권호 표지

Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute

  • Bimonthly
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)

Aim & Scope

Journal of Korean Powder Metallurgy Institute is the official journal of the Korean Powder Metallurgy Institute (KPMI). The Journal of Korean Powder Metallurgy Institute publishes original articles, and reviews concerned with all aspects of powder metallurgy. The Journal of Korean Powder Metallurgy Institute covers the whole fields of powder materials and processes, which includes powder production (including their precursor materials), milling, granulation, cold and hot compaction, sintering, cold and hot isostatic pressing, pulsed and other assisted consolidation, additive manufacturing, injection molding, as well as coating technology using powder. The characterization, testing, quality assurance and applications are also covered. The Journal of Korean Powder Metallurgy Institute by bridging the gap between pure research and the more practical aspects of production and properties, will continue to provide a unifying medium for material scientists, technologists, engineers, designers and manufacturers. *TOPIC* Powder Materials - Fe-based powders - Non-ferrous powders - Ceramic powders - Particulate Composite - Tool/Cemented Carbides - Porous powders - Electric/Electronic powders - Bio materials - Magnetic powders - Energy conversion/storage powders - Multi-functional powders - Organic/inorganic powders Powder Technology - Powder synthesis - Powder characterization/analysis - Powder compaction - Powder pretreatment - Sintering - Densification process - PIM - Post-treatment - Novel powder technology - Nanostructured powders - Simulation of powder/process - Powder test - Powder business/industryPowder Technology

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Volume 18 Issue 2

  1. Lee, Byong-Pil;Kim, Myoung-Gyun;Choi, Bong-Jae;Kim, Young-Jig;Hyun, Seung-Keun 95
    https://doi.org/10.4150/KPMI.2011.18.2.095 PDF KSCI
  2. Ryu, Ho-Jin;Lee, Yong-Heui;Son, Kwang-Ug;Kong, Young-Min;Kim, Jin-Chun;Kim, Byoung-Kee;Yun, Jung-Yeul 105
    https://doi.org/10.4150/KPMI.2011.18.2.105 PDF KSCI
    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.
  3. Ryu, Ho-Jin;Lee, Yong-Heui;Son, Kwang-Ug;Kong, Young-Min;Kim, Jin-Chun;Kim, Byoung-Kee;Yun, Jung-Yeul 112
    https://doi.org/10.4150/KPMI.2011.18.2.112 PDF KSCI
    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.
  4. Choi, Sung-Hwan;Yun, Jung-Yeul;Lee, Hye-Mun;Kong, Young-Min;Kim, Byoung-Kee;Lee, Kee-Ahn 122
    https://doi.org/10.4150/KPMI.2011.18.2.122 PDF KSCI
    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 $900^{\circ}C$, $1000^{\circ}C$ and $1100^{\circ}C$. 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.
  5. Kim, Jin-Sil;Rhym, Young-Mok;Shim, Sang-Eun 129
    https://doi.org/10.4150/KPMI.2011.18.2.129 PDF KSCI
    Herein, macroporous carbon materials were readily prepared by carbonization of cured body of resorcinol and formaldehyde using poly(methyl methacrylate) colloid microspheres which were employed as the template in the gelation of resorcinol with formaldehyde. The gel in the water was solvent exchanged with methanol and the wet gel was dried. After carbonization of the template-gel composite at $800^{\circ}C$, it was found that pores were left corresponding to the size of the template, yielding carbon materials with a fine porous structure with enlarged surface area and significant porosity. Properties of the carbon foams including the structure, morphology, thermal stability, and porosity were investigated. Finally, it was concluded that the method using polymer colloids as the template provided a facile route to prepare carbon foams.
  6. Bang, Jae-Oh;Lee, Hyo-Soo;Jung, Taek-Kyun;Lee, Min-Ha;Kim, Bum-Sung;Jung, Seung-Boo 135
    https://doi.org/10.4150/KPMI.2011.18.2.135 PDF KSCI
    The RFID (Radio-Frequency Identification) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. Some RFID tags have been used in severe environment of temperature ranged from $200^{\circ}C$ to $250^{\circ}C$ for a long time and may cause serious problems such as signal error, short life cycle and explosion. Conventionally, the RFID tags for high temperature applications consisted of Fe-alloy housing part, ceramic powder and RFID sensor. However, it has disadvantage of heavy weight, signal noise and heat shield capability. In this study, we newly applied the aluminum porous materials fabricated by polymer leaching process into RFID tags in order to improve heat shielding ability, and compared the properties of RFID tag inserted by aluminum porous with the conventional one.
  7. Ji, Chang-Wook;Yi, Eun-Ju;Kim, Yang-Do;Rhyim, Young-Mok 141
    https://doi.org/10.4150/KPMI.2011.18.2.141 PDF KSCI
    Carbon material shows relatively high strength at high temperature in vacuum atmosphere and can be easily removed as CO or $CO_2$ gas in oxidation atmosphere. Using these characteristics, we have investigated the applicability of carbon mold for precision casting of high melting point metal such as nickel. Disc shape carbon mold with cylindrical pores was prepared and Ni-base super alloy (CM247LC) was used as casting material. The effects of electroless Nickel plating on wettability and cast parameters such as temperature and pressure on castability were investigated. Furthermore, the proper condition for removal of carbon mold by evaporation in oxidation atmosphere was also examined. The SEM observation of the interface between carbon mold and casting materials (CM247LC), which was infiltrated at temperature up to $1600^{\circ}C$, revealed that there was no particular product at the interface. Carbon mold was effectively eliminated by exposure in oxygen rich atmosphere at $705^{\circ}C$ for 3 hours and oxidation of casting materials was restrained during raising and lowering the temperature by using inert gas. It means that the carbon can be applicable to precision casting as mold material.
  8. Cho, J.Y.;Song, G.A.;Lee, M.H.;Lee, H.S.;Lee, W.H.;Kim, K.B. 149
    https://doi.org/10.4150/KPMI.2011.18.2.149 PDF KSCI
    Electro-Discharge Sintering (EDS) employs a high-voltage/high-current-density pulse of electrical energy, discharged from a capacitor bank, to instantaneously consolidate powders. In the present study, a single pulse of 0.57-1.1 kJ/0.45 g-atomized spherical $Ti_{52}Zr_{28}Ni_{20}$ powders in size range of 10~30 and $30\sim50{\mu}m$ consisting of ${\beta}$-(Ti, Zr) and icosahedral phases were applied to examine the structural evolution of icosahedral phase during EDS. Structural investigation reveals that high electrical input energy facilitates complete decomposition of icosahedral phase into C14 laves and ${\beta}$-(Ti, Zr) phases. Moreover, critical input energy inducing decomposition of the icosahedral phase during EDS depends on the size of the powder. Porous Ti and W compacts have been fabricated by EDS using rectangular and spherical powders upon various input energy at a constant capacitance of $450{\mu}F$ in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated heat (${\Delta}H$) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.
  9. Choi, Hee-Lack;Yu, Chang-Yong;Ha, Heon-Phil 159
    https://doi.org/10.4150/KPMI.2011.18.2.159 PDF KSCI
    The influence of sulfate on the selective catalytic reduction of $NO_x$ on the Ag/$Al_2O_3$ catalyst was studied when $CH_4$ was used as a reducing agent. Various preparation methods influenced differently on the $deNO_x$ activity. Among the methods, cogelation precipitation gave best activity. When sulfates were formed on the surfaces of samples prepared by impregnated and deposition precipitation, $deNO_x$ activity was enhanced as long as suitable forming condition is satisfied. The major sulfate formed in Ag/$Al_2O_3$ catalyst was the aluminum sulfate and it seems that this sulfate acted as a promoter. When Mg was added to the Ag/$Al_2O_3$ catalyst it promoted $deNO_x$ activity at high temperature. Intentionally added sulfate also enhanced $deNO_x$ activity, when their amount was confined less than 3 wt%.
  10. Kim, Dong-Uk;Cha, Pil-Ryung 168
    https://doi.org/10.4150/KPMI.2011.18.2.168 PDF KSCI
    We investigate grain growth behavior of poly-crystalline Mg sheet having strong basal fiber texture using phase field model for grain growth and micro-elasticity. Strong initial basal texture was maintained when external load was not imposed, but was weaken when external biaxial strain was imposed. Elastic interaction between elastic anisotropy of Mg grain and external load is the reason why texture evolution occurs.
  11. Kim, Dong-Uk;Byun, Ji-Young;Cha, Pil-Ryung 172
    https://doi.org/10.4150/KPMI.2011.18.2.172 PDF KSCI
    We developed a 3D simulation model of microstructure evolution of vertically aligned porous structure due to phase separation during film growth. The model proves its validity by reproducing the results of previous researches which are topological features of the microstructures and effects of varied processing parameters. The model will be extended by including bulk diffusion effect and elastic effect.
  12. Lebedev, S.M.;Gefle, O.S.;Semenikhin, M.V. 176
    https://doi.org/10.4150/KPMI.2011.18.2.176 PDF KSCI
    Study of the main properties of PVDF films produced by two processing technologies such as hot pressing from a melt or solution casting was the aim of this paper. All samples were prepared of as-received PVDF powder. First group of samples was prepared by the hot pressing. Second group of samples was prepared by the solution casting method. PVDF powder was dissolved in dimethylformamide. To characterize properties of samples, different experimental methods such as FRA (dielectric spectroscopy), IR-spectroscopy and DSC/TGA analysis were used in this work. It was found that IR-spectra of both studied groups do not change compared to that for virgin PVDF powder. It confirms that molecular structure is practically independent on the processing technology of samples. The only difference has been found that new band centered at $1723\;cm^{-1}$ appears for samples prepared by the hot pressing method. This absorption band is related with formation of C=C bonds in samples prepared by the hot pressing method in contrast both to PVDF powder and samples prepared by the solution casting method.
  13. Lebedev, S.M.;Gefle, O.S.;Semenikhin, M.V. 181
    https://doi.org/10.4150/KPMI.2011.18.2.181 PDF KSCI
    PVDF was used as a polymeric matrix material in this work. Nickel powders with average particles size of 200 nm or 72 nm were used as fillers. PVDF/metal submicro- and nanocomposites were prepared by means of a mixing in twin screw extruder and planetary ball mill, respectively. All samples were prepared by hot pressing method. Their electrical, thermal and morphological properties were examined by dielectric spectroscopy, DSC, FTIR, XRD, optical microscopy and scanning electron microscopy. It was found that all properties of composites were strongly modified depending on the content of metal powders and filler particles size. Particularly, specific volume resistivity of PVDF/Ni composite with 0.2 wt.% of Ni was increased by factor of 1.5~4.
  14. Woo, Kee-Do;Kang, Duck-Soo;Kim, Sang-Hyuk;Park, Sang-Hoon;Kim, Ji-Young;Ko, Hye-Rim 188
    https://doi.org/10.4150/KPMI.2011.18.2.188 PDF KSCI
    The aim of this study was to investigate microstructures and mechanical properties of nano-sized Ti-35 wt.%Nb-7 wt.%Zr-10 wt.%CPP composite fabricated by high energy mechanical milling (HEMM) and pulse current activated sintering (PCAS). Grain growth of the mechanically milled powder was prevented by performing PCAS. The principal advantages of calcium phosphate materials include: similarity in composition to the bone mineral, bioactivity, osteoconductivity and ability to form a uniquely strong interface with bone. The hardness and wear resistance property of nano-sized Ti-35 wt.%Nb-7 wt.%Zr-10 wt.%CPP composites increased with increasing milling time because of decreased grain-size of sintered composites.
  15. Hong, Hyun-Seon;Ko, Young-Dae;Kang, Lee-Seung;Jung, Hang-Chul;Kim, Geon-Hong 196
    https://doi.org/10.4150/KPMI.2011.18.2.196 PDF KSCI