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    Wyświetlanie 1-4 z 4
    Tytuł:
    Gas Atomization Parametric Study on the VIGA-CC Based Synthesis of Titanium Powder
    Autorzy:
    Kim, Dae-Kyeom
    Kim, Young-Il
    Lee, Hwaseon
    Kim, Young Do
    Lee, Dongju
    Lee, Bin
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/355636.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder production
    gas atomization
    titanium
    orifice
    Opis:
    With the recent advancement in technology for titanium metal powder injection molding and additive manufacturing, high yield and good flowability powder production is needed. In this study, titanium powder was produced through vacuum induction melting gas atomization with a cold crucible, which can yield various alloy compositions without the need for material pretreatment. The gas behavior in the injection section was simulated according to the orifice protrusion length for effective powder production, and powder was prepared based on the simulation results. The gas distribution changes with the orifice protrusion length, which changes the location of the recirculation zone and production yield of the powder. The produced powders had a spherical morphology, and the content of impurities (N, O) changed with the injected-gas purity.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 997-1000
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Deformation Temperature on the Magnetic Properties of PrFeB Alloy Fabricated by Gas Atomization
    Autorzy:
    Cho, Ju-Young
    Song, Myung-Suk
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/2049154.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PrFeB alloy
    gas atomization
    plastic deformation
    rolling
    REFeB magnet
    Opis:
    To form the fine micro-structures, the Pr17Fe78B5 magnet powders were produced in the optimized gas atomization conditions and it was investigated that the formation of the textures, microstructures, and the changes in the magnetic properties with increasing the deformation temperatures and rolling directions. Due to the rapid cooling system than the casting process, the homogenous microstructures were composed of the Pr-rich and Pr2Fe14B without any oxides and α-Fe and enables grain refinement. The pore ratios were 2.87, 1.42, and 0.22% at the deformation temperatures of 600, 700, 800°C, respectively in the rolled samples to align the c-axis which is the magnetic easy axis. Because Pr-rich phase cannot flow into the pore with a liquid state at low temperature, the improvement of pore densification was gradually observed with increasing deformation temperature. To confirm the magnetic decoupling effects of Pr2Fe14B phases by Pr-rich phases, the magnetic properties were investigated in rolled samples produced at the deformation temperature of 800°C. Although the remanent field is slightly decreased by 30%, the coercivity fields increased by about 2 times than that previous casted ingot. It is suggested that the gas atomization method can be suitable for fabricating grain refined and pure PrFeB magnets, and the plastic deformation conditions and rolling directions are a critical role to manipulate microstructure and magnetic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 955-958
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Powder Size on the Microstructure and Magnetic Properties of Nd-Fe-B Magnet Alloy
    Autorzy:
    Cho, Ju-Young
    Abbas, Sardar Farhat
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/353634.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Nd-Fe-B
    gas atomization
    powder size
    crystal orientation
    hot deformation
    Opis:
    Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd2 Fe14 B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd2 Fe14 B phase tend to align to c-axis.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 623-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on the Plastic Deformability of Gas Atomized NdFeB Anisotropic Magnets
    Autorzy:
    Cho, Ju-Young
    Choa, Yong-Ho
    Nam, Sun-Woo
    Rasheed, Mohammad Zarar
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/351923.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NdFeB permanent magnet
    stoichiometric composition
    gas atomization
    plastic deformability
    crystal orientation
    Opis:
    NdFeB anisotropic sintered permanent magnets are typically fabricated by strip casting or melt spinning. In this study, the plastic deformability of an NdFeB alloy was investigated to study the possibility of fabricating anisotropic sintered magnets using gas atomized powders. The results show that the stoichiometric composition Nd12Fe82B6 softens at high temperatures. The aspect ratio and orientation factor of Nd12Fe82B6 billets after plastic deformation were found to increase with increasing plastic deformation temperature, particularly above 800°C. This confirms that softening at high temperatures can lead to plastic deformation of Nd2Fe14B hard magnetic phases.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1293-1296
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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