Journal of Powder Materials

Investigation on Material Flow in Indium Demand Industry: Jeong-Gon Kim; J Korean Powder Metall Inst. 2011;18(4):313-321.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.313

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Material Flow Analysis for Stable Supply and Demand Management of Tin
Sang Hyun Oh, Hong-Yoon Kang, Yong Woo Hwang, Doo Hwan Kim, Kayoung Shin, Nam Seok Kim
Resources Recycling.2023; 32(4): 18. 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
Investigation on Recycling in Material Flow on Indium Demand Industry
Jeong-Gon Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 72. CrossRef

Inkjet Printing Using Cu Nano Powder Ink Coated with 1-Octanethiol in Dry Method: Jae-Hak Her, Shin-Young Park, Mominul Md. Haque, Caroline Sun-Yong Lee; J Korean Powder Metall Inst. 2011;18(4):322-326.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.322

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Abstract PDF: Inkjet printing was successfully done using Cu nano powder ink after these Cu nano powders were dry-coated with 1-octanethiol for oxidation prevention. 1-octanethiol, which is Self-Assembled Multi-layers (SAMs), was coated approximately 10-nm thick on the surface of Cu nano powders. 1-Octanol, which has the same chain length as that for 1-octanethiol, was used as a solvent to make the ink for inkjet printing. As a result, the fabricated ink was dispersed for about 4 weeks, and after printing and heat treatment at 350°C for 4 hours, the resistivity for the printed pattern was measured to be 1.15times10-5Omegacdotcm.

Fabrication of Porous Cu by Freeze-Drying Method of CuO-Camphene Slurry: Min-Soo Kim, Sung-Tag Oh, Si-Young Chang, Myung-Jin Suk; J Korean Powder Metall Inst. 2011;18(4):327-331.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.327

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In order to fabricate the porous metal with controlled pore characteristics, unique processing by using metal oxide powder as the source and camphene as the sublimable material is introduced. CuO powder was selected as the source for the formation of Cu metal via hydrogen reduction. Camphene-based CuO slurry, prepared by milling at 47°C with a small amount of dispersant, was frozen at -25°C. Pores were generated subsequently by sublimation of the camphene. The green body was hydrogen-reduced at 200°C for 30 min, and sintered at 500-700°C for 1 h. Microstructural analysis revealed that the sintered Cu showed aligned large pore channels parallel to the camphene growth direction, and fine pores are formed around the large pore. Also, it showed that the pore size was controllable by the slurry concentration.

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Freeze drying for porous Mo with different sublimable vehicle compositions in the camphor-naphthalene system
Sung-Tag Oh, Young Do Kim, Myung-Jin Suk
Materials Letters.2015; 139: 268. CrossRef
Effect of Solidification Condition of Sublimable Vehicles on the Pore Characteristics in Freeze Drying Process
Myung-Jin Suk, Ji Soon Kim, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2014; 21(5): 366. CrossRef
Synthesis and Microstructure of Porous Al2O3 with Nano-Sized Cu Dispersions
호석 유, 창용 현, 안기 김
Korean Journal of Materials Research.2013; 23(1): 67~71. CrossRef
Effect of Powder Characteristic and Freeze Condition on the Pore Characteristics of Porous W
Na-Yeon Kwon, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2012; 19(4): 259. CrossRef
Fabrication of Porous Mo by Freeze-Drying and Hydrogen Reduction of MoO3/Camphene Slurry
Wonsuk Lee, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 446. CrossRef
Fabrication and Properties of Porous Tungsten by Freeze-Drying Process
영숙 이, 승탁 오
Korean Journal of Materials Research.2011; 21(9): 520~524. CrossRef

Synthesis of Nano-sized Tungsten Carbide - Cobalt Powder by Liquid Phase Method of Tungstate: Jong-Hoon Kim, Yong-Ho Park, Gook-Hyun Ha; J Korean Powder Metall Inst. 2011;18(4):332-339.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.332

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Cemented tungsten carbide has been used in cutting tools and die materials, and is an important industrial material. When the particle size is reduced to ultrafine, the hardness and other mechanical properties are improved remarkably. Ultrafine cemented carbide with high toughness and hardness is now widely used. The objective of this study is synthesis of nanostructured WC-Co powders by liquid phase method of tungstate. The precursor powders were obtained by freezen-drying of aqueous solution of soluble salts, such as ammonium metatungstate, cobalt nitrate. the final compositions were WC-10Co. In the case of liquid phase method, it can be observed synthesis of WC-10Co. The properties of powder produced at various temperature, were estimated from the SEM, BET and C/S analyser.

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Development of a new nanocrystalline alloy for X-ray shielding
J. H. Cho, H. K. Lee, M. S. Kim, J. D. Rhim, Y. J. Park
Radiation Effects and Defects in Solids.2018; 173(7-8): 643. CrossRef
Study on dispersibility of thermally stable carbon black particles in ink using asymmetric flow field-flow fractionation (AsFlFFF)
Woonjung Kim, Jihyun Bae, Chul Hun Eum, Jongjin Jung, Seungho Lee
Microchemical Journal.2018; 142: 167. CrossRef
Surface Modification of Carbon Black Using Polymer Resin Synthesized by a Phenyl Radical Reaction
Seungho Lee, Chul Hun Eum, Woon Jung Kim
Journal of the Korean Chemical Society.2016; 60(4): 286. CrossRef
Improvement in Mechanical and Wear Properties of WC-Co by Ultrasonic Nanocrystal Surface Modification Technique
Seung-Chul Lee, Jun-Hyong Kim, Gab-Su Choi, Young-Do Jang, Auezhan Amanov, Young-Sik Pyun
Journal of the Korean Society of Tribologists and Lubrication Engineers.2015; 31(2): 56. CrossRef
Changes in Mechanical Properties of WC-Co by Ultrasonic Nanocrystal Surface Modification Technique
Seung-Chul Lee, Jun-Hyong Kim, Hak-Doo Kim, Gab-Su Choi, Auezhan Amanov, Young-Sik Pyun
Journal of the Korean Society of Tribologists and Lubrication Engineers.2015; 31(4): 157. CrossRef

Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders: Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim; J Korean Powder Metall Inst. 2011;18(4):340-346.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.340

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Abstract PDF: In order to improve the weak mechanical properties of cast Mg alloys, Mg-Zn_1Y_2 (at%) alloy powders were synthesized using gas atomization, a typical rapid solidification process. The powders consist of fine dendrite structures less than 3 µm in arm spacing. In order to fabricate a bulk form, the Mg powders were compacted using magnetic pulse compaction (MPC) under various processing parameters of pressure and temperature. The effects of the processing parameters on the microstructure and mechanical properties were systematically investigated.

Fabrication of Ordered or Disordered Macroporous Structures with Various Ceramic Materials from Metal Oxide Nanoparticles or Precursors: Young-Sang Cho, Jun-Hyuk Moon, Young-Kuk Kim, Chul-Jin Choi; J Korean Powder Metall Inst. 2011;18(4):347-358.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.347

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Two different schemes were adopted to fabricate ordered macroporous structures with face centered cubic lattice of air spheres. Monodisperse polymeric latex suspension, which was synthesized by emulsifier-free emulsion polymerization, was mixed with metal oxide ceramic nanoparticles, followed by evaporation-induced self-assembly of the mixed hetero-colloidal particles. After calcination, inverse opal was generated during burning out the organic nanospheres. Inverse opals made of silica or iron oxide were fabricated according to this procedure. Other approach, which utilizes ceramic precursors instead of nanoparticles was adopted successfully to prepare ordered macroporous structure of titania with skeleton structures as well as lithium niobate inverted structures. Similarly, two different schemes were utilized to obtain disordered macroporous structures with random arrays of macropores. Disordered macroporous structure made of indium tin oxide (ITO) was obtained by fabricating colloidal glass of polystyrene microspheres with low monodispersity and subsequent infiltration of the ITO nanoparticles followed by heat treatment at high temperature for burning out the organic microspheres. Similar random structure of titania was also fabricated by mixing polystyrene building block particles with titania nanoparticles having large particle size followed by the calcinations of the samples.

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Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Y.-S. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1221. CrossRef

Synthesis of Zr-Ti Alloy Powder by Magnesium Reduction: Dong-Won Lee, Geun-Tae Park, Tae-Soo Lim, Hye-Moon Lee, Ji-Hun Yu; J Korean Powder Metall Inst. 2011;18(4):359-364.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.359

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Zr-Ti alloy powders were successfully synthesized by magnesium thermal reduction of metal chlorides. The evaporated and mixed gasses of ZrCl_4+TiCl_4 were injected to liquid magnesium and the chloride components were reduced by magnesium leading to the formation of MgCl_2. The released Zr and Ti atoms were then condensed to particle forms inside the mixture of liquid magnesium and magnesium chloride, which could be dissolved fully in post process by 1~5% HCl solution at room temperature. By the fraction-control of individually injected ZrCl_4 and TiCl_4 gasses, the final compositions of produced alloy powders were changed in the ranges of Zr-0 wt.%~20 wt.%Ti and their purity and particle size were about 99.4% and the level of several micrometers, respectively.

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Synthesis of Vanadium Powder by Magnesiothermic Reduction
Dong Won Lee, Hak Sung Lee, Jung Yeul Yun, Young Ho Kim, Jei Pil Wang
Advanced Materials Research.2014; 1025-1026: 509. CrossRef
Extraction of Vanadium Powder by Metallothermic Reduction
Dong-Won Lee, Sang-Hyun Heo, Jong-Taek Yeom, Jei-Pil Wang
Journal of Korean Powder Metallurgy Institute.2013; 20(1): 43. CrossRef

Fabrication of Gradient Porous Al-Cu Sintered Body: Jong-Min Byun, Se-Hoon Kim, Jin-Woo Kim, Young-Moon Kim, Young-Do Kim; J Korean Powder Metall Inst. 2011;18(4):365-371.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.365

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Abstract PDF: In this study, gradient porous Al-Cu sintered body was fabricated by powder metallurgy processing. Al-Cu powder mixtures were prepared by low energy ball milling with various milling time. After ball milling for 3h, the shape of powder mixtures changed to spherical type with size of 100~500 µm. Subsequently, Al-Cu powder mixtures were classified (under 150, 150~300 and over 300 µm) and compacted (20, 50 and 100 MPa). Then, they were sintered at 600°C for various holding time (10, 30, 60 and 120 min) in N_2 atmosphere. The sintered bodies had 32~45% of porosity. As a result, the optimum holding time was determined to be 60 min at 600°C and sintered bodies with various porosity were obtained by controlling the compacting pressure.

Microstructure and Characteristics of Ag-SnO₂ Contact Materials Prepared by Magnetic Pulsed Compaction: J.S. Park, Y.J. Kim, M.H. Lee, H.S. Lee, S.J. Hong, J.K. Lee; J Korean Powder Metall Inst. 2011;18(4):372-377.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.372

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Abstract PDF: In this study, we reported the microstructure and properties of Ag-SnO_2 contact materials fabricated by a controlled milling process with subsequent consolidation. The milled powders were consolidated to bulk samples using a magnetic pulsed compaction process. The nano-scale SnO_2 phases were distributed homogeneously in the Ag matrix after the consolidation. The relative density and hardness of the Ag-SnO_2 contact materials were 95~96% and 89~131 Hv, respectively.

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

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