Journal of Powder Materials

Volume 17(3); June 2010

Overview and Future Concerns for Lithium-Ion Batteries Materials: Hang-Chul Jung, Geon-Hong Kim, Hyun-Seon Hong, Dong-Wan Kim; J Korean Powder Metall Inst. 2010;17(3):175-189.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.175

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Fabrication of Nanowire by Electrospinning Process Using Nickel Oxide Particle Recovered from MLCC
Haein Shin, Jongwon Bae, Minsu Kang, Kun-Jae Lee
journal of Korean Powder Metallurgy Institute.2023; 30(6): 502. CrossRef
Changes in Electrical Properties of Copper-Plated Layer by Organic Additives on High Current Density
Tae-Gyu Woo, Il-Song Park
Korean Journal of Metals and Materials.2020; 58(1): 41. CrossRef
A Study on the Recovery of Li2CO3 from Cathode Active Material NCM(LiNiCoMnO2) of Spent Lithium Ion Batteries
Jei-Pil Wang, Jae-Jung Pyo, Se-Ho Ahn, Dong-Hyeon Choi, Byeong-Woo Lee, Dong-Won Lee
Journal of Korean Powder Metallurgy Institute.2018; 25(4): 296. CrossRef
Effect of Gelatin and Chloride Ions on the Mechanical Properties and Microstructural Evolution of Copper Foil
Tae-Gyu Woo, Man-Hyung Lee, Kyeong-Won Seol
Korean Journal of Metals and Materials.2018; 56(7): 518. CrossRef
Main Effects of Plating Parameters on Mechanical and Surface Properties of Electroplated Copper
Tae-Gyu Woo, Il-Song Park, Kyeong-Won Seol
Korean Journal of Metals and Materials.2018; 56(6): 459. CrossRef
Solvent Extraction of Co, Ni and Mn from NCM Sulfate Leaching Solution of Li(NCM)O2 Secondary Battery Scraps
Hyun Seon Hong, Dae Weon Kim, Hee Lack Choi, Sung-Soo Ryu
Archives of Metallurgy and Materials.2017; 62(2): 1011. CrossRef
The effect of additives and current density on mechanical properties of cathode metal for secondary battery
Tae-Gyu Woo, Il-Song Park, Kyeong-Won Seol
Electronic Materials Letters.2013; 9(4): 535. CrossRef
Recovery of Lithium and Leaching Behavior of NCM Powder by Carbon Reductive Treatment from Li(NCM)O2System Secondary Battery Scraps
Dae Weon Kim, Seong Tae Jang
Journal of the Korean Institute of Resources Recycling.2013; 22(4): 62. CrossRef
Recovery of Lithium and Leaching Behavior of NCM Powder by Hydrogen Reductive Treatment from NCM System Li-ion Battery Scraps
Dae Weon Kim, Seong Tae Jang, Kyung Min Baek
Journal of the Korean Institute of Resources Recycling.2013; 22(3): 43. CrossRef
Industrial Supply Chain Trend of Domestic Tungsten
Joon-Woo Song, Sang-Hyun Lee, Hyun-Seon Hong, Hong-Yoon Kang, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 79. CrossRef
Research and Development Status of Low-Cost Fe-based Cathode Materials for Lithium Secondary Batteries
Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Hang-Chul Jung, Geon-Hong Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 196. CrossRef
Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method
Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Geon-Hong Kim, Hang-Chul Jung
Journal of Korean Powder Metallurgy Institute.2011; 18(3): 244. CrossRef

Consolidation and Mechanical Behavior of Gas Atomized MgZn_4.3Y_0.7 Alloy Powders using High Pressure Torsion: Eun-Yoo Yoon, Hong-Jun Chae, Taek-Soo Kim, Chong-Soo Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2010;17(3):190-196.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.190

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In this paper, rapid solidified Mg-4.3Zn-0.7Y (at.%) alloy powders were prepared using an inert gas atomizer, followed by a severe plastic deformation technique of high pressure torsion (HPT) for consolidation of the powders. The gas atomized powders were almost spherical in shape, and grain size was as fine as less than 5;µm due to rapid solidification. Plastic deformation responses during HPT were simulated using the finite element method, which shows in good agreement with the analytical solutions of a strain expression in torsion. Varying the HPT processing temperature from ambient to 473 K, the behavior of powder consolidation, matrix microstructural evolution and mechanical properties of the compacts was investigated. The gas atomized powders were deformed plastically as well as fully densified, resulting in effective grain size refinements and enhanced microhardness values.

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Trend in Research of Powder Consolidation Using Severe Plastic Deformation
Eun Yoo Yoon, Dong Jun Lee, Dong-Hyun Ahn, Hyuk Jae Jeong, Hyoung Seop Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 148. CrossRef
Densification of Copper Powders using High-pressure Torsion Process
Dong-Jun Lee, Eun-Yoo Yoon, Soo-Young Kang, Jung-Hwan Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 333. CrossRef
Ultrafine Grained Cu-diamond Composites using High Pressure Torsion
Eun-Yoo Yoon, Dong-Jun Lee, Taek-Soo Kim, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 204. CrossRef
Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion
Eun-Yoo Yoon, Dong-Jun Lee, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(5): 411. CrossRef

Direct Observation on the Low Temperature Degradation Due to Surface Treatment in Y-TZP: Tai-Joo Chung, Hye-Sung Kim; J Korean Powder Metall Inst. 2010;17(3):197-202.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.197

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Abstract PDF: Low temperature degradation behavior in yttria stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics was microscopically observed from the phase contrast between monoclinic surface and tetragonal matrix. The degradation behavior was dependent on the surface treatment of sintered Y-TZP, even if the sintering history is same. In the mirror polished specimen, the monoclinic layer appeared in a uniform thickness from the surface. On the contrary, for the specimen with coarse scratch, the thickness of degraded surface was more than double especially from the coarse scratch. Since the scratch results in local deformation, the residual stress should be induced around the scratch. With the transformation from tetragonal to monoclinic, the volume expansion exerts a stress on a neighboring grains and promotes a successive phase transformation. Such a autocatalytic effect can be triggered from the part of coarse scratch.

Microstructure and Mechanical Properties of Al₂O₃/Fe-Ni Nanocomposite Prepared by Rapid Sintering: Young-In Lee, Kun-Jae Lee, Dae-Hwan Jang, Jae-Kyo Yang, Yong-Ho Cho; J Korean Powder Metall Inst. 2010;17(3):203-208.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.203

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Abstract PDF: A new High Frequency Induction Heating (HFIH) process has been developed to fabricate dense Al_2O_3 reinforced with Fe-Ni magnetic metal dispersion particles. The process is based on the reduction of metal oxide particles immediately prior to sintering. The synthesized Al_2O_3/Fe-Ni nanocomposite powders were formed directly from the selective reduction of metal oxide powders, such as NiO and Fe_2O_3. Dense Al_2O_3/Fe-Ni nanocomposite was fabricated using the HFIH method with an extremely high heating rate of 2000°C/min. Phase identification and microstructure of nanocomposite powders and sintered specimens were determined by X-ray diffraction and SEM and TEM, respectively. Vickers hardness experiment were performed to investigate the mechanical properties of the Al_2O_3/Fe-Ni nanocomposite.

Effect of Al Precursor Type on Mesoporous Alumina Particles Prepared by Spray Pyrolysis: Joo-Hyun Kim, Kyeong-Youl Jung, Kyun-Young Park; J Korean Powder Metall Inst. 2010;17(3):209-215.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.209

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Abstract PDF: Mesoporous alumina particles were prepared by spray pyrolysis using cetyltrimethyl-ammonium bromide (CTAB) as a structure directing agent and the effect of Al precursor types on the texture properties was studied using N_2 adsorption isotherms, small-angle X-ray scattering (SAXS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The surface area and the microstructure of alumina particles were significantly influenced by the Al precursor type. The largest BET surface area was obtained when Al chloride was used, whereas alumina particles prepared from Al acetate had the largest pore volume. According to small-angle X-ray scattering (SAXS) analysis, the alumina powders prepared using nitrate and acetate precursors had a clear single SAXS peak around 2theta=1.0sim1.5°, indicating that regular mesopores with sponge-like structure were produced. On the basis of TEM, SAXS, and N_2 isotherm results, the chloride precursor was most profitable to obtain the largest surface area (265;m2/g), whereas, the nitrate precursor is useful for the preparation of non-hollow mesoporous alumina with regular pore size, maintaining high surface area (sim233;m2/g).

Fabrication of TiO₂ Nanotube Arrays by Anodic Oxidation Method and its Photoelectrochemical Properties: Seon-Min Kim, Kwon-Koo Cho, Yeong-Jin Choe, Ki-Won Kim, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2010;17(3):216-222.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.216

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Self-standing TiO_2 nanotube arrays were fabricated by potentiostatic anodic oxidation method using pure Ti foil as a working electrode and ethylene glycol solution as electrolytes with small addition of NH_4F and H_2O. The influences of anodization temperature and time on the morphology and formation of TiO_2 nanotube arrays were investigated. The fabricated TiO_2 nanotube arrays were applied as a photoelectrode to dye-sensitized solar cells. Regardless of anodizing temperature and time, the average diameter and wall thickness of TiO_2 nanotube show a similar value, whereas the thickness show a different trend with reaction temperature. The thickness of TiO_2 nanotube arrays anodized at 20°C and 30°C was time-dependent, but on the other hand its at 10°C are independent of anodization time. The conversion efficiency is low, which is due to a morphology breaking of the TiO_2 nanotube arrays in manufacturing process of photoelectrode.

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The growth and morphology of copper phthalocyanine on TiO2 nanotube arrays
Sung Ha Ju, Sanghyun Han, Jeong Soo Kim
Journal of Industrial and Engineering Chemistry.2013; 19(1): 272. CrossRef
Characteristics of Porous Titanium Fabricated by Space-holder Method using NaCl
Byoung-Hwi Son, Jae-Geun Hong, Yong-Taek Hyun, Seung-Eon Kim, Seok-Choun Bae
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 488. CrossRef
Investigation About Surface Microstructure of Aluminum with Change of Voltage, a Period of Treatment and Density of Electrolyte in Micro-Arc Oxidation Treatment
In-Chul Yeo, In-Cheol Kang
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 575. CrossRef

Fabrication of Iron-Molybdenum Alloyed Nanoparticle and Nanowire using Chemical Vapor Condensation(CVC): Jong-Keun Ha, Kwon-Koo Cho, Ki-Won Kim, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2010;17(3):223-229.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.223

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Abstract PDF: Iron(Fe)-Molybdenum(Mo) alloyed nanoparticles and nanowires were produced by the chemical vapor condensation(CVC) process using the pyrolysis of iron pentacarbonyl(Fe(CO)_5) and Molybdenum hexacarbonyl(Mo(CO)_6). The influence of CVC parameter on the formation of nanoparticle, nanowire and size control was studied. The size of Fe-Mo alloyed nanoparticles can be controlled by quantity of gas flow. Also, Fe-Mo alloyed nanowires were produced by control of the work chamber pressure. Moreover, we investigated close correlation of size and morphology of Fe-Mo nanoparticles and nanowires with atomic quantity of inflow precursor into the electric furnace as the quantitative analysis. Obtained nanoparticles and nanowires were investigated by field emission scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction.

Thickness Control of Core Shell type Nano CoFe₂O₄@SiO₂ Structure: Ri Yu, Yoo-Jin Kim, Jae-Hwan Pee, Kyung-Ja Kim; J Korean Powder Metall Inst. 2010;17(3):230-234.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.230

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Abstract PDF: Homogenous silica-coated CoFe_2O_4 samples with controlled silica thickness were synthesized by the reverse microemulsion method. First, 7 nm size cobalt ferrite nanoparticles were prepared by thermal decomposition methods. Hydrophobic cobalt ferrites were coated with controlled SiO_2 using polyoxyethylene(5)nonylphenylether (Igepal) as a surfactant, NH_4OH and tetraethyl orthosilicate (TEOS). The well controlled thickness of the silica shell was found to depend on the reaction time and the amount of surfactant used during production. Thick shell was prepared by increasing reaction time and small amount of surfactant.

Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties: Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim; J Korean Powder Metall Inst. 2010;17(3):235-241.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.235

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Abstract PDF: Mo nanopowder was synthesized by ball-milling and subsequent hydrogen-reduction of MoO_3 powder. To fabricate ultra fine grained molybdenum, two-step sintering and spark plasma sintering process were employed. The grain size of specimen by two-step sintering and spark plasma sintering was around 0.6;µm and 0.4;µm, respectively. Mechanical properties of ultra fine grained Mo with relative density of above 90% were significantly improved at room and high temperatures comparing to commercial bulk Mo of 99% relative density. This result was mainly explained by the grain size refinement due to diffusion-controlled sintering.

Effect of Initial Silicon Scrap Size on Powder Refining Process During High Energy Ball Milling (HEBM): Joon-Woo Song, Hyo-Seob Kim, Sung-Shin Kim, Jar-Myung Koo, Soon-Jik Hong; J Korean Powder Metall Inst. 2010;17(3):242-250.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.242

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In this research, the optimal manufacturing conditions of fine Si powders from Si scrap were investigated as a function of different initial powder size using the high-energy ball milling equipment, which produces the fine powder by means of an ultra high-energy within a short duration. The morphological change of the powders according to the milling time was observed by Scanning electron microscopy (SEM). With the increasing milling time, the size of Si powder was decreased. In addition, more energy and stress for milling were required with the decreasing initial powder size. The refinement of Si scrap was rapidly carried out at 10min ball milling time. However, the refined powder started to agglomerate at 30 min milling time, while the powder size became uniform at 60 min milling time.

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Mechanical Properties and Biocompatibility of Ti-Nb-Zr-Mo-CPP Biomaterial Fabricated by Spark Plasma Sintering
기도 우, 상미 김, 동건 김, 대영 김, 동수 강
Korean Journal of Materials Research.2013; 23(2): 135~142. CrossRef
The Effect of Milling Conditions for Dissolution Efficiency of Valuable Metals from PDP Waste Panels
Hyo-Seob Kim, Chan-Mi Kim, Chul-Hee Lee, Sung-Kyu Lee, Hyun-Seon Hong, Jar-Myung Koo, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 107. CrossRef
Microstructure and Mechanical Properties of Nano-sized Ti-35%Nb-7%Zr-10%CPP Composite Fabricated by Pulse Current Activated Sintering
Kee-Do Woo, Duck-Soo Kang, Sang-Hyuk Kim, Sang-Hoon Park, Ji-Young Kim, Hye-Rim Ko
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 188. CrossRef
Effect of Milling Time on the Microstructure and Phase Transformation Behaviors of Ni-B Powder During Mechanical Alloying Process
Jung-Geun Kim, Wook-Jin Lee, Sung-Kyun Park, Ik-Min Park, Yong-Ho Park
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 496. CrossRef
Refinement Behavior of Coarse Magnesium Powder by High Energy Ball Milling (HEBM)
Joon-Woo Song, Hyo-Seob Kim, Hong-Moule Kim, Taek-Soo Kim, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 302. CrossRef

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