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In this study, AlÀTiÀCo was used to improve the surface performance of pure Ti. Laser cladding is an important surface modi¯cation technique, which can be used to improve the surface performance of pure Ti. Laser cladding of the AlÀTiÀCo þ TiB 2 pre-placed powders on pure Ti can form ceramics reinforced the composite coating, which improved the wear resistance of the substrate. Characteristics of the composite coating were investigated using X-ray di®raction (XRD), scanning electron microscopy (SEM), microhardness and wear tests. And the laser-cladded coating can also have major dilution from the substrate. Due to the action of the¯ne grain strengthening and the phase constituent, the wear resistance and microhardness of pure Ti surface were greatly improved.

Laser cladding of the TiAl/Fe+Co-coated WC+TiB2 pre-placed mixed powders on a Ti-6Al-4V alloy substrate can be used to form TiB2/α-W2C-reinforced composite coating, which improved the wear resistance of the substrate. To further improve the TiB2/α-W2C-reinforced composite coating, yttria partially stabilized zirconia (YPSZ) was added into the pre-placed powders. A metallurgical bonding was formed between the YPSZ-infused composite coating and the substrate. Many amorphous alloys were produced in this composite coating due to the action of YPSZ, and such coating showed fine microstructure. Thus, it is feasible to further improve the wear resistance of the laser clad TiB2/α-W2C-reinforced composite coating through the addition of YPSZ.

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