Journal of Powder Materials

Chang-Youl Suh

5 Articles

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

124 View
0 Download

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.

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

150 View
0 Download
2 Citations

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).

Citations

Citations to this article as recorded by

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

Ag-Cu Powders Prepared by Electrical Wire Explosion of Cu-plated Ag Wires: Won-Baek Kim, Je-Shin Park, Chang-Youl Suh; J Korean Powder Metall Inst. 2007;14(5):320-326.; DOI: https://doi.org/10.4150/KPMI.2007.14.5.320

123 View
1 Download

Abstract PDF: Ag-Cu alloy nano powders were fabricated by the electrical explosion of Cu-plated Ag wires. Ag wires of 0.2mm diameter was electroplated to final diameter of 0.220 mm and 0.307 mm which correspond to Ag-27Cu and Ag-68Cu alloy. The explosion product consisted of equilibrium phases of alpha-Ag and beta-Cu. The particle size of Ag-Cu nano powders were 44 nm and 70 nm for 0.220 mm and 0.307 mm wires, respectively. The Ag-Cu nano powders contained less Cu than average value due to higher sublimation energy compared to that of Ag. As a result, micron-sized spherical particles formed from liquid droplets contained higher Cu content.

Cu-Ni-P Alloy Nano Powders Prepared by Electrical Wire Explosion: Won-Baek Kim, Je-Shin Park, Chang-Youl Suh, Jae-Chun Lee, Jung-Hwan Kim, Yong-Jun Oh; J Korean Powder Metall Inst. 2007;14(2):108-115.; DOI: https://doi.org/10.4150/KPMI.2007.14.2.108

207 View
0 Download
1 Citations

Abstract PDF

Cu-Ni-P alloy nano powders were fabricated by the electrical explosion of electroless Ni plated Cu wires. The effect of applied voltage on the explosion was examined by applying pulse voltage of 6 and 28 kV, The estimated overheating factor, K, were 1.3 for 6 kV and 2.2 for 28 kV. The powders produced with pulse voltage of 6 kV were composed of Cu-rich solid solution, Ni-rich solid solution, and Ni_3P phase. While, those produced with 28 kV were complete Cu-Ni-P solid solution and small amount of Ni_3P phase. The initial P content of 6.5 at.% was reduced to 2-3 at.% during explosion due to its high vapour pressure.

Citations

Citations to this article as recorded by

In-Situ Characterization of Metal Nanopowders Manufactured by the Wire Electrical Explosion Process
Seung-Bok Lee, Jae Hee Jung, Gwi-Nam Bae, Dong-Jin Lee
Aerosol Science and Technology.2010; 44(12): 1131. CrossRef

Metal Nano Powders as a New Getter Material: Won-Baek Kim, Je-Shin Park, Chang-Youl Suh, Han-Kwon Chang, Jae-Chun Lee, Mi-Young Park; J Korean Powder Metall Inst. 2007;14(1):56-62.; DOI: https://doi.org/10.4150/KPMI.2007.14.1.056

124 View
0 Download

Abstract PDF: Getter property of nano-sized metallic powders was evaluated as a possible candidate for the future getter material. For the purpose, Ti powders of about 50 nm were prepared by electrical wire explosion. Commercial Ti powders of about 22 micrometer were tested as well for comparison. The room-temperature hydrogen-sorption speed of nano-sized Ti powders was 1.34;L/seccdotcm2 which was more than 4 times higher than that of micron-sized ones. The value is comparable to or even higher than those of commercial products. Its sorption speed increases with activation temperature up to 500°C above which it deteriorates due to low-temperature sintering effect of nano-sized particles.

Author index