- Fabrication and Characterization of Carbon-Coated Cu Nanopowders by Pulsed Wire Evaporation Method
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H.M. Lee, J.H. Park, S.M. Hong, Y.R. Uhm, C.K. Rhee
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J Korean Powder Metall Inst. 2009;16(4):243-248.
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DOI: https://doi.org/10.4150/KPMI.2009.16.4.243
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- Carbon-coated Cu nanopowders with core/shell structure have been successfully fabricated by pulsed wire evaporation (PWE) method, in which a mixed gas of Ar/CH_4 (10 vol.%) was used as an ambient gas. The characterization of the samples was carried out using x-ray diffraction (XRD), scanning electron microscope (SEM), and high resolution transmission electron microscope (HRTEM). It was found that the nanoparticles show a spherical morphology with the size ranging of 10-40 nm and are covered with graphite layers of 2-4 nm. When oxygen-passivated Cu nanopowders were annealed under flowing argon gas (600 and 800°C), the crystallinity of Cu_2O phase and the particle size gradually increased. On the other hand, carbon-coated Cu nanopowders remained similar to as-prepared case with no additional oxide or carbide phases even after the annealing, indicating that the metal nanoparticles are well protected by the carbon-coating layers.
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Citations
Citations to this article as recorded by  - Improved oxidation stability of carbon-coated Ni nanoparticles synthesized by one-step electrical wire explosion
Jun-Hyeok Lee, Byung-Hoon Kim, Gyoung-Ja Lee
Materials Chemistry and Physics.2022; 276: 125410. 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 - A Study on Thermal Properties of Ethylene Glycol Containing Copper Oxide Nanoparticles
Chang-Kyu Kim, Gyoung-Ja Lee, Chang-Kyu Rhee
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 276. CrossRef - Synthesis and Characterization of Cu Nanofluid Prepared by Pulsed Wire Evaporation Method
Chang-Kyu Kim, Gyoung-Ja Lee, Chang-Kyu Rhee
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 270. CrossRef - Synthesis of Core/shell Structured Ag/C Nano Particles and Properties on Annealing Conditions
S.H. Jun, Y.R. Uhm, C.K. Rhee
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 295. CrossRef - Synthesis and Characterization of Glold Nanofluid Prepared by the Solution Plasma Processing
Yong-Kang Heo, Sang-Yul Lee
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 342. CrossRef
- An Investigation of Dispersion Behavior of Y2O3 Ceramic Particles in Hypo, Eutectic and Hyper Binary Al-Cu Cast Alloys
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J.J. Park, G.H. Kim, S.M. Hong, S.H. Lee, M.K. Lee, C.K. Rhee
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J Korean Powder Metall Inst. 2007;14(2):123-126.
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DOI: https://doi.org/10.4150/KPMI.2007.14.2.123
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Abstract
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- In this work, the dispersion behavior of Y_2O_3 particles in binary aluminum (Al)-copper (Cu) cast alloy was investigated with respect to Cu contents of 20 (hypoeutertic), 33 (eutectic) and 40 (hypereutectic) wt.%. In cases of hypo and hypereutectic compositions, SEM images revealed that the primary Al and theta phases were grown up at the beginning, respectively, and thereafter the eutectic phase was solidified. In addition, it was found that some of Y_2O_3 particles can be dispersed into the primary Al phase, but none of them are is observed inside the primary 6 phase. This different dispersion behavior of Y_2O_3 particles is probably due to the difference in the val- ues of specific gravity between Y_2O_3 particles and primary phases. At eutectic composition, Y_2O_3 particles were well dispersed in the matrix since there is few primary phases acting as an impediment site for particle dispersion during solidification. Based on the experimental results, it is concluded that Y_2O_3 particles are mostly dispersed into the eutectic phase in binary Al-Cu alloy system.
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