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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of Atmospheric-Pressure Gas-Plasma Treatment on Surface Properties of Hot-Dip Zn-Mg-Al Alloy-Coated Steel
    Autorzy:
    Jeong, Chang-U
    Kim, Jae-Hyeon
    Park, Je-Shin
    Kim, Min-Su
    Kim, Sung-Jin
    Oh, Min-Suk
    Powiązania:
    https://bibliotekanauki.pl/articles/2203736.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma treatment
    Zn-Mg-Al-galvanized steel
    surface energy
    process gas
    Opis:
    The effect of plasma-radical change on the surface properties of Zn-Mg-Al ternary-alloy-coated steel sheets during atmospheric-pressure (AP) plasma treatment using different process gases: O2, N2, and compressed air was investigated. The plasma-induced radicals promoted the formation of chemical particles on the surface of the Zn-Mg-Al coating, thereby increasing the surface roughness. The surface energy was calculated using the Owen-Wendt geometric equation. Contact angle measurements indicated that the surface free energy of the alloy sheets increased upon AP plasma treatment. The surface properties of the Zn-Mg-Al coating changed more significantly in the order air > O2 > N2 gas, indicating that the plasma radicals facilitated the carbonization and hydroxylation of the Mg and Al components during the AP plasma treatment.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 187--190
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacture of MoO3 Coating Layer Using Thermal Spray Process and Analysis of Microstructure and Properties
    Autorzy:
    Hwang, Yu-Jin
    Kim, Kyu-Sik
    Park, Jae-Sung
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2174568.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MoO3
    thermal spray
    atmospheric plasma spray
    microstructure
    properties
    Opis:
    MoO3 thick film was manufactured by using a thermal spray process (Atmospheric Plasma Spray, or APS) and its micro-structure, phase composition and properties of the coating layer were investigated. Initial powder feedstock was composed of an orthorhombic α-MoO3 phase, and the average powder particle size was 6.7 μm. As a result of the APS coating process, a MoO3 coating layer with a thickness of about 90 μm was obtained. Phase transformation occurred during the process, and the coating layer consisted of not only α-MoO3 but also β-MoO3, MoO2. Phase transformation could be due to the rapid cooling that occurred during the process. The properties of the coating layer were evaluated using a nano indentation test. Hardness and reduced modulus were obtained as 0.47 GPa and 1.4 GPa, respectively. Based on the above results, the possibility of manufacturing a MoO3 thick coating layer using thermal spray is presented.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1535--1538
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Education and Research on Polish Studies in Korea
    Autorzy:
    Cheong, Kwon Byung
    Kim, Jong Suck
    Choi, Sung Eun (Estera Czoj)
    Kim, Yong Deog
    Kim, Ji Young
    Lee, Ok Jin
    Lee, Ji Wone
    Koh, Seung Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/26414309.pdf
    Data publikacji:
    2013-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Polish studies
    Korea
    Department of Polish Studies
    HUFS
    Opis:
    Polish education and research in Korea has become systematic since the establishment of the Department of Polish Studies at Hankuk University of Foreign Studies (HUFS). The Department of Polish Studies at HUFS is the only academic department in Korea which teaches and studies the politics, economy, history, and culture of Poland, as well as the Polish language and literature. Since its establishment in 1987, the department has produced more than 800 graduates. The Department of Polish Studies forms and maintains a close relationship with universities in Poland. It also makes continuous effort for more students to study the Polish language at universities in Poland.
    Źródło:
    The New Educational Review; 2013, 32; 19-34
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Efficiency Cooling System Using Additive Manufacturing
    Autorzy:
    Woo, Yeong-Jin
    Nam, Dong-Ho
    Lee, Seok-Rok
    Kim, Eun-Ah
    Lee, Woo-Jin
    Yang, Dong-Yeol
    Yu, Ji-Hun
    Park, Yong-Ho
    Lee, Hak-Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049198.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    DfAM
    Design for Additive Manufacturing
    cooling system
    lattice structure
    simulation
    Opis:
    In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 689-693
    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 1-6 z 6

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