Journal of Powder Materials

Jung-Goo Lee

6 Articles

Synthesis of Nickel and Copper Nanopowders by Plasma Arc Evaporation: Young-Sang Cho, Jong Woo Moon, Kook Chae Chung, Jung-Goo Lee; J Korean Powder Metall Inst. 2013;20(6):411-424.; DOI: https://doi.org/10.4150/KPMI.2013.20.6.411

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In this study, the synthesis of nickel nanoparticles and copper nanospheres for the potential applications of MLCC electrode materials has been studied by plasma arc evaporation method. The change in the broad distribution of the size of nickel and copper nanopowders is successfully controlled by manifesting proper mixture of gas ambiance for plasma generation in the size range of 20 to 200 nm in diameter. The factors affecting the mean diameter of the nanopowder was studied by changing the composition of reactive gases, indicating that nitrogen enhances the formation of larger particles compared to hydrogen gas. The morphologies and particle sizes of the metal nanoparticles were observed by SEM, and ultrathin oxide layers on the powder surface generated during passivation step have been confirmed using TEM. The metallic FCC structure of the nanoparticles was confirmed using powder X-ray diffraction method.

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Arc Discharge Synthesis of Chitosan‐Mediated Copper Nanoparticles for Heterogeneous Catalysis in 4‐Nitrophenol Degradation
Noor Azfarena Ahmad, Mohammad Taghi Hajibeigy, Mohsen Nabi Poor, Aras Kartouzian, Hassan Moeini, Kamyar Shameli
Particle & Particle Systems Characterization.2024;[Epub] CrossRef
Tribological properties and tribomechanism of nickel nanoparticles in-situ synthesized in rapeseed oil
Wenya Xu, Guangbin Yang, Shengmao Zhang, Jun Xu, Yujuan Zhang, Tianhua Sun, Ningning Song, Laigui Yu, Pingyu Zhang
Friction.2024; 12(3): 474. CrossRef
Oxidative Steam Reforming of Methanol over Cu-Based Catalysts
Matteo Tommasi, Davide Ceriotti, Alice Gramegna, Simge Naz Degerli, Gianguido Ramis, Ilenia Rossetti
Catalysts.2024; 14(11): 759. CrossRef
Functional metal powders: Design, properties, applications, and prospects
Xin Wang, Haitao Yang, Xiaohua Yu, Chaoquan Hu, Jiacheng Hu, Rongxing Li, Yingzhi Zhang
Materials Science and Engineering: B.2022; 280: 115708. CrossRef
Facile synthesis of Cu and CuO nanoparticles from copper scrap using plasma arc discharge method and evaluation of antibacterial activity
S. B. Tharchanaa, K. Priyanka, K. Preethi, G. Shanmugavelayutham
Materials Technology.2021; 36(2): 97. CrossRef
Fabrication of Hollow or Macroporous Silica Particles by Spray Drying of Colloidal Dispersion
Young-Sang Cho
Journal of Dispersion Science and Technology.2016; 37(1): 23. CrossRef
Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Y.-S. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1221. CrossRef

Size Control of Nd-Fe-B Precursor Particles Prepared by Spray Drying and Its Effect on the Magnetic Properties of Nd-Fe-B Alloy Powders after Reduction-Diffusion: Youn-Kyoung Baek, Young-Taek Seo, Jung-Goo Lee, Dong Su Kim, Dong Sik Bae, Chul-Jin Choi; J Korean Powder Metall Inst. 2013;20(5):359-365.; DOI: https://doi.org/10.4150/KPMI.2013.20.5.359

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In this study, we fabricated Nd_2Fe_14B hard magnetic powders with various sizes via spray drying combined with reduction-diffusion process. Spray drying is widely used to produce nearly spherical particles that are relatively homogeneous. Thus, the precursor particles were prepared by spray drying using the aqueous solution containing Nd salts, Fe salts and boric acid with the target stoichiometric composition of Nd_2Fe_14B. The mean particle sizes of the spray-dried powders are in the range from one to seven micrometer, which are adjusted by controlling the concentrations of precursor solutions. After debinding the as-prepared precursor particles, ball milling was also conducted to control the particle sizes of Nd-Fe-B oxide powders. The resulting particles with different sizes were subjected to subsequent treatments including hydrogen reduction, Ca reduction and washing for CaO removal. The size effect of Nd-Fe-B oxide particles on the formation of Nd_2Fe_14B phase and magnetic properties was investigated.

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Research trend in Fabrication of Metastable-phase Iron Nitrides for Hard Magnetic Applications
Kyung Min Kim, Jung-Goo Lee, Kyung Tae Kim, Youn-Kyoung Baek
Journal of Korean Powder Metallurgy Institute.2019; 26(2): 146. CrossRef
Synthesize of Nd₂Fe₁₄B Powders from 1-D Nd₂Fe₁₄B Wires using Electrospinning Process
Nu Si A Eom, Su Noh, Muhammad Aneeq Haq, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2019; 26(6): 477. CrossRef

The Effect of Mn Addition on Nitrogenation Behavior and Magnetic Properties of Sm-Fe Alloy Powder Produced by Reduction-diffusion Method: Young-Taek Seo, Youn-Kyoung Baek, Jung-Goo Lee, Chul-Jin Choi; J Korean Powder Metall Inst. 2013;20(1):13-18.; DOI: https://doi.org/10.4150/KPMI.2013.20.1.013

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In the present study, we systematically investigated the effect of Mn addition on nitrogenation behavior and magnetic properties of Sm-Fe powders produced by reduction-diffusion process. Alloy powders with only Sm_2(Fe,Mn)_17 single phase were successfully produced by the reduction-diffusion process. The coercivity of Sm_2(Fe,Mn)_17 powder rapidly increased during nitrogenation and reached the maximum of 637 Oe after 16 hours. After further nitrogenation, it decreased. In contrast, the coercivity of Sm_2Fe_17 powder gradually increased during nitrogenation for 24 hours. The coercivity of Sm_2(Fe,Mn)_17 powder was higher than that of Sm_2Fe_17 powder at the same condition of nitrogenation. It was considered that the Mn addition facilitates the nitrogenation of Sm_2Fe_17 powder and enhances the coercivity.

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Effect of Nb content on Sm2Fe17−xNbx and its nitrides prepared by reduction-diffusion method
Guizhi Yao, Haiming Tian, Cong Zhang, Huan Shi, Shifan Zeng, Sheng Gao, Shuangjiu Feng, Kai Zhu, Xucai Kan, Xiansong Liu
Journal of Materials Science: Materials in Electronics.2024;[Epub] CrossRef

Trend in Research and Development Related to Lean Heavy Rare-earth Permanent Magnets for Next-generation Motors: Jung-Goo Lee, Youn-Kyoung Baek, Ji-Hun Yu, Chul-Jin Choi; J Korean Powder Metall Inst. 2012;19(2):151-159.; DOI: https://doi.org/10.4150/KPMI.2012.19.2.151

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Study on the Demagnetization and Classification of NdFeB Magnets According to Different Heat Treatment Temperatures
Byeong Jun Kim, Ik Keun Park, Young Sung Kim
Journal of the Korean Society of Manufacturing Technology Engineers.2021; 30(2): 119. CrossRef
Low Cost Design Study of Brushless DC Motor for Electric Water Pump Application
Tae-Uk Jung
Journal of Electrical Engineering and Technology.2014; 9(3): 942. CrossRef
Optimized Design of Rotor Considering Cost-Reduction of Small BLDC Motor for the Water Pump
Hoe-Cheon Kim, Tae-Uk Jung
The Transactions of The Korean Institute of Electrical Engineers.2013; 62(4): 495. CrossRef

The Effect of Excess Samarium Oxide on the Preparation of Sm-Fe Alloy Powder by Reduction-diffusion Method: Hun Kwak, Jung-Goo Lee, Chul-Jin Choi; J Korean Powder Metall Inst. 2009;16(5):336-341.; DOI: https://doi.org/10.4150/KPMI.2009.16.5.336

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To produce alloy powders with only Sm_2Fe_17 single phase by reduction-diffusion (R-D) method, the effect of excess samarium oxide on the preparation of Sm-Fe alloy powder during R-D heat treatment was studied. The quantity of samarium oxide was varied from 5% to 50% whereas iron and calcium were taken 0% and 200% in excess of chemical equivalent, respectively. The pellet type mixture of samarium, iron powders and calcium granulars was subjected to heat treatment at 1100°C for 5 hours. The R-D treated pellet was moved into deionized water and agitated to separate Sm-Fe alloy powders. After washing them in deionized water several times, the powders were washed with acetic acid to remove the undesired reaction products such as CaO. By these washing and acid cleaning treatment, only 0.03 wt% calcium remained in Sm-Fe alloy powders. It was also confirmed that the content of unreacted alpha-Fe in Sm_2Fe_17 matrix gradually decreased as the percentage of samarium oxide is increased. However, there was no significant change above 40% excess samarium oxide.

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The Influence of Mechanical Milling on the Structure and Magnetic Properties of Sm-Fe-N Powder Produced by the Reduction-Diffusion Process
Jung-Goo Lee, Seok-Won Kang, Ping-Zhan Si, Chul-Jin Choi
Journal of Magnetics.2011; 16(2): 104. CrossRef

Trend in Research and Development Related to Sm-Fe-N Bonded Magnets: Jung-Goo Lee, Hun Kwak, Chul-Jin Choi, Joon-Chul Yun, Jai-Sung Lee; J Korean Powder Metall Inst. 2009;16(1):1-8.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.001

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Advanced Magnetic Actuation: Harnessing the Dynamics of Sm2Fe17–xCuxN3 Composites
Kangmo Koo, Young-Tae Kwon, Ji Young Park, Yong-Ho Choa
ACS Applied Materials & Interfaces.2024; 16(9): 11872. CrossRef

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