Simultaneous densification and phase decomposition of TiB2-WB2 solid solutions activated by cobalt boride addition
Abstract In order to apply simultaneous densification and phase decomposition of TiB 2 –WB 2 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)B 2 and (W,Ti)B 2 phases. Platelet crystals of the (W,Ti)B 2 phase were precipitated in grain boundary of the (Ti,W)B 2 phase. The mechanical properties of the product, which improved by the densification and decomposition of (Ti,W)B 2 , are also presented.