Journal of Powder Materials

Jung-Yeul Yun

12 Articles

The Effect of Binder Content for the Pore Properties of Fe Foam Fabricated by Slurry Coating Process: Jin Ho Choi, Sangsun Yang, Yang-Do Kim, Jung-Yeul Yun; J Powder Mater. 2013;20(6):439-444.; DOI: https://doi.org/10.4150/KPMI.2013.20.6.439

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Fe foam with above 90% porosity and 2 millimeter pore size was successfully fabricated by a slurry coating process. In this study, the binder contents were controlled to produce the Fe foam with different pore size, strut thickness and porosity. Firstly, the slurry was prepared by uniform mixing with Fe powders, distilled water and polyvinyl alcohol(PVA) as initial materials. After slurry coating on the polyurethane(PU) foam the sample was dried at 80°C. The PVA and PU foams were then removed by heating at 700°C for 3 hours. The debinded samples were subsequently sintered at 1250°C with holding time of 3 hours under hydrogen atmosphere. The three dimensional geometries of the obtained Fe foams with open cell structure were investigated using X-ray micro CT(computed tomography) as well as the pore morphology, size and phase.

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Interfacial Bonding and Abrasive Wear Behavior of Iron Matrix Composite Reinforced by Ceramic Particles
Yefei Li, Cong Li, Shuli Tang, Qiaoling Zheng, Juan Wang, Zhibo Zhang, Zhicheng Wang
Materials.2019; 12(22): 3646. CrossRef
A Fatigue Fracture Study on TDCB Aluminum Foam Specimen of Type Mode III Bonded with Adhesive
J.H. Lee, J.U. Cho
Archives of Metallurgy and Materials.2017; 62(2): 1359. CrossRef
Torsion Property of the Structure Bonded Aluminum Foam Due to Impact
G.W. Hwang, J.U. Cho
Archives of Metallurgy and Materials.2017; 62(2): 1353. CrossRef
Experimental Study On Fracture Property Of Double Cantilever Beam Specimen With Aluminum Foam
Y.C. Kim, H.K. Choi, J.U. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1151. CrossRef
Experimental Study On Fracture Property Of Tapered Double Cantilever Beam Specimen With Aluminum Foam
Y.C. Kim, S.S. Kim, J.U. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1459. CrossRef
The Effect of Fe and Fe2O3Powder Mixing Ratios on the Pore Properties of Fe Foam Fabricated by a Slurry Coating Process
Jin Ho Choi, Eun-Mi Jeong, Dahee Park, Sangsun Yang, Yoo-Dong Hahn, Jung-Yeul Yun
Journal of Korean Powder Metallurgy Institute.2014; 21(4): 266. CrossRef

Preparation of Metal Injection Molded Dental Components using Spheroidized Ti Powders by Plasma Process: Ji-Na Gwak, Sangsun Yang, Jung-Yeul Yun, Ju-Yong Kim, Seongjin Park, Hyun-Seung Kim, Yong-Jin Kim, Yong-Ho Park; J Powder Mater. 2013;20(6):467-473.; DOI: https://doi.org/10.4150/KPMI.2013.20.6.467

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This research presents a preparation method of dental components by metal injection molding process (MIM process) using titanium scrap. About 20µm sized spherical titanium powders for MIM process were successfully prepared by a novel dehydrogenation and spheroidization method using in-situ radio frequency thermal plasma treatment. The effects of MIM process parameters on the mechanical and biological properties of dental components were investigated and the optimum condition was obtained. After sintering at 1250°C for 1 hour in vacuum, the hardness and the tensile strength of MIMed titanium components were 289 Hv and 584 MPa, respectively. Prepared titanium dental components were not cytotoxic and they showed a good cell proliferation property.

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Effect of Heat Treatment Temperature and Atmosphere on the Microstructure of TiH2-WO3 Powder Mixtures
Han-Eol Lee, Yeon Su Kim, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2017; 24(1): 41. CrossRef
Characterization Of The Graded Microstructure In Powder Sintered Porous Titanium
J.-J. Oak, J.I. Bang, K.-C. Bae, Y.H. Kim, Y.-C. Lee, H.H. Chun, Y.H. Park
Archives of Metallurgy and Materials.2015; 60(2): 1265. CrossRef

Study on the Reduction of Forging Oxide Scale using Hydrogen: Dong-Won Lee, Jung-Yeul Yun, Shun-Myung Shin, In-Soo Kim, Jei-Pil Wang; J Powder Mater. 2013;20(3):174-179.; DOI: https://doi.org/10.4150/KPMI.2013.20.3.174

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The study on the fabrication of iron powder from forging scales using hydrogen gas has been conducted on the effect of hydrogen partial pressure, temperature, and reactive time. The mechanism for the reduction of iron oxides was proposed with various steps, and it was found that reduction pattern might be different depending on temperature. The iron content in the scale and reduction ratio of oxygen were both increased with increasing reactive time at 0.1atm of hydrogen partial pressure. On the other hand, for over 30 minutes at 0.5 atm of hydrogen partial pressure, the values were found to be almost same. In the long run, iron metallic powder was obtained with over 90% of iron content and an average size of its powder was observed to be about 100µm.

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Effects of expanded graphite content on the performance of MgO‐C refractories
Junseong Kim, Seunghwa Jeong, Minsuk Lee, Dong Jae Kang, Hong‐woo Park, Hwa‐In Lee, Dong‐Yeol Yang, Eun Hee Kim, Soonil Lee, Seung‐Cheol Yang, Sang‐Chae Jeon
International Journal of Applied Ceramic Technology.2023; 20(6): 3803. CrossRef
Smithing Processes Based on Hammer Scale Excavated from the Third- to Fourth-Century Ancient Iron-Making Sites of the Korean Peninsula
Dayeon Jung, Heehong Kwon, Namchul Cho
Materials.2022; 15(12): 4188. CrossRef

Trend in Research and Development of Recovery of Valuable Metallic Powder from Wasted Batteries: Shun-Myung Shin, Sung-Ho Joo, Dong-Won Lee, Jung-Yeul Yun, Jei-Pil Wang; J Powder Mater. 2013;20(1):60-67.; DOI: https://doi.org/10.4150/KPMI.2013.20.1.060

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A study on Zn recovery from other metals in the spent mixed batteries through a sequence of hydrometallurgical processes
Dong Ju Shin, Sung-Ho Joo, Chang-Hyun Oh, Jei-Pil Wang, Jin-Tae Park, Dong Joon Min, Shun Myung Shin
Environmental Technology.2019; 40(26): 3512. CrossRef
Development of Batch-Type Electric Furnace for Recovery of Valuable Materials from Spent Batteries
Shun Myung Shin, Dong Won Lee, Jung Yeul Yun, Byung Ho Jung, Jei Pil Wang
Applied Mechanics and Materials.2014; 607: 197. CrossRef

Synthesis and Catalytic Characteristics of Thermally Stable TiO₂/Pt/SiO₂ Hybrid Nanocatalysts: A. Satyanarayana Reddy, Chan-Ho Jung, Sun-Mi Kim, Jung-Yeul Yun, Jeong-Young Park; J Korean Powder Metall Inst. 2011;18(6):532-537.; DOI: https://doi.org/10.4150/KPMI.2011.18.6.532

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Abstract PDF: Thermally stable TiO_2/Pt/SiO_2 core-shell nanocatalyst has been synthesized by chemical processes. Citrated capped Pt nanoparticles were deposited on amine functionalized silica produced by Stober process. Ultrathin layer of titania was coated on Pt/SiO_2 for preventing sintering of the metal nanoparticles at high temperatures. Thermal stability of the metal-oxide hybrid catalyst was demonstrated heating the sample up to 600°C in air and by investigating the morphology and integrity of the structure by transmission electron spectroscopy. The surface analysis of the constituent elements was performed by X-ray photoemission spectroscopy. The catalytic activity of the hybrid catalysts was investigated by CO oxidation reaction with oxygen as a model reaction.

Fabrication of Fecralloy Foil Coated by Fecralloy Nanoparticles Using Electrospray Processing: Jung-Yeul Yun, Sang-Sun Yang, Hye-Young Koo, Hye-Moon Lee; J Korean Powder Metall Inst. 2011;18(6):526-531.; DOI: https://doi.org/10.4150/KPMI.2011.18.6.526

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Fecralloy is the promising materials for high temperature exhaust filtering system due to the excellent its oxidation resistance property. In this research, Fecralloy nanoparticles coated Fecralloy thin foil was prepared by a single nozzle electrospray system in order to increase surface area of Fecralloy foil. Fecralloy nanoparticles were fabricated by electrical wire explosion method in ethanol using Fecralloy wires as a source material. Electrospray modes with applied D.C voltages to Fecralloy colloidal solution were investigated to make a stable cone-jet mode. Coated layers with and without additional heat treatment were observed by FE-SEM (field emission-scanning electron microscope) and tape test for evaluating their adhesion to substrate were performed as well.

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Performance and techno-economic evaluation of a high-efficiency electrospray cyclone
Jun Su Park, Dae-Gyun Lee, Kang-San Lee, Jin-Han Kim, Jung Hoon Yoo, Hang Joo Shin, Young-Chan Choi, Young-joo Lee, YoungMin Woo, Meehye Lee, Jong Won Choi
Journal of Environmental Chemical Engineering.2024; 12(3): 112908. CrossRef
Electrospray and Thermal Treatment Process for Enhancing Surface Roughness of Fecralloy Coating Layer on a Large Sized Substrate
Hye Moon Lee, Hye Young Koo, Sangsun Yang, Dahee Park, Sooho Jung, Jung-Yeul Yun
Journal of Korean Powder Metallurgy Institute.2017; 24(1): 46. CrossRef
Alloyability of warm formed FeCrAl powder compacts
M.M. Rahman, A.A.A. Talib
Materials Today Communications.2015; 4: 42. CrossRef
Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2014; 21(1): 55. CrossRef
Effect of Sintering Temperature on the High Temperature Oxidation of Fe-Cr-Al Powder Porous Metal Manufactured by Electrospray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 435. CrossRef

High Temperature Oxidation Behavior of Ni based Porous Metal: Sung-Hwan Choi, Jung-Yeul Yun, Hye-Mun Lee, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee; J Korean Powder Metall Inst. 2011;18(2):122-128.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.122

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This study investigated the high temperature oxidation behavior of Ni-22.4%Fe-22%Cr-6%Al (wt.%) porous metal. Two types of open porous metals with different pore sizes of 30 PPI and 40 PPI (pore per inch) were used. A 24-hour TGA test was conducted at three different temperatures of 900°C, 1000°C and 1100°C. The results of the BET analysis revealed that the specific surface area increased as the pore size decreased from 30 PPI to 40 PPI. The oxidation resistance of porous metal decreased with decreasing pore size. As the temperature increased, the oxidation weight gain of the porous metal also increased. Porous metals mainly created oxides such as Al_2O_3, Cr_2O_3, NiAl_2O_4, and NiCr_2O_4. In the 40 PPI porous metal with small pore size and larger specific surface area, the depletion of stabilizing elements such as Al and Cr occurred more quickly during oxidation compared to the 30 PPI porous metal. Ni-Fe-Cr-Al porous metal's high-temperature oxidation micro-mechanism was also discussed.

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Effect of Strut Thickness on Room and High Temperature Compressive Properties of Block-Type Ni-Cr-Al Powder Porous Metals
B.-H. Kang, M.-H. Park, K.-A. Lee
Archives of Metallurgy and Materials.2017; 62(2): 1329. CrossRef
Fabrication of metallic alloy powder (Ni3Fe) from Fe–77Ni scrap
Inseok Seo, Shun-Myung Shin, Sang-An Ha, Jei-Pil Wang
Journal of Alloys and Compounds.2016; 670: 356. CrossRef
Preparation of oxide powder by continuous oxidation process from recycled Fe-77Ni alloy scrap
J Y Yun, D H Park, G J Jung, J P Wang
IOP Conference Series: Materials Science and Engineering.2015; 103: 012026. CrossRef
Reduction of High Nickel-Based Oxide Particles Using Hydrogen Gas
Sung Ho Joo, Shun Myung Shin, Dong Ju Shin, Jei Pil Wang
Applied Mechanics and Materials.2015; 778: 148. CrossRef
Fabrication of oxide powder from Fe–46Ni alloy scrap
J.-Y. Yun, D.-W. Lee, S.-M. Shin, J.-P. Wang
Materials Research Innovations.2015; 19(sup5): S5-415. CrossRef
Evaluation of Creep Reliability of Powder Metallurgy and Cast-type Ni-based Superalloy by Using Ultrasonic Wave
Chan-Yang Choi, Jin-Hun Song, Se-Ung Oh, Chung-Seok Kim, Sook-In Kwun, Sung-Tag Oh, Chang-Yong Hyun, Jai-Won Byeon
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 215. CrossRef
Effect of Sintering Temperature on the High Temperature Oxidation of Fe-Cr-Al Powder Porous Metal Manufactured by Electrospray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 435. CrossRef

Fabrication of Ni-free Fe-based Alloy Nano Powder by Pulsed Wire Evaporation in Liquid: Part 2. Effect of Solvent and Comparison of Fabricated Powder owing to Fabrication Method: Ho-Jin Ryu, Yong-Heui Lee, Kwang-Ug Son, Young-Min Kong, Jin-Chun Kim, Byoung-Kee Kim, Jung-Yeul Yun; J Korean Powder Metall Inst. 2011;18(2):112-121.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.112

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This study investigated the effect of solvent on the fabrication of Ni-free Fe-based alloy nano powders by employing the PWE (pulsed wire evaporation) in liquid and compared the alloy particles fabricated by three different methods (PWE in liquid, PWE in Ar, plasma arc discharge), for high temperature oxidation-resistant metallic porous body for high temperature soot filter system. Three different solvents (ethanol, acetone, distilled water) of liquid were adapted in PWE in liquid process, while X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), and transmission electron microscope (TEM) were used to investigate the characteristics of the Fe-Cr-Al nano powders. The alloy powder synthesized by PWE in ethanol has good particle size and no surface oxidation compared to that of distilled water. Since the Fe-based alloy powders, which were fabricated by PWE in Ar and PAD process, showed surface oxidation by TEM analysis, the PWE in ethanol is the best way to fabricate Fe-based alloy nano powder.

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Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2014; 21(1): 55. CrossRef

Fabrication of Ni-free Fe-based Alloy Nano Powder by Pulsed Wire Evaporation in Liquid: Part I. Effect of Wire Diameter and Applied Voltage: Ho-Jin Ryu, Yong-Heui Lee, Kwang-Ug Son, Young-Min Kong, Jin-Chun Kim, Byoung-Kee Kim, Jung-Yeul Yun; J Korean Powder Metall Inst. 2011;18(2):105-111.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.105

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This study investigated the effect of wire diameter and applied voltage on the fabrication of Ni-free Fe-based alloy nano powders by employing the PWE (pulsed wire evaporation) in liquid, for high temperature oxidation-resistant metallic porous body for high temperature particulate matter (or soot) filter system. Three different diameter (0.1, 0.2, and 0.3 mm) of alloy wire and various applied voltages from 0.5 to 3.0 kV were main variables in PWE process, while X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), and transmission electron microscope (TEM) were used to investigate the characteristics of the Fe-Cr-Al nano powders. It was controlled the number of explosion events, since evaporated and condensed nano-particles were coalesced to micron-sized secondary particles, when exceeded to the specific number of explosion events, which were not suitable for metallic porous body preparation. As the diameter of alloy wire increased, the voltage for electrical explosion increased and the size of primary particle decreased.

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Fabrication of Fe3O4/Fe/Graphene nanocomposite powder by Electrical Wire Explosion in Liquid Media and its Electrochemical Properties
Yoo-Young Kim, Ji-Seub Choi, Hoi-Jin Lee, Kwon-Koo Cho
Journal of Korean Powder Metallurgy Institute.2017; 24(4): 308. CrossRef
Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2014; 21(1): 55. CrossRef
Effect of Sintering Temperature on the High Temperature Oxidation of Fe-Cr-Al Powder Porous Metal Manufactured by Electrospray Process
Jae-Sung Oh, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 435. CrossRef

Pt and Polymer Electrolyte Membrane Fuel Cell: Hye-Sook Joo, Jung-Yeul Yun, Han-Shin Choi; J Korean Powder Metall Inst. 2011;18(1):1-13.; DOI: https://doi.org/10.4150/KPMI.2011.18.1.001

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Synthesis of Platinum Nanoparticles by Liquid Phase Reduction
Jin-Ho Lee, Se-Hoon Kim, Jin-Woo Kim, Min-Ha Lee, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 60. CrossRef
Shape Control of Platinum Nanoparticles Using a Metal Salt
Seoung Yeul Kwak, Jin Ho Lee, Jin Woo Kim, Taek Kyun Jung, Young Do Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 393. CrossRef
Luminescent Characteristics of CdSe Quantum Dot Phosphor Depending on Se Precursor Ratio
Nu Si A Eom, Taek-Soo Kim, Yong-Ho Choa, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(6): 442. CrossRef

Preparation of Ultrafine C/N Controled TiC_xN_y Powders by Magnesium Reduction: Dong-Won Lee, Byoung-Kee Kim, Jung-Yeul Yun, Ji-Hoon Yu, Yong-Jin Kim; J Korean Powder Metall Inst. 2010;17(2):142-147.; DOI: https://doi.org/10.4150/KPMI.2010.17.2.142

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The ultrafine titanium carbonitride (TiC_xN_y) particles below 100 nm in mean size, including various carbon and nitrogen contents (x=0.55~0.9, y=0.1~0.5), were successfully synthesized by new Mg-thermal reduction process. Nanostructured sub-stoichiometric titanium carbide (TiC_x) particles were initially produced by the magnesium reduction of gaseous TiCl_4+x/2C_2Cl_4 at 890°C and post heat treatments in vacuum were performed for 2 hrs to remove residual magnesium and magnesium chloride mixed with TiC_x. Finally, well C/N-controled TiC_xN_y phases were successfully produced by nitrification heat treatment under normal N_2 gas atmosphere at 1150°C for 2 hrs. The values of purity, mean particle size and oxygen content of produced particles were about 99.3%, 100 nm and 0.2 wt.%, respectively.

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Characteristics of Stainless Steel Composites with Nano-sized TiCxNy
Tae-Ho Ban, Sung-Bum Park, Soo-Jeong Jo, Dong-Won Lee, Farkhod R. Turaev, Yong-Il Park, Sung-Jin Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(3): 290. CrossRef

Synthesis and Characterization of WS₂ Nanoparticles by Chemical Vapor Condensation: Dong-Won Lee, Ju-Hyeong Kim, O. Tolochko, Jung-Yeul Yun, Byung-Kee Kim; J Korean Powder Metall Inst. 2008;15(4):314-319.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.314

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Abstract PDF: Nano-sized tungsten disulfide (WS_2) powders were synthesized by chemical vapor condensation (CVC) process using tungsten carbonyl (W(CO)_6) as precursor and vaporized pure sulfur. Prior to the synthesis of tungsten disulfide nanoparticles, the pure tungsten nanoparticles were produced by same route to define the optimum synthesis parameters, which were then successfully applied to synthesize tungsten disulfide. The influence of experimental parameters on the phase and chemical composition as well as mean size of the particles for the produced pure tungsten and tungsten disulfide nanoparticles, were investigated.

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