Journal of Powder Materials

[Korean]
Variation of Magnetic Properties of (Nd, Dy)-Fe-B Sintered Magnets with Compaction Conditions: S. NamKung, M.W. Lee, S.J. Han, T.S. Jang; J Korean Powder Metall Inst. 2012;19(1):1-5.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.001

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In order to improve the remanence of (Nd, Dy)-Fe-B sintered magnets, we investigated the influence of compaction conditions such as packing density, applied field and green density on the magnetic properties. While the remanence decreased with increasing the packing density and green density, it increased with the increase of the applied field. In addition, XRD analysis revealed that the remanence was enhanced as the degree of powder alignment was improved. The green density was more influential on the remanence than the packing density and applied field.

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Effect of Cu and DyF3Powder Additions on the Coercivity of Sintered Nd-Fe-B Magnets
S. NamKung, M.W. Lee, D.R. Dhakal, T.H. Lim, T.H. Kim, S.R. Lee, T.S. Jang
Journal of Korean Powder Metallurgy Institute.2012; 19(4): 247. CrossRef

[Korean]
Characteristics of Pt/C Nano-catalyst Synthesized by Arc Plasma Deposition: Hye-Sook Joo, Han-Shin Choi, Heon-Phil Ha, Do-Hyang Kim; J Korean Powder Metall Inst. 2012;19(1):6-12.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.006

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Electricity is generated by the combined reactions of hydrogen oxidation and oxygen reduction which occur on the Pt/C catalyst surface. There have been lots of researches to make high performance catalysts which can reduce Pt utilization. However, most of catalysts are synthesized by wet-processes and a significant amount of chemicals are emitted during Pt/C synthesis. In this study, Pt/C catalyst was produced by arc plasma deposition process in which Pt nano-particles are directly deposited on carbon black surfaces. During the process, islands of Pt nano-particles were produced and they were very fine and well-distributed on carbon black surface. Compared with a commercialized Pt/C catalyst (Johnson & Matthey), finer particle size, narrower size distribution, and uniform distribution of APD Pt/C resulted in higher electrochemical active surface area even at the less Pt content.

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Luminescence Properties of InP/ZnS Quantum Dots depending on InP Core synthesis Temperature
Han Wook Seo, Da-Woon Jeong, Min Young Kim, Seoung Kyun Hyun, Ji Sun On, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2017; 24(4): 321. CrossRef

[Korean]
A Feasibility Study on the Surface Hardening of Sintered Iron Nanopowder by Plasma Ion Nitriding: Joon-Chul Yun, Jai-Sung Lee; J Korean Powder Metall Inst. 2012;19(1):13-18.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.013

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This study has been performed on the full density sintering of Fe nanopowder and the surface hardening by plasma ion nitriding. The Fe sintered part was fabricated by pressureless sintering of the Fe nanopowder at 700°C in which the nanopowder agglomerates were controlled to have 0.5-5 µm sized agglomerates with 150 nm Fe nanopowders. The green compact with 46% theoretical density(T.D.) showed a homogeneous microstructure with fine pores below 1 µm. After sintering, the powder compact underwent full densification process with above 98%T.D. and uniform nanoscale microstructure. This enhanced sintering is thought to be basically due to the homogeneous microstructure in the green compact in which the large pores are removed by wet-milling. Plasma ion nitriding of the sintered part resulted in the formation of gamma'-Fe_4N equilibrium phase with about 12 µm thickness, leading to the surface hardening of the sintered Fe part. The surface hardness was remarkably increased from 176 H_v for the matrix to 365 H_v.

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Sintering behavior of bimodal iron nanopowder agglomerates
Jun‐ll Song, Geon‐Yong Lee, Eui‐Jin Hong, Carolline S. Lee, Jai‐Sung Lee
Journal of the American Ceramic Society.2019; 102(6): 3791. CrossRef
Densification and microstructural development during sintering of powder injection molded Fe micro–nanopowder
Joon-Phil Choi, Hyun-Gon Lyu, Won-Sik Lee, Jai-Sung Lee
Powder Technology.2014; 253: 596. CrossRef

[English]
Fundamental Aspects of Resistance Sintering under Ultrahigh Pressure Consolidation: Zhangjian Zhou, Ji-Soon Kim, Young-Jin Yum; J Korean Powder Metall Inst. 2012;19(1):19-24.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.019

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The consolidation results of fine tungsten powders, W-Cu composite and W/Cu FGM by using a novel method combining resistance sintering with ultra high pressure have been reviewed. The densification effects of the consolidation parameters, including pressure, input power and sintering time, have been investigated. The sintering mechanism of this method was quite different from other sintering methods. Particle rearrangement, sliding, distortion and crushing due to the ultra high pressure are the dominant mehanisms at the initial stage, then the dominant sintering mechanisms are transient arc-fused processes controlled by the input power.

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Fabrication of W-Cu alloy via combustion synthesis infiltration under an ultra-gravity field
Yuepeng Song, Qian Li, Jiangtao Li, Gang He, Yixiang Chen, Hyoung Seop Kim
Metals and Materials International.2014; 20(6): 1145. CrossRef

[Korean]
Densification and Microstructure of Ultrafine-sized AlN Powder Prepared by a High Energy Ball Milling Process: Hae-Ryong Park, Young-Do Kim, Sung-Soo Ryu; J Korean Powder Metall Inst. 2012;19(1):25-31.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.025

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Abstract PDF: In this study, a high energy ball milling process was employed in order to improve the densification of direct nitrided AlN powder. The densification behavior and the sintered microstructure of the milled AlN powder were investigated. Mixture of AlN powder doped with 5 wt.% Y_2O_3 as a sintering additive was pulverized and dispersed up to 50 min in a bead mill with very small ZrO_2 beads. Ultrafine AlN powder with a particle size of 600 nm and a specific surface area of 9.54 m2/g was prepared after milling for 50 min. The milled powders were pressureless-sintered at 1700°C-1800°C for 4 h under N_2 atmosphere. This powder showed excellent sinterability leading to full densification after sintering at 1700°C for 4 h. However, the sintered microstructure revealed that the fraction of yitttium aluminate increased with milling time and sintering temperature and the newly-secondary phase of ZrN was observed due to the reaction of AlN with the ZrO_2 impurity.

[Korean]
Quantitative Study on the Refinement Behaviors of TiC Powders Produced by Mechanical Milling Under Different Impact Energy: Sung-Mo Hong, Eun-Kwang Park, Kyeong-Yeol Kim, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Jin-Kyu Lee, Young-Soon Kwon; J Korean Powder Metall Inst. 2012;19(1):32-39.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.032

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This study investigated refinement behaviors of TiC powders produced under different impact energy conditions using a mechanical milling process. The initial coarse TiC powders with an average diameter of 9.3 µm were milled for 5, 20, 60 and 120 mins through the conventional low energy mechanical milling (LEMM, 22G) and specially designed high energy mechanical milling (HEMM, 65G). TiC powders with angular shape became spherical one and their sizes decreased as the milling time increased, irrespective of milling energy. Based upon the FE-SEM and BET results of milled powders, it was found initial coarse TiC powders readily became much finer near 100 nm within 60 min under HEMM, while their sizes were over 200 nm under LEMM, despite the long milling time of up to 120 min. Particularly, ultra-fine TiC powders with an average diameter of 77 nm were fabricated within 60 min in the presence of toluene under HEMM.

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Effect of High Temperature on Microstructure and Hardness of Ti-6Al-4Dy Alloy by High Energy Ball Milling and Spark Plasma Sintering
Donhee Lee, Junwoo Ga, Man Ho Park, Si Young Chang
Journal of the Japan Society of Powder and Powder Metallurgy.2025; 72(Supplement): S787. CrossRef
Compaction and Sintering Characteristics of High Energy Ball Milled Mn-Zn Ferrite Powders
Hyunseung Lee, Hoseong Rhee, Sangsoo Lee, Si Young Chang
Korean Journal of Materials Research.2021; 31(12): 677. CrossRef
Fabrication of titanium carbide nano-powders by a very high speed planetary ball milling with a help of process control agents
Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Kyeong-Youl Kim, Jung-Gu Lee, Min-Ku Lee, Chang-Kyu Rhee, Jin Kyu Lee
Powder Technology.2015; 274: 393. CrossRef
Control of Y2O3 phase and its nanostructure formation through a very high energy mechanical milling
M.K. Lee, E.K. Park, J.J. Park, C.K. Rhee
Journal of Solid State Chemistry.2013; 201: 56. CrossRef
Fabrication of Fe coated Mg Based Desulfurization Powder by Mechanical Alloying Process
Joon-Woo Song, Otaduy Guillermo, Byong-Sun Chun, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 226. CrossRef
Synthesis and structural properties of Ni–20Cr–2Y2O3 nanocomposite alloy prepared by a very high energy mechanical milling
M.K. Lee, J.J. Park, C.K. Rhee
Materials Chemistry and Physics.2012; 137(1): 129. CrossRef

[English]
Electroexplosive Technology of Nanopowders Production: Current Status and Future Prospects: Young-Soon Kwon, Jin-Chun Kim, Alexander P. Ilyin, Olga B. Nazarenko, Dmitry V. Tikhonov; J Korean Powder Metall Inst. 2012;19(1):40-48.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.040

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The current situation of the nanopowders production technology based on the process of electrical explosion of wires is described. The advantages and disadvantages of the electroexplosive technology are indicated. The results of studies characterizing the effect of the electrical explosion conditions on the nanopowders properties are presented, including latest results: conditions of nanopowders passivation, conditions of nanopowders production having narrow size distribution, the methods of nanopowders diagnostic and standartization. In addition, the application and area of future research on this technology are proposed.

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Characterization of Naturally Aged Iron Nanopowder Produced by Electrical Explosion of Wires
Olga B. Nazarenko, Alexander I. Sechin, Yuliya A. Amelkovich
Metals and Materials International.2021; 27(5): 962. CrossRef
Development of Effectual Substrates for SERS by Nanostructures-on flexible surfaces
Hammad R. Humud, Fatimah Jumaah Moaen
Journal of Physics: Conference Series.2021; 2114(1): 012084. CrossRef
Influence of Factors Affecting the Parameters of Combustion of Aluminum Nanopowders in the Bulk Layer
Alexander I. Sechin, Olga B. Nazarenko, Yuliya A. Amelkovich, Andrey A. Sechin
Materials Science Forum.2019; 970: 257. CrossRef
Effect of electron beam irradiation on thermal and mechanical properties of aluminum based epoxy composites
P.M. Visakh, O.B. Nazarenko, C. Sarath Chandran, T.V. Melnikova, S.Yu. Nazarenko, J.-C. Kim
Radiation Physics and Chemistry.2017; 136: 17. CrossRef
Investigation of coatings produced by the electrospark machining method of steel 45 with electrodes based on carbides of tungsten and titanium
S. V. Nikolenko, N. A. Syui
Protection of Metals and Physical Chemistry of Surfaces.2017; 53(5): 889. CrossRef
Influence of long-term storage on fire hazard properties of metal nanopowders
O S Kyrmakova, A I Sechin, O B Nazarenko
Journal of Physics: Conference Series.2017; 881: 012027. 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
Characterization of copper nanopowders after natural aging
Yu A Amelkovich, O B Nazarenko, A I Sechin, P M Visakh
IOP Conference Series: Materials Science and Engineering.2015; 81: 012072. CrossRef
Characterization of aluminum nanopowders after long-term storage
O.B. Nazarenko, Yu.A. Amelkovich, A.I. Sechin
Applied Surface Science.2014; 321: 475. CrossRef
Effect of the Gas Composition at the Electrical Explosion of Wires on the Nanopowders Properties
Olga B. Nazarenko, Alexander P. Ilyin, Dmitry V. Tikhonov
Advanced Materials Research.2013; 872: 142. CrossRef
Prospects of Using Nanopowders as Flame Retardant Additives
Olga B. Nazarenko, Yulia A. Amelkovich, Alexander P. Ilyin, Alexander I. Sechin
Advanced Materials Research.2013; 872: 123. CrossRef

[English]
Effect of Electrical Parameters and Surrounding Gas on the Electroexplosive Tungsten Nanopowders Characteristics: Young-Soon Kwon, Jin-Chun Kim, Alexander P. Ilyin, Olga B. Nazarenko, Dmitry V. Tikhonov; J Korean Powder Metall Inst. 2012;19(1):49-54.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.049

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Tungsten nanopowders were produced by the method of wires electrical explosion in the different gases. The study of phase and dispersed composition of the powders was carried out. The influence of electrical parameters such as the value of energy input in wire and the arc stage of the explosion was discussed. The factors that make for decreasing the particles size are the lower pressure of surrounding gas and the use of addition of chemically reactive gas.

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Comparison of different tungsten precursors for preparation of tungsten nanopowder by RF induction thermal plasma
Dongyoon Shin, Basudev Swain, Chulwoong Han, Yonghwan Kim, Chan-Gi Lee, Kyung-Soo Park
International Journal of Refractory Metals and Hard Materials.2020; 86: 104995. CrossRef
Facile Synthesis of Single-Phase Alpha-Tungsten Nanopowders from Ammonium Paratungstate by RF Induction Thermal Plasma and Thermochemical Reduction
Dongyoon Shin, Hyun-Woo Shim, Basudev Swain, Kyung-Soo Park, Chan-Gi Lee
Korean Journal of Metals and Materials.2020; 58(11): 798. CrossRef
In-situ synthesis of tungsten nanoparticle attached spherical tungsten micro-powder by inductively coupled thermal plasma process
Chulwoong Han, Hyunwoong Na, Yonghwan Kim, Hanshin Choi
International Journal of Refractory Metals and Hard Materials.2015; 53: 7. CrossRef
Characterization of aluminum nanopowders after long-term storage
O.B. Nazarenko, Yu.A. Amelkovich, A.I. Sechin
Applied Surface Science.2014; 321: 475. CrossRef

[English]
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

[Korean]
Synthesis of Platinum Nanoparticles by Liquid Phase Reduction: Jin-Ho Lee, Se-Hoon Kim, Jin-Woo Kim, Min-Ha Lee, Young-Do Kim; J Korean Powder Metall Inst. 2012;19(1):60-66.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.060

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In this study, Platinum(Pt) nanoparticles were synthesized by using polyol process which is one of the liquid phase reduction methods. Dihydrogen hexachloroplatinate (IV) hexahydrate (H_2PtCl_6cdot6H_2O), as a precursor, was dissolved in ethylene glycol and silver nitrate (AgNO_3) was added as metal salt for shape control of Pt particle. Also, polyvinylpyrrolidone (PVP), as capping agent, was added to reduce the size of particle and to separate the particles. The size of Pt nanoparticles was evaluated particle size analyzer (PSA). The size and morphology of Pt nanoparticles were observed by transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Synthesized Pt nanoparticles were studied with varying time and temperature of polyol process. Pt nanoparticles have been successfully synthesized with controlled sizes in the range 5-10 and 20-40 nm with cube and multiple-cube shapes.

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Facile Strategy for Mass Production of Pt Catalysts for Polymer Electrolyte Membrane Fuel Cells Using Low-Energy Electron Beam
Jongmin Shin, Jiho Min, Youngjin Kim, Jin Hee Lee, Geunseok Chai, Namgee Jung
Nanomaterials.2020; 10(11): 2216. CrossRef
Synthesis of Nanosized Nickel Particle from Spent Cathodic Material Containing Lithium
Jei-Pil Wang
Journal of Korean Powder Metallurgy Institute.2019; 26(4): 340. 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

[English]
Atom Probe Tomography: A Characterization Method for Three-dimensional Elemental Mapping at the Atomic Scale: Pyuck-Pa Choi, Ivan Povstugar; J Korean Powder Metall Inst. 2012;19(1):67-71.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.067

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The present paper gives an overview about the Atom Probe Tomography technique and its application to powder materials. The preparation of needle-shaped Atom Probe specimens from a single powder particle using focused-ion-beam milling is described. Selected experimental data on mechanically alloyed (and sintered) powder materials are presented, giving insight into the atomic-scale elemental redistribution occurring under powder metallurgical processing.

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Scanning electron microscopy imaging of multilayer-doped GaN: Effects of surface band bending, surface roughness, and contamination layers on doping contrast
Siyuan Wang, Kai Zhang, Le Zhai, Li Huang
Journal of Vacuum Science & Technology A.2024;[Epub] CrossRef

[Korean]
Investigation on Recycling in Material Flow on Indium Demand Industry: Jeong-Gon Kim; J Korean Powder Metall Inst. 2012;19(1):72-78.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.072

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Recovery of Valuable Metal from e-Wasted Electronic Devices
Yu-Sang Kim
Journal of the Korean institute of surface engineering.2016; 49(6): 477. CrossRef
Selective Solvent Extraction of In from Synthesis Solution of MOCVD Dust using D2EHPA
Byoungyong Im, Basudev Swain, Chan Gi Lee, Jae Layng Park, Kyung-Soo Park, Jong-Gil Shim, Jeung-Jin Park
Journal of the Korean Institute of Resources Recycling.2015; 24(5): 80. CrossRef
Recovery of Indium for the Recycling of End-of-life Flat Panel Display Devices
Sunghyun Uhm, Sungsu Cho, Sooyoung Lee
Applied Chemistry for Engineering.2015; 26(4): 389. CrossRef

[Korean]
Industrial Supply Chain Trend of Domestic Tungsten: Joon-Woo Song, Sang-Hyun Lee, Hyun-Seon Hong, Hong-Yoon Kang, Soon-Jik Hong; J Korean Powder Metall Inst. 2012;19(1):79-86.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.079

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Extraction Factor Of Tungsten Sources From Tungsten Scraps By Zinc Decomposition Process
J.-H. Pee, G.H. Kim, H.Y. Lee, Y.J. Kim
Archives of Metallurgy and Materials.2015; 60(2): 1311. CrossRef
Microstructure and Elevated Temperature Strength of W-ZrC Composites with Micrometric and Nanosized ZrC Particles
Yoon Soo Han, Sung-Soo Ryu
Journal of Korean Powder Metallurgy Institute.2014; 21(6): 415. CrossRef
Investigation of Material Flow and Industrial Trend of Domestic Europium
Han-Jin Ko, Jeong-Gon Kim, Il-Seuk Lee, Hong-Yoon Kang, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2013; 20(5): 382. CrossRef

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