Functionally graded cemented carbides of WC-TiC-Co with cubic rich surface

The WC-15%TiC-6%Co cemented carbides by mass were prepared by powder metallurgy, and the functionally graded cemented carbides of WC-TiC-Co with cubic rich surface were obtained by nitriding sintering in the control of nitrogen pressure, solid sintering temperature, and sintering time. The microstructures, phase constitution, and element distribution in graded zone of WC-TiC-Co alloys were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The results show that, the graded layer of WC-TiC-Co alloys with cubic rich surface has a thickness of more than 20 μm, which is rich in titanium and nitrogen as a form of cubic Ti(C_0.7, N_0.3) phase.