Journal of Powder Materials

Y.S. Kwon

5 Articles

Effect of Process-Control Agents on Characteristics of Amorphous Al-Y-Ni-Co Alloy Powder Produced by Mechanical Alloying: H.V. Nguyen, J.C. Kim, J.S. Kim, Y.J. Kwon, Y.S. Kwon; J Korean Powder Metall Inst. 2010;17(1):7-12.; DOI: https://doi.org/10.4150/KPMI.2010.17.1.007

17 View
0 Download

Abstract PDF: In this work, effect of various process-control agents (PCAs) on the mechanical alloying of amorphous alloy of Al_85Y_8Ni_5Co_2 has been investigated. The dependence of the particle shape, size and crystallization behavior of the amorphous alloy powders on the type of PCAs and their concentrations was investigated by using X-ray diffraction, field-emission scanning electron microscopy and differential scanning calorimetry. It was found that the additive of toluene could affect positively the amorphization and thermally induced crystallization processes, as well as the size refinement, morphology and particle-size distribution of as-milled powders in comparison with alloy obtained without PCA.

Production and Properties of Amorphous TiCuNi Powders by Mechanical Alloying and Spark Plasma Sintering: J.C. Kim, E.H. Kang, Y.S. Kwon, J.S. Kim, Si-Young Chang; J Korean Powder Metall Inst. 2010;17(1):36-43.; DOI: https://doi.org/10.4150/KPMI.2010.17.1.036

18 View
0 Download
1 Citations

In present work, amorphous TiCuNi powders were fabricated by mechanical alloying process. Amorphization and crystallization behaviors of the TiCuNi powders during high-energy ball milling and subsequent microstructure changes were studied by X-ray diffraction and transmission electron microscope. TEM samples were prepared by the focused ion beam technique. The morphology of powders prepared with different milling times was observed by field-emission scanning electron microscope and optical microscope. The powders developed a fine, layered, homogeneous structure with milling times. The crystallization behavior showed that glass transition, T_g, onset crystallization, T_x, and super cooled liquid range DeltaT=T_x-T_g were 628, 755 and 127K, respectively. The as-prepared amorphous TiCuNi powders were consolidated by spark plasma sintering process. Full densified TiCuNi samples were successfully produced by the spark plasma sintering process. Crystallization of the MA powders happened during sintering at 733K.

Citations

Citations to this article as recorded by

Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties
Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 235. CrossRef

Mechanical Properties of Bulk Amorphous Ti₅₀Cu₂₀Ni₂₀Al₁₀ Fabricated by High-energy Ball Milling and Spark-plasma Sintering: H.V. Nguyen, J.C. Kim, J.S. Kim, Y.J. Kwon, Y.S. Kwon; J Korean Powder Metall Inst. 2009;16(5):358-362.; DOI: https://doi.org/10.4150/KPMI.2009.16.5.358

19 View
0 Download

Abstract PDF: Ti_50Cu_20Ni_20Al_10 quaternary amorphous alloy was prepared by high-energy ball milling process. A complete amorphization was confirmed for the composition of Ti_50Cu_20Ni_20Al_10 after milling for 30hrs. Differential scanning calorimetry showed a large super-cooled liquid region (DeltaT_x = T_x T_g, T_g and T_x: glass transition and crystallization onset temperatures, respectively) of 80 K. Prepared amorphous powders of Ti_50Cu_20Ni_20Al_10 were consolidated by spark-plasma sintering. Densification behavior and microstructure changes were investigated. Samples sintered at higher temperature of 713 K had a nearly full density. With increasing the sintering temperature, the compressive strength increased to fracture strength of 756 MPa in the case of sintering at 733 K, which showed a 'transparticle' fracture. The samples sintered at above 693 K showed the elongation maximum above 2%.

Production and Properties of Ag Metallic Nanoparticle Fluid by Electrical Explosion of Wire in Liquid: E.J. Park, L.H. Bac, J.S. Kim, Y.S. Kwon, J.C. Kim, H.S. Choi, Y.H. Chung; J Korean Powder Metall Inst. 2009;16(3):217-222.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.217

39 View
0 Download
7 Citations

Abstract PDF

This paper presents a novel single-step method to prepare the Ag nanometallic particle dispersed fluid (nanofluid) by electrical explosion of wire in liquid, deionized water (DI water). X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) were used to investigate the characteristics of the Ag nanofluids. Zeta potential was also used to measure the dispersion properties of the as-prepared Ag nanofluid. Pure Ag phase was detected in the nanofluids using water. FE-SEM analysis shows that the size of the particles formed in DI water was about 88 nm and Zeta potential value was about -43.68 without any physical and chemical treatments. Thermal conductivity of the as-prepared Ag particle dispersed nanofluid shows much higher value than that of pure DI water.

Citations

Citations to this article as recorded by

Synthesis and Characterizations of Physical and Antibacterial Properties of the Ag Nanoparticles by Exploding of Wire Technique
Abdulkareem M. Hussain, Bilal K. Al-Rawi
International Journal of Nanoscience.2024;[Epub] CrossRef
Enhancing adsorption efficiency for environmentally-friendly removal of As(V) and Pb(II) using a biochar-iron oxide composite
Soo Hyeon Kim, Ji-In Park, Seungsoo Lee, Ha-Rim An, Hyeran Kim, Byoungchul Son, Jiwon Seo, ChangYeon Kim, Yesul Jeong, Kyuseok Choi, Seulki Jeong, Hyun Uk Lee
Applied Surface Science.2024; : 160348. CrossRef
The Impact of Particle Size and Surface Treatment of Zirconia Suspension for Photocuring Additive Manufacturing
Mee-Jin Jun, Jin-Ho Kang, Kumaresan Sakthiabirami, Seyed Aliakbar Hosseini Toopghara, Ye-Seul Kim, Kwi-Dug Yun, Sang-Won Park
Materials.2023; 16(4): 1670. CrossRef
Preparation and Characteristics of Fluorinated Carbon Nanotube Applied Capacitive Desalination Electrode with Low Energy Consumption
Hyun-woo Yoo, Ji-hyun Kang, Nam-soo Park, Tae-il Kim, Min-Il Kim, Young-Seak Lee
Applied Chemistry for Engineering.2016; 27(4): 386. CrossRef
Critical heat flux characteristics of nanofluids based on exfoliated graphite nanoplatelets (xGnPs)
Eun Ju Park, Sung Dae Park, In Cheol Bang, Young-Bin Park, Hyung Wook Park
Materials Letters.2012; 81: 193. CrossRef
Platinum nanoparticles reduce ovariectomy-induced bone loss by decreasing osteoclastogenesis
Woon-Ki Kim, Jin-Chun Kim, Hyun-Jung Park, Ok-Joo Sul, Mi-Hyun Lee, Ji-Soon Kim, Hye-Seon Choi
Experimental & Molecular Medicine.2012; 44(7): 432. CrossRef
Optimal synthesis and characterization of Ag nanofluids by electrical explosion of wires in liquids
Eun Ju Park, Seung Won Lee, In Cheol Bang, Hyung Wook Park
Nanoscale Research Letters.2011;[Epub] CrossRef

Fabrication of W-Cu Composite by Resistance Sintering under Ultrahigh Pressure: Y.S. Kwon, J.S. Kim, Z.J. Zhou; J Korean Powder Metall Inst. 2003;10(3):181-185.; DOI: https://doi.org/10.4150/KPMI.2003.10.3.181

13 View
0 Download

Abstract PDF: Resistance sintering under ultra-high pressure if developed to fabricate W-Cu composite containing 5 to 80v/o copper. The consolidation was carried out under pressure of 6 to 8 GPa and input power of 18 to 23 kW for 50 seconds. The densification effect and microstructure of these W-Cu composites are investigated. The effect of W particle size on ,sintering density was also studied. The micro hardness was measured to evaluate the sintering effect.

Author index