Journal of Powder Materials

Dong-Kyu Park

2 Articles

Synthesis of Titanium Carbide Nano Particles by the Mechano Chemical Process: In-Shup Ahn, Dong-Kyu Park, Yong-Hee Lee; J Korean Powder Metall Inst. 2009;16(1):43-49.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.043

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Titanium carbides are widely used for cutting tools and grinding wheels, because of their superior physical properties such as high melting temperature, high hardness, high wear resistance, good thermal conductivity and excellent thermal shock resistance. The common synthesizing method for the titanium carbide powders is carbo-thermal reduction from the mixtures of titanium oxide(TiO_2) and carbon black. The purpose of the present research is to fabricate nano TiC powders using titanium salt and titanium hydride by the mechanochemical process(MCP). The initial elements used in this experiment are liquid TiCl_4(99.9%), TiH_2(99.9%) and active carbon(<32µm, 99.9%). Mg powders were added to the TiCl_4 solution in order to induce the reaction with Cl-. The weight ratios of the carbon and Mg powders were theoretically calculated. The TiC and MgCl_2 powders were milled in the planetary milling jar for 10 hours. The 40 nm TiC powders were fabricated by wet milling for 4 hours from the TiCl_4+C+Mg solution, and 300 nm TiC particles were obtained by using titanium hydride.

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Quantitative Study on the Refinement Behaviors of TiC Powders Produced by Mechanical Milling Under Different Impact Energy
Sung-Mo Hong, Eun-Kwang Park, Kyeong-Yeol Kim, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Jin-Kyu Lee, Young-Soon Kwon
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 32. 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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