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Hydrogenation Behavior of Sponge Titanium

스폰지 티타늄의 수소화 거동

  • Park, Ji-Hwan (Research Center, MTIG Ltd) ;
  • Lee, Dong-Won (Powder Technology Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Kim, Jong-Ryoul (Department of Metallurgical and Materials Engineering, Hanyang University)
  • 박지환 ((주)MTIG 기술연구소) ;
  • 이동원 (한국기계연구원 부설 재료연구소) ;
  • 김종렬 (한양대학교 금속재료공학과)
  • Received : 2010.08.13
  • Accepted : 2010.09.17
  • Published : 2010.10.28

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 $750^{\circ}C$ for 2 hrs leading to the formation of $TiH_{{\sim}1.99}$ and the treating temperatures lower or higher than $750^{\circ}C$ 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

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