Journal of Powder Materials

Volume 17(6); December 2010

Recycling Technology of Nd-Fe-B based Rare Earth Element Magnets: Han-Shin Choi, Yong-Hwan Kim; J Korean Powder Metall Inst. 2010;17(6):435-442.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.435

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Preparation of Iron Nano-particle by Slurry Reduction Method from Leaching Solution of Spent Nd magnet
Jong-Gwan Ahn, Ryunji Gang, Haebin You, Ho-Sung Yoon
Journal of the Korean Institute of Resources Recycling.2014; 23(6): 22. CrossRef
Synthesis of Iron Nanopowder from FeCl3Solution by Chemical Reduction Method for Recycling of Spent Neodymium Magnet
Yonghwang Ha, Ryun-Ji Gang, Seung-Hoon Choi, Ho-Sung Yoon, Jong-Gwan Ahn
Journal of the Korea Academia-Industrial cooperation Society.2012; 13(12): 6187. CrossRef

Fabrication of Ultra Fine β-phase Ti-Nb-Sn-HA Composite by Pulse Current Activated Sintering: Kee-Do Woo, Xiaopeng Wang, Duck-Soo Kang, Sang-Hyuk Kim, Jeong-Nam Woo, Sang-Hoon Park, Zhiguang Liuc; J Korean Powder Metall Inst. 2010;17(6):443-448.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.443

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The beta phase Ti-Nb-Sn-HA bio materials were successfully fabricated by high energy mechanical milling and pulse current activated sintering (PCAS). Ti-6Al-4V ELI alloy has been widely used as biomaterial. But the Al has been inducing Alzheimer disease and V is classified as toxic element. In this study, ultra fine sized Ti-Nb-Sn-HA powder was produced by high energy mechanical milling machine. The beta phase Ti-Nb-Sn-HA powders were obtained after 12hr milling from alpha phase. And ultra fine grain sized Ti-Nb-Sn-HA composites could be fabricated using PCAS without grain growth. After sintering, the microstructures and phase-transformation of Ti-Nb-Sn-HA biomaterials were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The relative density was obtained by Archimedes principle and the hardness was measured by Vickers hardness tester. The beta-Ti phase was obtained after 12h milling. As result of hardness and relative density, 12h milled Ti-Nb-Sn-HA composite has the highest values.

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Microstructure and Biocompatibility of Ti-Nb-Si-HA Composites Fabricated by Rapid Sintering Using HEMM Powders
ee-Do Woo K, 상혁 김, 동수 강, ong-Gun Kim D
Korean Journal of Materials Research.2013; 23(7): 353~358. CrossRef

Coating Property of Hybrid Structured Photo-Electrode to Increase Dye-Sensitized Solar Cells Efficiency: Min-Hee Kim, Hyung-Woo Lee, Young-Keun Jeong; J Korean Powder Metall Inst. 2010;17(6):449-455.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.449

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The hybrid structured photo-electrode for dye-sensitized solar cells was fabricated based on the composites of TiO_2 nanoparticles and nanowires. Three samples with different hybrid structures were prepared with 17 vol%, 43 vol%, and 100 vol% nanowires. The energy conversion efficiency was enhanced from 5.54% for pure nanoparticle cells to 6.01% for the hybrid structure with 17 vol% nanowires. For the hybrid structured layers with high nanowires concentration (43 vol% and 100 vol%), the efficiency decreased with the nanowire concentration, because of the decrease of specific surface area, and of thus decreased current density. The random orientations of TiO_2 nanowires can be preserved by the doctor blade process, resulted in the enhanced efficiency. The hybrid structured TiO_2 layer can possess the advantages of the high surface area of nanoparticles and the rapid electron transport rate and the light scattering effect of nanowires.

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N-Doped ZnO Nanoparticle-Carbon Nanofiber Composites for Use as Low-Cost Counter Electrode in Dye-Sensitized Solar Cells
하림 안, 효진 안
Korean Journal of Materials Research.2014; 24(10): 565~571. CrossRef

Coatings Properties and Efficiency Performance of Cr-DLC Films Deposited by Hybrid Linear Ion Source for Hydraulic Gear Pump: Sun-Yong Cha, Wang-Ryeol Kim, Min-Suk Park, Se-Hun Kwon, Won-Sub Chung, Myung-Chang Kang; J Korean Powder Metall Inst. 2010;17(6):456-463.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.456

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Abstract PDF: This paper describes the results of the application of Cr-Diamond-like carbon (DLC) films for efficiency improvement through surface modification of spur gear parts in the hydraulic gear pump. Cr-DLC films were successfully deposited on SCM 415 substrates by a hybrid coating process using linear ion source (LIS) and magnetron sputtering method. The characteristics of the films were systematically investigated using FE-SEM, nano-indentation, sliding tester and AFM instrument. The microstructure of Cr-DLC films turned into the dense and fine grains with relatively preferred orientation. The thickness formed in our Cr buffer layer and DLC coating layer were obtained the 487 nm and 1.14;µm. The average friction coefficient of Cr-DLC films considerably decreased to 0.15 for 0.50 of uncoated SCM415 material. The hardness and surface roughness of Cr-DLC films were measured 20 GPa and 10.76 nm, respectively. And then, efficiency tests were performed on the hydraulic gear pump to investigate the efficiency performance of the Cr-DLC coated spur gear. The experimental results show that the volumetric and mechanical efficiency of hydraulic gear pump using the Cr-DLC spur gear were improved up to 2~5% and better efficiency improvement could be attributed to its excellent microstructure, higher hardness, and lower friction coefficient. This conclusion proves the feasibility in the efficiency improvement of hydraulic gear pump for industrial applications.

One-step Physical Method for Synthesis of Cu Nanofluid in Ethylene Glycol: L.H. Bac, K.S. Yun, J.S. Kim, J.C. Kim, C.K. Rhee; J Korean Powder Metall Inst. 2010;17(6):464-469.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.464

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The Cu nanofluid in ethylene glycol was prepared by electrical explosion of wire, a novel one-step method. The X-ray diffraction, field emission scanning electron microscope and transmission electron microscope were used to study the properties of Cu nanoparticles. The results showed that the nanoparticles were consisted of pure face-centered cubic structure and near spherical shape with average grain size of 65 nm. Ultraviolet-visible spectroscopy (UV-Vis) confirmed Cu nanoparticles with a single absorbance peak of Cu surface plasmon resonance band at 600 nm. The nanofluid was found to be stable due to high positive zeta potential value, +51 mV. The backscattering level of nanofluid in static stationary was decreased about 2% for 5 days. The thermal conductivity measurement showed that Cu-ethylene glycol nanofluid with low concentration of nanoparticles had higher thermal conductivity than based fluid. The enhancement of thermal conductivity of nanofluid at a volume fraction of 0.1% was approximately 5.2%.

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Enhanced heat transfer of laser-fabricated copper nanofluid at ultra-low concentration driven by the nanoparticle surface area
S. Khamlich, J. Jakobi, T. Khamliche, F. Ismail, O. Nemraoui, C. Rehbock, V. Fester, S. Barcikowski
Journal of Molecular Liquids.2023; 383: 122104. CrossRef
Preparation and thermophysical study on a super stable copper oxide/deep eutectic solvent nanofluid
Changhui Liu, Yu Yan, Wenjie Sun, Xiancong Shi, Ningyu Shi, Yixuan Huo, Jiateng Zhao, Zafar Said, Mohsen Sharifpur
Journal of Molecular Liquids.2022; 356: 119020. CrossRef
Electroexplosive Technology of Nanopowders Production: Current Status and Future Prospects
Young-Soon Kwon, Jin-Chun Kim, Alexander P. Ilyin, Olga B. Nazarenko, Dmitry V. Tikhonov
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 40. CrossRef
Effect of Electrical Parameters and Surrounding Gas on the Electroexplosive Tungsten Nanopowders Characteristics
Young-Soon Kwon, Jin-Chun Kim, Alexander P. Ilyin, Olga B. Nazarenko, Dmitry V. Tikhonov
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 49. CrossRef
Characterization and Stability of Silver Nanoparticles in Aqueous Solutions
L.H. Bac, W.H. Gu, J.C. Kim, B.K. Kim, J.S. Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 55. CrossRef

Microstructure and Tensile Properties of Spray Cast Cu-Sn-Ni-Si Alloy: Hee-Soo Kang, Eon-Sik Lee, Gyu-Chang Lee, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2010;17(6):470-476.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.470

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Abstract PDF: In this study, Cu-10Sn and Cu-10Sn-2Ni-0.2Si alloys have been manufactured by spray casting in order to achieve a fine scale microstructure and high tensile strength, and investigated in terms of microstructural evolution, aging characteristics and tensile properties. Spray cast alloys had a much lower microhardness than continuous cast billet because of an improved homogenization and an extended Sn solid solubility. Spray cast Cu-Sn-Ni-Si alloy was characterized by an equiaxed grain microstructure with a small-sized (Ni, Si)-rich precipitates. Cold rolling of Cu-Sn-Ni-Si alloy increased a tensile strength to 1220 MPa, but subsequent ageing treatment reduced a ultimate tensile strength to 780 MPa with an elongation of 18%.

Microstructural Evolution and Tensile Properties of Cu-Sn Based Alloys Manufactured by Spray Casting Route: Sang-Hyun Shim, Hee-Soo Kang, Kyeong-Ho Baik; J Korean Powder Metall Inst. 2010;17(6):477-481.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.477

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Cu-Sn based alloys were manufactured by gas atomization spray casting route in order to achieve a fine scale microstructure and a high tensile strength. The spray cast Cu-10Sn-2Ni-0.2Si alloy had an equiaxed grain microstructure, with no formation of brittle delta-Cu_41Sn_11 phase. Aging treatment promoted the precipitation of finely distributed particles corresponding to delta-Ni_2Si intermetallic phase throughout the alpha-(CuSn) matrix. The cold-rolled Cu-Sn-Ni-Si alloy had a very high tensile strength of 1200 MPa and an elongation of 5%. Subsequent aging treatment at 450°C for 1h slightly reduced the tensile strength to 700 MPa and remarkably increased the elongation up to 30%. This result has been explained by coarsening the precipitates due to over aging and reducing the dislocation density due to annealing effects.

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Modificated microstructure and enhanced mechanical properties of Cu-Sn-P alloy with rare earth La addition
Songwei Wang, Kangkang Yu, Shuaifeng Chen, Siying Deng, Hongwu Song, Shihong Zhang
Materials Today Communications.2024; 39: 109304. CrossRef
Co and Ti effect on hot workability of phosphor bronze
Hyeon Seok Shin, Seung Zeon Han, Eun-Ae Choi, Jee Hyuk Ahn, Sangshik Kim, Jehyun Lee
Journal of Alloys and Compounds.2022; 903: 163778. CrossRef
Microstructural Feature and Aging Characteristics of Spray-Formed Cu-5Ni-10Sn Alloy
Dae-Gyun Roh, Hee-Soo Kang, Kyeong-Ho Baik
Journal of Korean Powder Metallurgy Institute.2012; 19(4): 317. CrossRef

Phase Transformation and Microstructure of FeSi₂ Thermoelectric Compounds Manufactured by Powder Metallurgy: Kyoung-Tae Park, Jin-Gyo Shin, Soon-Jik Hong, Byong-Sun Chun; J Korean Powder Metall Inst. 2010;17(6):482-488.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.482

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Abstract PDF: In this study, FeSi_2 as high temperature performance capable thermoelectric materials was manufactured by powder metallurgy.The as-casted Fe-Si alloy was annealed for homogenization below 1200°C for 3 h. Due to its high brittleness, the cast alloy transformed to fine powders by ball-milling, followed by subsequent compaction (hydraulic pressure; 2 GPa) and sintering (1200°C, 12 h). In order to precipitate beta-FeSi_2, heat treatment was performed at 850°C with varying dwell time (7, 15 and 55 h). As a result of this experiment thermoelectric phase beta-FeSi_2 was quickly transformed by powder metallurgical process. There was not much change in powder factor between 7h and 55h specimens.

Fabrication and Properties of Alloy Foam Materials using Metal Powders: James Choi, Ku-Hwan Kim; J Korean Powder Metall Inst. 2010;17(6):489-493.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.489

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Nickel-based and iron-based alloys have been developed and commercialized for a wide range of high performance applications at severely corrosive and high temperature environment. This alloy foam has an outstanding performance which is predestinated for diesel particulate filters, heat exchangers, and catalyst support, noise absorbers, battery, fuel cell, and flame distributers in burners in chemical and automotive industry. Production of alloy foam starts from high-tech coating technology and heat treatment of transient liquid-phase sintering in the high temperature. These technology allow for preparation of a wide variety of foam compositions such as Ni, Cr, Al, Fe on various pore size of pure nickel foam or iron foam in order for tailoring material properties to a specific application.

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Fabrication and High-Temperature Compressive Behavior of Unique Multi-Sheet Stacked Block Ni–Cr–Al Metallic Foam
Kyu-Sik Kim, Tae-Hoon Kang, Man-Ho Park, Kee-Ahn Lee
Metals and Materials International.2021; 27(5): 1138. CrossRef
Fabrication and Mechanical Properties of Open‐Cell Austenitic Stainless Steel Foam by Electrostatic Powder Spraying Process
Tae-Hoon Kang, Kyu-Sik Kim, Jung-Yeul Yun, Min-Jeong Lee, Kee-Ahn Lee
Advanced Engineering Materials.2020;[Epub] CrossRef
Structural Characteristics, Microstructure and Mechanical Properties of Fe-Cr-Al Metallic Foam Fabricated by Powder Alloying Process
Kyu-Sik Kim, Byeong-Hoon Kang, Man-Ho Park, Jung-Yeul Yun, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2020; 27(1): 37. CrossRef
Effect of Strain Rate and Loading Direction on the Mechanical Properties of Ni-Cr-Al Superalloy Foam Fabricated by Powder Alloying Method
Kyu-Sik Kim, Jung-Suk Bae, Jae-Sung Oh, Kee-Ahn Lee
Korean Journal of Metals and Materials.2020; 58(6): 375. CrossRef
Asymmetry in the Mechanical Properties of Block Ni-Cr-Al Superalloy Foam Fabricated by the Combination of Powder Alloying and Hot Rolling Processes
Kyu-Sik Kim, Min-Chul Shim, Man-Ho Park, Jung-Yeul Yun, Kee-Ahn Lee
Korean Journal of Metals and Materials.2020; 58(2): 103. CrossRef
A Study on Pore Properties of SUS316L Powder Porous Metal Fabricated by Electrostatic Powder Coating Process
Min-Jeong Lee, Yu-Jeong Yi, Hyeon-Ju Kim, Manho Park, Byoung-Kee Kim, Jung-Yeul Yun
Journal of Korean Powder Metallurgy Institute.2018; 25(5): 415. CrossRef
Microstructure and Tensile Deformation Behavior of Ni-Cr-Al Powder Porous Block Material
Chul-O Kim, Jung-Suk Bae, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2015; 22(2): 93. CrossRef
High temperature oxidation behavior of Ni-Cr-Al based powder porous metal
Jae-Sung Oh, Min-Chul Shim, Man-Ho Park, Kee-Ahn Lee
Metals and Materials International.2014; 20(5): 915. 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 the pore size on the creep deformation behavior of Ni-Fe-Cr-Al porous metal
Kyu-Sik Kim, Jung-Yeol Yun, Baig-Gyu Choi, Kee-Ahn Lee
Metals and Materials International.2014; 20(3): 507. CrossRef
Effect of Pre-Oxidation on the High Temperature Oxidation Behavior of Fe-Cr-Al Powder Porous Metal
Jae Sung Oh, Seon Hui Lim, Sung Hwan Choi, Man Ho Park, Kee Ahn Lee
Advanced Materials Research.2013; 690-693: 294. 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
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 122. CrossRef
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Journal of Korean Powder Metallurgy Institute.2011; 18(6): 502. CrossRef

Thermoelectric Properties of Rapid Solidified p-type Bi₂Te₃ Alloy Fabricated by Spark Plasma Sintering(SPS) Process: Chul-Dong Moon, Soon-Jik Hong, Do-Hyang Kim, Taek-Soo Kim; J Korean Powder Metall Inst. 2010;17(6):494-498.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.494

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The p-type thermoelectric compounds of Bi_2Te_3 based doped with 3wt% Te were fabricated by a combination of rapid solidification and spark plasma sintering (SPS) process. The effect of holding time during spark plasma sintering (SPS) on the microstructure and thermoelectric properties were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD) and thermoelectric properties. The powders as solidified consisted of homogeneous thermoelectric phases. The thermoelectric figure of merit measured to be maximum (3.41times10-3/K) at the SPS temperature of 430°C.

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Effect of Sintering Temperature on the Thermoelectric Properties of Bismuth Antimony Telluride Prepared by Spark Plasma Sintering
경석 이, 영근 정, 성호 서, 상현 진, 봉영 유
Korean Journal of Materials Research.2012; 22(6): 280~284. CrossRef

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