A SE SEM image of the powder feedstock, alongside a BSE SEM image of the powder cross sections are shown in Fig. 1. The particles of WC-Co are roughly spherical in shape, with an exterior covered in grains of WC. The mean carbide grain size was measured as approximately 3 μm. Cross sectional BSE images show the WC phase embedded in the Co binder phase with a darker contrast, alongside porosity visible inside the particles, typical of agglomerated and sintered powders. The NiCrFeSiB particles are the larger spherical grey particles, seen to be larger in size than the WC-Co particles. Cross sectional BSE SEM images indicated these particles are non-porous, with two distinct phases being visible; measurements from EDX point scans of these two phases are shown in Table 1. The spots with the darker contrast within the Ni phase particles were found to be Cr rich with Ni content falling from around 70.9 wt% in the surrounding areas to 29.5 wt% in the Cr rich regions.
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