Journal of Powder Materials

Production and Application of Nd-Fe-B Sintered Magnets: Se-Hoon Kim, Young-Do Kim, Tae-Suk Jang; J Korean Powder Metall Inst. 2008;15(4):263-270.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.263

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A novel composite hot-extruded Nd-Fe-B permanent magnetic ring
Yajing Li, Siyuan Zuo, Liyun Zheng, Minggang Zhu, Yikun Fang, Lixin Zhao, Chenglin Li, Wei Li, George C. Hadjipanayis
Journal of Magnetism and Magnetic Materials.2023; 577: 170781. CrossRef
Sintering Behavior and Phase Analysis of (Nd, Dy)-Fe-B Powder
Se-Hoon Kim, Jin-Woo Kim, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(2): 154. CrossRef
Trend in Research and Development Related to Sm-Fe-N Bonded Magnets
Jung-Goo Lee, Hun Kwak, Chul-Jin Choi, Joon-Chul Yun, Jai-Sung Lee
Journal of Korean Powder Metallurgy Institute.2009; 16(1): 1. CrossRef

Sintering Behavior of Fe Nanopowder Agglomerates Prepared by Pressureless Compaction: Woo-Kyung You, Sung-Soo Jung, Jai-Sung Lee; J Korean Powder Metall Inst. 2008;15(4):271-278.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.271

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Sintering behavior of iron nanopowder agglomerate compact prepared by slurry compaction method was investigated. The Fe nanopowder agglomerates were prepared by hydrogen reduction of spray dried agglomerates of ball-milled Fe_2O_3 nanopowder at various reduction temperatures of 450°C, 500°C and 550°C, respectively. It was found that the Fe nanopowder agglomerates produced at higher reduction temperature have a higher green density compact which consists of more densified nanopowder agglomerates with coarsed nanopowders. The sintering behavior of the Fe nanopowder agglomerates strongly depended on the powder packing density in the compact and microstructure of the agglomerated nanopowder. It was discussed in terms of two sintering factors affecting the entire densification process of the compact.

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A Feasibility Study on the Surface Hardening of Sintered Iron Nanopowder by Plasma Ion Nitriding
Joon-Chul Yun, Jai-Sung Lee
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 13. CrossRef
Low temperature powder injection molding of iron micro-nano powder mixture
Woo-Kyung You, Joon-Phil Choi, Su-Min Yoon, Jai-Sung Lee
Powder Technology.2012; 228: 199. CrossRef

High-Frequency Induction-Heated Combustion Synthesis and Consolidation of Nanostructured NbSi₂ from Mechanically Activated Powders: Byung-Ryang Kim, Jin-Kook Yoon, Kee-Seok Nam, In-Jin Shon; J Korean Powder Metall Inst. 2008;15(4):279-284.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.279

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Abstract PDF: Dense nanostructured NbSi_2 was synthesized by high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 minute in one step from mechanically activated Nb and Si powders. Highly dense NbSi_2 with relative density of up to 99% was simultaneously synthesized and consolidated under the combined effects of an induced current and mechanical pressure of 60 MPa. The average grain size and mechanical properties (hardness and fracture toughness) of the compound were investigated.

Composite and Spark Plasma Sintering of the Atomized Fe Amorphous Powders and Wire-exploded Cu Nanopowder in Liquid: Jin-Chun Kim, Wang-Heo Goo, Joo-Sik Yoo; J Korean Powder Metall Inst. 2008;15(4):285-291.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.285

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Abstract PDF: Fe based (Fe_68.2C_5.9Si_3.5B_6.7P_9.6Cr_2.1Mo_2.0Al_2.0) amorphous powder were produced by a gas atomization process, and then ductile Cu powder fabricated by the electric explosion of wire(EEW) were mixed in the liquid (methanol) consecutively. The Fe-based amorphous - nanometallic Cu composite powders were compacted by a spark plasma sintering (SPS) processes. The nano-sized Cu powders of sim;nm200 produced by EEW in the methanol were mixed and well coated with the atomized Fe amorphous powders through the simple drying process on the hot plate. The relative density of the compacts obtained by the SPS showed over 98% and its hardness was also found to reach over 1100 Hv.

Electromagnetic Wave Absorption Behavior of a Fe-based Nanocrystalline Alloy mixed with a Ferrite Powder: S.K. Koo, M.H. Lee, B.G. Moon, Y.S. Song, K.Y. Sohn, W.W. Park; J Korean Powder Metall Inst. 2008;15(4):292-296.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.292

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Abstract PDF: The electromagnetic (EM) wave absorption properties of the Fe_73Si_16B_7Nb_3Cu_1 nanocrystalline powder mixed with 5 to 20 vol% of Ni-Zn ferrites has been investigated in a frequency range from 100MHz to 10GHz. Amorphous ribbons prepared by a planar flow casting process were pulverized and milled after annealing at 425 for 1 hour. The powder was mixed with a ferrite powder at various volume ratios to tape-cast into a 1.0mm thick sheet. Results showed that the EM wave absorption sheet with Ni-Zn ferrite powder reduced complex permittivity due to low dielectric constant of ferrite compared with nanocrystalline powder, while that with 5 vol% of ferrite showed relatively higher imaginary part of permeability. The sheet mixed with 5 vol% ferrite powder showed the best electromagnetic wave absorption properties at high frequency ranges, which resulted from the increased imaginary part of permeability due to reduced eddy current.

Synthesis of Ni-based Bulk Metallic Glass Composites: Jin-Kyu Lee; J Korean Powder Metall Inst. 2008;15(4):297-301.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.297

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Abstract PDF: The Ni-based bulk metallic glass matrix composites were fabricated by spark plasma sintering of mixture of gas-atomized metallic glass powders and ductile brass powders. The successful consolidation of metallic glass matrix composite was achieved by strong bonding between metallic glass powders due to viscous flow deformation and lower stress of ductile brass powders in the supercooled liquid state during spark plasma sintering. The composite shows some macroscopic plasticity after yielding, which was obtained by introducing a ductile second brass phase in the Ni-based metallic glass matrix.

Sintering Behavior of Nano-sized Gd₂O₃-doped CeO₂ Powder Prepared by A High Energy Ball Milling: Sung-Soo Ryu, Hyung-Tae Kim; J Korean Powder Metall Inst. 2008;15(4):302-307.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.302

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Gd_2O_3-doped CeO_2(GDC) solid solutions have been considered as a promising materials for electrolytes in intermediate-temperature solid oxide fuel cells. In this study, the nano-sized GDC powder with average panicle size of 69nm was prepared by a high energy ball milling process and its sintering behavior was investigated. Heat-treatment at 1200°C of nano-sized GDC powder mixture led to GDC solid-solution. The enhanced densification over 96% of relative density was obtained after sintering at 1300°C for 2h. It was found that the sinterability of GDC powder could be significantly improved by the introduction of a high energy ball milling process.

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Synthesis of Nanocrystalline BaTiO3Powder by the Combination of High Energy Ball Milling of BaCO3-TiO2Mixture and Solid-State Reaction
Sung-Soo Ryu
Journal of Korean Powder Metallurgy Institute.2012; 19(4): 310. CrossRef

The Selective Leaching of Al-Ni Alloy Nano Powders Prepared by Electrical Wire Explosion: Je-Shin Park, Won-Baek Kim, Chang-Youl Suh, Han-Kwon Chang, Jong-Gwan Ahn, Byoung-Kyu Kim; J Korean Powder Metall Inst. 2008;15(4):308-313.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.308

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Abstract PDF: Al-Ni alloy nano powders have been produced by the electrical explosion of Ni-plated Al wire. The porous nano particles were prepared by leaching for Al-Ni alloy nano powders in 20wt% NaOH aqueous solution. The structural properties of leached porous nano powder were investigated by nitrogen physisorption, X-ray diffraction (XRD) and transmission Microscope (TEM). The surface areas of the leached powders were increased with amounts of AI in alloys. The pore size distributions of these powders were exhibited maxima at range of pore diameters 3.0 to 3.5 nm from the desorption isotherm. The maximum values of those were decreased with amounts of Al in alloys.

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.

Magnetic Powder and Nano-powder Composites for Electrical Converters: Marian Mazurkiewicz, Chang-Kyu Rhee, Bogumil Weglinski; J Korean Powder Metall Inst. 2008;15(4):320-330.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.320

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Abstract PDF: On the base of experience in development of Magnetic Powder Composites, and particularly Soft Magnetic Composites, authors are trying to systematize classification and indicate possible development prospective of Magnetic Nanocomposites (MN) technology and their applications in electrical converters. Clear classification and systematization, at an early stage of any materials and technology development, are essential and lead for better understanding and communication between researchers and industry involved. This concern MN as well and it seems to be the right time to make it at present stage of their development. Presented proposal of classification distinguishes various types of MN by their magnetic properties and area of possible applications. It is not a close set of types, and can be extended due to increase of knowledge concern these nanocomposites.

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