High temperature frictional wear behaviors of
nano-particle reinforced NiCoCrAlY cladded coatings
nano-particle reinforced NiCoCrAlY cladded coatings
(1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;
2. College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. College of Mechanical and Electrical Engineering, Soochow University, Suzhou 215021, China)
2. College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. College of Mechanical and Electrical Engineering, Soochow University, Suzhou 215021, China)
Abstract: The NiCoCrAlY coatings strengthened by three nano-particles with the same addition were prepared on a Ni-base super alloy using laser cladding technique. The dry frictional wear behaviors of the coatings at 500 °C in static air were investigated. The comparison was made with the coating without nano-particles. The results show that the wear mechanism of the NiCoCrAlY coatings with nano-particles, like the coating without nano-particles, is the delamination wear due to the strong plastic deformation and oxidative wear. However, the frictional coefficient of the coatings increases and presents the decrease trend with the increase of sliding distance after adding nano-particles. Moreover, the wear rate of the coatings with nano-particles is only 34.0%−64.5% of the coating without nano-particles. Among the three nano-particles, the improvement of nano-SiC on the high temperature wear resistance of the coating is the most significant.
Key words: metal-matrix composite; frictional wear; NiCoCrAlY coating; nano-particles; laser cladding