Hydrogenation Behavior of Sponge Titanium

Ji-Hwan Park; Dong-Won Lee; Jong-Ryoul Kim

doi:10.4150/KPMI.2010.17.5.385

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스폰지 티타늄의 수소화 거동: 박지환, 이동원, 김종렬
Hydrogenation Behavior of Sponge Titanium: Ji-Hwan Park, Dong-Won Lee, Jong-Ryoul Kim; Journal of Korean Powder Metallurgy Institute 2010;17(5):385-389
DOI: https://doi.org/10.4150/KPMI.2010.17.5.385

¹(주)MTIG 기술연구소
²한국기계연구원 부설 재료연구소
³한양대학교 금속재료공학과
¹Research Center, MTIG Ltd
²Powder Technology Research Group, Korea Institute of Materials Science (KIMS)
³Department of Metallurgical and Materials Engineering, Hanyang University

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Abstract

Titanium powders have been usually produced by de-hydrogenating treatment in vacuum with titanium hydride (TiH_2) powders prepared by milling of hydrogenated sponge titanium, TiH_x. The higher stoichiometry of x in TiH_x, whose maximum value is 2, is achieved, crushing behavior is easier. TiH_x powder can be, therefore, easy to manufactured leading to obtain higher recovery factor of it. In addition, contamination of the powder can also minimized by the decrease of milling time. In this study, the hydrogenation behavior of sponge titanium was studied to find the maximum stoichiometry. The maximum stoichiometry in hydride formation of sponge titanium could be obtained at 750°C for 2 hrs leading to the formation of TiH_sim1.99 and the treating temperatures lower or higher than 750°C caused the poor stoichiometries by the low hydrogen diffusivity and un-stability of TiH_x, respectively. Such experimental behavior was compared with thermodynamically calculated one. The hydrogenated TiH_1.99 sponge was fully ball-milled under -325 Mesh and the purity of pure titanium powders obtained by de-hydrogenation was about 99.6%.

Keywords: Titanium;Powder;Hydride;De-hydride;

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