Journal of Powder Materials

Young-Hee Lee

2 Articles

Fabrication of Fe-TiC Composite Powder by High-Energy Milling and Subsequent Reaction Synthesis: Ki-Bong Ahn, Byung-Hun Lee, Young-Hee Lee, Hyunh Xuan Khoa, Ji-Soon Kim; J Korean Powder Metall Inst. 2013;20(1):53-59.; DOI: https://doi.org/10.4150/KPMI.2013.20.1.053

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Fe-TiC composite powder was fabricated via two steps. The first step was a high-energy milling of FeO and carbon powders followed by heat treatment for reduction to obtain a (Fe+C) powder mixture. The optimal condition for high-energy milling was 500 rpm for 1h, which had been determined by a series of preliminary experiment. Reduction heat-treatment was carried out at 900°C for 1h in flowing argon gas atmosphere. Reduced powder mixture was investigated by X-ray Diffraction (XRD), Field Emission-Scanning Electron Microscopy (FE-SEM) and Laser Particle Size Analyser (LPSA). The second step was a high-energy milling of (Fe+C) powder mixture and additional TiH_2 powder, and subsequent in-situ synthesis of TiC particulate in Fe matrix through a reaction of carbon and Ti. High-energy milling was carried out at 500 rpm for 1 h. Heat treatment for reaction synthesis was carried out at 1000sim1200°C for 1 h in flowing argon gas atmosphere. X-ray diffraction (XRD) results of the fabricated Fe-TiC composite powder showed that only TiC and Fe phases exist. Results from FE-SEM observation and Energy-Dispersive X-ray Spectros-copy (EDS) revealed that TiC phase exists uniformly dispersed in the Fe matrix in a form of particulate with a size of submicron.

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Plastic deformation and microstructural evolution during the shock consolidation of ultrafine copper powders
Dong-Hyun Ahn, Wooyeol Kim, Minju Kang, Lee Ju Park, Sunghak Lee, Hyoung Seop Kim
Materials Science and Engineering: A.2015; 625: 230. CrossRef
Spark Plasma Sintering of Fe-TiC Composite Powders
Yong-Heui Lee, Xuan-Khoa Hyunh, Ji Soon Kim
Journal of Korean Powder Metallurgy Institute.2014; 21(5): 382. CrossRef

The Densification Properties of Distaloy AE-TiC Cermet by Spark Plasma Sintering: Ho-Jung Cho, In-Shup Ahn, Young-Hee Lee, Dong-Kyu Park; J Korean Powder Metall Inst. 2007;14(4):230-237.; DOI: https://doi.org/10.4150/KPMI.2007.14.4.230

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Abstract PDF: The fabrication of Fe alloy-40 wt.%TiC composite materials using spark plasma sintering process after ball-milling was studied. Raw powders to fabricate Fe alloy-TiC composite were Fe alloy, TiH_2 and activated carbon. Fe alloy powder was Distaloy AE (4%Ni-1%Cu-0.5%Mo-0.01%C-bal.%Fe) made by Hoeganes company with better toughness and lower melting point. These powders were ball-milled in horizontal attrition ball mill at a ball-to-powder weight ratio of 30 : 1. After that, these mixture powders were sintered by using spark plasma sintering apparatus for 5 min at 1200-1275°C in vacuum atmosphere under 10-3 torr. DistaloyAE-40 wt.%TiC composite was directly synthesized by dehydrogenation and carburization reaction during sintering process. The phase transformation of as-milled powders and sintered materials was confirmed using X-ray diffraction (XRD) and transmission electron microscope (TEM). The density and harness materials was measured in order to confirm the densification behavior. In case of DistaloyAE-40 wt.%TiC composite retained for 5 min at 1275°C, it has the relative density of about 96% through the influence of rapid densification and fine TiC particle reinforced Fe-based composites materials.

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