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    Wyświetlanie 1-4 z 4
    Tytuł:
    Electrorefining of Indium Metal From Impure In-Sn Alloy in Fluoride Molten Salt
    Autorzy:
    Lee, Hyun-Gyu
    Choi, Sang-Hoon
    Sim, Jae-Jin
    Lim, Jae-Hong
    Hyun, Soong-Keun
    Lee, Jong-Hyeon
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/352615.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    indium metal
    molten salt electrolysis
    cyclic voltammetry
    chronopotentiometry
    electrodeposition
    Opis:
    In this study, molten salt electrorefining was used to recover indium metal from In-Sn crude metal sourced from indium tin oxide (ITO) scrap. The electrolyte used was a mixture of eutectic LiF-KF salt and InF3 initiator, melted and operated at 700°C. Voltammetric analysis was performed to optimize InF3 content in the electrolyte, and cyclic voltammetry (CV) was used to de-termine the redox potentials of In metal and the electrolyte. The optimum initiator concentration was 7 wt% of InF3 , at which the diffusion coefficients were saturated. The reduction potential was controlled by applying constant current densities of 5, 10, and 15 mA/cm2 using chronopotentiometry (CP) techniques. In metal from the In-Sn crude melt was deposited on the cathode surface and was collected in an alumina crucible.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 899-905
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of 4N5 Grade Tantalum Wire from Tantalum Scrap by EBM and Drawing
    Autorzy:
    Yu, Ji-Won
    Choi, Sang-Hoon
    Sim, Jae-Jin
    Lim, Jae-Hong
    Seo, Kyoung-Deok
    Hyun, Soong-Keon
    Kim, Tae-Youb
    Gu, Bon-Woo
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/353005.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron beam melting
    drawing
    tantalum scrap
    recycling
    high purity
    Opis:
    Electron beam melting(EBM) is a useful technique to obtain high-purity metal ingots. It is also used for melting refractory metals such as tantalum, which require melting techniques employing a high-energy heat source. Drawing is a method which is used to convert the ingot into a wire shape. The required thickness of the wire is achieved by drawing the ingot from a drawing die with a hole of similar size. This process is used to achieve high purity tantalum springs, which are an essential component of lithography lamp in semiconductor manufacturing process. Moreover, high-purity tantalum is used in other applications such as sputtering targets for semiconductors. Studies related to recycling of tantalum from these components have not been carried outuntil now. The recycling of tantalum is vital for environmental and economic reasons. In order to obtain high-purity tantalum ingot, in this study impurities contained in the scrap were removed by electron beam melting after pre-treatment using aqua regia. The purity of the ingot was then analyzed to be more than 4N5 (99.995%). Subsequently, drawing was performed using the rod melted by electron beam melting. Owing to continuous drawing, the diameter of the tantalum wire decreased to 0.5 mm from 9 mm. The hardness and oxygen concentration of the tantalum ingot were 149 Hv and less than 300 ppm, respectively, whereas the hardness of the tantalum wire was 232.12 Hv. In conclusion, 4N5 grade tantalum wire was successfully fabricated from tantalum scrap by EBM and drawing techniques. Furthermore, procedure to successfully recycle Tantalum from scraps was established.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 935-941
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of High-Purity Tantalum Metal Powder for Capacitors Using Self-Propagating High-Temperature Synthesis
    Autorzy:
    Lee, Yong-Kwan
    Sim, Jae-Jin
    Byeon, Jong-Soo
    Lee, Yong-Tak
    Cho, Yeong-Woo
    Kim, Hyun-Chul
    Heo, Sung-Gue
    Lee, Kee-Ahn
    Seo, Seok-Jun
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/2049150.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tantalum
    self-propagating high-temperature synthesis
    tantalum oxide
    magnesium
    capacitor
    Opis:
    In this study, high-purity tantalum metal powder was manufactured via self-propagating high-temperature synthesis. During the process, Ta2O5 and Mg were used as the raw material powder and the reducing agent, respectively, and given that combustion rate and reaction temperature are important factors that influence the success of this process, these factors were controlled by adding an excessive mass of the reducing agent (Mg) i.e., above the chemical equivalent, rather than by using a separate diluent. It was confirmed that Ta metal powder manufactured after the process was ultimately manufactured 99.98% high purity Ta metal powder with 0.5 μm particle size. Thus, it was observed that adding the reducing reagent in excess favored the manufacture of high-purity Ta powder that can be applied in capacitors.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 935-939
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ZrO2 and Al2O3 Addition on the Physical Properties of Cu-Mo-Cr Alloy by Liquid Phase Sintering
    Autorzy:
    Cho, Yeong-Woo
    Sim, Jae-Jin
    Heo, Sung-Gue
    Kim, Hyun-Chul
    Lee, Yong-Kwan
    Byeon, Jong-Soo
    Lee, Yong-Tak
    Lee, Kee-Ahn
    Seo, Seok-Jun
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/2049193.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al2O3
    ZrO2
    Cu-Mo-Cr
    sintering
    powder metallurgy
    Opis:
    In this study, the effect of the addition of ZrO2 and Al2O3 ceramic powders to Cu-Mo-Cr alloy was studied by examining the physical properties of the composite material. The ceramic additives were selected based on the thermodynamic stability calculation of the Cu-Mo-Cr alloys. Elemental powders, in the ratio Cu:Mo:Cr = 60:30:10 (wt.%), and approximately 0-1.2 wt.% of ZrO2 and Al2O3 were mixed, and a green compact was formed by pressing the mixture under 186 MPa pressure and sintering at 1250°C for 5 h. The raw powders were evenly dispersed in the mixed powder, as observed by scanning electron microscopy. After sintering, the microstructures, densities, electrical conductivities, and hardness of the composites were evaluated. We found that the addition of ZrO2 and Al2O3 increased the hardness and decreased the electrical conductivity and density of the composites.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 683-687
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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