- Investigation of Material Flow and Industrial Trend of Domestic Europium
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Han-Jin Ko, Jeong-Gon Kim, Il-Seuk Lee, Hong-Yoon Kang, Soon-Jik Hong
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J Korean Powder Metall Inst. 2013;20(5):382-387.
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DOI: https://doi.org/10.4150/KPMI.2013.20.5.382
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177
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Citations to this article as recorded by  - 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
- Influence of MAO Conditions on TiO2 Microstructure and Its Photocatalytic Activity
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Jeong-Gon Kim, In-Cheol Kang
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J Korean Powder Metall Inst. 2012;19(3):196-203.
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DOI: https://doi.org/10.4150/KPMI.2012.19.3.196
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228
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- TiO_2 was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in Na_3PO_4 electrolyte. This study deals with the influence of voltage and working time on the change of surface microstructure and phase composition. Voltage affected the forming rate of the oxidized layer and surface microstructure where, a low voltage led to a high surface roughness, more holes and a thin oxidized layer. On the other hand, a high voltage led to more dense surface structure, wider surface holes, a thick layer and fewer holes. Higher voltage increases photocatalytic activity because of better crystallization of the oxidized layer and good phase composition with anatase and rutile TiO_2, which is able to effectively separate excited electrons and holes at the surface.
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Citations
Citations to this article as recorded by - Study on thermal behavior of Ammonium Hexafluofide Titanate for Synthesis of TiO2 Powders
Duk-Hee Lee, Jae-Ryang Park, Chan-Gi Lee, Kyung-Soo Park, Hyeon-Mo Kim
Journal of Korean Powder Metallurgy Institute.2016; 23(5): 353. CrossRef - Control of Nano-Scaled Surface Microstructure of Al Sample for Improving Heat Release Ability
In-Chul Yeo, In-Cheol Kang
Journal of Korean Powder Metallurgy Institute.2015; 22(1): 21. CrossRef
- Investigation on Recycling in Material Flow on Indium Demand Industry
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Jeong-Gon Kim
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J Korean Powder Metall Inst. 2012;19(1):72-78.
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DOI: https://doi.org/10.4150/KPMI.2012.19.1.072
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219
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Citations to this article as recorded by - 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
- Investigation on Material Flow in Indium Demand Industry
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Jeong-Gon Kim
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J Korean Powder Metall Inst. 2011;18(4):313-321.
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DOI: https://doi.org/10.4150/KPMI.2011.18.4.313
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123
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Citations to this article as recorded by - 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
- Microstructure Control of Mg Alloy Powder Using a Repeated Extrusion Process
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Jeong-Gon Kim, Han-Shin Choi, Taek-Soo Kim
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J Korean Powder Metall Inst. 2009;16(6):438-441.
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DOI: https://doi.org/10.4150/KPMI.2009.16.6.438
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195
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- Mg-Cu composites were successively fabricated using a combination of rapid solidification and extrusion processes. In addition, the microstructural variation of the composite was investigated by performing the extrusion repeatedly. It resulted that the composite formed an uniform and dense structure by the extrusion, and the microstructure became fine as the extrusion conducted repeatedly. The microstructural variation was known to be dependent on the number of extrusion and the area reduction ratio. The tensile strength was also measured as a function of the microstructural variation.
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Citations to this article as recorded by - High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
M. Kawasaki, H.-J. Lee, M.C. Oh, B. Ahn
Archives of Metallurgy and Materials.2015; 60(2): 1327. CrossRef
- Production of Fe Amorphous Powders by Gas-Atomization Process and Subsequent Spark Plasma Sintering of Fe amorphous-ductile Cu Composite Powder Produced by Ball-milling Process (II) - II. SPS Behaviors of Composite Powders and their Characteristics -
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Jin-Chun Kim, Ji-Soon Kim, H.J. Kim, Jeong-Gon Kim
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J Korean Powder Metall Inst. 2009;16(5):326-335.
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DOI: https://doi.org/10.4150/KPMI.2009.16.5.326
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- Fe based (Fe_68.2C_5.9Si_3.5B_6.7P_9.6Cr_2.1Mo_2.0Al_2.0) amorphous powder, which is a composition of iron blast cast slag, were produced by a gas atomization process, and sequently mixed with ductile Cu powder by a mechanical ball milling process. The Fe-based amorphous powders and the Fe-Cu composite powders were compacted by a spark plasma sintering (SPS) process. Densification of the Fe amorphous-Cu composited powders by spark plasma sintering of was occurred through a plastic deformation of the each amorphous powder and Cu phase. The SPS samples milled by AGO-2 under 500 rpm had the best homogeneity of Cu phase and showed the smallest Cu pool size. Micro-Vickers hardness of the as-SPSed specimens was changed with the milling processes.
- Effects of Phase Fraction and Metallic Glass-Diamond Size Ratio on the Densification of Metallic Glass/Diamond Composite
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Su-Min Shin, Taek-Soo Kim, Seung-Koo Kang, Jeong-Gon Kim
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J Korean Powder Metall Inst. 2009;16(3):173-179.
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DOI: https://doi.org/10.4150/KPMI.2009.16.3.173
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- In the present study, Zr-base metallic glass(MG)/diamond composites are fabricated using a combination of gas-atomization and spark plasma sintering (SPS). The densification behaviors of mixtures of soft MG and hard diamond powders during consolidation process are investigated. The influence of mixture characteristics on the densification is discussed and several mechanism explaining the influence of diamond particles on consolidation behaviour are proposed. The experimental results show that consolidation is enhanced with increasing diamond/Metallic Glass(MG) size ratio, while the diamond fraction is fixed.
- Effect of Spark Plasma Sintering on the Materials Properties of Water Atomized Al-Zn-Mg Alloy
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Sun-Mi Kim, Taek-Soo Kim, Young-Do Kim, Jeong-Gon Kim
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J Korean Powder Metall Inst. 2009;16(1):63-67.
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DOI: https://doi.org/10.4150/KPMI.2009.16.1.063
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201
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- In order to investigate the effect of rapid solidification on the microstructure and the mechanical properties of Al-Zn-Mg system alloys, water atomization was carried out, since the water atomization beared the highest solidification rate among the atomization processes. The as atomized alloy powders consisted of fine grains less than 4 µm in diameter, and the second particles were not detected on XRD. The microstructure as solidified was maintained even after the spark plasma sintering at the heating rate of 50 K/min. On the other hand, lower rate of 20 K/min induced a formation of MgZn_2 particles, resulting in strengthening of the matrix. The density was almost constant at the temperature above 698K. The sintering temperature above 698K had no effect on the strength of the sintered materials.
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Citations to this article as recorded by - Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties
Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 235. CrossRef
- Application of PM to the Consolidation of Metallic Glassy Powder and its Composites
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Su-Min Shin, Taek-Soo Kim, Jin-Kyu Lee, Min-Seok Song, Jeong-Gon Kim
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J Korean Powder Metall Inst. 2007;14(6):348-353.
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DOI: https://doi.org/10.4150/KPMI.2007.14.6.348
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- In the present study, Zr-base metallic glass (MG) and Zr-base BMG/diamond composites were fabricated using a combination of gas atomization and spark plasma sintering (SPS). The microstructure, thermal stability and mechanical property of both the specimens as atomized and sintered were investigated. The experimental results showed that the SPSed specimens could be densified into nearly 100% and maintained the initial thermal stability at the sintering temperature of 630K. In addition, MG/diamond powder composites were successfully synthesised using SPS process. The composites, even a very low diamond volume fraction, generated a significant increase in compressive strength. With increasing the diamond volume fraction, the compressive strength was also increased due to the addition of hardest diamonds. It suggests that these composites would be potential candidates for a new cutting tool material.
- Process Optimization of Environment-Friendly Ag-SnO2 Electric Contact Materials through a Powder Metallurgy
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Jeong-Gon Kim
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J Korean Powder Metall Inst. 2007;14(5):327-332.
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DOI: https://doi.org/10.4150/KPMI.2007.14.5.327
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Abstract
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- In a view point of environment, the advanced electric contact material without environmental load element such as cadmium has to be developed. Extensive studies have been carried out on Ag-SnO_2 electric contact material as a substitute of Ag-CdO contact materials. In the present study, powder metallurgy including compaction and sintering is introduced to solve the incomplete oxidation problems in manufacturing process of Ag-SnO_2 electrical contact material. The Ag-SnO_2 contact material, fabricated in this study, was actually set in an electric switchgear of which working voltage is 462V and current is between 25 and 40A, for the purpose of testing its performance. As a result, it exceeded the existing Ag-CdO contact materials in terminal-temperature ascent and main contact resistance.
- Extrusion Behavior of Gas Atomized Mg Alloy Powders
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Hong-Jun Chae, Young-Do Kim, Jin-Kyu Lee, Jeong-Gon Kim, Taek-Soo Kim
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J Korean Powder Metall Inst. 2007;14(4):251-255.
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DOI: https://doi.org/10.4150/KPMI.2007.14.4.251
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179
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- This work is to report not only the effect of rapid solidification of MgZn_4.3Y_0.7 alloys on the micro-structure, but also the extrusion behavior on the materials properties. The average grain size of the atomized powders was about 3-4µm. The alloy powders of Mg_97Zn_4.3Y_0.7, consisted of I-Phase (Icosahedral, Mg_3Zn_6Y_1) as well as Cubic structured W-Phase (Mg_3Zn_3Y_2), which was finely distributed within alpha-Mg matrix. The oxide layer formed along the Mg surface was about 48 nm in thickness. In order to study the consolidation behavior of Mg alloy powders, extrusion was carried out with the area reduction ratio of 10:1 to 20:1. As the ratio increased, fully deformed and homogeneous microstructure could be obtained, and the mechanical properties such as tensile strength and elongation were simultaneously increased.
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Citations
Citations to this article as recorded by - Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders
Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 340. CrossRef
- Fabrication of Bulk Metallic Glass Composites by Mechanical Milling with Subsequent Spark Plasma Sintering Process
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Jin-Kyu Lee, Taek-Soo Kim, Jeong-Gon Kim
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J Korean Powder Metall Inst. 2007;14(3):197-201.
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DOI: https://doi.org/10.4150/KPMI.2007.14.3.197
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195
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- Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.
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Citations to this article as recorded by - Powder Sintering Characteristics of Carbon Nanotubes Reinforced SKD11 Tool Steel Sintered by Spark Plasma Sintering
Je-Se Moon, Sung-Sil Jung, Dae-Yeol Lee, Young-Keun Jeong, Myung Chang Kang, Chun-Dal Park, Kook-Tae Youn
Journal of Korean Powder Metallurgy Institute.2015; 22(3): 157. CrossRef
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