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Traditionally, WC-based composites use Co as the metal binder phase to consolidate using liquid-phase sintering with a small percentage of Co, but a potentially lower cost binder phase can be made with a different approach when using large amount of metal binder phase. FeNi as a metal binder material is much cheaper than Co. WC can be liquid-phase sintered and melt infiltrated with FeNi, but by making FeNi in situ, costs lower even further. Composites of WC-(Fe-Ni) were made by first pressing a mixture of WC and Fe powders and subsequently melt infiltrating Ni in an amount corresponding to less volume than the porosity of the preform to ensure high WC content. The research objective was to make highly dense composites via melt infiltration with a low-cost metal binder phase in situ. This method has the potential to make fully dense composites, rather than hardmetals, with suitable properties at lower costs. The density and hardness are 97.4%TD and 6.72 GPa, respectively. |
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