• 제목/요약/키워드: Ni-Cu alloy

검색결과 312건 처리시간 0.023초

알루미나/니켈크롬강 접합체의 미세조직 및 접합강도에 미치는 Ag-Cu-Zr-X 브레이징 합금성분의 영향 (Effect of the Alloying Elements in Ag-Cu-Zr-X Brazing Alloy on the Microstructure and the Bond Strength of $Al_2O_3$/Ni-Cr Steel Brazed Joint)

  • 김종헌;유연철
    • 소성∙가공
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    • 제7권5호
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    • pp.465-473
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    • 1998
  • The effect of alloying elements of Ag-Cu-Zr-X brazing alloy on the microstructure and the bond strength of $Al_2O_3/Ni-Cr$ brazed steel joint was investigated. The reaction layer, $ZrO_2$ (a=5.146 ${\AA}$ , b=5.213 ${\AA}$ , c=5.311 ${\AA}$ )was formed at the interface of $Al_2O_3/Ni-Cr$ steel joint by the redox reaction between alumina and Zr. The addition of An and Al to the Ag-Cu-Zr brazing alloy gave rise to changes in the thickness of the reaction product layer and the morphology of the brazement. Sn caused the segregation of Zr was decreased b Al the $ZrO_2$ layer formed at the Ag-Cu-Zr-Al alloy was thinner than that of $ZrO_2$ formed at the Ag-Cu-Zr-An alloy. The fracture shear strength was strongly dependent on the microstructure of the brazement. Brazing with Ag-Cu-Zr-Sn alloy resulted in a better bond strength than with Ag-Cu-Zr or Ag-Cu-Zr-Al alloy.

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아말감과 이종(異種)금속의 거리에 따른 부식에 대한 고찰 (A Study on Corrosion according to Distance between Amalgam and Dissimilar Metals)

  • 김주원;정은경
    • 치위생과학회지
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    • 제4권3호
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    • pp.103-109
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    • 2004
  • 본 실험은 제조회사 매뉴얼과 통법에 의해서 Amalgam 합금, Ni-Cr alloy의 Crown용 Verabond, Denture용 Talladium $^{TM}alloy$로 각각 24개의 총 72의 시편을 하악 제1대구치근 원심 치관 폭경과 임상에서의 MOD cavity를 고려하여 제작하였고 인공 타액 80ml를 담은 200ml 용 비이커에 시편을 넣어 0mm, 7mm, 40mm 거리에서 7일 후 갈바닉 부식을 측정하였다. 유리금속은 유도 플라즈마 방출 분광기(Inductively Coupled Plasma - Atomic Emission Spectrometer(ICP-AES, JY-50P, VG Elemental Co. France)로 전해액내의 Cu, Ag, Ni, Cr, Sn, Zn, Hg를 정량 분석했으며 그 결과 다음과 같은 결론을 얻었다. 첫째, Cu, Sn, Ag, Hg, Zn은 아말감이 금 합금과 접촉했을 때가 크라운용 Ni-Cr alloy와 덴쳐용 Talladium alloy 보다 아주 많이 유리 했으며 금 합금이 구강조직과 생체 적합성이 가장 좋다지만 아말감과 함께 있을 때 가장 불리 했슴을 알 수 있었다. 둘째, 아말감이 금 합금과 접촉했을 때, 금 합금의 조성에서 Ni, Cr 같은 중금속이 함유되지 않았기 때문인지 전혀 유리되지 않았으나 Sn은 조성에는 없었지만 $227.1{\pm}18.0035{\mu}g/cm^2$나 유리 되었고 Hg도 유리되었는데 이는 아말감 자체의 유리 물질임을 추측할 수 있었다. 셋째, 아말감 합금과 금 합금 사이에서의 0mm, 7mm, 40mm 거리에서는 Cu, Ag는 유의성이 있었으며 Hg는 유의성이 없었다. 이는 금합금은 절대 아말감과 같이 사용해서 안되며 이종 보철물 사이의 거리에 관계없이 사용을 금해야 하는 것으로 사료된다. 넷째, 아말감합금이 Crown용 Ni-Cr 합금과 접촉했을 때 아말감의 Ag이 유리 되지 않았으며 Zn, Ni, Sn, Hg, Cu의 순으로 유리되었다. 0mm, 7mm, 40mm 거리에 따라서 유의성이 있었다. Hg는 유리 되지 않았지만 중금속인 Ni, Cr은 유리되었고 반대 악궁이나 거리가 떨어져 있으면 접촉보다 Hg의 유리가 적었다. 다섯째, 아말감합금이 Denture용 Talladium alloy 합금과 접촉했을 때 0mm, 7mm, 40mm 거리에서도 유의성이 있었다. 0mm, 7mm, 40mm 거리에 따라서 유의성이 있었다. Hg는 유리 되지 않았지만 중금속인 Ni, Cr은 유리되었고 반대 악궁이나 거리가 떨어져 있으면 접촉보다 Hg의 유리가 적었다. 여섯째, 인공 타액에서 접촉 시 Amalgam alloy와 Gold, Verabond, Talladium alloy의 Cu, Sn, Ag, Hg, Zn, Ni, Cr의 ICPES 검사 결과 Cu, Hg가 유의성을 있었다. 일곱째, 인공타액에서 아말감합금과 두 비귀금속인 Ni-Cr alloy(crown용), Denture용 Talladium alloy가 접촉한 경우 거리에 따른 Hg, Ni, Cr의 유리 부산물에서 유의성을 확인했다.

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압연공정을 이용한 가전용 신 바이메탈재의 개발 (Development of New Bimetal Material for Home Appliances by Using the Rolling Process)

  • 박상순;이제헌;배동현;배동수
    • 소성∙가공
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    • 제16권5호통권95호
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    • pp.375-380
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    • 2007
  • The bimetals of home appliances are mainly manufactured by cladding process and these are almost consisted with Cu alloy and Ni alloy. But it is very difficult to clad these alloys, because the brittle $Cu_3O_4$ oxide film formed easily on Cu alloy surface during cladding process. Clad rolling and heat treatment processes were applied for the development of bimetals by using the Ni alloy and the 3 types of Cu alloys. Optical microstructure, micro-hardness, specific resistance, and deflection and line profile of newly processed bimetals specimens were observed and measured in this paper. Inter-diffusion was observed between Cu and Ni element in the interface of heat treated Cu alloy and Ni alloy clad material. The C1220 and Invar36 clad material showed the best property of deflection among the 3 kind of clad materials.

급냉응고된 $Ti_{50}Ni_{20}Cu_{30}$ 합금 스트립의 형상기억특성과 기계적특성 (Shape Memory Characteristics and Mechanical Properties of Rapidly Solidified $Ti_{50}Ni_{20}Cu_{30}$ Alloy Strips)

  • 김연욱
    • 한국주조공학회지
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    • 제29권5호
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    • pp.187-191
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    • 2009
  • Microstructures and shape memory characteristics of $Ti_{50}Ni_{20}Cu_{30}$ alloy strips fabricated by arc melt overflow have been investigated by means of XRD, optical microscopy and DSC. The microstructure of as-cast strips exhibited columnar grains normal to the strip surface. X-ray diffraction analysis showed that one-step martensitic transformation of B2-B19 occurred in the alloy strips. According to the DSC analysis, it was known that the martensitic transformation temperature ($M_s$) of B2 $\rightarrow$ B19 in $Ti_{50}Ni_{20}Cu_{30}$ strip is $57^{\circ}C$. During thermal cyclic deformation with the applied stress of 60 MPa, transformation hysteresis and elongation associated with the B2-B19 transformation were observed to be $3.7^{\circ}C$ and 1.6%, respectively. The as-cast strip of $Ti_{50}Ni_{20}Cu_{30}$ alloy also showed a superelasticity and its stress hysteresis was as small as 14 MPa. These mechanical properties and shape memory characteristics of the alloy strips were ascribed to B2-B19 transformation and the controlled microstructures produced by rapid solidification of the arc melt overflow process.

Electrodeposited NiCu Alloy Catalysts for Glucose Oxidation

  • Lim, Ji-Eun;Ahn, Sang Hyun;Jang, Jong Hyun;Park, Hansoo;Kim, Soo-Kil
    • Bulletin of the Korean Chemical Society
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    • 제35권7호
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    • pp.2019-2024
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    • 2014
  • NiCu alloys have been suggested as potential candidates for catalysts in glucose oxidation. In this study, NiCu alloys with different compositions were prepared on a glassy carbon substrate by changing the electrodeposition potential to examine the effect of Ni/Cu ratios in alloys on catalytic activity toward glucose oxidation. Cyclic voltammetry and chronoamperometry showed that NiCu alloys had higher catalytic activity than pure Ni and Cu catalysts. Especially, Ni59Cu41 had superior catalytic activity, which was about twice that of Ni at a given oxidation potential. X-ray analyses showed that the oxidation state of Ni in NiCu alloys was increased with the content of Cu by lattice expansion. Ni components in alloys with higher oxidation state were more effective in the oxidation of glucose.

Ni기 비정질 벌크합금의 제조와 기계적 성질 (Fabrication and Mechanical Properties of Ni-based Amorphous Bulk Alloys)

  • 김성규
    • 한국주조공학회지
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    • 제22권6호
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    • pp.288-292
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    • 2002
  • Ni-base amorphous alloys were manufactured using melt-spinning and Cu-mold die casting methods. Amorphous formability, the supercooled liquid region before crystallization and mechanical properties were examined. The reduced glass transition temperature and the supercooled liquid region of $Ni_{51} Nb_{20} Zr_9 Ti_9 Co_8 Cu_3$alloy were 0.621 and 46 K respectively. $Ni_{51} Nb_{20} Zr_9 Ti_9 Co_8 Cu_3$ alloy was produced in the rod shape 3mm diameter using the Cu-mold die casting. Hardness, compression strength, elongation and elastic modulus of the alloy were 850 DPN, 2.75 GPa, 1.8% and 150 GPa respectively. Moreover, compression strength of 2.75 GPa was the highest value in the amorphous bulk alloy produced up to now.

전기폭발법에 의한 Ni 및 Ni-Cu 나노 금속 분말의 제조와 자기적 특성연구 (Study of Synthesis and Magnetic Properties of Ni and Ni-Cu Nano Metal Powders Prepared by the Pulsed Wire Evaporation(PWE) Method)

  • 박중학;엄영랑;김경호;김흥희;이창규
    • 한국분말재료학회지
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    • 제10권2호
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    • pp.83-88
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    • 2003
  • Nanocrystalline materials of Ni and Ni-Cu alloy have been synthesized by the pulsed wire evaporation (PWE) method and these abnormal magnetic properties in the magnetic ordered state have been characterized using both VSM and SQUID in the range of high and low magnetic fields. Ni and Ni-Cu particles with an average size of 20 to 80 nm were found to influence magnetic hysterisis behavior and the results of powder neutron diffraction patterns and saturation magnetization curves are shown to indicate the absence of the NiO phase. The shifted hysterisis loop and irreversibility of the magnetization curve in the high field region were observed in the magnetic-ordered state of both Ni and Ni-Cu. The virgin magnetization curve for Ni slightly spillover on the limited hysterisis loop ($\pm$20kOe). This irreversibility in the high field of 50 kOe can be explained by non-col-linear behavior and the existence of the metastable states of the magnetization at the surface layer (or core) of the particle in the applied magnetic field. Immiscible alloy of Cu-Ni was also found to show irreversibility having two different magnetic phases.

Investigation of Initiation of Electroless Ni-P and Ni-Cu-P deposition on pure iron

  • Yiyong, W-U;Kim, M.;S.C. Kwon
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2001년도 추계학술발표회 초록집
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    • pp.10-10
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    • 2001
  • In this paper, initial depositing process of electroless Ni-Cu-P alloy was investigated by means of SEM, TEM and AES. The results show that the initial deposition is inhomogeneous and there exist different transition layers between different coatings and substrates, which are decided by the structures and compositions of the bath. For Ni-P binary alloy, its deposition takes place superiorly at grain boundary and on some grains with beneficial texture, the thickness of transition layer composed of Ni-Fe-P reaches 2000 angstrom. But during initiation of Ni-Cu-P trinary alloy, only at grain boundary is prIor to be deposited electrolessly, transited layer contains Ni-Fe-Cu-P and is decreased to about 500 angstrom. The structures of the films of Ni-P and Ni-Cu-P are crystalline at the initial depositing stage. The mechanisms of the process are put forward in this paper.

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가스분무주조 Cu-Sn-Ni-Si 합금의 미세조직 및 상온 인장성질 (Microstructure and Tensile Properties of Spray Cast Cu-Sn-Ni-Si Alloy)

  • 강희수;이언식;이규창;백경호
    • 한국분말재료학회지
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    • 제17권6호
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    • pp.470-476
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    • 2010
  • In this study, Cu-10Sn and Cu-10Sn-2Ni-0.2Si alloys have been manufactured by spray casting in order to achieve a fine scale microstructure and high tensile strength, and investigated in terms of microstructural evolution, aging characteristics and tensile properties. Spray cast alloys had a much lower microhardness than continuous cast billet because of an improved homogenization and an extended Sn solid solubility. Spray cast Cu-Sn-Ni-Si alloy was characterized by an equiaxed grain microstructure with a small-sized (Ni, Si)-rich precipitates. Cold rolling of Cu-Sn-Ni-Si alloy increased a tensile strength to 1220 MPa, but subsequent ageing treatment reduced a ultimate tensile strength to 780 MPa with an elongation of 18%.

YBCO 초전도 박막 선재용 Ni-W 및 Ni-W-Cu 합금의 격자상수 변화 (Variation of Lattice Constant in Ni-W and Ni-W-Cu Alloys for YBCO Coated Conductor)

  • 김민우;정규동;전병혁;김형섭;김찬중
    • Progress in Superconductivity
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    • 제7권1호
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    • pp.64-68
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    • 2005
  • We fabricated Ni-based alloy substrates for YBCO coated conductor using powder metallurgy. Tungsten and copper were selected as alloy elements due to their mutual solubility to the base element of nickel. The alloying elements were mixed with nickel using ball milling and dried in air. The powder mixtures were packed in a rubber mold, cold isostatic pressed 200 MPa and made into rods. The compacted rods were sintered at $1150^{\circ}C$ for 6 hours for densification. It was confirmed by neutron diffraction experiment that W and Cu atoms made complete solid solution with Ni. Lattice constant of nickel alloy increased by $0.004{\AA}$ for 1at. $\%$ W in Ni-W alloy, $0.0006{\AA}$ for 1 at. $\%$ Cu in Ni-W-Cu alloy.

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