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    Wyświetlanie 1-6 z 6
    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:
    The prevalence and risk factors of musculoskeletal disorders in the hands of fishermen working as oyster shuckers
    Autorzy:
    Park, Jin Sung
    Yoo, Jun-Il
    Na, Jae-Bum
    Song, Han Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/2095509.pdf
    Data publikacji:
    2021-09-03
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    osteoarthritis
    fishermen
    musculoskeletal disorders
    wrist
    hands
    oyster shuckers
    Opis:
    ObjectivesThis study aimed to investigate the prevalence of musculoskeletal disorders in the hands and wrists of fishermen working as oyster shuckers, and to identify the risk factors associated with oyster shucking. Material and Methods A total of 590 fishery workers including those working as oyster shuckers in 2015–2017 were included in the study analysis. Hand osteoarthritis (OA), carpal tunnel syndrome (CTS), and ulnar impaction syndrome were diagnosed using X-ray, magnetic resonance imaging, and physical examinations according to each diagnostic criterion. The Rapid Entire Body Assessment was used as a measurement tool for analyzing the occupation-related burden factors.ResultsThe prevalence of hand OA, CTS, and ulnar impaction syndrome was higher in oyster shuckers than in aquaculture/offshore fishery workers. The prevalence of upper limb disease was higher in oyster shuckers than in other fishery workers, even in the prevalence of exposure to occupational burden factors. In oyster shuckers, the incidence of hand and wrist OA was 84%, that of CTS was 72%, and that of ulnar impaction syndrome was 41%. In addition, oyster shuckers were more likely to be exposed to occupational burden factors than were other types of fishermen. Conclusions The prevalence of hand OA, CTS, and ulnar impaction syndrome was higher in oyster shuckers. Therefore, proper stretching or exercises for rest and musculoskeletal relaxation, along with health-care education and promotion, will be needed for the fishermen’s repeated posture and impact work.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 5; 603-615
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Durability of Dimensionally Stable Electrode in High-Rate Electroplating Process Condition Using Accelerated Life Test
    Autorzy:
    Park, Sung Cheol
    Jung, Yeon Jae
    Koo, Seokbon
    Lee, Kee-Ahn
    Son, Seong Ho
    Powiązania:
    https://bibliotekanauki.pl/articles/2049186.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    prediction
    dimensionally stable electrode
    accelerated life test
    failure mechanism
    Opis:
    In order to the long-term stability of DSE for electroplating process, the lifetime equations were calculated from the results of the accelerated life testing, and the lifetime of DSE was predicted. The nano-embossing pre-treatment led to 2.65 times in the lifetime of DSE. The degradation mechanism of DSE with a thick metal oxide layer for applied highly current density process condition was identified. The improvement of durability of DSE seems to be closely related to adhesion between titanium plate and mixed metal oxide layer.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 675-678
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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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