Abstract:
Three different self-lubrication anti-wear composite coatings were fabricated on TA2 titanium alloy by laser cladding with different powder mixtures: 40%Ti–19.5%TiC–40.5%WS
2, 40%Ti–25.2%TiC–34.8%WS
2, 40%Ti–29.4%TiC–30.6%WS
2 (
w). The microstructure, phase compositions, microhardness and tribological properties of coatings were investigated systematically. The results have demonstrate that the microhardness of the three different coatings were HV
0.5 927.1, HV
0.5 1007.5 and HV
0.5 1052.3, respectively. The microhardness of coatings were improved dramatically compared with the TA2 titanium alloy (HV
0.5 180). The coefficient of friction and the wear rate of those coatings were 0.41 and 30.98×10
–5 mm
3/(N·m), 0.30 and 18.92×10
–5 mm
3/(N·m), 0.34 and 15.98×10
–5 mm
3/(N·m), respectively. The coating fabricated with the powder mixtures of 34.8% and 30.6% WS
2 presented excellent anti-wear and friction reduction properties. The main wear mechanism were mild plastic deformation and adhesive wear.