Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Added B4C on the Mechanical Properties of WC/Ni-Si Hardmetal

WC/Ni-Si 초경합금의 기계적 성질에 미치는 B4C의 영향

  • Lee, Gil-Geun (Department of Materials System Engineering, Pukyong National University) ;
  • Ha, Gook-Hyun (Powder Technology Department, Korea Institute of Materials Science)
  • 이길근 (부경대학교 신소재시스템공학과) ;
  • 하국현 (한국기계연구원부설재료연구소)
  • Received : 2013.09.13
  • Accepted : 2013.10.23
  • Published : 2013.10.28
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Abstract

The effects of $B_4C$ on the mechanical properties of WC/Ni-Si hardmetal were analyzed using sintered bodies comprising WC(70-x wt.%), Ni (28.5 wt.%), Si (1.5 wt.%), and $B_4C$ (x wt.%), where $$0{\leq_-}x{\leq_-}1.2$$ wt.%. Samples were prepared by a combination of mechanical milling and liquid-phase sintering. Phase and microstructure characterizations were conducted using X-ray diffractometry, scanning electron microscopy, and electron probe X-ray micro analysis. The mechanical properties of the sintered bodies were evaluated by measuring their hardness and transverse rupture strength. The addition of $B_4C$ improved the sinterability of the hardmetals. With increasing $B_4C$ content, their hardness increased, but their transverse rupture strength decreased. The changes of sinterability and mechanical properties were attributed to the alloying reaction between $B_4C$ and the binder metal (Ni, Si).

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