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Wyszukujesz frazę "Choi, Sang-Hoon" wg kryterium: Autor


Wyświetlanie 1-2 z 2
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
    Wyświetlanie 1-2 z 2

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