Journal of Powder Materials

B.K. Kim

3 Articles

Characterization and Stability of Silver Nanoparticles in Aqueous Solutions: L.H. Bac, W.H. Gu, J.C. Kim, B.K. Kim, J.S. Kim; J Korean Powder Metall Inst. 2012;19(1):55-59.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.055

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In this work, the silver nanoparticles have been synthesized by electrical explosion of wire in three liquid mediums: deionized water (DIW), polyvinylpyrrolidone (PVP) and sodium dodecyl benzene sulfonate (SDBS) solutions. Absorption in the UV-visible region of these suspensions was measured in the range of 300-800 nm. A surface plasmon peak was observed at ~400 nm in all suspensions in measured wavelength range. Particle size was analyzed by transmission electron microscope. It showed that the particles had nearly spherical shape in all samples. The average particle sizes prepared in DIW, PVP and SDBS solution were 37, 31 and 27 nm, respectively. Stability of the suspensions was estimated by multiple light scattering method. The presence of PVP and SDBS surfactants in the exploding medium resulted in enhanced stability of the silver suspensions.

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Plasma-chemical Synthesis of Silver Nanoparticles in the Presence of Citrate
Margarita Skіba, Alexander Pivovarov, Anna Makarova, Victoria Vorobyova
Chemistry Journal of Moldova.2018; 13(1): 7. CrossRef
Fabrication and Characterization of Ag Particles by Polyol Process and Wet Chemical Process
Juyeon Yoo, Hyosung Jang, Kun-Jae Lee
Journal of Korean Powder Metallurgy Institute.2016; 23(4): 297. CrossRef
A Study of the Preparation and Properties of Antioxidative Copper Inks with High Electrical Conductivity
Chia-Yang Tsai, Wei-Chen Chang, Guan-Lin Chen, Cheng-Huan Chung, Jun-Xiang Liang, Wei-Yang Ma, Tsun-Neng Yang
Nanoscale Research Letters.2015;[Epub] CrossRef
Fabrication of Micro Pattern on Flexible Substrate by Nano Ink using Superhydrophobic Effect
Soo-Jung Son, Young-Sang Cho, Jong Joo Rha, Chul-Jin Cho
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 120. CrossRef

Improvement of Microstructural Anisotropy of Nd-Fe-B-Ga-Nb Alloy by the Control of Hydrogen Reaction: S.H. Lee, D.H. Kim, J.H. Yu, D.W. Lee, B.K. Kim; J Korean Powder Metall Inst. 2010;17(1):23-28.; DOI: https://doi.org/10.4150/KPMI.2010.17.1.023

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Abstract PDF: HDDR treated anisotropic Nd-Fe-B powders have been widely used for the sheet motors and the sunroof motors of hybrid or electric vehicles, due to their excellent magnetic properties. Microstructural alignment of HDDR treated powders are mostly depending on the hydrogen reaction in disproportionation step, so the specific method to control hydrogenation reaction is required for improving magnetic properties. In disproportionation step, hydrogenation pressure and reaction time were controlled in the range of 0.15~1.0 atm for 15~180 min in order to control the micorstructural alignment of Nd_2Fe_14B phase and, at the same time, to improve remanence of HDDR treated magnet powders. In this study, we could obtain a well aligned anisotropic Nd-Fe-B-Ga-Nb alloy powder having high remanence of 12 kG by reducing hydrogen pressure down to 0.3 atm in disproportionation step.

Effect of Homogenization Treatment on Magnetic Properties of HDDR Treated Nd-Fe-Ga-Nb-B Alloy: J.H. Yu, S.H. Lee, D.H. Kim, D.W. Lee, B.K. Kim, M.H. Choi, Y.D. Kim; J Korean Powder Metall Inst. 2009;16(4):285-290.; DOI: https://doi.org/10.4150/KPMI.2009.16.4.285

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Abstract PDF: HDDR treated anisotropic Nd-Fe-B powders have been widely used, due to their excellent magnetic properties, especially for sheet motors and sunroof motors of hybrid and electric vehicles. Final microstructure and coercivity of such Nd-Fe-B powders depend on the state of starting mother alloys, so additional homogenization treatment is required for improving magnetic properties of them. In this study, a homogenization treatment was performed at 900sim1140°C in order to control the grain size and Nd-rich phase distribution, and at the same time to improve coercivity of the HDDR treated magnetic powders. FE-SEM was used for observing grain size of the HDDR treated powder and EPMA was employed to observe distribution of Nd-rich phase. Magnetic properties were analyzed with a vibrating sample magnetometer.

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