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    Wyświetlanie 1-7 z 7
    Tytuł:
    Development of Superior Thermal Protective Coating on Carbon Composites
    Autorzy:
    Bae, Soo Bin
    Lee, Ji Eun
    Paik, Jong Gyu
    Cho, Nam Choon
    Lee, Hyung Ik
    Powiązania:
    https://bibliotekanauki.pl/articles/354076.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    silicon carbide
    CVR
    CVD
    Opis:
    A superior SiC based thermal protection coating process for carbon composite, which can be especially effective in a hot oxidizing atmosphere, was established in this study. A multi-coating process based on a combination of Chemical Vapor Reaction (CVR) and Chemical Vapor Deposition (CVD) was developed. Various protective coating layers on carbon composite were tested in hot oxidizing surroundings and the test results verified that the thermal ablation rate could be dramatically reduced down to 3.8% when the protective multi-coating was applied. The thermal protection mechanism of the coating layers was also investigated.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1371-1375
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applicability Study of Co and Eu Extraction Using Solvent from Ca Rich HCl Solution
    Autorzy:
    Oh, Maengkyo
    Lee, Keunyoung
    Foster, Richard I.
    Kim, Ik-Soo
    Lee, Chang-Ha
    Powiązania:
    https://bibliotekanauki.pl/articles/2203724.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solvent extraction
    radioactive wastewater
    waste valorization
    Cyanex 272
    Cyanex 301
    Opis:
    This study was conducted to treat radioactive acidic wastewater, which contained radioactive 60Co and 152Eu. The wastewater can be generated during a decommissioning project to reduce the volume of radioactive concrete waste from nuclear facilities. With a variety of methods for separating the radioactive nuclides available, we evaluated the separation applicability of the solvent extraction method. From our results, Co and Eu could be easily extracted from the Ca rich wastewater using Cyanex301 (Co extraction (%) 99.8, Eu extraction (%) 99.6) without Ca extraction. On the other hand, Eu could be selectively separated by Cyanex272 (Eu extraction (%) 99.1) without Co and Ca extraction at pH 2~3. Therefore, the extraction method can be tailored according to the target radionuclides present in the wastewater and be selectively applied to the overall treatment process. By extracting radioactive Co and Eu from acidic wastewater to below the discharge criteria, treated wastewater could be regarded as non-radioactive industrial waste, to be economically and easily handled. Moreover, it may be possible to reuse separated Co and Eu for research and industrial applications by realizing waste valorization.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 123--126
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the Durability of SiC-Coated Carbon Composites Under Thermal Shock Conditions
    Autorzy:
    Lee, Ji Eun
    Bae, Soo Bin
    Cho, Nam Choon
    Lee, Hyung Ik
    Meng, Zicheng
    Lee, Kee Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049309.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    carbon composites
    silicon carbide coating
    chemical vapor deposition
    chemical vapor reaction
    Opis:
    Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 777-782
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Transition Metal Carbides on Microstructure and Mechanical Properties of Ultrafine Tungsten Carbide Via Spark Plasma Sintering
    Autorzy:
    Lee, Jeong-Han
    Oh, Ik-Hyun
    Park, Hyun-Kuk
    Powiązania:
    https://bibliotekanauki.pl/articles/2048887.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    transition metal carbide
    spark plasma sintering
    grain growth inhibitor
    hardness
    Opis:
    WC-Co cemented carbides were consolidated using spark plasma sintering in the temperature 1400°C with transition metal carbides addition. The densification depended on exponentially as a function of sintering exponent. Moreover, the secondary (M, W)Cx phases were formed at the grain boundaries of WC basal facet. Corresponded, to increase the basal facets lead to the plastic deformation and oriented grain growth. A higher hardness was correlated with their grain size and lattice strain. We suggest that this is due to the formation energy of (M, W)Cx attributed to inhibit the grain growth and separates the WC/Co interface.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1029-1032
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consolidation and Oxidation of Ultra Fine WC-Co-HfB2 Hard Materials by Spark Plasma Sintering
    Autorzy:
    Park, Hyun-Kuk
    Oh, Ik-Hyun
    Kim, Ju-Hun
    Hong, Sung-Kil
    Lee, Jeong-Han
    Powiązania:
    https://bibliotekanauki.pl/articles/2049178.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC cemented carbide
    hafnium diboride
    spark plasma sintering
    oxidation
    mechanical property
    Opis:
    In this study, a novel composite was fabricated by adding the Hafnium diboride (HfB2) to conventional WC-Co cemented carbides to enhance the high-temperature properties while retaining the intrinsic high hardness. Using spark plasma sintering, high density (up to 99.4%) WC-6Co-(1, 2.5, 4, and 5.5 wt. %) HfB2 composites were consolidated at 1300°C (100°C/min) under 60 MPa pressure. The microstructural evolution, oxidation layer, and phase constitution of WC-Co-HfB2 were investigated in the distribution of WC grain and solid solution phases by X-ray diffraction and FE-SEM. The WC-Co-HfB2 composite exhibited improved mechanical properties (approximately 2,180.7 kg/mm2) than those of conventional WC-Co cemented carbides. The high strength of the fabricated composites was caused by the fine-grade HfB2 precipitate and the solid solution, which enabled the tailoring of mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 997-1000
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Process Variables on Friction Stirred Microstructure and Surface Hardness of AZ31 Magnesium Alloy
    Autorzy:
    Kim, Jae-Yeon
    Hwang, Jung-Woo
    Lee, Seung-Mi
    Hyun, Chang-Young
    Park, Ik-Keun
    Byeon, Jai-Won
    Powiązania:
    https://bibliotekanauki.pl/articles/355106.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir process
    AZ31 alloy
    diamond particle
    process variable
    grain size
    Opis:
    Effects of various friction stir processing (FSP) variables on the microstructural evolution and microhardness of the AZ31 magnesium alloy were investigated. The processing variables include rotational and travelling speed of the tool, kind of secondphase (i.e., diamond, Al2 O3 , and ZrO2 ) and groove depth (i.e., volume fraction of second phase). Grain size, distribution of second phase particle, grain texture, and microhardness were analyzed as a function of the FSP process variables. The FSPed AZ31 com-posites fabricated with a high heat input condition showed the better dispersion of particle without macro defect. For all composite specimens, the grain size decreased and the microhardness increased regardless of the grooved depth compared with that of the FSPed AZ31 without strengthening particle, respectively. For the AZ31/diamond composite having a grain size of about 1 μm, microhardness (i.e., about 108 Hv) was about two times higher than that of the matrix alloy (i.e., about 52 Hv). The effect of second phase particle on retardation of grain growth and resulting hardness increase was discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 907-911
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Si Addition on Microstructure and Mechanical Properties of the Al Alloys with High Cr Content Prepared by Gas Atomization and SPS Processes
    Autorzy:
    Kim, Yong-Ho
    Oh, Ik-Hyun
    Yoo, Hyo-Sang
    Park, Hyun-Kuk
    Lee, Jung-Han
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Cr-Si
    gas atomization
    spark plasma sintering
    powder
    rapid solidification
    Opis:
    This research describes effects of Si addition on microstructure and mechanical properties of the Al-Cr based alloys prepared manufactured using gas atomization and SPS (Spark Plasma Sintering) processes. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). Microstructure of the as-atomized Al-Cr-Si alloys with high contents of Cr and Si was composed multi-phases with hard and thermally stable such as Al13Cr4Si4, AlCrSi, Al8Cr5 and Cr3Si intermetallic compounds. The average hardness values were 703 Hv for S5, 698 Hv for S10 and 824 Hv for S20 alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with hard and thermally stable and fine microstructure by the addition of high Cr and Si using rapid solidification and SPS process.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1045-1049
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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