Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication of Nb-Si-B Alloys Using the Pulverized Nb-T2 Alloy Powder

Nb-T2 합금의 파쇄분말을 사용한 Nb-Si-B계 합금의 제조

  • Cho, Min-Ho (Department of Materials Science and Engineering, Kangwon National University) ;
  • Kim, Sung-Jun (Department of Materials Science and Engineering, Kangwon National University) ;
  • Kang, Hyun-Ji (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) ;
  • Kim, Young Do (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Seong (Agency for Defence Development) ;
  • Suk, Myung Jin (Department of Materials Science and Engineering, Kangwon National University)
  • 조민호 (강원대학교 신소재공학과) ;
  • 김성준 (강원대학교 신소재공학과) ;
  • 강현지 (서울과학기술대학교 신소재공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과) ;
  • 김영도 (한양대학교 신소재공학부) ;
  • 이성 (국방과학연구소) ;
  • 석명진 (강원대학교 신소재공학과)
  • Received : 2019.07.09
  • Accepted : 2019.08.06
  • Published : 2019.08.28
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Abstract

Nb-Si-B alloys with Nb-rich compositions are fabricated by spark plasma sintering for high-temperature structural applications. Three compositions are selected: 75 at% Nb (Nb0.7), 82 at% Nb (Nb1.5), and 88 at% Nb (Nb3), the atomic ratio of Si to B being 2. The microstructures of the prepared alloys are composed of Nb and $T_2$ phases. The $T_2$ phase is an intermetallic compound with a stoichiometry of $Nb_5Si_{3-x}B_x$ ($0{\leq}x{\leq}2$). In some previous studies, Nb-Si-B alloys have been prepared by spark plasma sintering (SPS) using Nb and $T_2$ powders (SPS 1). In the present work, the same alloys are prepared by the SPS process (SPS 2) using Nb powders and hypereutectic alloy powders with composition 67at%Nb-22at%Si-11at%B (Nb67). The Nb67 alloy powders comprise $T_2$ and eutectic ($T_2+Nb$) phases. The microstructures and hardness of the samples prepared in the present work have been compared with those previously reported; the samples prepared in this study exhibit finer and more uniform microstructures and higher hardness.

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References

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