Simultaneous densification and phase decomposition of TiB2–WB2 solid solutions activated by cobalt boride addition

In order to apply simultaneous densification and phase decomposition of TiB2–WB2 solid solutions occurred by pressureless sintering using induction heating, the effect of CoB as the additive agent have been investigated. The sintered products were evaluated using X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy analyses. Dense product with a relative density of 95%, which was produced with a CoB addition of 0.5 wt.% and an induction heating time for 600 s, was identified as (Ti,W)B2 and (W,Ti)B2 phases. Platelet crystals of the (W,Ti)B2 phase were precipitated in grain boundary of the (Ti,W)B2 phase. The mechanical properties of the product, which improved by the densification and decomposition of (Ti,W)B2, are also presented.