Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties

초미세 결정립을 가지는 몰리브덴의 제조 및 기계적 특성

  • Kim, Se-Hoon (Department of Materials Science and Engineering, Hanyang University) ;
  • Seo, Young-Ik (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Dae-Gun (Department of Materials Science and Engineering, Hanyang University) ;
  • Suk, Myung-Jin (Department of Materials & Metallurgical Engineering, Kangwon National University) ;
  • Kim, Young-Do (Department of Materials Science and Engineering, Hanyang University)
  • 김세훈 (한양대학교 신소재공학과) ;
  • 서영익 (한양대학교 신소재공학과) ;
  • 김대건 (한양대학교 신소재공학과) ;
  • 석명진 (강원대학교 재료금속공학과) ;
  • 김영도 (한양대학교 신소재공학과)
  • Received : 2010.05.10
  • Accepted : 2010.06.04
  • Published : 2010.06.28
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Abstract

Mo nanopowder was synthesized by ball-milling and subsequent hydrogen-reduction of $MoO_3$ powder. To fabricate ultra fine grained molybdenum, two-step sintering and spark plasma sintering process were employed. The grain size of specimen by two-step sintering and spark plasma sintering was around $0.6\;{\mu}m$ and $0.4\;{\mu}m$, respectively. Mechanical properties of ultra fine grained Mo with relative density of above 90% were significantly improved at room and high temperatures comparing to commercial bulk Mo of 99% relative density. This result was mainly explained by the grain size refinement due to diffusion-controlled sintering.

Keywords

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