• Title/Summary/Keyword: Cu-rich

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Microstructure and Mechanical Properties of Strip Casted Ag-27%Cu-25%Zn-3%Sn Brazing Alloy (브레이징용 Ag-27%Cu-25%Zn-3%Sn 박판 주조 스트립의 미세조직 및 기계적 특성 연구)

  • Kim, S.J.;Kim, M.C.;Lee, K.A.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.313-316
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    • 2008
  • This work sought to examine the suitability of twin roll strip casting for Ag-27%Cu-25%Zn-3%Sn brazing alloy (BAg-7A) and to investigate the mechanical properties and microstructure of the strip. The effect of aging heat treatment on the properties was also studied,. This new manufacturing process has applications in the production of the brazing alloy. XRD and microstructural analysis of the Ag-27%Cu-25%Zn-3%Sn strip represented eutectic microstructure of a Cu-rich phase and a Ag-rich matrix regardless of heat treatment. The results of mechanical tests showed tensile strength of 470MPa, a significant enhancement, and an 18% elongation of the twin roll casted strip, due mainly to the solid solution strengthening of Zn atoms (${\sim}20%$) in the Cu-rich phases. Tensile results showed gradually decreasing strengths and increasing elongation with aging heat treatment. Microstructural evolution and fractography were also investigated and related to the mechanical properties.

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Physical Properties with Cu/(In+Ga) Ratios of Cu(InGa)$Se_2$ Films (Cu(InGa)$Se_2$ 박막의 Cu/(In+Ga) 조성비에 따른 전기적 물성특성)

  • Kim, S.K.;Lee, J.L.;Kang, K.H.;Yoon, K.H.;Song, J.;Park, I.J.;Han, S.O.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1584-1586
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    • 2002
  • CuIn$Se_2$ (CIS) and related compounds such as Cu($In_xGa_{1-x})Se_2$(CIGS) have been studied by their potential for use in photovoltaic devices. CIS thin film materials which have high absorption coefficient and wide bandgap, have attracted much attention as an alternative to crystalline and amorphous silicon solar cells currently in use. Cu-rich CIGS film have very low resistivity, due to coexistence of the semimetallic $Cu_{2-x}Se$. In-rich CIGS films show high resistivity, since these films are compensated films without the $Cu_{2-x}Se$ phase. Optical properties of the CIGS films also change in accordance with the resistivity for the Cu/(In+Ga) ratio. The Cu-rich films have different spectra from In-rich films in near infrared wavelengths.

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Geochemistry of the Hydrothermal Chimneys in the Manus Basin, Southwestern Pacific Ocean (남서태평양 Manus Basin에서 산출되는 열수 분출구에 대한 지화학적 연구)

  • 이경용;최상훈;박숭현
    • Economic and Environmental Geology
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    • v.35 no.1
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    • pp.1-12
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    • 2002
  • Manus Basin, located in the equatorial western Pacific, is a back arc basin formed by collision between the IndoAustralian and the Pacific Plates. The basin is host to numerous hydrothermal vent fields and ore deposits. The basement rocks of the Manus Basin consist primarily of dacite and basaltic andesite. Some of the minerals that form the hydrothermal chimneys that were dredged on the Manus basin include pyrite, chalcopyrite, marcasite, sphalerite and galena. The chimneys can be classified into chalcopyrite dominant Cu-rich type and sphalerite dominant Zn-rich type. The concentration of Zn shows good positive correlation with that of Sb, Cd and Ag. The content of Cu, on the other hand, positively correlates with that of Mo, Mn and Co. For samples that were taken from Zn-rich chimney, a strong positive correlation is found between Au and Zn contents. The chimney also shows enrichments of Cd, Mn and Sb. On the other hand, the samples from Cu-rich chimney exhibit strong correlation among Au, Zn and Pb, and are enriched in Mo and Co concentration. Average contents of Au in Cu-rich and Znrich chimneys were 15.9 ppm and 29.0 ppm, respectively. Because of high concentration of Au with Ag and Cu, the ore deposit have high economic potential. Homogenization temperatures and salinities of fluid inclusions in anhydrite and amorphous silica from Zn-rich chimney are estimated to be l74-220$^{\circ}$C and 2.7-3.6 equiv. wt. % NaCI, respectively. These value suggest that ore forming processes were occurred at around 200$^{\circ}$C and that the oxygen fugacity changed from 2: 10$^{-39.5}$bar to -s: 10$^{-40.8}$bar and the sulfur fugacity from -s: 10$^{-14.7}$bar to 10$^{-13.4}$bar during the process. It appears that the temperature at which the ores formed on Cu-rich chimney was higher than that on Zn-rich chimney.

Effect of the Heat Treatment Temperature on the Brazed Microstructure of Dissimilar Ti and Cu Metals Using a Zr-Base Amorphous Filler (Zr계 비정질 삽입재를 이용한 Ti-Cu 이종 접합부의 미세조직 형성에 미치는 확산 열처리 온도의 영향)

  • Lee, Jung Gu;Lee, Jong Keuk;Lee, Min Ku;Rhee, Chang Kyu
    • Journal of the Korean Society for Heat Treatment
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    • v.20 no.1
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    • pp.17-21
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    • 2007
  • In this study, brazing characteristics of the dissimilar Ti and Cu metals using a Zr-base amorphous filler ($Zr_{41.2}Ti_{13.8}Cu_{12.5}Ni_{10.0}Be_{22.5}$ in at.%) have been investigated for various bonding temperatures. In the sample brazed at $790^{\circ}C$ for 10 min., the Ti-rich phases in the joint were observed, while the Cu-rich phases were obtained in the sample brazed at $825^{\circ}C$ for 10 min.. Such a different microstructure and composition in the joints could be explained by the degree of the dissolution reaction. At $790^{\circ}C$, the reaction between the Zr-rich liquid phase and the Ti base metal was actively occurred to form Ti-rich liquid phase in the joint. As the temperature increased to $825^{\circ}C$, however, the reaction between the Ti-rich liquid phase and the Cu base metal was promoted to form the Cu-rich liquid phase in the joint finally. Such a different interface reaction is attributed to the reactivity or solubility between the Zr as a main element in the filler and the Ti and Cu as a base metal element.

A Calorimetric Study on the Martensitic Transformation Characteristics with Chemical Composition and Thermal Cycling in Cu-Zr Binary Alloys (Cu-Zr이원계 합금에서 화학조성 및 열싸이클링에 따른 마르텐사이트변태 특성의 열분석학적 연구)

  • Jang, W.Y.;van Humbeeck, J.;Jo, M.S.;Lee, J.H.;Lee, Y.S.;Kang, J.W.;Gwak, S.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.11 no.2
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    • pp.111-120
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    • 1998
  • The effects of chemical composition and thermal cycling on the martensitic transformation characteristics in Cu-rich, equiatomic and Zr-rich CuZr binary alloys have been studied by calorimetry. Only martensite could be indentified in equiatomic $Cu_{49.9}Zr_{50.1}$ alloy, while $Cu_{10}Zr_7$ and $CuZr_2$ intermetallic compounds as well as martensite were formed by rapid cooling from the melts in Cu-rich $Cu_{52.2}Zr_{47.5}$ alloy and Zr-rich $Cu_{48.4}Zr_{51.6}$ alloy, respectively. The $M_s$ temperature of $Cu_{49.9}Zr_{50.1}$ was $156^{\circ}C$ but those of $Cu_{52.5}Zr_{47.5}$ and $Cu_{48.4}Zr_{51.6}$ alloys, being $109^{\circ}C$ and $138^{\circ}C$, were lower than that of equiatomic $Cu_{49.9}Zr_{50.1}$ alloy. In all the alloys, the $M_s$ temperature has fallen but the $A_s$ temperature has risen, resulting in widening of the transformation hysteresis with thermal cycling. The anomalous characteristics in the transformation temperature are due to the presence of the intermetallic compounds i.e. $Cu_{10}Zr_7$ and $CuZr_2$ formed by an eutectoid reaction during thermal cycling in the temperature range between $-100^{\circ}C$ < $T_c$ < $400^{\circ}C$.

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Phase Separation of Matrix Glasses and Precipitation Characteristics of CuCl Nanocrystals in CuCl Doped Borosilicate Glasses for Nonlinear Optical Application (CuCl 미립자 분산 붕괴산염계 비선형 광학유리에서 매질유리의 상분리와 CuCl 미립자의 석출 특성)

  • 윤영권;한원택
    • Journal of the Korean Ceramic Society
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    • v.34 no.8
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    • pp.886-896
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    • 1997
  • To investigate an effect of phase separation on precipitation characteristics of CuCl nanocrystals in CuCl doped nonlinear optical glasses, borosilicate glass systems with 9 different compositions with ~2wt% of CuCl were selected and CuCl doped glasses were prepared by melting and precipitation method. Microstructural properties of the CuCl doped glasses were analyzed by optical absorption spectroscopy, acid elution test, TEM, and EDXS. While phase separation did not occur in Glass A~D, interconnected and droplet microstructures due to phase separation were found in Glass E, F and Glass G~I, respectively. In the particular composition of the matrix glasses in this study, the precipitation of the CuCl particles was observed in the phase separable glasses, not in phase non-separable glasses. The CuCl particles were precipitated in both silica-rich phase region and boronrich phase region of the glass matrix. In the case of 7.7Na2O-36.6B2O3-52.7SiO2(mole%) glass, the larger CuCl particles than those in the silica-rich phase region were observed in the boron-rich phase region.

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On the Microstructures of Al-Cu-Ni Ternary Alloys by Upward Continuous Casting (상향식 연속주조법에 의한 Al-Cu-Ni 3원합금의 응고조직에 관한 연구)

  • Kwon, Kee-Kyun;Lee, Kye-Wan
    • Journal of Korea Foundry Society
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    • v.10 no.5
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    • pp.426-434
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    • 1990
  • Continuous casting of the Al-Cu-Ni ternary eutectic alloys was carried out by the upward continuous casting process. The morphology of the ternary eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions. It was possible to get the planar solid-liquid interface at the condition of $G_L/R=3.59{\times}10^3^{\circ}C\;sec/mm^2$ in Al-Cu-Ni ternary eutectic alloys. In Al-rich, Ni-rich and Cu-rich hypereutectics of Al-Cu-Ni ternary alloys, primary ${\alpha},\;{\tau}\;and\;{\theta}$ dendrites have grown as the leading phase ahead of the ternary eutectic composites.

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구리 폐촉매 재처리

  • Lee, Gwang-Ho;Lee, Seung-Gon;Sin, Seung-Ho;Song, Yun-Seop
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2004.05a
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    • pp.59-65
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    • 2004
  • 동제련 공정중 Smelting에서 SiO2가 없으면 산화에 의한 생성물은 Molten Cu-Fe-O 'Oxysulphide' 와 Solid Magnetite가 된다. 이 생성물은 Cu-rich Liquid와 Cu-dilute Liquid로 분리가 불가능하다. Smelting의 목적이 Cu가 높은 Matte와 산화된 불순물의 효과적인 분리에 있으므로 이와 같은 분리가 불가능한 혼합상태를 분리해 주어야 한다. 이때 SiO2가 첨가되면 Cu-rich 상인 Matte가 FeO-rich상인 Slag로의 분리가 가능해진다. 이러한 의미에서 동제련에 있어서 규사의 성분은 매우 중요하며 현재 재생사를 규사로 대체 사용하고 있다. 한편 실리콘 모노머 합성 공정인 금속 규소와 접촉 물질(Contact Mass, 구리촉매와 조촉매)을 반응시켜 (Si+CH3Cl ${\rightarrow}$ (CH3)2SiCl3) 실리콘 모노머를 생산하는 공정중 반응이 끝난 접촉물질인 구리 폐촉매가 발생되는데 주요성분이 Cu 12%, Si80%로 재생사와 유사하여 동제련에 투입 가능 여부를 판단하기 위하여 각 공정에서의 용융실험을 통하여 결론을 도출하였고, 실 조업 Test를 거쳐 처리하게 되므로 구리 회수 및 폐기물로써의 매립을 중지 할 수 있었다.

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Interfacial Structure of Inconel/$Si_3N_4$ Joint Using Ag-Cu-Ti Brazing Metal (Ag-Cu-Ti Brazing 금속을 이용한 Inconel/$Si_3N_4$ 접합의 계면구조)

  • 정창주;장복기;문종하;강경인
    • Journal of the Korean Ceramic Society
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    • v.33 no.12
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    • pp.1421-1425
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    • 1996
  • Sintered Si3N4 and Inconel composed of Ni(58-63%) Cr(21-25%) Al(1-17%) Mn(<1%) fe(balance) were pressurelessly joined by using Ag-Cu-Ti brazing filler metal at 950℃ and 1200℃ under N2 gas atmosphere of 1atm and their interfacial structures were investigated. In case that the reaction temperature was low as 950℃ its interfacial structure was "Inconel metal/Ti-rich phase layer/brazing filler metal layer/Si3N4 " Ti used as reactive metal existed in between inconel steel and brazing metal and moved to the interface of between brazing filler metal nd Si3N4 according as reaction temperature increased up to 1200℃. The interfacial structure of inconel steel-Si3N4 reacted at 1200℃ was ' inconel metal/Ni-rich phase layer containing of Fe. Cr and Si/Cu-rich phase layer containing of Mn and Si/Si3N4 " Cr Mn, Ni and Fe diffused to the interface of between brazing filler metal and Si3N4 and reacted with Si3N4 The most reactive components of ingredients of inconel metal were Cr and Mn. On the other hand Ti added as reactive components to Ag-Cu eutectic segregated into Ni-rich phase layer,.

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Mechanical and Electrical Properties of Cu-15wt.%Ag Microcomposites Processed by Equal Channel Angular Pressing (등통로각압축공정을 이용하여 제작된 Cu-15wt.%Ag 미세복합재료의 미세구조 및 기계적, 전기적 특성)

  • Cho, Kyu Jin;Hong, Sun Ig
    • Korean Journal of Metals and Materials
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    • v.49 no.2
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    • pp.128-136
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    • 2011
  • Equal channel angular pressing (ECAP) with intermediate heat treatment was employed to optimize the strength of Cu-15 wt.%Ag. Changes in microstructure, electrical properties and mechanical properties were studied as a function of pressing methods and heat treatment. ECAPed Cu-15wt.%Ag exhibited ultrafine-grained microstructures with the shape and distribution of Ag-rich lamellae dependent on the processing routes. For route A in which the sample was pressed without rotation between each pass, the initial dendrites of Ag-rich phase were elongated along the shear direction and developed into elongated filaments. For route C in which the sample was rotated by 180 degree after each pass, the morphology of initial dendrites of Ag-rich phase was not much modified and the networked structure remained even after 8 passes of ECAP. For route Bc in which the sample was rotated by 90 degree after each pass, the initial dendrites became finer by fragmentation with no pronounced change of the shape and distribution of Ag-rich lamellae. The strength of Cu-15wt.%Ag ECAPed using route Bc was found to be greater than those ECAPed using route A, suggesting that the substructural strengthening is more effective in strengthening than the interface strengthening.