Improvement in surface performance of Al3Ti+TiB2/(Ni coated WC) laser cladded coating with Al2O3/nano-Y2O3

AbstractAl3Ti+TiB2/(Ni coated WC) laser cladded coating on the Ti–6Al–4V alloy can increase microhardness and wear resistance of the substrate. Nevertheless, due to the actions of a large amount of M6C (Ni2W4C) and the coarse structure, the microhardness of this coating was only 2–3 times higher compared with the substrate. In this study, the Al3Ti+TiB2/(Ni coated WC)+Al2O3/nano-Y2O3 laser cladded coating has been researched by means of X-ray diffraction, scanning electron microscope and energy dispersive spectrometer. The experimental results indicated that with addition of the proper content of Al2O3/nano-Y2O3, the SiO2–Al2O3–Y2O3 system and the Al–Ni–Y amorphous alloy were produced, which were beneficial to increased microhardness and wear resistance of this coating. Furthermore, Al2O3/nano-Y2O3 can also decrease the M6C content, and refine the microstructure of this coating. Accordingly, the microhardness and wear resistance of the Al3Ti+TiB2/(Ni-coated WC) laser cladded coating have been greatly impr...