Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Heat Treatment Atmosphere on the Microstructure of TiH2-MoO3 Powder Mixtures

열처리 분위기가 TiH2-MoO3 혼합분말의 미세조직 특성에 미치는 영향

  • Jeon, Ki Cheol (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Park, Sung Hyun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Kwon, Na-Yeon (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 전기철 (서울과학기술대학교 신소재공학과) ;
  • 박성현 (서울과학기술대학교 신소재공학과) ;
  • 권나연 (서울과학기술대학교 신소재공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과)
  • Received : 2016.07.28
  • Accepted : 2016.08.08
  • Published : 2016.08.28
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Abstract

An optimum route to synthesize Ti-Mo system powders is investigated by analyzing the effect of the heat treatment atmosphere on the formation of the reaction phase by dehydrogenation and hydrogen reduction of ball-milled $TiH_2-MoO_3$ powder mixtures. Homogeneous powder mixtures with refined particles are prepared by ball milling for 24 h. XRD analysis of the heat-treated powder in a hydrogen atmosphere shows $TiH_2$ and $MoO_3$ peaks in the initial powders as well as the peaks corresponding to the reaction phase species, such as $TiH_{0.7}$, TiO, $MoO_2$, Mo. In contrast, powder mixtures heated in an argon atmosphere are composed of Ti, TiO, Mo and $MoO_3$ phases. The formation of reaction phases dependent on the atmosphere is explained by the partial pressure of $H_2$ and the reaction temperature, based on thermodynamic considerations for the dehydrogenation reaction of $TiH_2$ and the reduction behavior of $MoO_3$.

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References

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