• Title, Summary, Keyword: 알루미늄 튜브

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Growth of carbon nanotubes on AAO nanotemplate (양극산화 알루미늄 템플레이트를 이용한 탄소나노튜브의 성장)

  • Choi, Sung-Hun;Lee, Jae-Hyeung;Choi, Won-Seok;Hong, Byung-You
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.146-147
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    • 2006
  • 본 논문에서 탄소나노튜브의 성장 제어를 위해 양극산화 알루미늄 템플레이트를 사용하였다. Si 기판위에 TiN과 Ni 층을 순서대로 증착하였으며 알루미늄을 그 위에 증착하였다. 또한 양극산화 과정은 수산법을 이용하였고 탄소나노튜브의 성장은 마이크로웨이브 플라즈마 화학기상증착법을 이용하여 성장하였다. 양극산화 알루미늄 층 과 탄소나노튜브의 관찰을 위해서 FE-SEM 을 사용하였으며 성장된 탄소나노튜브의 직경은 40 nm 이고 길이는 약 $1\;{\mu}m$ 내외로 확인되었다.

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스퍼터링 방법을 이용한 사극 자석 진공용기 시제품 제작

  • Na, Dong-Hyeon;Park, Jong-Do;Ha, Tae-Gyun
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.259-259
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    • 2013
  • 4세대방사광 가속기의 언듈레이터 사이에 설치되는 사극자석 진공용기는 내경 12 mm, 길이 300 mm인 매우 얇고 긴 형태로 제작되어야 하며, 비자성체이면서 전기 전도도와 내부 표면 거칠기 또한 우수하여야 한다. 스테인리스강 316 L EP 튜브는 비자성체로써 기계가공성 및 내부 표면 거칠기가 우수하다. 또한 내부에 DC Magnetron Sputtering을 통하여 알루미늄 층을 형성함으로써 높은 전기 전도도를 확보할 수 있다. 여기서는 스테인리스강 316 L EP 튜브를 이용하여 손쉽게 사극 자석 진공용기를 제작한 후, Cylindrical Magnetron Sputtering System을 구성하여 내부에 균일한 알루미늄 층을 증착하는 공정에 대해 설명하려고 한다. 또한 치밀한 알루미늄 산화막을 형성하는 공정에 대하여 현재까지 수행한 결과를 정리하여 보고하며 앞으로의 개발 과정도 다루고자 한다.

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The effects of non-condensable gas on condensation heat transfer on a super-hydrophobic surface tube (초소수성 코팅 튜브에서의 비응축가스 영향에 대한 응축 열전달 연구)

  • Ji, Dae-Yun;Kim, Daeho;Lee, Kwon-Yeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.4
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    • pp.517-524
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    • 2018
  • This purpose of this research is to observe the influence of non-condensable gas (NCG) on a horizontal super-hydrophobic aluminum tube and compare it with a bare aluminum tube. To achieve super-hydrophobic characteristics, an aluminum tube was coated with a Self-Assembled Monolayer (SAM). The overall heat transfer coefficient U was used to represent the condensation performance. The NCG mass fraction was the main variable, and its range was 0.08 to 0.45. The condensation performance of the SAM tube and bare tube increased with decreasing mass fraction of NCG. The SAM tube showed 1.9 to 2.5 times larger dropwise condensation performance than the bare tube. When the mass fraction of NCG decreased in the SAM tube, the rate of increase of the SAM tube was lower because flooded condensation occurred. In addition, filmwise condensation occurred in the SAM tube when more active condensation was generated, and its performance was lower than that of the bare aluminum tube. The flooded and filmwise condensation in the SAM tube is explained by the pinning effect. In conclusion, controlling the condition of the condenser is necessary to improve the condensation performance by surface modification a SAM.

The New Aluminum Development for Condenser Tube (Condenser Tube용 신알루미늄합금 개발)

  • Kim, Shang-Shu;Koo, Jae-Kwan;Kim, Byumg-Geol
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.44-44
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    • 2010
  • 냉방기기의 고성능소형화를 촉진시키기 위해서는 고강도 고열전도성 알루미늄합금소재의 개발이 시급하다. Condenser용 튜브부품은 향후 더욱 소형화, 경량화 하는 방향으로 전개되며, 결국 목표로 하는 컨덴서용 튜브 소재적인 측면에서의 기능은 고강도, 고열전도, 압출성이 우수하여야 한다.

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Investigation of Cell Size Effects of Honeycomb Sandwich Composite Square Tubes Under Compressive Loadings (허니콤 샌드위치 복합소재 정사각 튜브의 셀 크기에 따른 압축거동평가)

  • Kim, Jung-Seok;Yoon, Hyuk-Jin;Kwon, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.31-36
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    • 2010
  • The objective of this study is to evaluate effects of honeycomb cell size for compressive behaviors of square sandwich composite tubes with woven fabric carbon/epoxy skin and Al honeycomb core. In order to achieve these goals, four different kinds of tubes were fabricated and compressed to 200mm~250mm under quasi-static load of 10mm/min. The Al honeycombs with cell size of 6.35mm and 9.53mm were used. The relationship of mean compressive load and cell size was evaluated. In addition, the effect of peel strength and equivalent elastic modulus in ribbon direction for the mean compressive load was investigated.

Comparison of Heat Transfer Performance and Pressure Drop of Fin-Tube and Aluminum Heat Exchangers (핀-튜브 열교환기와 알루미늄 열교환기의 전열성능과 압력강하 특성비교)

  • Chang, Keun-Sun;Lee, Hyun-Su;Kim, Jae-Duck
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.2
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    • pp.222-229
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    • 2009
  • This study presents comparison of heat transfer and air side friction characteristics in a condenser condition of air conditioner between Louver fin-tube heat exchangers and aluminum parallel heat exchangers. All experiments are performed using an air-enthalpy type calorimeter, which is designed based on the method described in ASHRAE standards. The air velocities crossing the heat exchanger tubes are varied from 0.7 to 1.6 m/s with 0.3 m/s interval, maintaining air dry temperature and relative humidity at $20^{\circ}C$ and 60% respectively. Water temperature and flow rate inside the tube are $70^{\circ}C$ and 10 LPM, respectively. Experimental results show that the heat transfer performances of aluminum heat exchangers are 17-163% higher than those of Louver fin-tube heat exchangers based on the data per unit volume, mass, and heat transfer area, whereas air side pressure drops of aluminum heat exchangers are 19-81% lower.

Forming Limit Diagram of an Aluminum Tube from Hydroforming tests (액압성형 시험을 통한 알루미늄 튜브 재료의 성형한계도)

  • Kim J. S.;Lee J. K.;Park J. Y.;Lee D. J.;Kim H. Y.;Kim H. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.253-257
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    • 2005
  • A tube hydroformability testing system was designed and fabricated so as to observe the forming process and to apply forming condition along arbitrarily pre-programmed internal pressure-axial feed path. The forming limit diagram of A6063 extruded tube, of 40.6 mm outer diameter and 2.25 mm thickness, was successfully obtained through free bulging and T-forming tests except the region of high positive minor strain. It is found that the data points marked on the FLD are mostly located near the strain paths from the finite element analysis excluding the cases of large axial feed. There exist data points even in the area beyond the uniaxial tension mode, since the reduction in thickness decreases due to the axial feed. The forming limit from T-forming test was considerably lower than that from free bulge test. It seems because the deformation is localized at the pole.

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