Journal of Powder Materials

Hyo-Seob Kim

8 Articles

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; J Korean Powder Metall Inst. 2013;20(2):107-113.; DOI: https://doi.org/10.4150/KPMI.2013.20.2.107

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In this study, the microstructure and valuable metals dissolution properties of PDP waste panel powders were investigated as a function of milling parameters such as ball diameter size, milling time, and rotational speed during high-energy milling process. The complete refinement of powder could achieved at the ball diameter size of 5 mm due to sufficient impact energy and the number of collisions. With increasing milling time, the average particle size was rapidly decreased until the first 30 seconds, then decreased gradually about 3µm at 3 minutes and finally, increased with presence of agglomerated particles of 35µm at 5 minutes. Although there was no significant difference on the size of the particle according to the rotational speed from 900 to 1,100 rpm, the total valuable metals dissolution amount was most excellent at 1,100 rpm. As a result, the best milling conditions for maximum dissolving amount of valuable metals (Mg: 375 ppm, Ag 135 ppm, In: 17 ppm) in this research were achieved with 5 mm of ball diameter size, 3min of milling time, and 1,100 rpm of rotational speed.

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Comparison Of Mercury Distribution Between The Types Of Spent Fluorescent Lamp
S.W. Rhee, H.-S. Park, H.H. Choi
Archives of Metallurgy and Materials.2015; 60(2): 1297. CrossRef

Fabrication of Ceramic Dental Block by Magnetic Pulsed Compaction: Hyo-Young Park, Hyo-Seob Kim, Soon-Jik Hong; J Korean Powder Metall Inst. 2012;19(5):373-378.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.373

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Abstract PDF: Sintered bulks of ZrO_2 nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent two-step sintering employed in this study and the formability effects of nanopowder on mixing condition, pressure and sintering temperature were investigated. The addition of PVA induced and increase in the formability of the sintered bulk. But cracked bulks were obtained on sintering with addition of over 10 wt% PVA due to generation of crack during sintering. The optimum compaction pressure during MPC was 1.0 GPa and mixing conditions included using 5.0 wt% PVA. The optimum processing condition included MPC process, followed by two-step sintering (first at 1000 and then at 1450°C). The sintered bulks with the diameter of 30 mm under these conditions were found to have non crack, ~99% density.

Recycling Technology and Status of Tellurium Materials: Hyo-Seob Kim, Soon-Jik Hong; J Korean Powder Metall Inst. 2012;19(3):232-238.; DOI: https://doi.org/10.4150/KPMI.2012.19.3.232

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Synthesis and Characterization of (AgSbTe₂)₁₅(GeTe)₈₅ Thermoelectric Powder by Gas Atomization Process: Hyo-Seob Kim, Jin-Kyu Lee, Jar-Myung Koo, Byong-Sun Chun, Soon-Jik Hong; J Korean Powder Metall Inst. 2011;18(5):449-455.; DOI: https://doi.org/10.4150/KPMI.2011.18.5.449

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In this study, p-type (AgSbTe_2)_15(GeTe)_85: TAGS-85 compound powders were prepared by gas atomization process, and then their microstructures and mechanical properties were investigated. The fabricated powders were of spherical shape, had clean surface, and illustrated fine microstructure and homogeneous AgSbTe_2 + GeTe solid solution. Powder X-ray diffraction results revealed that the crystal structure of the TAGS-85 sample was single rhombohedral GeTe phase, which with a space group R_3m. The grain size of the powder particles increased while the micro Vickers hardness decreased with increasing annealing temperature within the range of 573 K and 723 K due to grain growth and loss of Te. In addition, the crystal structure of the powder went through a phase transformation from rhombohedral (R_3m) at low-temperature to cubic (F_m-3m) at high-temperature with increasing annealing temperature. The micro Vickers hardness of the as-atomized powder was around 165 Hv, while it decreased gradually to 130 Hv after annealing at 673K, which is still higher than most other fabrication processes.

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Thermoelectric properties of n-type Bi2Te3 alloys produced by a combined process of magnetic pulsed compaction (MPC) and spark plasma sintering (SPS)
Chul-Hee Lee, M. Fatih Kilicaslan, Babu Madavali, Soon-Jik Hong
Research on Chemical Intermediates.2014; 40(7): 2543. CrossRef

Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time: Hyo-Seob Kim, Jun-Je Sung, Cheol-Hee Lee, Hyun-Seon Hong, Soon-Jik Hong; J Korean Powder Metall Inst. 2011;18(4):378-384.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.378

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In this research, the indium dissolution properties of the waste LCD panel powders were investigated as a function of milling time fabricated by high-energy ball milling (HEBM) process. The particle morphology of waste LCD panel powders changed from sharp and irregular shape of initial cullet to spherical shape with an increase in milling time. The particle size quickly decreased to 15 µm until the first minute, then decreased gradually about 6 µm with presence of agglomerated particles after 5 minutes, which increased gradually reaching a uniform size of 13 µm consist of agglomerated particles after 30 minutes. The glass recovery, after dissolution, was over 99% at initial cullet, which decreased to 90.1 and 78.6% with increasing milling time of 1 and 30 minute respectively, due to a loss in remaining powder of the surface ball and jar, as well as the filter paper. The dissolution amount of indium out of the initial cullet was 208 ppm before milling, turning into 223 ppm for the mechanically milled powder after 1 minute, and nearly 146~125 ppm with further increase in milling time because of the reaction surface decrease of powders due to agglomeration. With this process, maximum dissolving indium amount (223 ppm) could be achieved at a particle size of 15 µm with 1 minute of milling.

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Indium ion cementation onto aluminum plates in hydrochloric acid solutions: a kinetic perspective
Hyun Seon Hong, Geon Hong Kim, Myung Hwan Hong, Sungkyu Lee, Jae-Chun Lee
International Journal of Materials Research.2014; 105(2): 177. 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

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; J Korean Powder Metall Inst. 2010;17(4):302-311.; DOI: https://doi.org/10.4150/KPMI.2010.17.4.302

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In this research, the refinement behavior of the coarse magnesium powders fabricated by gas atomization was investigated as a function of milling time using a short duration high-energy ball milling equipment, which produces fine powders by means of an ultra high-energy within a short duration. The microstructure, hardness, and formability of the powders were investigated as a function of milling time using X-ray diffraction, scanning electron microscopy, Vickers micro-hardness tester and magnetic pulsed compaction. The particle morphology of Mg powders changed from spherical particles of feed metals to irregular oval particles, then platetype particles, with increasing milling time. Due to having HCP structure, deformation occurs due to the existence of the easily breakable C-axis perpendicular to the base, resulting in producing plate-type powders. With increasing milling time, the particle size increased until 5 minutes, then decreased gradually reaching a uniform size of about 50 micrometer after 20 minutes. The relative density of the initial power was 98% before milling, and mechanically milled powder was 92~94% with increase milling time (1~5 min) then it increased to 99% after milling for 20 minutes because of the change in particle shapes.

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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
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 32. 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
Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time
Hyo-Seob Kim, Jun-Je Sung, Cheol-Hee Lee, Hyun-Seon Hong, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 378. 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 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

The Effect of Ti Powder addition on Compaction Behavior of TiO₂ Nano Powder: Jin-Sub Park, Hyo-Seob Kim, Ki-Seok Lee, Jeong-Goo Lee, Chang-Kyu Rhee, Soon-Jik Hong; J Korean Powder Metall Inst. 2009;16(3):223-230.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.223

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The compaction response of TiO_2 nano powders with an addition of Ti powders prepared by magnetic pulsed compaction and subsequent sintering processes was investigated. All kinds of different bulk exhibited an average shrinkage of about 12% for different MPCed pressure and sintering temperature, which were approximately 50% lower than those fabricated by general process (20%) and a maximum density of around 92.7% was obtained for 0.8GPa MPCed pressure and 1400°C sintering temperature. The addition of Ti powder induced an increase in the formability and hardness of the sintered TiO_2. But the lower densities were obtained on sintering with addition of over 10 (wt%) Ti powder due to generation of crack during sintering. Subsequently it was verified that the optimum compaction pressure in MPC and sintering temperature were 0.8GPa and 1400°C, respectively.

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Fabrication of Ceramic Dental Block by Magnetic Pulsed Compaction
Hyo-Young Park, Hyo-Seob Kim, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 373. CrossRef

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