- The Use of TiH2 to Refine Y2Ti2O7 in a Nano Mo-ODS Alloy
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Yuncheol Ha, Chun Woong Park, Won Hee Lee, Jongmin Byun, Young Do Kim
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J Powder Mater. 2024;31(5):399-405. Published online October 31, 2024
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DOI: https://doi.org/10.4150/jpm.2024.00178
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- Mo-ODS alloys have excellent mechanical properties, including an improved recrystallization temperature, greater strength due to dispersed oxides, and the ability to suppress grain growth at high temperatures. In ODS alloys, the dispersed Y2O3 and added Ti form Y-Ti-O complex oxides, producing finer particles than those in the initial Y2O3. The complex oxides increase high-temperature stability and improve the mechanical properties of the alloy. In particular, the use of TiH2 powder, which is more brittle than conventional Ti, can enable the distribution of finer oxides than is possible with conventional Ti powder during milling. Moreover, dehydrogenation leads to a more refined powder size in the reduction process. This study investigated the refinement of Y2Ti2O7 in a nano Mo-ODS alloy using TiH2. The alloy compositions were determined to be Mo-0.5Ti-0.5Y2O3 and Mo-1.0Ti-0.5Y2O3. The nano Mo-ODS alloys were fabricated using Ti and TiH2 to explore the effects of adding different forms of Ti. The sintered specimens were analyzed through X-ray diffraction for phase analysis, and the microstructure of the alloys was analyzed using scanning electron microscopy and transmission electron microscopy. Vickers hardness tests were conducted to determine the effect of the form of Ti added on the mechanical properties, and it was found that using TiH2 effectively improved the mechanical properties.
- Fabrication of Ti-Mo Core-shell Powder and Sintering Properties for Application as a Sputtering Target
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Won Hee Lee, Chun Woong Park, Heeyeon Kim, Yuncheol Ha, Jongmin Byun, Young Do Kim
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J Powder Mater. 2024;31(1):43-49. Published online February 28, 2024
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DOI: https://doi.org/10.4150/KPMI.2024.31.1.43
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- Alloy Design and Powder Manufacturing of Al-Cu-Si alloy for Low-Temperature Aluminum Brazing
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Heeyeon Kim, Chun Woong Park, Won Hee Lee, Young Do Kim
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J Powder Mater. 2023;30(4):339-345. Published online August 1, 2023
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DOI: https://doi.org/10.4150/KPMI.2023.30.4.339
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This study investigates the melting point and brazing properties of the aluminum (Al)-copper (Cu)-silicon (Si)-tin (Sn) alloy fabricated for low-temperature brazing based on the alloy design. Specifically, the Al-20Cu-10Si-Sn alloy is examined and confirmed to possess a melting point of approximately 520°C. Analysis of the melting point of the alloy based on composition reveals that the melting temperature tends to decrease with increasing Cu and Si content, along with a corresponding decrease as the Sn content rises. This study verifies that the Al-20Cu-10Si-5Sn alloy exhibits high liquidity and favorable mechanical properties for brazing through the joint gap filling test and Vickers hardness measurements. Additionally, a powder fabricated using the Al-20Cu-10Si-5Sn alloy demonstrates a melting point of around 515°C following melting point analysis. Consequently, it is deemed highly suitable for use as a low-temperature Al brazing material.
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