- Dispersion Behaviors of Y2O3 Particles Into Aisi 316L Stainless Steel by Using Laser Cladding Technology
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Eun-Kwang Park, Sung-Mo Hong, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Kyeong-Won Seol, Yang-Kyu Lee
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J Powder Mater. 2013;20(4):269-274.
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DOI: https://doi.org/10.4150/KPMI.2013.20.4.269
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- The present work investigated the dispersion behavior of Y_2O_3 particles into AISI 316L SS manufactured using laser cladding technology. The starting particles were produced by high energy ball milling in 10 min for prealloying, which has a trapping effect and homogeneous dispersion of Y_2O_3 particles, followed by laser cladding using CO_2 laser source. The phase and crystal structures of the cladded alloys were examined by XRD, and the cross section was characterized using SEM. The detailed microstructure was also studied through FE-TEM. The results clearly indicated that as the amount of Y_2O_3 increased, micro-sized defects consisted of coarse Y_2O_3 were increased. It was also revealed that homogeneously distributed spherical precipitates were amorphous silicon oxides containing yttrium. This study represents much to a new technology for the manufacture and maintenance of ODS alloys.
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Citations
Citations to this article as recorded by  - Flexible Post-Process Machining of the Directed Energy Deposition (DED) Printed Part through the On-Machine Measurement
Hoon-Hee Lee, Min-Suk Park, Dong-Mok Lee, Seung-Han Yang
Journal of the Korean Society for Precision Engineering.2020; 37(12): 881. CrossRef - Microstructure and Room Temperature Wear Properties of a Ni-Cr-B-Si-C Coating Layer Manufactured by the Laser Cladding Process
Tae-Hoon Kang, Kyu-Sik Kim, Soon-Hong Park, Kee-Ahn Lee
Korean Journal of Metals and Materials.2018; 56(6): 423. CrossRef - Manufacturing of Ni-Cr-B-Si + WC/12Co Composite Coating Layer Using Laser Cladding Process and its Mechanical Properties
Gi-Su Ham, Chul-O Kim, Soon-Hong Park, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2017; 24(5): 370. CrossRef
- An Investigation of the Stability of Y2O3 and Sintering Behavior of Fe-Based ODS Particles Prepared by High Energy Ball Milling
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Eun-Kwang Park, Sung-Mo Hong, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Kyeong-Won Seol
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J Powder Mater. 2013;20(4):275-279.
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DOI: https://doi.org/10.4150/KPMI.2013.20.4.275
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- Fe-based oxide dispersion strengthened (ODS) powders were produced by high energy ball milling, followed by spark plasma sintering (SPS) for consolidation. The mixed powders of 84Fe-14Cr-2Y_2O_3 (wt%) were mechanically milled for 10 and 90 mins, and then consolidated at different temperatures (900sim1100°C). Mechanically-Alloyed (MAed) particles were examined by means of cross-sectional images using scanning electron microscopy (SEM). Both mechanical alloying and sintering behavior was investigated by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM). To confirm the thermal behavior of Y_2O_3, a replica method was applied after the SPS process. From the SEM observation, MAed powders milled for 10 min showed a lamella structure consisting of rich regions of Fe and Cr, while both regions were fully alloyed after 90 min. The results of sintering behavior clearly indicate that as the SPS temperature increased, micro-sized defects decreased and the density of consolidated ODS alloys increased. TEM images revealed that precipitates smaller than 50 nm consisted of YCrO_3.
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Citations
Citations to this article as recorded by - Effect of Y2O3 on Mechanical and Corrosion Properties of Fe and Fe-Ni Alloys Prepared by Mechanical Alloying Followed by Spark Plasma Sintering
Arpan Arora, Atul Kumar, Suhrit Mula
Journal of Materials Engineering and Performance.2021; 30(2): 1387. CrossRef - Synthesis and Microstructure of Fe-Base Superalloy Powders with Y-Oxide Dispersion by High Energy Ball Milling
다미 임, 종관 박, 승탁 오
Korean Journal of Materials Research.2015; 25(8): 386~390. CrossRef
- Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
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Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
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J Powder Mater. 2013;20(3):215-220.
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DOI: https://doi.org/10.4150/KPMI.2013.20.3.215
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- In the present work, 6061 Al-B_4C sintered composites containing different B_4C contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with B_4C various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to 660°C. Above sintering temperature of 640°C, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-B_4C composite material was lowered with increasing B_4C content, resulting in the decrease in its real density and at the same time in the increment of porosity.
- A Study on Voltammetry System Design for Realizing High Sensitivity Nano-Labeled Sensor of Detecting Heavy Metals
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Ju-Myoung Kim, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2012;19(4):297-303.
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DOI: https://doi.org/10.4150/KPMI.2012.19.4.297
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- In this study, voltammetry system for realizing high sensitivity nano-labeled sensor of detecting heavy metals was designed, and optimal system operating conditions were determined. High precision digital to analog converter (DAC) circuit was designed to control applied unit voltage at working electrode and analog to digital converter (ADC) circuit was designed to measure the current range of 0.1sim1000µA at counter electrode. Main control unit (MCU) circuit for controlling voltammetry system with 150 MHz clock speed, main memory circuit for the mathematical operation processing of the measured current value and independent power circuit for analog/digital circuit parts to reduce various noise were designed. From result of voltammetry system operation, oxidation current peaks which are proportional to the concentrations of Zn, Cd and Pb ions were found at each oxidation potential with high precision.
- Milling Behaviors of Al-B4C Composite Powders Fabricated by Mechanical Milling Process
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Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Min-Ku Lee, Chang-Kyu Rhee, Ju-Myoung Kim, Jin-Kyu Lee
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J Korean Powder Metall Inst. 2012;19(4):291-296.
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DOI: https://doi.org/10.4150/KPMI.2012.19.4.291
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- In the present work, Al-B_4C composite powders were fabricated using a mechanical milling process and its milling behaviors and mechanical properties as functions of B_4C sizes ( 100µm, 500 nm and 50 nm) and concentrations (1, 3 and 10 wt.%) were investigated. For achieving it, composite powders and their compacts were fabricated using a planetary ball mill machine and magnetic pulse compaction technology. Al-B_4C composite powders represent the most uniform dispersion at a milling speed of 200 rpm and a milling time of 240 minutes. Also, the smaller B_4C particles were presented, the more excellent compositing characteristics are exhibited. In particular, in the case of the 50 nm B_4C added compact, it showed the highest values of compaction density and hardness compared with the conditions of 100µm and 500 nm additions, leading to the enhancement its mechanical properties.
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Citations
Citations to this article as recorded by - Influence of high B4C contents on structural evolution of Al-B4C nanocomposite powders produced by high energy ball milling
Hao Guo, Yu Zhao, Songsong Xu, Junpeng Li, Naimeng Liu, Yang Zhang, Zhongwu Zhang
Ceramics International.2019; 45(5): 5436. CrossRef - Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(3): 215. CrossRef
- Quantitative Study on the Refinement Behaviors of TiC Powders Produced by Mechanical Milling Under Different Impact Energy
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Sung-Mo Hong, Eun-Kwang Park, Kyeong-Yeol Kim, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Jin-Kyu Lee, Young-Soon Kwon
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J Korean Powder Metall Inst. 2012;19(1):32-39.
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DOI: https://doi.org/10.4150/KPMI.2012.19.1.032
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- This study investigated refinement behaviors of TiC powders produced under different impact energy conditions using a mechanical milling process. The initial coarse TiC powders with an average diameter of 9.3 µm were milled for 5, 20, 60 and 120 mins through the conventional low energy mechanical milling (LEMM, 22G) and specially designed high energy mechanical milling (HEMM, 65G). TiC powders with angular shape became spherical one and their sizes decreased as the milling time increased, irrespective of milling energy. Based upon the FE-SEM and BET results of milled powders, it was found initial coarse TiC powders readily became much finer near 100 nm within 60 min under HEMM, while their sizes were over 200 nm under LEMM, despite the long milling time of up to 120 min. Particularly, ultra-fine TiC powders with an average diameter of 77 nm were fabricated within 60 min in the presence of toluene under HEMM.
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Citations
Citations to this article as recorded by - Compaction and Sintering Characteristics of High Energy Ball Milled Mn-Zn Ferrite Powders
Hyunseung Lee, Hoseong Rhee, Sangsoo Lee, Si Young Chang
Korean Journal of Materials Research.2021; 31(12): 677. CrossRef - Fabrication of titanium carbide nano-powders by a very high speed planetary ball milling with a help of process control agents
Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Kyeong-Youl Kim, Jung-Gu Lee, Min-Ku Lee, Chang-Kyu Rhee, Jin Kyu Lee
Powder Technology.2015; 274: 393. CrossRef - Control of Y2O3 phase and its nanostructure formation through a very high energy mechanical milling
M.K. Lee, E.K. Park, J.J. Park, C.K. Rhee
Journal of Solid State Chemistry.2013; 201: 56. CrossRef - Fabrication of Fe coated Mg Based Desulfurization Powder by Mechanical Alloying Process
Joon-Woo Song, Otaduy Guillermo, Byong-Sun Chun, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 226. CrossRef - Synthesis and structural properties of Ni–20Cr–2Y2O3 nanocomposite alloy prepared by a very high energy mechanical milling
M.K. Lee, J.J. Park, C.K. Rhee
Materials Chemistry and Physics.2012; 137(1): 129. CrossRef
- Size Control of Bismuth Nanoparticles by Changes in Carrier-Gas Flow Rate and Chamber Pressure of Gas Condensation Apparatus
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Gyoung-Ja Lee, Chang-Kyu Kim, Min-Ku Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2010;17(5):379-384.
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DOI: https://doi.org/10.4150/KPMI.2010.17.5.379
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- In the present work, bismuth nanopowders with various particle size distributions were synthesized by controlling argon (Ar) gas flow rate and chamber pressure of a gas condensation (GC) apparatus. From the analyses of transmission electron microscopy (TEM) images and nitrogen gas adsorption results, it was found that as Ar gas flow rate increased, the specific surface area of bismuth increased and the average particles size decreased. On the other hand, as the chamber pressure increased, the specific surface area of bismuth decreased and the average particles size increased. The optimum gas flow rate and chamber pressure for the maximized electrochemical active surface area were determined to be 8 L/min and 50 torr, respectively. The bismuth nanopowders synthesized at the above condition exhibit 13.47 m2g-1 of specific surface area and 45.6 nm of average particles diameter.
- Synthesis and Characterization of Cu Nanofluid Prepared by Pulsed Wire Evaporation Method
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Chang-Kyu Kim, Gyoung-Ja Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2010;17(4):270-275.
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DOI: https://doi.org/10.4150/KPMI.2010.17.4.270
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- Ethylene glycol-based Cu nanofluids were prepared by pulsed wire evaporation (PWE) method. The structural properties of Cu nanoparticles were studied by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The average diameter and Brunauer Emmett Teller (BET) surface area of Cu nanoparticles were about 100 nm and 7.46;m2/g, respectively. The thermal conductivity and viscosity of copper nanofluid were measured as functions of Cu concentration and temperature. As the volume fraction of Cu nanoparticles increased, both the enhanced ratios of thermal conductivity and viscosity of Cu nanofluids increased. As the temperature increased, the enhanced ratio of thermal conductivity increased, but that ratio of viscosity decreased.
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Citations
Citations to this article as recorded by - Characterization of Classification of Synthesized Ni Nanopowders by Pulsed Wire Evaporation Method
Joong-Hark Park, Geon-Hong Kim, Dong-Jin Lee, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2017; 24(5): 389. CrossRef - Effect of Electrical Parameters and Surrounding Gas on the Electroexplosive Tungsten Nanopowders Characteristics
Young-Soon Kwon, Jin-Chun Kim, Alexander P. Ilyin, Olga B. Nazarenko, Dmitry V. Tikhonov
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 49. CrossRef - Thermal conductivity enhancement of ZnO nanofluid using a one-step physical method
Gyoung-Ja Lee, Chang Kyu Kim, Min Ku Lee, Chang Kyu Rhee, Seokwon Kim, Chongyoup Kim
Thermochimica Acta.2012; 542: 24. CrossRef
- A Study on Thermal Properties of Ethylene Glycol Containing Copper Oxide Nanoparticles
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Chang-Kyu Kim, Gyoung-Ja Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2010;17(4):276-280.
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DOI: https://doi.org/10.4150/KPMI.2010.17.4.276
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22
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- In the present work, ethylene glycol-based (EG) copper oxide nanofluids were synthesized by pulsed wire evaporation method. In order to explode the pure copper wire, high voltage of 23 kV was applied to the both ends of wire and argon/oxygen gas mixture was used as reactant gas. EG-based copper oxide nanofluids with different volume fraction were prepared by controlling explosion number of copper wire. From the transmission electron microscope (TEM) image, it was found that the copper oxide nanoparticles exhibited an average diameter about 100 nm with the oxide layer of 2~3 nm. The synthesized copper oxide consists of CuO/Cu_2O phases and the Brunauer Emmett Teller (BET) surface area was estimated to be 6.86;m2;g-1. From the analyses of thermal properties, it is suggested that viscosity and thermal conductivity of EG-based copper oxide nanofluids do not show temperature-dependent behavior over the range of 20 to 90°C. On the other hand, the viscosity and thermal conductivity of EG-based copper oxide nanofluids increase with volume fraction due to the active Brownian motion of the nanoparticles, i.e., nanoconvection.
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Citations
Citations to this article as recorded by - Thermal conductivity enhancement of ZnO nanofluid using a one-step physical method
Gyoung-Ja Lee, Chang Kyu Kim, Min Ku Lee, Chang Kyu Rhee, Seokwon Kim, Chongyoup Kim
Thermochimica Acta.2012; 542: 24. 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 - 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 - Synthesis and Characterization of (AgSbTe2)15(GeTe)85Thermoelectric Powder by Gas Atomization Process
Hyo-Seob Kim, Jin-Kyu Lee, Jar-Myung Koo, Byong-Sun Chun, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2011; 18(5): 449. CrossRef
- The Effect of Ti Powder addition on Compaction Behavior of TiO2 Nano Powder
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Jin-Sub Park, Hyo-Seob Kim, Ki-Seok Lee, Jeong-Goo Lee, Chang-Kyu Rhee, Soon-Jik Hong
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J Korean Powder Metall Inst. 2009;16(3):223-230.
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DOI: https://doi.org/10.4150/KPMI.2009.16.3.223
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15
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- The compaction response of TiO_2 nano powders with an addition of Ti powders prepared by magnetic pulsed compaction and subsequent sintering processes was investigated. All kinds of different bulk exhibited an average shrinkage of about 12% for different MPCed pressure and sintering temperature, which were approximately 50% lower than those fabricated by general process (20%) and a maximum density of around 92.7% was obtained for 0.8GPa MPCed pressure and 1400°C sintering temperature. The addition of Ti powder induced an increase in the formability and hardness of the sintered TiO_2. But the lower densities were obtained on sintering with addition of over 10 (wt%) Ti powder due to generation of crack during sintering. Subsequently it was verified that the optimum compaction pressure in MPC and sintering temperature were 0.8GPa and 1400°C, respectively.
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Citations
Citations to this article as recorded by - Fabrication of Ceramic Dental Block by Magnetic Pulsed Compaction
Hyo-Young Park, Hyo-Seob Kim, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 373. CrossRef
- Response Characteristics of Electrochemical Non-enzyme Immunosensor using Fe3O4 Nanoparticle
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Chang-Kyu Kim, Gyoung-Ja Lee, Young-Rang Uhm, Min-Ku Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2009;16(3):180-184.
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DOI: https://doi.org/10.4150/KPMI.2009.16.3.180
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- In this paper, the electrochemical non-enzyme immunosensor has been developed for the determination of salmonella antigen, using inverse voltammetry. For the estimation of salmonella antigen concentration, the Fe_3O_4 nanoparticles synthesized by microemulsion method were conjugated with salmonella antigen. Then, the immunocomplex between antibody immobilized on the transducer surface and antigen containing a magnetic nanoparticles was formed. From the linear relationship between the reduction peak current of Fe(III) and salmonella antigen concentration, it is suggested that the electrochemical non-enzyme biosensor is applicable to detect salmonella antigen in the concentration range of 101-105 CFU/ml.
- The Fabrication of PVA Polymer Coated on the Surface of B4C Nanocomposite by High Energy Ball Mill
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Young-Rang Uhm, Jae-Woo Kim, Jin-Woo Jung, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2009;16(2):110-114.
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DOI: https://doi.org/10.4150/KPMI.2009.16.2.110
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21
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- Mechanical coating process was applied to form 89 %-hydrolyzed poly vinyl alcohol (PVA) onto boron carbide (B_4C) nanopowder using one step high energy ball mill method. The polymer layer coated on the surface of B4C was changed to glass-like phase. The average particle size of core/shell structured B_4C/PVA was about 50 nm. The core/shell structured B_4C/PVA was formed by dry milling. However, the hydrolyzed PVA of 98sim99% with high glass transition temperature (T_g) was rarely coated on the powder. The T_g of polymer materials was one of keys for guest polymer coating on to the host powder by solvent free milling.
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Citations
Citations to this article as recorded by - Effect of Roasting Time and Cryogenic Milling on the Physicochemical Characteristics of Dried Ginseng Powder
Hayeong Jeong, Dong Hyeon Park, Han Geuk Seo, Mi-Jung Choi, Youngjae Cho
Foods.2020; 9(2): 223. CrossRef - The Effect of Milling Conditions for Dissolution Efficiency of Valuable Metals from PDP Waste Panels
Hyo-Seob Kim, Chan-Mi Kim, Chul-Hee Lee, Sung-Kyu Lee, Hyun-Seon Hong, Jar-Myung Koo, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 107. CrossRef - Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time
Hyo-Seob Kim, Jun-Je Sung, Cheol-Hee Lee, Hyun-Seon Hong, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 378. CrossRef - Refinement Behavior of Coarse Magnesium Powder by High Energy Ball Milling (HEBM)
Joon-Woo Song, Hyo-Seob Kim, Hong-Moule Kim, Taek-Soo Kim, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 302. CrossRef - Effect of Initial Silicon Scrap Size on Powder Refining Process During High Energy Ball Milling (HEBM)
Joon-Woo Song, Hyo-Seob Kim, Sung-Shin Kim, Jar-Myung Koo, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 242. CrossRef
- High Pressure Liquid Jet Technology for Nano Particles Production
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Marian Mazurkiewicz, Chang-Kyu Rhee, Bogumil Weglinski
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J Korean Powder Metall Inst. 2008;15(5):411-421.
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DOI: https://doi.org/10.4150/KPMI.2008.15.5.411
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- Principles and historical background of high pressure liquid jet (HPLJ) technology is presented in the paper. This technology can be applied, among others, for production of nano particles. This target can be achieved in various type of disintegration systems developed and designed on the base of this technology. The paper describes principles of two examples of such systems: HPLJ-reactor, called also a linear comminuting system, HPLJ- centrifugal comminuting system, which prototypes have been manufactured. A linear mill, being high energy liquid jet reactor, has been developed and tested for micronization of various types of materials. The results achieved so far, and presented in the paper, show its potential for further improvement toward nano-size particle production. Flexibility of adjustment of the reactors and the mechanism of the process allows for the creation of particles with unprecedented rheology. The reactor can be especially suitable to micronize, mix and densify materials with a wide range of mechanical properties for various industrial needs. Presented prototypes of comminution systems generate interesting potentials toward production of nano particles. Their performance, based on up today research, confirms expected high efficiency of materials disintegration, which opens a new challenge for industrial applications. The paper points out benefits and area of possible applications of presented technology.
- Magnetic Powder and Nano-powder Composites for Electrical Converters
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Marian Mazurkiewicz, Chang-Kyu Rhee, Bogumil Weglinski
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J Korean Powder Metall Inst. 2008;15(4):320-330.
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DOI: https://doi.org/10.4150/KPMI.2008.15.4.320
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- On the base of experience in development of Magnetic Powder Composites, and particularly Soft Magnetic Composites, authors are trying to systematize classification and indicate possible development prospective of Magnetic Nanocomposites (MN) technology and their applications in electrical converters. Clear classification and systematization, at an early stage of any materials and technology development, are essential and lead for better understanding and communication between researchers and industry involved. This concern MN as well and it seems to be the right time to make it at present stage of their development. Presented proposal of classification distinguishes various types of MN by their magnetic properties and area of possible applications. It is not a close set of types, and can be extended due to increase of knowledge concern these nanocomposites.
- Determination of Fractal Dimension and Surface Characterization of Metal Nano-powder Using Nitrogen Gas Adsorption Method
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Gyoung-Ja Lee, Young-Rang Uhm, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2007;14(6):391-398.
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DOI: https://doi.org/10.4150/KPMI.2007.14.6.391
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- The surface roughness of Al, Ag and Ni nano-powders which were prepared by pulsed wire evaporation method was quantified based upon the fractal theory. The surface fractal dimensions of metal nano-powders were determined from the linear relationship between In V/V_mono and Inln (Po/P) using multi-layer gas adsorption theory. Moreover, the fractal surface image was realized by computer simulation. The relationship between preparation condition and surface characteristics of metal nano-powders was discussed in detail.
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Citations
Citations to this article as recorded by - Electrophoretic deposition of Ni nanoparticles from suspension on to a Ni plate
Keun-Yong Park, Young Rang Uhm, Kwang Jae Son, Deok-Yong Park
Research on Chemical Intermediates.2015; 41(9): 6721. CrossRef
- Self-repairing Technology by Electrophoresis of Ni Nano-Particles for Heat Exchanger Tubes
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Gyoung-Ja Lee, Min-Ku Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2007;14(4):238-244.
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DOI: https://doi.org/10.4150/KPMI.2007.14.4.238
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19
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- The electrophoretic deposition process of Ni nano-particles in organic suspension was employed for self-repairing of heat exchanger tubes. For this purpose, Ni nano-particles prepared by levitational gas condensation method were dispersed into the solution of ethanol with the addition of dispersant Hypermer KD2. For electrophoretic deposition of Ni nano-particles on the Ni alloy specimen, constant electric fields of 20 and 100 V cm-1 were applied to the specimen in Ni-dispersed solution. It was found that as electrophoretic deposition proceeds, the size of the pit or crack remarkably decreased due to the agglomeration of Ni nano-particles at the pit or crack. This strongly suggests that the electrophoretic mobility of the charged particles is larger for the damaged part with a higher current value rather than outer surfaces with a lower current value.
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Citations
Citations to this article as recorded by - Electrophoretic deposition of Ni nanoparticles from suspension on to a Ni plate
Keun-Yong Park, Young Rang Uhm, Kwang Jae Son, Deok-Yong Park
Research on Chemical Intermediates.2015; 41(9): 6721. CrossRef
- Kinetic and Thermodynamic Features of Combustion of Superfine Aluminum Powders in Air
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Young-Soon Kwon, Pyuck-Pa Park, Ji-Soon Kim, Alexander Gromov, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2004;11(4):308-313.
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DOI: https://doi.org/10.4150/KPMI.2004.11.4.308
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- An experimental study on the combustion of superfine aluminum powders (average particle diameter, a_s: ∼0.1 µtextrmm) in air is reported. The formation of aluminum nitride during the combustion of aluminum in air and the influence of the combustion scenario on the structures and compositions of the final products are in the focus of this study. The experiments were conducted in an air (pressure: 1 atm). Superfine aluminum powders were produced by the wire electrical explosion method. Such superfine aluminum powder is stable in air but once ignited it can burn in a self-sustaining way due to its low bulk: density (∼0.1 g/㎤) and a low thermal conductivity. During combustion, the temperature and radiation were measured and the actual burning process was recorded by a video camera. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and chemical analysis were performed on the both initial powders and final products. It was found that the powders, ignited by local heating, burned in a two-stage self-propagating regime. The products of the first stage consisted of unreacted aluminum (-70 mass %) and amorphous oxides with traces of AlN. After the second stage the AlN content exceeded 50 mass % and the residual Al content decreased to ∼10 mass %. A qualitative discussion is given on the kinetic limitation for AlN oxidation due to rapid condensation and encapsulation of gaseous AlN.N.
- Characteristics of Nano-dispersed Powder by Electric Explosion of Conductors
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Young-Soon Kwon, Ji-Soon Kim, Jin-Soo Moon, Hwan-Tae Kim, Alexander-P Ilyin, Chang-Kyu Rhee, Geun-Hie Rim
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J Korean Powder Metall Inst. 2003;10(6):430-435.
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DOI: https://doi.org/10.4150/KPMI.2003.10.6.430
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- The phenomenon of electrical explosion of conductors is considered in the context of the changes in the energy and structural states of the metal at the stages of energy delivery and relaxation of the primary products of EEC. It is shown that these changes are related to the forced interaction of an intense energy flux with matter and to the subsequent spontaneous relaxation processes. The characteristics of nano-sized metal powders are also discussed. The preferential gas media during EEC is Ar+H_2. An increase in e/e_s (in the range of values studied) leads to a reduction in the metal content. For reactive powders obtained with high metal content, it is necessary to separate the SFAP fractions, which settled on the negative electrode of the electric filter.
- Synthesis and Compaction of Al-based Nanopowders by Pulsed Discharge Method
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Chang-Kyu Rhee, Geun-Hee Lee, Whung-Whoe Kim
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J Korean Powder Metall Inst. 2002;9(6):433-440.
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DOI: https://doi.org/10.4150/KPMI.2002.9.6.433
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- Synthesis and compaction of Al-base nano powders by pulsed discharge method were investigated. The aluminum based powders with 50 to 200 nm of diameter were produced by pulsed wire evaporation method. The powders were covered with very thin oxide layer. The perspective process for the compaction and sintering of nanostructured metal-based materials stable in a wide temperature range can be seen in the densification of nano-sized metal powders with uniformly distributed hard ceramic particles. The promising approach lies in utilization of natural uniform mixtures of metal and ceramic phases, e.g. partially oxidized metal powders as fabricated in our synthesis method. Their particles consist of metal grains coated with oxide films. To construct a metal-matrix material from such powder, it is necessary to destroy the hard oxide coatings of particles during the compaction process. This goal was realized in our experiments with intensive magnetic pulsed compaction of aluminum nanopowders passivated in air.
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Citations
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