Journal of Powder Materials

Current Status and Future of CIGS Solar Cells Technology: Yeon-Ik Jang, Kyung-Hoon Kim, Pyuck-Pa Choi, Jong-Ku Park; J Korean Powder Metall Inst. 2008;15(3):173-181.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.173

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High magnetic performance of metal injection-molded pure iron using δ phase sintering
Lusha Tian, Mingli Qin, Jidong Ma, Lin Zhang, Xiaofeng Zhang
Materials Letters.2014; 121: 145. CrossRef
Magnetic Properties and Microstructure of High-Density Sintered Iron Formed by Warm Compaction Using Die Wall Lubrication
Shin Tajima, Takeshi Hattori, Mikio Kondoh, Hiroshi Okajima, Masaki Sugiyama, Tadayoshi Kikko
MATERIALS TRANSACTIONS.2005; 46(6): 1402. CrossRef
Influence of residual internal stresses on the coercive field of soft magnetic powders
I. Chicinaş, N. Jumate, Gh. Matei
Journal of Magnetism and Magnetic Materials.1995; 140-144: 1875. CrossRef

Superconducting Properties of Mg(B_1-xC_x)₂ Bulk Synthesized Using Magnesium and Glycerin-treated Boron Powder: Yi-Jeong Kim, Byung-Hyuk Jun, Soon-Dong Park, Kai Sin Tan, Bong-Goo Kim, Jae-Min Sohn, Chan-Joong Kim; J Korean Powder Metall Inst. 2008;15(3):182-187.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.182

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Abstract PDF: Carbon was known to be one of effective additives which can improve the flux pinning of MgB_2 at high magnetic fields. In this study, glycerin (C_3H_8O_3) was selected as a chemical carbon source for the improvement of critical current density of MgB_2. In order to replace some of boron atoms by carbon atoms, the boron powder was heat-treated with liquid glycerin. The glycerin-treated boron powder was mixed with an appropriate amount of magnesium powder to MgB_2 composition and the powder pallets were heat treated at 650°C;and;900°C for 30 min in a flowing argon gas. It was found that the superconducting transition temperature (T_c) of Mg(B_1-xC_x)_2 prepared using glycerin-treated boron powder was 36.6 K, which is slightly smaller than T_c(37.1 K) of undoped MgB_2. The critical current density (J_c) of Mg(B_1-xC_x)_2 was higher than that of undoped MgB_2 and the T_c improvement effect was more remarkable at higher magnetic fields. The T_c, decrease and J_c increase associated with the glycerin treatment for boron powder was explained in terms of the carbon substitution to boron site.

Hydrogen Storage Properties of Carbon Nanotube Composites: Jung-Ho Ahn, Min-Kyu Jang; J Korean Powder Metall Inst. 2008;15(3):188-195.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.188

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Abstract PDF: Carbon nanotube (CNT)/Mg_2Ni composites were synthesized to enhance the hydrogen storage properties. The emphasis was made on the effect of different shortening methods of CNTs on the open-tip structure and the resulting properties. The use of open CNTs as a starting material resulted in an enhanced hydrogen properties of CNT/Mg_2Ni composites. Among the employed methods for the shortening of CNTs, wet milling using ethanol was the most efficient, while ultrasonic acid treatment or thermal decomposition resulted in a less hydrogen storage capacity.

Effects of Sintering Temperature and Atmosphere on Densification of Hypereutectic Al-Si Alloy Powders: Jae-Wook Lee, Sang-Bin Park, Sang-Sun Yang, Yong-Jin Kim; J Korean Powder Metall Inst. 2008;15(3):196-203.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.196

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The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogen showed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship between slow densification and oxide surfaces of Al alloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were discussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.

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Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders
H.-S. Kim, B. Madavali, T.-J. Eom, C.-M. Kim, J.-M. Koo, T.-H. Lee, S.-J. Hong
Archives of Metallurgy and Materials.2015; 60(2): 1235. CrossRef

Analysis of Aluminum Powder Densification by Continuous Front Extrusion-Equal Channel Angular Pressing: Seung-Chae Yoon, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2008;15(3):204-209.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.204

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Abstract PDF: Aluminum alloys are not only lightweight materials, but also have excellent thermal conductivity, electrical conductivity and workability, hence, they are widely used in industry. It is important to control and enhance the densification behavior of metal powders of aluminum. Investigation on the extrusion processing combined with equal channel angular pressing for densification of aluminum powders was performed in order to develop a continuous production process. The continuous processing achieved high effective strain and full relative density at 200°C. Optimum processing conditions were suggested for good mechanical properties. The results of this simulation helped to understand the distribution of relative density and effective strain.

Preparation and Characteristics of Elongated CdSe nanoparticles: Shin-Ho Kim, Myoung-Guk Park, Yang-Do Kim; J Korean Powder Metall Inst. 2008;15(3):210-213.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.210

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Abstract PDF: Elongated CdSe nanoparticles with a diameter of 3-7nm have been successfully synthesized using two surfactants of trioctylphospine (TOP) and hexadecylamine (HDA) at 160°C. The formation of elongated CdSe nanoparticles is possibly due to the cooperative effects from both the different binding capability of two surfactants (TOP and HDA) and intrinsically anisotropic crystal structure of the CdSe. The electron diffraction pattern of CdSe nanoparticles revealed the formation of wurzite phase. The CdSe samples showed red-shifted wavelength from 560 to 580nm with increasing the refluxing time due to the gradual growth of CdSe nanoparticles. The relatively broad absorption band can be attributed to the surface state of CdSe nanoparticles. The possible formation mechanism of elongated CdSe nanoparticles was proposed and the characteristics of CdSe have been discussed as well.

Theoretical Study on the Consolidation Behavior and Mechanical Property for Molybdenum Powders: Young-Moo Kim; J Korean Powder Metall Inst. 2008;15(3):214-220.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.214

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Abstract PDF: In this study, consolidation behavior and hardness of commercially available molybdenum powder were investigated. In order to analyze compaction response of the powders, the elastoplastic constitutive equation based on the yield function by Shima and Oyane was applied to predict the compact density under uniaxial pressure from 100MPa to 700MPa. The compacts were sintered at 1400-1600°C for 20-60 min. The sintered density and grain size of molybdenum were increased with increasing the compacting pressure and processing temperature and time. The constitutive equation, proposed by Kwon and Kim, was applied to simulate the creep densification rate and grain growth of molybdenum powder compacts. The calculated results were compared with experimental data for the powders. The effects of the porosity and grain size on the hardness of the specimens were explained based on the modified plasticity theory of porous material and Hall-Petch type equation.

Synthesis of Ag-Cu Composite Powders for Electronic Materials by Electroless Plating Method: C.H. Yoon, J.G. Ahn, D.J. Kim, J.S. Sohn, J.S. Park, Y.G. Ahn; J Korean Powder Metall Inst. 2008;15(3):221-226.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.221

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Abstract PDF: Silver coated copper composite powders were prepared by electroless plating method by controlling the activation and deposition process variables such as feeding rate of silver ions solution, concentration of reductant and molar ratio of activation solution (NH_4OH/(NH_4)_2SO_4) at room temperature. The characteristics of the product were verified by using a scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic absorption (A.A.). It is noted that completely cleansing the copper oxide layers and protecting the copper particles surface from hydrolysis were important to obtain high quality Ag-Cu composite powders. The optimum conditions of Ag-Cu composite powder synthesis were NH_4OH/(NH_4)_2SO_4 molar ratio 4, concentration of reductant 15g/l and feeding rate of silver ions solution 2 ml/min.

Finite Element Analysis on the Impactive Deformation of a Cu Particle in Cold Spraying Processing : Effect of Velocity: Kyu-Jin Cho, Seung-Chae Yoon, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2008;15(3):227-233.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.227

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Abstract PDF: Dynamic plastic deformation behavior of copper particles occurred during the cold spray processing was numerically analyzed using the finite element method. The study was to investigate the impact as well as the heat transfer phenomena, happened due to collision of the copper particle of 20µm in diameter with various initial velocities of 300sim600m/s into the copper matrix. Effective strain, temperature and their distribution were investigated for adiabatic strain and the accompanying adiabatic shear localization at the particle/substrate interface.

Fabrication of Porous Nano Particles from Al-Cu Alloy Nano Powders Prepared by Electrical Wire Explosion: Je-Shin Park, Won-Baek Kim, Chang-Youl Suh, Jong-Gwan Ahn, Byoung-Kyu Kim; J Korean Powder Metall Inst. 2008;15(3):234-238.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.234

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Al-Cu alloy nano powders have been produced by the electrical explosion of Cu-plated Al wire. The porous nano particles were prepared by leaching for Al-Cu alloy nano powders in 40wt% NaOH aqueous solution. The surface area of leached powder for 5 hours was 4 times larger than that of original alloy nano powder. It is demonstrated that porous nano particles could be obtained by selective leaching of alloy nano powder. It is expected that porous Cu nano powders can be applied for catalyst of SRM (steam reforming methanol).

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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
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 112. 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
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 105. CrossRef

Estimation of a Lattice Parameter of Sintered Ni-W Alloy Rods by a Neutron Diffraction Method: Chan-Joong Kim, Min-Woon Kim, Soon-Dong Park, Byung-Hyuk Jun, Serk-Won Jang, Baek-Seok Seong; J Korean Powder Metall Inst. 2008;15(3):239-243.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.239

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Abstract PDF: Ni-W(1-5 at.%) alloy rods were made by powder metallurgy process including powder mixing, compacting and subsequent sintering. Ni and W powder of appropriate compositions were mixed by a ball milling and isostatically pressed in a rubber mold into a rod. The compacted rods were sintered at 1000°C-1150°C at a reduced atmosphere for densification. The lattice parameters of Ni-W alloys were estimated by a high resolution neutron powder diffractometer. All sintered rods were found to have a face centered cubic structure without any impurity phase, but the diffraction peak locations were linearly shifted with increasing W content. The lattice parameter of a pure Ni rod was 3.5238AA which is consistent with the value reported in JCPDS data. The lattice parameter of N-W alloy rods increased by 0.004AA for 1 atomic % of W, which indicates the formation of a Ni-W solid solution due to the substitution of nickel atoms by tungsten atoms of larger size.

비정질/나노구조 투사재(shot peening ball)의 개발동향 및 전망: Jin-Gyu Lee; J Korean Powder Metall Inst. 2008;15(3):244-248.; DOI: https://doi.org/10.4150/KPMI.2008.15.3.244

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