• 제목/요약/키워드: Mechanical and Electrical properties

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시효 열처리에 따른 Cu-Be 합금의 전기.기계적 특성 고찰 (The Influence of Aging Treatment on the Mechanical and Electrical Properties of Cu-Be Alloy)

  • 류민;이병수;정봉용;김명호
    • 한국주조공학회지
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    • 제31권6호
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    • pp.366-370
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    • 2011
  • The influence of aging treatment on the microstructure, mechanical and electrical properties of Cu-Be alloy for connector material applications was investigated. The properties of mechanical strength and electrical conductivity were found to increase with increasing aging temperature. By the way, SEM/EDS and TEM analysis exhibited that beryllides precipitation (CoBe and NiBe) with a size of 50 nm were distributed in grains. It was, therefore concluded that these beryllide precipitates improved the mechanical strength and also it was favor in increasing of electrical conductivity.

Al-10.5wt%Si-2wt%Cu 다이 캐스팅용 2차 지금의 기계적 특성과 전기전도도에 미치는 Sr 양과 유지시간의 영향 II (The Effect of Sr Addition and Holding Time on Mechanical Property and Electrical Conductivity of Al-10.5%Si-2%Cu Secondary Die-casting Alloys)

  • 신상수;김명용;염길용
    • 한국주조공학회지
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    • 제30권6호
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    • pp.205-209
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    • 2010
  • This study evaluates the influence of strontium addition and holding time on mechanical properties for Al-10.5wt%Si-2wt%Cu secondary die-casting alloy and the measured electrical conductivity of modified alloys. A general improvement in the mechanical properties of the alloy was observed after adding the strontium. Ultimate tensile strength, elongation and electrical conductivity of modified alloys were improved by increasing strontium content and holding time. From these results, the optimal strontium content and holding time were identified on the mechanical properties of Al-10.5wt%Si-2wt%Cu secondary die-casting alloys.

탄소나노섬유/PVDF-HFP 복합재로 코팅된 부직포의 역학적 및 전기적 특성 변화 (Mechanical and Electrical Properties of Nonwoven Coated with CNFs/PVDF-HFP Composite)

  • 이선희
    • 한국의류산업학회지
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    • 제13권2호
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    • pp.279-284
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    • 2011
  • In this study, the process of preparation nonwoven with coated carbon nano fibers (CNFs) /poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) composite solution is described. The various contents of CNFs/PVDF-HFP composite coated nonwoven were prepared and characterized by morphological, mechanical, and electrical methods. Nonwovens are coated with CNFs/PVDF-HFP composite solution and decreased the pick up ratio with increasing CNFs contents in range from 0% to 16%. In the results of SEM images, it was clear that the CNFs were evenly distributed in coated nonwoven by SEM images, the existence of CNFs in coated nonwoven was confirmed regularly. The mechanical properties of various contents of CNFs/PVDF-HFP coated nonwoven were examined. The tensile linearity and compression linearity increased with increasing CNFs contents. The electrical properties of the CNFs/PVDF-HFP coated nonwoven increased with increasing CNFs contents.

Effect of ionizing radiation on mechanical and electric properties of polymer composites

  • Soh, Dae-Wha;Kovtunets, V.A.;Kupchishin, A.I.;Mun, G.A.;Nurkeeva, Z.S.;Akhmetkalieva, G.T.;Khutoryanskiy, V.V.
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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    • pp.588-591
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    • 2002
  • Radiation technology is an effective way for regulating polymeric materials to physicochemical and mechanical properties. The effect of radiation on mechanical and electrochemical properties of new rubber-like polymeric composite materials based on poly(vinyl ether of ethyleneglycol : PVEEG) have been studied for investigating mechanical and electric property of polymer composites applications.

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Study on the Preparation Process and Properties of Magnetorheological Fluid Treated by Compounding Surfactants

  • Wu, Xiangfan;Xiao, Xingming;Tian, Zuzhi;Chen, Fei
    • Journal of Magnetics
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    • 제21권2호
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    • pp.229-234
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    • 2016
  • Aiming to prepare high performance magnetorheological fluid, firstly, oleic acid and sodium dodecyl benzene sulfonate are chosen as surfactants. And then, the mechanical stirring process including stirring time, stirring temperature and stirring speed are optimized by measuring sedimentation ratio and zero-field viscosity. Finally, the properties of prepared magnetorheological fluid are elaborated. The results indicate that the compounding of oleic acid and sodium dodecyl benzene sulfonate can improve the properties of magnetorheological fluid distinctively, and the optimistic compounding content is 4g:4g or 5g:5g. The surfactants adding orders and the second stirring time have little effect on the properties of magnetorheological fluid, while obviously of the first stirring time, temperature and speed. Moreover, the sedimentation ratio of prepared magnetorheological fluid is less than 5.2% in two weeks, the zero-field viscosity is smaller than $0.6Pa{\cdot}s$ at $20^{\circ}C$, and the maximum yield stress is higher than 50 kPa.

멜라민 함량에 따른 폴리아세탈의 기계적 특성 변화 (Variation of Mechanical Properties in Polyacetal with Melamine)

  • 박광석;서광석
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1999년도 추계학술대회 논문집
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    • pp.498-500
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    • 1999
  • Polyacetals with melamine were investigated in terms of mechanical properties. It was found that tensile strength, impact strength and elongation were decreased with the increase of melamine content up to 30 par, flexural strength had no remarkable changes. For master-batch using polyurethane as carrier resin, in which the ratio of polyurethane to melamine was 2:1, tensile strength and flexural strength were decreased and impact strength remained unchanged with melamine me content.

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전기전도도를 이용한 Al-Si-Cu-Mg 합금 품의 기계적 압축 특성 평가 (Evaluation of Mechanical Compressive Properties of Al-Si-Cu-Mg Alloy Foams Using Electrical Conductivity)

  • 이창훈;김엄기;하산;남승훈;조성석
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.377-381
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    • 2004
  • Electrical conductivity of Al-Si-Cu-Mg alloy foams of various density produced in powder metallurgical method has been measured using two probe electrical conductivity measurement method. Compressive mechanical properties such as elastic modulus and plastic plateau stress of foams were evaluated from electrical conductivity using power law relation and scaling laws of foam properties. Uni-axial compression test was also performed. Experimentally measured elastic modulus and plastic plateau stress were compared with the values evaluated from electrical conductivity. The computed values were in good agreement with the experimental result.

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Effect of silica fume and polyepoxide-based polymer on electrical resistivity, mechanical properties, and ultrasonic response of SCLC

  • Mazloom, Moosa;Allahabadi, Ali;Karamloo, Mohammad
    • Advances in concrete construction
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    • 제5권6호
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    • pp.587-611
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    • 2017
  • This study focused on the influences regarding the use of polyepoxide-based polymer and silica fume (SF) on the fresh and hardened state properties of self-compacting lightweight concrete (SCLC) along with their impacts on electrical resistance and ultrasonic pulse velocity (UPV). To do so, two series of compositions each of which consists of twelve mixes, with water to binder (W/B) ratios of 0.35 and 0.4 were cast. Three different silica fume/binder ratios of 0, 5%, and 10% were considered along with four different polymer/binder ratios of 0, 5%, 10%, and 15%. Afterwards, the rupture modulus, tensile strength, 14-day, 28-day, and 90-day compressive strength, the UPV and the electrical resistance of the mixes were tested. The results indicated that although the use of polymer could enhance the passing and filling abilities, it could lead to a decrease of segregation resistance. In addition, the interaction of the SF and the polymeric contents enhanced the workability. However, the impacts regarding the use of polymeric contents on fresh state properties of SCLC were more prevalent than those regarding the use of SF. Besides the fresh state properties, the durability and mechanical properties of the mixes were affected due to the use of polymeric and SF contents. In other words, the use of the SF and the polymer enhanced the durability and mechanical properties of SCLC specimens.

SmBCO 고온 초전도 선재의 안정화재 특성 (A study on the properties of SmBCO coated conductors with stabilizer tape)

  • 김태형;오상수;김호섭;고락길;송규정;하홍수;이남진;박경채;하동우
    • 한국초전도ㆍ저온공학회논문지
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    • 제9권3호
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    • pp.9-12
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    • 2007
  • In this study. we searched for the mechanical and electrical properties of laminated coated conductors with stabilizer tape. Stabilizer tape plays a role for mechanical and electrical stability and environmental protection. Cu material stabilizer was laminated to Ag capping layer on SmBCO conductor layer. This architecture allows the wire to meet operational requirements including the stressless at cryogenic temperature and winding tension as well as mechanical bending requirements including thermal and electrical stability under fault current conditions. First, we have experimentally studied mechanical bonding properties of the laminated Cu stabilizers on SmBCO coated conductors. We have laminated SmBCO coated conductors by continuous dipping soldering process, Second, we have investigated electrical properties of the SmBCO coated conductors with stabilizer lamination. We evaluated bonding properties, peeling strength and critical current for laminated SmBCO coated conductors with Cu stabilizers.

에폭시기반 나노와 마이크로 혼합 콤포지트의 열적 그리고 기계적특성 (Thermal and Mechanical Properties for Micro-and-Nano- Mixture Composites Based Epoxy)

  • 오충연;유병복;박재준
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 춘계학술대회 논문집
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    • pp.31-31
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    • 2010
  • Nano particles (10nm $SiO_2$) were silane-treated in order to modify the surface characteristics in a epoxy nanocomposite. Then, micro particles ($3{\mu}m$ SiO2) were poured into the epoxy nanocomposite using various mixing process and epoxy/micro-and-nanomixed composites (EMNC) were prepared. The thermal (Tg) and mechanical (tensile and flexural strength) properties were measured by DSC, DMA and UTM and the data was estimated by Weibull plot.

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