• Title/Summary/Keyword: Aluminum-26

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Fabrication of Carbon Fiber/Aluminum Preforms using Cylindrical Sputtering System (원통형 스퍼터링 장치를 이용한 탄소섬유/알루미늄 프리폼의 제작)

  • Kim, Y.C.;Han, C.S.
    • Journal of the Korean Society for Heat Treatment
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    • v.26 no.2
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    • pp.66-71
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    • 2013
  • The purpose of this study is to prepare a high-strength Fiberglass Reinforced Metal (FRM). Aluminum covering over carbon fibers (CF) was made to increase their wettability to molten aluminum. A cylindrical sputtering apparatus was used for the covering. One tow of carbon fibers was placed along the central axis of the cylindrical target. Aluminum was uniformly coated around the carbon fiber tow. But in case of CF without sizing treatment, aluminum spread into the inside of the tow. Preforms of carbon fiber/aluminum composite were made by impregnating carbon fiber with molten aluminum. Contact angle of molten aluminum to the aluminum-coated carbon fiber was about $30^{\circ}$. The fractured section of preform was observed by SEM, which showed that molten aluminum wetted the outer part of the tow well but had not penetrated into the center, and that adhesion between CF and aluminum matrix was in good condition.

Deposition Behavior and Properties of Carbon Nanotube Aluminum Composite Coatings in Kinetic Spraying Process (탄소 나노튜브 알루미늄 복합재료 저온 분사 코팅의 적층 거동 및 특성)

  • Kang, Ki-Cheol;Xiong, Yuming;Lee, Chang-Hee
    • Journal of Welding and Joining
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    • v.26 no.5
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    • pp.36-42
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    • 2008
  • Carbon nanotube (CNT) aluminum composite coatings were built up through kinetic spraying process. Deposition behavior of CNT aluminum composite on an aluminum 1050 alloy substrate was analyzed based on deposition mechanism of kinetic spraying. The microstructure of CNT aluminum composite coating were observed and analyzed. Also, the electrical resistivity, bond strength and micro-hardness of the CNT aluminum composite coatings were measured and compared to kinetic sprayed aluminum coatings. The CNT aluminum composite coatings have a dense structure with low porosity. Compared to kinetic sprayed aluminum coating, the CNT aluminum composite coatings present lower electrical resistivity and higher micro-hardness due to high electrical conductivity and dispersion hardening effects of CNTs.

An Experiment on Heat Dissipation from Aluminum foam Heat Sinks in an Air Multi-Jet Impingement (다중 충돌 공기제트에서 발포 알루미늄 방열기의 방열 특성 실험)

  • Lee, Myeong-Ho;Kim, Seo-Yeong;Lee, Gwan-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.8
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    • pp.1115-1122
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    • 2002
  • The present experiment investigates the effects of pore density f of aluminum foam heat sinks, the jet-to-jet spacing X and the nozzle plate-to-target surface spacing H of 3$\times$3 square impinging arrays on the averaged Nusselt number. The performance of the aluminum foam heat sinks and the rectangular plate heat sink is evaluated in terms of the enhancement factor. /equation omitted/. The multiple impinging jet with X/d=4.0 displays higher Nusselt numbers than single impinging jet for 12.0$\leq$H/d$\leq$20.0. With the variation of the jet-to-jet spacing, the aluminum foam heat sink of 10 PPI show higher Nusselt numbers than the 20 and 40 PPI aluminum foam heat sinks. Further, the 10 PPI aluminum foam heat sink demonstrates 26% higher enhancement factor than the rectangular plate heat sink in the range of 7000$\leq$Re$\leq$11000.

The Effect of Hot Isostatic Pressing on Mechanical Properties of Cast Aluminum Alloy (주조된 AI 합금의 기계적 성질에 미치는 HIP의 영향)

  • Kim, Gi-Tae;Yang, Hun-Cheol;Choe, Jae-Yun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.461-470
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    • 2002
  • The present paper investigates the effect of hot isostatic pressing (HIPing) on mechanical properties, e.g., tensile strength, ductility and impact absorption energy of sand and die casted aluminum alloys. After HIPing at various temperatures and pressure conditions, uniaxial tensile test and Izod impact test of the samples were carried out. The experimental results showed improvements in uniaxial tensile strength, elongation and Izod impact toughness of sand casted aluminum alloy, while deterioration of a tensile strength fur die casted aluminum alloy. The effect of HIPing for microstructure of the cast aluminum alloy was also investigated.

The Cold Welding Properties for Al Wire of Aged Overhead Conductor (폐가공송전선 Al선재 냉간접합 특성)

  • Kim, Shang-Shu;Ku, Jae-Kwan;Lee, Young-Ho;Kim, Byung-Geol
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.5
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    • pp.415-420
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    • 2013
  • The new recycling technology for aged Aluminum wires in overhead conductor have been carried out. We are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The weld of aged aluminum wires play a vital role in remanufacture process. The paper investigates the mechanical properties during cold welding process of aged Aluminum wire. The tensile tests and microscopic analysis results are discussed to underscore the hardening features of welded aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process.

Aluminum Coating on A12O3 Powders in Fluidized Bed Reactor at Atmospheric Pressure (유동반응관을 이용한 상압에서의 알루미나 분말의 알루미늄 증착)

  • 강창용
    • Journal of Powder Materials
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    • v.1 no.1
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    • pp.21-26
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    • 1994
  • Aluminum was deposited on aluminum oxide powders using a fluidized bed reactor at atmospheric pressure. The aluminum oxide powders were irregular flakes with acute angles and the average particle size was 26 $\mu\textrm{m}$. The fluidized bed was formed by flowing argon gas at the velocity of 60 cm/sec. The optimal fluidization condition was obtained with the reactor designed to be tapered so that the fluid velocity decreases as the fluidizing gas goes up along the reactor. Aluminum was deposited by flowing TiBA(Triisobutylaluminum) evaporated at$250^{\circ}C$ through the fluidized bed reactor heated to 350~$450^{\circ}C$. The result from the analysis by XRD and EDAX confirmed the coating of aluminum and an SEM micrograph showed the conformality.

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A Study on the CFRP Treatment by ion Assisted Reaction Method to Improve T-peel Strength of CFRP/Aluminum Composites (CFRP/알루미늄 복합재에서 이온도움반응법을 적용한 CFRP의 표면처리가 T-peel 강도에 미치는 영향에 대한 연구)

  • Lee, Gyeong-Yeop;Yang, Jun-Ho;Yun, Chang-Seon;Choe, Nak-Sam
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.570-575
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    • 2002
  • It is well-known that the bond strength between CFRP(Carbon Fiber Reinforced Plastic) and aluminum is significantly affected by the surface treatment of the CFRP and the aluminum. This study investigates the surface treatment of CFRP to improve the T-peel strength of CFRP/aluminum composites. The surface of %CFRP([0^0]_{14})$ was treated by the ion assisted reaction method under oxygen environment. T-peel strength tests were performed based on the procedure of ASTM D1876-95. The T-peel strength of surface-treated CFRP/aluminum composites was compared with that of untreated CFRP/aluminum composites. The results showed that the T-peel strength of surface-treated CFRP/aluminum composites was about 5.5 times higher than that of untreated CFRP/aluminum composites. SEM examination showed that the improvement of T-peel strength was attributed to the uniform spread and fracture of epoxy adhesive.

The Recycling Technology for Aged Aluminum Wire in Overhead Conductor (폐가공송전선 Al선재 재활용 기술개발)

  • Kim, Shang-Shu;Ku, Jae-Kwan;Lee, Young-Ho;Kim, Byung-Geol
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.7
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    • pp.555-562
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    • 2013
  • The new recycling technology for aged aluminum wires in overhead conductor has been carried out. The authors are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The new recycling technology for aged aluminum wire in overhead conductor was composed of four steps in different develop process, destranding process for conductor, surface cleaning process, welding process and drawing process for aluminum wire. This paper investigates the properties during recycle process of aged aluminum wire. The results of microscopic analysis and mechanical properties were discussed to underscore recycling aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process. In conclusion, we confirmed the possibility of remanufacturing technique by using new process.

The Drawing Properties of Aluminum Wire in Aged Overhead Conductor (폐가공송전선용 Al선재의 신선가공 특성)

  • Kim, Shang-Shu;Ku, Jae-Kwan;Lee, Young-Ho;Kim, Byung-Geol
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.6
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    • pp.482-487
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    • 2013
  • The new recycling technology for aged aluminum wires in overhead conductor have been carried out. We are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The drawing process of aged aluminum wires play a role in remanufacture process. Drawing process was performed under lubricant. The speed of drawing was between 500 m/min and 1,000 m/min. These machines have 11 or 12 dies house for breakdown of the feedstock. Material of the die is tungsten carbide and they have generally 25% reduction ratio. The paper investigates the mechanical properties during drawing process of aged aluminum wire. The results of tensile tests and microscopic analysis were discussed to underscore the hardening features of drawing aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process.

Analysis of Sliding Wear Properties for Aluminum Alloy According to the Hardness Values of the Mating Tool Steel (알루미늄 합금의 미끄럼마모 특성에 미치는 상대재 경도의 영향)

  • Lee, Han-Young;Cho, Yong-Jae;Kim, Tae-Jun;Park, Won-Kyu
    • Tribology and Lubricants
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    • v.26 no.2
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    • pp.105-110
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    • 2010
  • In order to investigate the wear behavior of aluminum alloy depended on different hardness of the mating tool steel, sliding wear tests were conducted. It was found that the wear characteristics pattern of aluminum alloy for sliding speed was not affected by the hardness of the mating tool steel. However, the effects of the hardness of the mating tool steel exhibited only in relatively low sliding speed ranges. At these ranges, the wear rate of aluminum alloy decreased when increasing the hardness of the mating tool steel. This was attributed by the fact that $Al_2O_3$ particles released from the aluminum worn surface were crushed and embedded on the mating worn surface with high hardness level. At the high sliding speed ranges, wear of aluminum alloy was hardly occurred by the formation of thick $Al_2O_3$ film on the worn surface, regardless of the hardness of the mating tool steel.