ⅱ)
홍태환 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.4
The current status of research and development on the nanotechnologies are reviewed by using literature information analysis. Especially, carbon nanotube(CNT) is one of the most important advanced materials for nanotechnology. Because of the extremely small dimensions, a large volume fraction of the carbon atoms are formed to the tubes-single or multi wall tube-, and this confers special attributes to these materials. The CNT appears to be a great potential for applications, such as emitter, field emission display(FED), secondary battery electrode, fuel cell, atomic force microscopy(AFM)/scanning tunneling microscopy(STM) tip, ultra small diodes, hydrogen storage cell, gas sensors, microwave devices, nano capsule, oil absorbers, nano composites, etc… in the near future for CNTs.
Plasma 분체육성용접법 (粉體肉盛熔接法) 에 의한 Al 합금의 표면후막 경화기술 개발
홍태환,문정훈,서창제,중전일박,송전복구 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.12
A new Plasma Transferred Arc(PTA) hardfacing process has been developed to obtain an overlay weld metal having excellent wear resistance. Effect of Ti, Ni and Cu metal powders addition on the surface characteristics of Aluminum alloy 5083 has been investigated with PTA process. Optimum overlaying condtions under which bead appearance is superior and porosities in overlaid metal are lesser are determined. This paper describes the results of tests on the performance of the overlay weld metal. The results are as fallow: (1) The mean hardness of the overlay weld metal is adjustable from Hv200 to Hv600 by PTA process. (2) Concerning defect of overlaid metals, blow holes were seen in Ni and Ti addition. Residual gas contents in blow hole for overlaid metals were confirmed as mainly H₂and a little of N₂. (3) The welding performance of this process is improved by use of DCRP plasma arc, which performs cleaning action on the base metal and weld metal. These results is an increase in welding efficiency. (4) The results of wear tests show that the weld metal has high wear resistance by the PTA process.
알루미늄 발포용 TiH2/TiH2-Al의 제조와 수소화 특성 평가
홍태환,조경원,권순용,김일호,이정일,어순철,이영근,류성림 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.3
A number of potential applications of aluminum foams are being identified and renewed interest in these engineering materials is also reflected by several current research projects. One of the key issues for industrial exploitation of aluminum foams is the development of cost-effective manufacturing strategies facilitating, preferably, net shape production of foams with controlled porosity and cell size, and minimized structural imperfection. Especially, melt route to aluminum foam production based on the foaming agents offer attraction of low cost and the potential for good microstructure. The present paper is focused mainly on foaming agents of melt-foam aluminum such as TiH2 or TiH2-Al mixture. For the purpose of economical manufacturing, we are proposed to hydrogen induced mechanical alloying (HIMA) process. Thermo-physical properties of particles synthesized are compared with conventional methods. Specimens synthesized are characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), thermo- gravimetry-differential scanning calorymetry (TG-DSC), pressure-composition-isotherm. (PCI)