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http://dx.doi.org/10.4150/KPMI.2013.20.5.366

Effect of Added B4C on the Mechanical Properties of WC/Ni-Si Hardmetal  

Lee, Gil-Geun (Department of Materials System Engineering, Pukyong National University)
Ha, Gook-Hyun (Powder Technology Department, Korea Institute of Materials Science)
Publication Information
Journal of Powder Materials / v.20, no.5, 2013 , pp. 366-370 More about this Journal
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).
Keywords
Nickel base hardmetal; Boron carbide; Sintering; Mechanical property;
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