Tribological properties of laser cladding TiB2 particles reinforced Ni-base alloy composite coatings on aluminum alloy

摘要: To improve the wear resistance of aluminum alloy frictional parts, TiB2 particles reinforced Ni-base composite coatings were prepared on 7005 by laser cladding. The microstructure and tribological properties investigated. results show that coating contains phases NiAl, Ni3Al, Al3Ni2, TiB2, TiB, TiC, CrB, Cr23C6. Its microhardness is HV0.5 855.8, which 15.4 % higher than 6.7 times as high alloy. friction coefficients are reduced 6.8 %–21.6 13.2 %–32.4 compared with those alloys, while losses 27.4 %–43.2 less only 16.5 %–32.7 alloys at different loads. At light loads ranging from 3 to 6 N, calculated maximum contact stress smaller elastic limit stress. mechanism micro-cutting wear, but changes into multi-plastic deformation 9 N due As increase 12 flash temperature rises 332.1 °C. experiences micro-brittle fracture oxidative wear.