Journal of Powder Materials

Volume 19(5); October 2012

Densification of Copper Powders using High-pressure Torsion Process: Dong-Jun Lee, Eun-Yoo Yoon, Soo-Young Kang, Jung-Hwan Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2012;19(5):333-337.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.333

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In this study, electrolytic copper powders were consolidated by high-pressure torsion process (HPT) which is the most effective process to produce bulk ultrafine grained and nanocrystalline metallic materials among various severe plastic deformation processes. The bulk samples were manufactured by the HPT process at 2.5 GPa and 1/2, 1 and 10 turns. After 10 turns, full densification was achieved by high pressure with shear deformation and ultrafine grained structure (average grain size of 677 nm) was observed by electron backscatter diffraction and a scanning transmission electron microscope.

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Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method
Dong Jun Lee, Eun Yoo Yoon
Journal of Korean Powder Metallurgy Institute.2015; 22(1): 6. CrossRef
Microstructure Evolution and Mechanical Properties of Al-1080 Processed by a Combination of Equal Channel Angular Pressing and High Pressure Torsion
Mohamed Ibrahim Abd El Aal, Eun Yoo Yoon, Hyoung Seop Kim
Metallurgical and Materials Transactions A.2013; 44(6): 2581. CrossRef

Fabrication of Ultrafine Tungsten-based Composite Powders by Novel Reduction Process: Dong-Won Lee; J Korean Powder Metall Inst. 2012;19(5):338-342.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.338

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Abstract PDF: A novel chemical method was evaluated to fabricate the ultrafine tungsten heavy alloy powders with bater-base solution made from the ammonium metatungstate (AMT), iron(II) chloride tetrahydrate (FeCl_2cdot4H_2O), nickel(II) chloride hexahydrate (NiCl_2cdot6H_2O) as source materials and the sodium tungstate dihydrate (NaWO_4cdot2H_2O) as Cl-reductant. In the preparation of mixtures the amounts of the source components were chosen so as to obtain alloy of 93W-5Ni-2Fe composition(wt.%). The obtained powders were characterized by X-ray diffraction, XRF, field-emission scanning microscope (FESEM), and chemical composition was analyzed by EDX.

Low Temperature Debinding Process Using Oxygen Plasma for Flexible Printed Electronics: Young-In Lee; J Korean Powder Metall Inst. 2012;19(5):343-347.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.343

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In this study, an oxygen plasma treatment was used as a low temperature debinding method to form a conductive copper feature on a flexible substrate using a direct printing process. To demonstrate this concept, conductive copper patterns were formed on polyimide films using a copper nanoparticle-based paste with polymeric binders and dispersing agents and a screen printing method. Thermal and oxygen plasma treatments were utilized to remove the polymeric vehicle before a sintering of copper nanoparticles. The effect of the debinding methods on the phase, microstructure and electrical conductivity of the screen-printed patterns was systematically investigated by FE-SEM, TGA, XRD and four-point probe analysis. The patterns formed using oxygen plasma debinding showed the well-developed microstructure and the superior electrical conductivity compared with those of using thermal debinding.

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Research on new ceramic debinding technology with low energy consumption via dielectric barrier discharge
Yimeng Huang, Yong Liu, Nianping Yan, Xuetong Zhao, Xinhao Zhao, Yueji Li, Xilin Wang, Zhidong Jia
Physica Scripta.2023; 98(4): 045904. CrossRef
Green Manufacturing of Highly Conductive Cu2O and Cu Nanoparticles for Photonic-Sintered Printed Electronics
Young-Tae Kwon, Seung-Jae Yune, Yoseb Song, Woon-Hong Yeo, Yong-Ho Choa
ACS Applied Electronic Materials.2019; 1(10): 2069. CrossRef
Fabrication of Micro Pattern on Flexible Substrate by Nano Ink using Superhydrophobic Effect
Soo-Jung Son, Young-Sang Cho, Jong Joo Rha, Chul-Jin Cho
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 120. CrossRef

Effects of Powder Morphology and Powder Preheating on the Properties and Deposition Behavior of Titanium Coating Layer Manufactured by Cold Spraying: Jae-Nam Hwang, Myeong-Ju Lee, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee; J Korean Powder Metall Inst. 2012;19(5):348-355.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.348

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Cold spray deposition using Titanium powder was carried out to investigate the effects of powder morphology and powder preheating on the coating properties such as porosity and hardness. The in-flight particle velocity of Ti powder in cold spray process was directly measured using the PIV (particle image velocimetry) equipment. Two types of powders (spherical and irregular ones) were used to manufacture cold sprayed coating layer. The results showed that the irregular morphology particle appeared higher in-flight particle velocity than that of the spherical one under the same process condition. The coating layer using irregular morphology powder represented lower porosity level and higher hardness. Two different preheating conditions (no preheating and preheating at 500°C) were used in the process of cold spraying. The porosity decreased and the hardness increased by conducting preheating at 500°C. It was found that the coating properties using different preheating conditions were dependent not on the particle velocity but on the deformation temperature of particle. The deposition mechanism of particles in cold spray process was also discussed based on the experimental results of in flight-particle velocity.

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Solid-state cold spray additive manufacturing of pure tantalum with extraordinary high-temperature mechanical properties
Young-Kyun Kim, Hyung-Jun Kim, Kee-Ahn Lee
Journal of Materials Research and Technology.2023; 23: 5698. CrossRef
Effect of Fe Content on the Microstructure and Mechanical Properties of Ti-Al-Mo-V-Cr-Fe Alloys
K.C. Bae, J.J. Oak, Y.H. Kim, Y.H. Park
Archives of Metallurgy and Materials.2017; 62(2): 1105. CrossRef
Effects Of Process Parameters On Cu Powder Synthesis Yield And Particle Size In A Wet-Chemical Process
Y.M. Shin, J.-H. Lee
Archives of Metallurgy and Materials.2015; 60(2): 1247. CrossRef
Property Evaluation of Kinetic Sprayed Al-Ni Composite Coatings
GyeongJun Byun, JaeIck Kim, Changhee Lee, SeeJo Kim, Seong Lee
Journal of Welding and Joining.2014; 32(5): 72. CrossRef
Manufacturing and Properties of CGI-based Composite Coating Layer Utilizing a Warm Spray Process and Cu-Ga and Cu-In Mixed Powders
Min-Gwang Jeon, Myeong-Ju Lee, Hyeong-Jun Kim, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2014; 21(3): 229. CrossRef
Effect of Carrier Gases on the Microstructure and Properties of Ti Coating Layers Manufactured by Cold Spraying
Myeong-Ju Lee, Hyung-Jun Kim, Ik-Hyun Oh, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(1): 24. CrossRef

Synthesis of Ultrafine and Less Agglomerated TiCN Powders by Magnesiothermic Reduction: Dong-Won Lee; J Korean Powder Metall Inst. 2012;19(5):356-361.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.356

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Abstract PDF: The ultra-fine and less agglomerated titanium carbonitride particles were successfully synthesized by magnesiothermic reduction with low feeding rate of TiCl_4+1/4C_2Cl_4 solution. The sub-stoichiometric titanium carbide (TiC_0.5sim0.6) particles were produced by reduction of chlorine component by liquid magnesium at 800°C of gaseous TiCl_4+1/4C_2Cl_4 and the heat treatments in vacuum were performed for 5 hours to remove the residual magnesium and magnesium chloride mixed with produced TiC_sim0.5. The final TiC_sim0.5N_0sim0.5 particle with near 100 nm in mean size and high specific surface area of 65m2/g was obtained by nitrification under nitrogen gas at 1,150°C for 2 hrs.

Effect of Carboxylic Acid on Optical Properties of CuInS₂/ZnS Semiconductor Nanocrystals: Si-Hyun Ahn, Gyu-Che Choi, Yeun-Kyung Beak, Young-Kuk Kim, Yang-Do Kim; J Korean Powder Metall Inst. 2012;19(5):362-366.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.362

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We report the effect of the chain length of carboxylic acid on the photoluminescence(PL) of CuInS_2/ZnS nanocrystals. CuInS_2/ZnS nanocrystals with emission wavelength ranging from 566 nm through 583 nm were synthesized with zinc acetate and carboxylic acids with various chain length. In this study, CuInS_2/ZnS nanocrystals prepared using long chain carboxylic acid showed more improved PL intensity. The origin of strong photoluminescence of the nanocrystals prepared with zinc acetate and long chain carboxylic acid was ascribed to improved size distribution due to strong reactivity between long chain carboxylic acid and zinc acetate.

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Surface Treatment Method for Long-term Stability of CdSe/ZnS Quantum Dots
Hyun-Su Park, Da-Woon Jeong, Bum-Sung Kim, So-Yeong Joo, Chan-Gi Lee, Woo-Byoung Kim
Journal of Korean Powder Metallurgy Institute.2017; 24(1): 1. CrossRef
Enhanced magnetic properties of NiO powders by the mechanical activation of aluminothermic reduction of NiO prepared by a ball milling process
Aneeta Manjari Padhan, P. Ravikumar, P. Saravanan, Perumal Alagarsamy
Journal of Magnetism and Magnetic Materials.2016; 418: 253. CrossRef
Physical Properties Assessment of Soft Contact Lens with Halogen and Carboxylic Substituted Pyridine as Additive
Duck-Hyun Kim, A-Young Sung
Journal of Korean Ophthalmic Optics Society.2015; 20(4): 437. CrossRef
Improved Luminescent Characterization and Synthesis of InP/ZnS Quantum Dot with High-Stability Precursor
Eun-Jin Lee, Jong-Woo Moon, Yang-Do Kim, Pyung-Woo Shin, Young-Kuk Kim
Journal of Korean Powder Metallurgy Institute.2015; 22(6): 385. CrossRef

Synthesis and Characterization of Cu Nanowires Using Anodic Alumina Template Based Electrochemical Deposition Method: Young-In Lee, Yong-Ho Choa; J Korean Powder Metall Inst. 2012;19(5):367-372.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.367

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Abstract PDF: Single crystalline Cu nanowires with controlled diameters and aspect ratios have been synthesized using electrochemical deposition within confined nanochannels of a porous anodic aluminium oxide(AAO) template. The diameters of nano-sized cylindrical pores in AAO template were adjusted by controlling the anodization conditions. Cu nanowires with diameters of approximately 38, 99, 274 nm were synthesized by the electrodeposition using the AAO templates. The crystal structure, morphology and microstructure of the Cu nanowires were systematically investigated using XRD, FE-SEM, TEM and SAED. Investigation results revealed that the Cu nanowires had the controlled diameter, high aspect ratio and single crystalline nature.

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.

Effect of the Size and Amount of SiC on the Microstructures and Thermal Conductivities of ZrB₂-SiC Composite Ceramics: Seong-Won Kim, Chang-Sup Kwon, Yoon-Suk Oh, Sung-Min Lee, Hyung-Tae Kim; J Korean Powder Metall Inst. 2012;19(5):379-384.; DOI: https://doi.org/10.4150/KPMI.2012.19.5.379

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This paper reports the microstructures and thermal conductivities of ZrB_2-SiC composite ceramics with size and amount of SiC. We fabricated sintered bodies of ZrB_2-x vol.% SiC (x=10, 20, 30) with submicron and nanosized SiC densified by spark plasma sintering. Microstructure retained the initial powder size of especially SiC, except the agglomeration of nanosized SiC. For sintered bodies, thermal conductivities were examined. The observed thermal conductivity values are 40~60 W/mK, which is slightly lower than the reported values. The relation between microstructural parameter and thermal conductivity was also discussed.

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Analysis of Polymer Hybrid-coated Anodic Aluminum Oxide
Mira Kim, Yeongwoo Kim, Hakyoung Lee, Chan-Young Park, Won-Ki Lee, Taeho Kang, Kwon Taek Lim
Molecular Crystals and Liquid Crystals.2015; 622(1): 120. CrossRef
Thermal Properties of Diamond Aligned Electroless Ni Plating Layer/Oxygen Free Cu Substrates
Da-Woon Jeong, Song-Yi Kim, Kyoung-Tae Park, Seok-Jun Seo, Taek Soo Kim, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2015; 22(2): 134. CrossRef
Effect of the SiC Size on the Thermal and Mechanical Properties of Reaction-bonded Silicon Carbide Ceramics
Chang-Sup Kwon, Yoon-Suk Oh, Sung-Min Lee, Yoonsoo Han, Hyun-Ick Shin, Youngseok Kim, Seongwon Kim
Journal of Korean Powder Metallurgy Institute.2014; 21(6): 467. CrossRef

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