Journal of Powder Materials

[Korean]
The Effects of TiC Content on Microstructure of Modified A6013-3wt.%Si Alloy Powder Compact: Hyo-Sang Yoo, Yong-Ho Kim, Hyeon-Taek Son; J Powder Mater. 2022;29(1):28-33. Published online February 1, 2022; DOI: https://doi.org/10.4150/KPMI.2022.29.1.28

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Aluminum-based powders have attracted attention as key materials for 3D printing owing to their low density, high specific strength, high corrosion resistance, and formability. This study describes the effects of TiC addition on the microstructure of the A6013 alloy. The alloy powder was successfully prepared by gas atomization and further densified using an extrusion process. We have carried out energy dispersive X-ray spectrometry (EDS) and electron backscatter diffraction (EBSD) using scanning electron microscopy (SEM) in order to investigate the effect of TiC addition on the microstructure and texture evolution of the A6013 alloy. The atomized A6013-xTiC alloy powder is fine and spherical, with an initial powder size distribution of approximately 73 μm which decreases to 12.5, 13.9, 10.8, and 10.0 μm with increments in the amount of TiC.

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Influence of Curing Agent Amount on Properties of Dynamic Vulcanized Phenyl Silicone Rubber-SEBS-SBS System
Chunxu Zhao, Bobing He, Xian Chen
Polymers.2022; 14(24): 5443. CrossRef

[Korean]
Effect of Sn Addition on Microstructure of Al Alloy Powder for Brazing Process: Yong-Ho Kim, Hyo-Sang Yoo, Sang-Su Na, Hyeon-Taek Son; J Korean Powder Metall Inst. 2020;27(2):139-145. Published online April 1, 2020; DOI: https://doi.org/10.4150/KPMI.2020.27.2.139

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Abstract PDF: The powder manufacturing process using the gas atomizer process is easy for mass production, has a fine powder particle size, and has excellent mechanical properties compared to the existing casting process, so it can be applied to various industries such as automobiles, electronic devices, aviation, and 3D printers. In this study, a modified A4032-xSn (x = 0, 1, 3, 5, and 10 wt.%) alloy with low melting point properties is investigated. After maintaining an argon (Ar) gas atmosphere, the main crucible is tilted; containing molten metal at 1,000°C by melting the master alloy at a high frequency, and Ar gas is sprayed at 10 bar gas pressure after the molten metal inflow to the tundish crucible, which is maintained at 800°C. The manufactured powder is measured using a particle size analyzer, and FESEM is used to observe the shape and surface of the alloy powder. DSC is performed to investigate the change in shape, according to the melting point and temperature change. The microstructure of added tin (Sn) was observed by heat treatment at 575°C for 10 min. As the content of Sn increased, the volume fraction increased to 1.1, 3.1, 6.4, and 10.9%.

[Korean]
Sintering and Rolling Behavior of Cu-50In-13Ga Ternary Alloy Powder for Sputtering Target: Dae-Won Kim, Yong-Ho Kim, Jung-Han Kim, Dae-Guen Kim, Jong-Hyeon Lee, Kwang-Bo Choi, Hyeon-Taek Son; J Korean Powder Metall Inst. 2012;19(4):264-270.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.264

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In this study, we mainly focus on the study of densification of gas-atomized Cu-50 wt.%In-13 wt.%Ga alloy powder without occurrence of crack during the forming process. Cu-50 wt.%In-13 wt.%Ga alloy powder was consolidated by sintering and rolling processes in order to obtain high density. The phase and microstructure of formed materials were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical microscopy (OM), respectively. Warm rolling using copper can result in the improvement of density. The specimen obtained with 80% of rolling reduction ratio at 140°C using cooper can have the highest density of 8.039g/cm3.

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Synthesis and Properties of a Ge2Sb2Te5Sputtering for Use as a Target by Spark Plasma Sintering
C.W. Bang, K.B. Kim, J.K. Lee
Journal of Korean Powder Metallurgy Institute.2014; 21(2): 137. CrossRef

[Korean]
Effect of Ball milling Time on Graphite Dispersion and Mechanical Properties in Rapidly Solidified 6061 Al Composite: Hyeon-Taek Son, Jae-Seol Lee, Soon-Jik Hong, Byong-Sun Chun; J Korean Powder Metall Inst. 2009;16(3):209-216.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.209

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A composite of rapidly solidified Al-6061 alloy powder with graphite particle reinforcements was prepared by ball milling and subsequent hot extrusion. The microstructure and mechanical properties of these composites were investigated as a function of milling time. With increasing milling time, the gas atomized initially and spherical powders became elongated with a maximum aspect ratio after milling for 30 h. Then, refinement and spheroidization were achieved by further milling to 70 h with a homogeneous and fine dispersion of graphite particles forming between the matrix alloy layers. The best compression and wear properties were obtained in the powder milled for 70 h, associated with the increased fine and homogeneous distribution of graphite particles in the aluminum alloy matrix.

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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

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