Papers by Keyword: Nano-TiC Powders

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Authors: Beom Seob Kim, Young Chul Woo, Deug Joong Kim
Abstract: Synthesis of nano TiC powder by carbothermal reduction procedure of TiO2 was investigated. TiO2 was mixed with resin or carbon powder as reduction agent and was reacted at 1500oC for 0 ~ 45 minutes under Ar atmosphere. Conglomeration of the powders mixed with TiO2 and resin were observed in the initial stage of the reduction and the unreacted TiO2 was not found even after 5 minutes elapsed. The fine TiC particles with a size of 80 nm were formed by complete reaction between Ti, a reduction product, and C after 15 minutes. However, the conglomerated particles were not the powders added with carbon powder as carbon source in the initial stage. The unreacted TiO2 particles were kept for 15 minutes. Finally, TiC particles were formed and were partially grown after 20 minutes.
Authors: Sung Yeal Bae, In Sup Ahn, Tek Kyung Sung, Dong Kyu Park
Abstract: Nano-TiC powders were fabricated for mechanical alloying (MA) by shaker mill using the TiH2 powders mixed carbon powder. For mechanical alloying, titanium hydride was easily breaking alloy and easily decomposed titanium particles and hydrogen gas. The decomposition titanium powders in TiH2 powders were very fine particle size and unstable phase. And it easily reacted to carbon ;(TiH2 + C 􀃆 TiC + H2). The effects of mechanical allyoing, morphology, phase and particle size were evaluated with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), TG/DTA and particle size analyzer. As-milled powders for 10 hours were successfully synthesized powders of TiC phase, mean particle 300nm size. And as-milled powder for 1 hour was included unstable phase, was annealed for 1 hour at 400°C-1300°C in 1x10-3torr vacuum atmosphere. Unstable phase was changed to recrystallize phase by heat treatment. After heat treatment for 1hour using as-milled powders, it was included many types of titanium oxide at temperature below 1000°C, was formed single phase of TiC at temperature over 1000°C.
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