Journal of Powder Materials

Jar-Myung Koo

4 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 Powder Mater. 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

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

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

A Basic Study on the Fabrication of W-M(M=Cu, Sn, Ni) System High Density Composite (I): Tak-Soon Jang, Jun-Hee Hong, Tae-Haeng Lee, Jar-Myung Koo, Chang-Bin Song; J Korean Powder Metall Inst. 2009;16(4):268-274.; DOI: https://doi.org/10.4150/KPMI.2009.16.4.268

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For the purpose of obtaining basic information on the development of lead-free materials, a high density composites (a) W-Cu, (b) W-Sn (c)W-Cu-Sn and (d) W-Cu-Ni were fabricated by the P/M method. The particle size of used metal powders were under 325 mesh, inner size of compaction mould was phi8 mm, and compaction pressure was 400 MPa. A High density composite samples were sintered at a temperature between 140°C and 1050°C for 1 hour under Ar atmosphere. The microstructure, phase transformation and physical properties of the sintered samples were investigated. As the results, the highest relative density of 95.86% (10.87 g/cm3) was obtained particularly in the sintered W-Cu-Sn ternary system sample sintered at 450 for 1hr. And, Rockwell hardness (HRB) of 70.0 was obtained in this system.

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Fabrication and Performance Analysis of Environment Friendly Double Core Bullets for Small Arms
Jun-Hee Hong, Tak-Soon Jang, Chang-Bin Song, Dae-Wha Kang
Journal of the Korea Institute of Military Science and Technology.2011; 14(3): 345. CrossRef
Design and Performance Analysis of Environment Friendly Double Core Bullets for Small Arms
Jun-Hee Hong, Tak-Soon Jang, Chang-Bin Song, Byung-In Kim
Journal of the Korea Institute of Military Science and Technology.2011; 14(2): 264. CrossRef

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