Journal of Powder Materials

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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; J Korean Powder Metall Inst. 2014;21(1):55-61. Published online February 1, 2014; DOI: https://doi.org/10.4150/KPMI.2014.21.1.55

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Fe-Cr-Al powder porous metal was manufactured by using new electro-spray process. First, ultra-fine fecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid (0.05~0.5% powders) was dispersed on Polyurethane foam through the electro-spray process. And then degreasing and sintering processes were conduced. In order to examine the effect of cell size (200 μm, 450 μm, 500 μm) in process, pre-samples were sintered for two hours at temperature of 1450°C, in H₂ atmospheres. A 24-hour thermo gravimetric analysis test was conducted at 1000°C in a 79% N₂ + 21% O₂ to investigate the high temperature oxidation behavior of powder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased with increasing cell size. In the 200 μm porous metal with a thinner strut and larger specific surface area, the depletion of the stabilizing elements such as Al and Cr occurred more quickly during the high-temperature oxidation compared with the 450, 500 μm porous metals.

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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
Microstructure and High Temperature Oxidation Behaviors of Fe-Ni Alloys by Spark Plasma Sintering
Chae Hong Lim, Jong Seok Park, Sangsun Yang, Jung-Yeul Yun, Jin Kyu Lee
Journal of Korean Powder Metallurgy Institute.2017; 24(1): 53. CrossRef
Effect of Al2O3 Inter-Layer Grown on FeCrAl Alloy Foam to Improve the Dispersion and Stability of NiO Catalysts
유진 이, 본율 구, 성호 백, 만호 박, 효진 안
Korean Journal of Materials Research.2015; 25(8): 391~397. CrossRef

Electrochemical Properties for the Corrosion of Zinc Anode with Different Particle Size and Shape in Zinc/air Batteries: Won-Geun Yang, Jung-Eui Hong, Rye-Gyeong Oh, Ji-Woo Oh, Young-Min Kong, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2013;20(3):186-190.; DOI: https://doi.org/10.4150/KPMI.2013.20.3.186

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The electrochemical performance for the corrosion of zinc anodes according to particle size and shape as anode in Zn/air batteries was study. We prepared five samples of Zn powder with different particle size and morphology. For analysis the particle size of theme, we measured particle size analysis (PSA). As the result, sample (e) had smaller particle size with 10.334µm than others. For measuring the electrochemical performance of them, we measured the cyclic voltammetry and linear polarization in three electrode system (half-cell). For measuring the morphology change of them before and after cyclic voltammetry, we measured Field Emission Scanning Electron Microscope (FE-SEM). From the cyclic voltammetry, as the zinc powder had small size, we knew that it had large diffusion coefficient. From the linear polarization, as the zinc powder had small size, it was a good state with high polarization resistance as anode in Zn/air batteries. From the SEM images, the particle size had increased due to the dendrite formation after cyclic voltammetry. Therefore, the sample (e) with small size would have the best electrochemical performance between these samples.

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Spheroidization of Pure-vanadium Powder using Radio Frequency Thermal Plasma Process
Nana Kwabena Adomako, Seungmin Yang, Min Gyu Lee, N. S. Reddy, Jeoung-Han Kim
Journal of Korean Powder Metallurgy Institute.2019; 26(4): 305. CrossRef
Effects of Powder Shape and Densification Mechanism on the Microstructures and Mechanical Properties of Ti-6Al-4V Components
Youngmoo Kim, Young-Sam Kwon, Young-Beom Song, Sung Ho Lee
Journal of Korean Powder Metallurgy Institute.2019; 26(4): 311. 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; J Korean Powder Metall Inst. 2012;19(6):435-441.; DOI: https://doi.org/10.4150/KPMI.2012.19.6.435

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A new manufacturing process of Fe-Cr-Al powder porous metal was attempted. First, ultra-fine fecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid (0.05~0.5% powders) was dispersed on PU (Polyurethane) foam through the electrospray process. And then degreasing and sintering processes were conduced. In order to examine the effect of sintering temperature in process, pre-samples were sintered for two hours at temperatures of 1350°C, 1400°C, 1450°C, and 1500°C, respectively, in H_2 atmospheres. A 24-hour TGA (thermo gravimetric analysis) test was conducted at 1000°C in a 79% N_2+21% O_2 to investigate the high temperature oxidation behavior of powder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased with increasing sintering temperature (2.57% oxidation weight gain at 1500°C sintered specimen). The high temperature oxidation mechanism of newly manufactured Fe-Cr-Al powder porous metal was also discussed.

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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

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; J Korean Powder Metall Inst. 2011;18(2):122-128.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.122

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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°C, 1000°C and 1100°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.

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Effect of Strut Thickness on Room and High Temperature Compressive Properties of Block-Type Ni-Cr-Al Powder Porous Metals
B.-H. Kang, M.-H. Park, K.-A. Lee
Archives of Metallurgy and Materials.2017; 62(2): 1329. CrossRef
Fabrication of metallic alloy powder (Ni3Fe) from Fe–77Ni scrap
Inseok Seo, Shun-Myung Shin, Sang-An Ha, Jei-Pil Wang
Journal of Alloys and Compounds.2016; 670: 356. CrossRef
Preparation of oxide powder by continuous oxidation process from recycled Fe-77Ni alloy scrap
J Y Yun, D H Park, G J Jung, J P Wang
IOP Conference Series: Materials Science and Engineering.2015; 103: 012026. CrossRef
Reduction of High Nickel-Based Oxide Particles Using Hydrogen Gas
Sung Ho Joo, Shun Myung Shin, Dong Ju Shin, Jei Pil Wang
Applied Mechanics and Materials.2015; 778: 148. CrossRef
Fabrication of oxide powder from Fe–46Ni alloy scrap
J.-Y. Yun, D.-W. Lee, S.-M. Shin, J.-P. Wang
Materials Research Innovations.2015; 19(sup5): S5-415. CrossRef
Evaluation of Creep Reliability of Powder Metallurgy and Cast-type Ni-based Superalloy by Using Ultrasonic Wave
Chan-Yang Choi, Jin-Hun Song, Se-Ung Oh, Chung-Seok Kim, Sook-In Kwun, Sung-Tag Oh, Chang-Yong Hyun, Jai-Won Byeon
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 215. 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

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; J Korean Powder Metall Inst. 2011;18(2):112-121.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.112

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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.

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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

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; J Korean Powder Metall Inst. 2011;18(2):105-111.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.105

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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.

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Fabrication of Fe3O4/Fe/Graphene nanocomposite powder by Electrical Wire Explosion in Liquid Media and its Electrochemical Properties
Yoo-Young Kim, Ji-Seub Choi, Hoi-Jin Lee, Kwon-Koo Cho
Journal of Korean Powder Metallurgy Institute.2017; 24(4): 308. 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 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

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